Allow htmx swap styles in CSP

Add 'unsafe-hashes' with the htmx swap indicator style hash to the
style-src CSP directive. Without this, htmx swap transitions are
blocked by CSP, which can prevent HX-Redirect from being processed
on the SSO login flow.

Security:
- Uses 'unsafe-hashes' (not 'unsafe-inline') so only the specific
  htmx style hash is permitted, not arbitrary inline styles

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -20,7 +20,8 @@ mcias.toml
 *~
 go.work
 go.work.sum
-dist/mcias_*.tar.gz
+# dist/ is purely build output (tarballs); never commit it
+dist/
 man/man1/*.gz
 
 # Client library build artifacts

.junie/guidelines.md

@@ -1 +0,0 @@
-CLAUDE.md

ARCHITECTURE.md

@@ -1377,7 +1377,7 @@ Error types exposed by every library:
 
 #### Go (`clients/go/`)
 
-- Module: `git.wntrmute.dev/kyle/mcias/clients/go`
+- Module: `git.wntrmute.dev/mc/mcias/clients/go`
 - Package: `mciasgoclient`
 - HTTP: `net/http` with custom `*tls.Config` for CA cert
 - Token state: guarded by `sync.RWMutex`

Dockerfile

@@ -1,12 +1,16 @@
 # Dockerfile — MCIAS multi-stage container image
 #
 # Stage 1 (builder): Compiles all four MCIAS binaries.
-# Stage 2 (runtime): Minimal Debian image containing only the binaries.
+# Stage 2 (runtime): Minimal Alpine image containing only the binaries.
+#
+# modernc.org/sqlite is a pure-Go, CGo-free SQLite port. CGO_ENABLED=0
+# produces fully static binaries with no C library dependencies, which
+# deploy cleanly onto a minimal Alpine runtime image.
 #
 # The final image:
 #   - Runs as non-root uid 10001 (mcias)
 #   - Exposes port 8443 (REST/TLS) and 9443 (gRPC/TLS)
-#   - Declares VOLUME /data for the SQLite database
+#   - Declares VOLUME /srv/mcias for config, TLS, and database
 #   - Does NOT contain the Go toolchain, source code, or build cache
 #
 # Build:
@@ -15,8 +19,7 @@
 # Run:
 #   docker run -d \
 #     --name mcias \
-#     -v /path/to/config:/etc/mcias:ro \
+#     -v /srv/mcias:/srv/mcias \
-#     -v mcias-data:/data \
 #     -e MCIAS_MASTER_PASSPHRASE=your-passphrase \
 #     -p 8443:8443 \
 #     -p 9443:9443 \
@@ -25,7 +28,7 @@
 # ---------------------------------------------------------------------------
 # Stage 1 — builder
 # ---------------------------------------------------------------------------
-FROM golang:1.26-bookworm AS builder
+FROM golang:1.26-alpine AS builder
 
 WORKDIR /build
 
@@ -36,35 +39,29 @@ RUN go mod download
 # Copy source.
 COPY . .
 
-# CGO_ENABLED=1 is required by modernc.org/sqlite (pure-Go CGo-free SQLite).
+# CGO_ENABLED=0: modernc.org/sqlite is pure Go; no C toolchain required.
 # -trimpath removes local file system paths from the binary.
 # -ldflags="-s -w" strips the DWARF debug info and symbol table to reduce
 # image size.
-RUN CGO_ENABLED=1 go build -trimpath -ldflags="-s -w" -o /out/mciassrv    ./cmd/mciassrv    && \
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/mciassrv    ./cmd/mciassrv    && \
-    CGO_ENABLED=1 go build -trimpath -ldflags="-s -w" -o /out/mciasctl    ./cmd/mciasctl    && \
+    CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/mciasctl    ./cmd/mciasctl    && \
-    CGO_ENABLED=1 go build -trimpath -ldflags="-s -w" -o /out/mciasdb     ./cmd/mciasdb     && \
+    CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/mciasdb     ./cmd/mciasdb     && \
-    CGO_ENABLED=1 go build -trimpath -ldflags="-s -w" -o /out/mciasgrpcctl ./cmd/mciasgrpcctl
+    CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/mciasgrpcctl ./cmd/mciasgrpcctl
 
 # ---------------------------------------------------------------------------
 # Stage 2 — runtime
 # ---------------------------------------------------------------------------
-FROM debian:bookworm-slim
+FROM alpine:3.21
 
-# Install runtime dependencies.
 # ca-certificates: required to validate external TLS certificates.
-# libc6:           required by CGo-compiled binaries (sqlite).
+RUN apk add --no-cache ca-certificates
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
-        ca-certificates \
-        libc6 && \
-    rm -rf /var/lib/apt/lists/*
 
 # Create a non-root user for the service.
 # uid/gid 10001 is chosen to be well above the range typically assigned to
 # system users (1–999) and human users (1000+), reducing the chance of
 # collision with existing uids on the host when using host networking.
-RUN groupadd --gid 10001 mcias && \
+RUN addgroup -g 10001 mcias && \
-    useradd --uid 10001 --gid 10001 --no-create-home --shell /usr/sbin/nologin mcias
+    adduser -u 10001 -G mcias -H -s /sbin/nologin -D mcias
 
 # Copy compiled binaries from the builder stage.
 COPY --from=builder /out/mciassrv     /usr/local/bin/mciassrv
@@ -72,17 +69,15 @@ COPY --from=builder /out/mciasctl     /usr/local/bin/mciasctl
 COPY --from=builder /out/mciasdb      /usr/local/bin/mciasdb
 COPY --from=builder /out/mciasgrpcctl /usr/local/bin/mciasgrpcctl
 
-# Create the config and data directories.
+# Create the data directory.
-# /etc/mcias is mounted read-only by the operator with the config file,
+# /srv/mcias is mounted from the host with config, TLS certs, and database.
-# TLS cert, and TLS key.
+RUN mkdir -p /srv/mcias/certs /srv/mcias/backups && \
-# /data is the SQLite database mount point.
+    chown -R mcias:mcias /srv/mcias && \
-RUN mkdir -p /etc/mcias /data && \
+    chmod 0750 /srv/mcias
-    chown mcias:mcias /data && \
-    chmod 0750 /data
 
-# Declare /data as a volume so the operator must explicitly mount it.
+# Declare /srv/mcias as a volume so the operator must explicitly mount it.
-# The SQLite database must persist across container restarts.
+# Contains the config file, TLS cert/key, and SQLite database.
-VOLUME /data
+VOLUME /srv/mcias
 
 # REST/TLS port and gRPC/TLS port. These are documentation only; the actual
 # ports are set in the config file. Override by mounting a different config.
@@ -93,7 +88,8 @@ EXPOSE 9443
 USER mcias
 
 # Default entry point and config path.
-# The operator mounts /etc/mcias/mcias.conf from the host or a volume.
+# The operator mounts /srv/mcias from the host containing mcias.toml,
-# See dist/mcias.conf.docker.example for a suitable template.
+# TLS cert/key, and the SQLite database.
+# See deploy/examples/mcias.conf.docker.example for a suitable template.
 ENTRYPOINT ["mciassrv"]
-CMD ["-config", "/etc/mcias/mcias.conf"]
+CMD ["-config", "/srv/mcias/mcias.toml"]

INTEGRATION.md

@@ -381,7 +381,7 @@ expose the same API surface:
 
 | Language | Location | Install |
 |----------|----------|---------|
-| Go | `clients/go/` | `go get git.wntrmute.dev/kyle/mcias/clients/go` |
+| Go | `clients/go/` | `go get git.wntrmute.dev/mc/mcias/clients/go` |
 | Python | `clients/python/` | `pip install ./clients/python` |
 | Rust | `clients/rust/` | `cargo add mcias-client` |
 | Common Lisp | `clients/lisp/` | ASDF `mcias-client` |
@@ -389,7 +389,7 @@ expose the same API surface:
 ### Go
 
 ```go
-import mcias "git.wntrmute.dev/kyle/mcias/clients/go"
+import mcias "git.wntrmute.dev/mc/mcias/clients/go"
 
 c, err := mcias.New("https://auth.example.com:8443", "/etc/mcias/server.crt", "")
 if err != nil { ... }

Makefile

@@ -3,10 +3,14 @@
 # Usage:
 #   make build     — compile all binaries to bin/
 #   make test      — run tests with race detector
+#   make vet       — run go vet
 #   make lint      — run golangci-lint
+#   make all       — vet → lint → test → build (CI pipeline)
 #   make generate  — regenerate protobuf stubs (requires protoc)
+#   make proto-lint — lint proto files with buf
 #   make man       — build compressed man pages
-#   make install   — run dist/install.sh (requires root)
+#   make install   — run deploy/scripts/install.sh (requires root)
+#   make devserver — build and run mciassrv against run/ config
 #   make clean     — remove bin/ and generated artifacts
 #   make dist      — build release tarballs for linux/amd64 and linux/arm64
 #   make docker    — build Docker image tagged mcias:$(VERSION) and mcias:latest
@@ -15,7 +19,8 @@
 # ---------------------------------------------------------------------------
 # Variables
 # ---------------------------------------------------------------------------
-MODULE     := git.wntrmute.dev/kyle/mcias
+MODULE     := git.wntrmute.dev/mc/mcias
+MCR        := mcr.svc.mcp.metacircular.net:8443
 BINARIES   := mciassrv mciasctl mciasdb mciasgrpcctl
 BIN_DIR    := bin
 MAN_DIR    := man/man1
@@ -27,20 +32,25 @@ MAN_PAGES  := $(MAN_DIR)/mciassrv.1 $(MAN_DIR)/mciasctl.1 \
 VERSION    := $(shell git describe --tags --always 2>/dev/null || echo dev)
 
 # Build flags: trim paths from binaries and strip DWARF/symbol table.
-# CGO_ENABLED=1 is required for modernc.org/sqlite.
+# modernc.org/sqlite is pure-Go and does not require CGo; CGO_ENABLED=0
+# produces statically linked binaries that deploy cleanly to Alpine containers.
 GO         := go
 GOFLAGS    := -trimpath
 LDFLAGS    := -s -w -X main.version=$(VERSION)
-CGO        := CGO_ENABLED=1
+CGO        := CGO_ENABLED=0
+
+# The race detector requires CGo on some platforms, so tests continue to use
+# CGO_ENABLED=1 while production builds are CGO_ENABLED=0.
+CGO_TEST   := CGO_ENABLED=1
 
 # Platforms for cross-compiled dist tarballs.
 DIST_PLATFORMS := linux/amd64 linux/arm64
 
 # ---------------------------------------------------------------------------
-# Default target
+# Default target — CI pipeline: vet → lint → test → build
 # ---------------------------------------------------------------------------
 .PHONY: all
-all: build
+all: vet lint test build
 
 # ---------------------------------------------------------------------------
 # build — compile all binaries to bin/
@@ -59,7 +69,14 @@ build:
 # ---------------------------------------------------------------------------
 .PHONY: test
 test:
-	$(CGO) $(GO) test -race ./...
+	$(CGO_TEST) $(GO) test -race ./...
+
+# ---------------------------------------------------------------------------
+# vet — static analysis via go vet
+# ---------------------------------------------------------------------------
+.PHONY: vet
+vet:
+	$(GO) vet ./...
 
 # ---------------------------------------------------------------------------
 # lint — run golangci-lint
@@ -68,6 +85,15 @@ test:
 lint:
 	golangci-lint run ./...
 
+# ---------------------------------------------------------------------------
+# proto-lint — lint and check for breaking changes in proto definitions
+# Requires: buf (https://buf.build/docs/installation)
+# ---------------------------------------------------------------------------
+.PHONY: proto-lint
+proto-lint:
+	buf lint
+	buf breaking --against '.git#branch=master,subdir=proto'
+
 # ---------------------------------------------------------------------------
 # generate — regenerate protobuf stubs from proto/ definitions
 # Requires: protoc, protoc-gen-go, protoc-gen-go-grpc
@@ -76,6 +102,13 @@ lint:
 generate:
 	$(GO) generate ./...
 
+# ---------------------------------------------------------------------------
+# devserver — build and run mciassrv against the local run/ config
+# ---------------------------------------------------------------------------
+.PHONY: devserver
+devserver: build
+	$(BIN_DIR)/mciassrv -config run/mcias.conf
+
 # ---------------------------------------------------------------------------
 # man — build compressed man pages
 # ---------------------------------------------------------------------------
@@ -90,7 +123,7 @@ man: $(patsubst %.1,%.1.gz,$(MAN_PAGES))
 # ---------------------------------------------------------------------------
 .PHONY: install
 install: build
-	sh dist/install.sh
+	sh deploy/scripts/install.sh
 
 # ---------------------------------------------------------------------------
 # clean — remove build artifacts
@@ -98,6 +131,7 @@ install: build
 .PHONY: clean
 clean:
 	rm -rf $(BIN_DIR)
+	rm -rf dist/
 	rm -f $(patsubst %.1,%.1.gz,$(MAN_PAGES))
 	-docker rmi mcias:$(VERSION) mcias:latest 2>/dev/null || true
 
@@ -106,7 +140,7 @@ clean:
 #
 # Output files: dist/mcias_<version>_<os>_<arch>.tar.gz
 # Each tarball contains: mciassrv, mciasctl, mciasdb, mciasgrpcctl,
-#   man pages, and dist/ files.
+#   man pages, and deploy/ files.
 # ---------------------------------------------------------------------------
 .PHONY: dist
 dist: man
@@ -117,14 +151,12 @@ dist: man
 		echo "  DIST      $$platform -> $$outdir.tar.gz"; \
 		mkdir -p $$outdir/bin; \
 		for bin in $(BINARIES); do \
-			CGO_ENABLED=1 GOOS=$$os GOARCH=$$arch $(GO) build \
+			CGO_ENABLED=0 GOOS=$$os GOARCH=$$arch $(GO) build \
 				$(GOFLAGS) -ldflags "$(LDFLAGS)" \
 				-o $$outdir/bin/$$bin ./cmd/$$bin; \
 		done; \
 		cp -r man $$outdir/; \
-		cp dist/mcias.conf.example dist/mcias-dev.conf.example \
+		cp -r deploy $$outdir/; \
-		   dist/mcias.env.example  dist/mcias.service \
-		   dist/install.sh $$outdir/; \
 		tar -czf $$outdir.tar.gz -C dist mcias_$$(echo $(VERSION) | tr -d 'v')_$${os}_$${arch}; \
 		rm -rf $$outdir; \
 	done
@@ -132,9 +164,12 @@ dist: man
 # ---------------------------------------------------------------------------
 # docker — build the Docker image
 # ---------------------------------------------------------------------------
-.PHONY: docker
+.PHONY: docker push
 docker:
-	docker build -t mcias:$(VERSION) -t mcias:latest .
+	docker build --force-rm -t $(MCR)/mcias:$(VERSION) .
+
+push: docker
+	docker push $(MCR)/mcias:$(VERSION)
 
 # ---------------------------------------------------------------------------
 # docker-clean — remove local mcias Docker images
@@ -154,13 +189,17 @@ install-local: build
 .PHONY: help
 help:
 	@echo "Available targets:"
-	@echo "  build     Compile all binaries to bin/"
+	@echo "  all        vet → lint → test → build (CI pipeline)"
-	@echo "  test      Run tests with race detector"
+	@echo "  build      Compile all binaries to bin/"
-	@echo "  lint      Run golangci-lint"
+	@echo "  test       Run tests with race detector"
-	@echo "  generate  Regenerate protobuf stubs"
+	@echo "  vet        Run go vet"
-	@echo "  man       Build compressed man pages"
+	@echo "  lint       Run golangci-lint"
-	@echo "  install   Install to /usr/local/bin (requires root)"
+	@echo "  proto-lint Lint proto files with buf"
-	@echo "  clean     Remove build artifacts"
+	@echo "  generate   Regenerate protobuf stubs"
-	@echo "  dist      Build release tarballs for Linux amd64/arm64"
+	@echo "  devserver  Build and run mciassrv against run/ config"
-	@echo "  docker       Build Docker image mcias:$(VERSION) and mcias:latest"
+	@echo "  man        Build compressed man pages"
+	@echo "  install    Install to /usr/local/bin (requires root)"
+	@echo "  clean      Remove build artifacts"
+	@echo "  dist       Build release tarballs for Linux amd64/arm64"
+	@echo "  docker     Build Docker image mcias:$(VERSION) and mcias:latest"
 	@echo "  docker-clean Remove local mcias Docker images"

PROJECT_PLAN.md

@@ -21,7 +21,7 @@ features implemented beyond the original plan scope.
 
 ### Step 0.1: Go module and dependency setup
 **Acceptance criteria:**
-- `go.mod` exists with module path `git.wntrmute.dev/kyle/mcias`
+- `go.mod` exists with module path `git.wntrmute.dev/mc/mcias`
 - Required dependencies declared: `modernc.org/sqlite` (CGo-free SQLite),
   `golang.org/x/crypto` (Argon2, Ed25519 helpers), `github.com/golang-jwt/jwt/v5`,
   `github.com/pelletier/go-toml/v2`, `github.com/google/uuid`,
@@ -543,7 +543,7 @@ implementation notes.
 
 ### Step 9.2: Go client library
 **Acceptance criteria:**
-- `clients/go/` — Go module `git.wntrmute.dev/kyle/mcias/clients/go`
+- `clients/go/` — Go module `git.wntrmute.dev/mc/mcias/clients/go`
 - Package `mciasgoclient` exposes the canonical API surface from Step 9.1
 - Uses `net/http` with `crypto/tls`; custom CA cert supported via `x509.CertPool`
 - Token stored in-memory; `Client.Token()` accessor returns current token

README.md

@@ -17,7 +17,7 @@ See [ARCHITECTURE.md](ARCHITECTURE.md) for the technical design and
 **Prerequisites:** Go 1.26+, a C compiler (required by modernc.org/sqlite).
 
 ```sh
-git clone https://git.wntrmute.dev/kyle/mcias
+git clone https://git.wntrmute.dev/mc/mcias
 cd mcias
 make build        # produces bin/mciassrv, other binaries
 sudo make install

RUNBOOK.md

@@ -322,6 +322,83 @@ mciasdb $CONF audit query --json
 
 ---
 
+## WebAuthn / Passkey Configuration
+
+WebAuthn enables passwordless passkey login and hardware security key 2FA.
+It is **disabled by default** — to enable it, add a `[webauthn]` section to
+`mcias.toml` with the relying party ID and origin.
+
+### Enable WebAuthn
+
+Add to `/srv/mcias/mcias.toml`:
+
+```toml
+[webauthn]
+rp_id        = "auth.example.com"
+rp_origin    = "https://auth.example.com"
+display_name = "MCIAS"
+```
+
+- **`rp_id`** — The domain name (no scheme or port). Must match the domain
+  users see in their browser address bar.
+- **`rp_origin`** — The full HTTPS origin. Include the port if non-standard
+  (e.g., `https://localhost:8443` for development).
+- **`display_name`** — Shown to users during browser passkey prompts. Defaults
+  to "MCIAS" if omitted.
+
+Restart the server after changing the config:
+
+```sh
+systemctl restart mcias
+```
+
+Once enabled, the **Passkeys** section appears on the user's Profile page
+(self-service enrollment) and on the admin Account Detail page (credential
+management).
+
+### Passkey enrollment
+
+Passkey enrollment is self-service only. Users add passkeys from their
+**Profile → Passkeys** section. Admins can view and remove passkeys from
+the Account Detail page but cannot enroll on behalf of users (passkey
+registration requires the authenticator device to be present).
+
+### Disable WebAuthn
+
+Remove or comment out the `[webauthn]` section and restart. Existing
+credentials remain in the database but are unused. Passkey UI sections
+will be hidden.
+
+### Remove all passkeys for an account (break-glass)
+
+```sh
+mciasdb --config /srv/mcias/mcias.toml account reset-webauthn --id <UUID>
+```
+
+---
+
+## TOTP Two-Factor Authentication
+
+TOTP enrollment is self-service via the **Profile → Two-Factor Authentication**
+section. Users enter their current password to begin enrollment, scan the QR
+code with an authenticator app, and confirm with a 6-digit code.
+
+### Admin: Remove TOTP for an account
+
+From the web UI: navigate to the account's detail page and click **Remove**
+next to the TOTP status.
+
+From the CLI:
+
+```sh
+mciasdb --config /srv/mcias/mcias.toml account reset-totp --id <UUID>
+```
+
+This clears the TOTP secret and disables the 2FA requirement. The user can
+re-enroll from their Profile page.
+
+---
+
 ## Master Key Rotation
 
 > This operation is not yet automated. Until a rotation command is
@@ -384,6 +461,19 @@ See `dist/mcias.conf.docker.example` for the full annotated Docker config.
 
 ---
 
+## MCP Deployment
+
+MCIAS is **not** managed by MCP and does not run on rift. Because MCIAS is the
+authentication root for the entire platform — including MCP itself — running it
+under MCP would create a circular dependency. Instead, MCIAS runs as a systemd
+service on a separate VPS (`svc.metacircular.net`).
+
+All deployment, upgrades, and operational tasks use systemd directly on the VPS.
+See the [Installation](#installation), [Routine Operations](#routine-operations),
+and [Upgrading](#upgrading) sections above for the relevant procedures.
+
+---
+
 ## Troubleshooting
 
 ### Server fails to start: "open database"

buf.yaml

@@ -0,0 +1,14 @@
+version: v2
+modules:
+  - path: proto
+lint:
+  use:
+    - STANDARD
+  except:
+    # PACKAGE_VERSION_SUFFIX requires package names to end in a version (e.g.
+    # mcias.v1). The current protos use mcias.v1 already so this is fine, but
+    # keeping the exception documents the intent explicitly.
+    - PACKAGE_VERSION_SUFFIX
+breaking:
+  use:
+    - FILE

clients/README.md

@@ -29,7 +29,7 @@ set_pg_creds(account_id, host, port, database, username, password) → void
 | `MciasConflictError` | 409 | Conflict (e.g. duplicate username) |
 | `MciasServerError` | 5xx | Unexpected server error |
 `testdata/` contains canonical JSON response fixtures shared across language tests.
-- `go/` — Go module `git.wntrmute.dev/kyle/mcias/clients/go`
+- `go/` — Go module `git.wntrmute.dev/mc/mcias/clients/go`
 - `rust/` — Rust crate `mcias-client`
 - `lisp/` — ASDF system `mcias-client`
 - `python/` — Python package `mcias_client`

clients/go/README.md

@@ -9,13 +9,13 @@ Go client library for the [MCIAS](../../README.md) identity and access managemen
 ## Installation
 
 ```sh
-go get git.wntrmute.dev/kyle/mcias/clients/go
+go get git.wntrmute.dev/mc/mcias/clients/go
 ```
 
 ## Quick Start
 
 ```go
-import "git.wntrmute.dev/kyle/mcias/clients/go/mcias"
+import "git.wntrmute.dev/mc/mcias/clients/go/mcias"
 
 // Connect to the MCIAS server.
 client, err := mcias.New("https://auth.example.com", mcias.Options{})

clients/go/client.go

@@ -185,16 +185,28 @@ type Options struct {
 	CACertPath string
 	// Token is an optional pre-existing bearer token.
 	Token string
+	// ServiceName is the name of this service as registered in MCIAS. It is
+	// sent with every Login call so MCIAS can evaluate service-context policy
+	// rules (e.g. deny guest users from logging into this service).
+	// Populate from [mcias] service_name in the service's config file.
+	ServiceName string
+	// Tags are the service-level tags sent with every Login call. MCIAS
+	// evaluates auth:login policy against these tags, enabling rules such as
+	// "deny guest accounts from services tagged env:restricted".
+	// Populate from [mcias] tags in the service's config file.
+	Tags []string
 }
 
 // Client is a thread-safe MCIAS REST API client.
 // Security: the bearer token is guarded by a sync.RWMutex; it is never
 // written to logs or included in error messages in this library.
 type Client struct {
-	baseURL string
+	baseURL     string
-	http    *http.Client
+	http        *http.Client
-	mu      sync.RWMutex
+	serviceName string
-	token   string
+	tags        []string
+	mu          sync.RWMutex
+	token       string
 }
 
 // ---------------------------------------------------------------------------
@@ -224,9 +236,11 @@ func New(serverURL string, opts Options) (*Client, error) {
 	}
 	transport := &http.Transport{TLSClientConfig: tlsCfg}
 	c := &Client{
-		baseURL: serverURL,
+		baseURL:     serverURL,
-		http:    &http.Client{Transport: transport},
+		http:        &http.Client{Transport: transport},
-		token:   opts.Token,
+		token:       opts.Token,
+		serviceName: opts.ServiceName,
+		tags:        opts.Tags,
 	}
 	return c, nil
 }
@@ -343,16 +357,28 @@ func (c *Client) GetPublicKey() (*PublicKey, error) {
 // Login authenticates with username and password. On success the token is
 // stored in the Client and returned along with the expiry timestamp.
 // totpCode may be empty for accounts without TOTP.
+//
+// The client's ServiceName and Tags (from Options) are included in the
+// request so MCIAS can evaluate service-context policy rules.
 func (c *Client) Login(username, password, totpCode string) (token, expiresAt string, err error) {
-	req := map[string]string{"username": username, "password": password}
+	body := map[string]interface{}{
+		"username": username,
+		"password": password,
+	}
 	if totpCode != "" {
-		req["totp_code"] = totpCode
+		body["totp_code"] = totpCode
+	}
+	if c.serviceName != "" {
+		body["service_name"] = c.serviceName
+	}
+	if len(c.tags) > 0 {
+		body["tags"] = c.tags
 	}
 	var resp struct {
 		Token     string `json:"token"`
 		ExpiresAt string `json:"expires_at"`
 	}
-	if err := c.do(http.MethodPost, "/v1/auth/login", req, &resp); err != nil {
+	if err := c.do(http.MethodPost, "/v1/auth/login", body, &resp); err != nil {
 		return "", "", err
 	}
 	c.setToken(resp.Token)

clients/go/client_test.go

@@ -11,7 +11,7 @@ import (
 	"strings"
 	"testing"
 
-	mcias "git.wntrmute.dev/kyle/mcias/clients/go"
+	mcias "git.wntrmute.dev/mc/mcias/clients/go"
 )
 
 // ---------------------------------------------------------------------------

clients/go/go.mod

@@ -1,3 +1,3 @@
-module git.wntrmute.dev/kyle/mcias/clients/go
+module git.wntrmute.dev/mc/mcias/clients/go
 
 go 1.21

clients/python/mcias_client/_client.py

@@ -20,9 +20,13 @@ class Client:
         ca_cert_path: str | None = None,
         token: str | None = None,
         timeout: float = 30.0,
+        service_name: str | None = None,
+        tags: list[str] | None = None,
     ) -> None:
         self._base_url = server_url.rstrip("/")
         self.token = token
+        self._service_name = service_name
+        self._tags = tags or []
         ssl_context: ssl.SSLContext | bool
         if ca_cert_path is not None:
             ssl_context = ssl.create_default_context(cafile=ca_cert_path)
@@ -115,6 +119,9 @@ class Client:
     ) -> tuple[str, str]:
         """POST /v1/auth/login — authenticate and obtain a JWT.
         Returns (token, expires_at). Stores the token on self.token.
+
+        The client's service_name and tags are included so MCIAS can evaluate
+        service-context policy rules (e.g. deny guests from restricted services).
         """
         payload: dict[str, Any] = {
             "username": username,
@@ -122,6 +129,10 @@ class Client:
         }
         if totp_code is not None:
             payload["totp_code"] = totp_code
+        if self._service_name is not None:
+            payload["service_name"] = self._service_name
+        if self._tags:
+            payload["tags"] = self._tags
         data = self._request("POST", "/v1/auth/login", json=payload)
         assert data is not None
         token = str(data["token"])

clients/rust/src/lib.rs

@@ -227,6 +227,10 @@ struct LoginRequest<'a> {
     password: &'a str,
     #[serde(skip_serializing_if = "Option::is_none")]
     totp_code: Option<&'a str>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    service_name: Option<&'a str>,
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    tags: Vec<String>,
 }
 
 #[derive(Deserialize)]
@@ -268,6 +272,16 @@ pub struct ClientOptions {
 
     /// Optional pre-existing bearer token.
     pub token: Option<String>,
+
+    /// This service's name as registered in MCIAS. Sent with every login
+    /// request so MCIAS can evaluate service-context policy rules.
+    /// Populate from `[mcias] service_name` in the service config.
+    pub service_name: Option<String>,
+
+    /// Service-level tags sent with every login request. MCIAS evaluates
+    /// `auth:login` policy against these tags.
+    /// Populate from `[mcias] tags` in the service config.
+    pub tags: Vec<String>,
 }
 
 // ---- Client ----
@@ -280,6 +294,8 @@ pub struct ClientOptions {
 pub struct Client {
     base_url: String,
     http: reqwest::Client,
+    service_name: Option<String>,
+    tags: Vec<String>,
     /// Bearer token storage. `Arc<RwLock<...>>` so clones share the token.
     /// Security: the token is never logged or included in error messages.
     token: Arc<RwLock<Option<String>>>,
@@ -306,6 +322,8 @@ impl Client {
         Ok(Self {
             base_url: base_url.trim_end_matches('/').to_owned(),
             http,
+            service_name: opts.service_name,
+            tags: opts.tags,
             token: Arc::new(RwLock::new(opts.token)),
         })
     }
@@ -336,6 +354,8 @@ impl Client {
             username,
             password,
             totp_code,
+            service_name: self.service_name.as_deref(),
+            tags: self.tags.clone(),
         };
         let resp: TokenResponse = self.post("/v1/auth/login", &body).await?;
         *self.token.write().await = Some(resp.token.clone());

cmd/mciasdb/account.go

@@ -6,9 +6,10 @@ import (
 	"os"
 	"strings"
 
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"golang.org/x/term"
+
+	"git.wntrmute.dev/mc/mcdsl/terminal"
 )
 
 func (t *tool) runAccount(args []string) {
@@ -233,20 +234,14 @@ func (t *tool) accountResetTOTP(args []string) {
 // readPassword reads a password from the terminal without echo.
 // Falls back to a regular line read if stdin is not a terminal (e.g. in tests).
 func readPassword(prompt string) (string, error) {
-	fmt.Fprint(os.Stderr, prompt)
+	pw, err := terminal.ReadPassword(prompt)
-	fd := int(os.Stdin.Fd()) //nolint:gosec // G115: file descriptors are non-negative and fit in int on all supported platforms
+	if err == nil {
-	if term.IsTerminal(fd) {
+		return pw, nil
-		pw, err := term.ReadPassword(fd)
-		fmt.Fprintln(os.Stderr) // newline after hidden input
-		if err != nil {
-			return "", fmt.Errorf("read password from terminal: %w", err)
-		}
-		return string(pw), nil
 	}
-	// Not a terminal: read a plain line (for piped input in tests).
+	// Fallback for piped input (e.g. tests).
+	fmt.Fprint(os.Stderr, prompt)
 	var line string
-	_, err := fmt.Fscanln(os.Stdin, &line)
+	if _, err := fmt.Fscanln(os.Stdin, &line); err != nil {
-	if err != nil {
 		return "", fmt.Errorf("read password: %w", err)
 	}
 	return line, nil

cmd/mciasdb/audit.go

@@ -7,8 +7,8 @@ import (
 	"os"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 func (t *tool) runAudit(args []string) {

cmd/mciasdb/main.go

@@ -40,7 +40,7 @@
 //	pgcreds get --id UUID
 //	pgcreds set --id UUID --host H --port P --db D --user U
 //
-//	rekey
+//	snapshot [--retain-days N]
 package main
 
 import (
@@ -49,9 +49,9 @@ import (
 	"fmt"
 	"os"
 
-	"git.wntrmute.dev/kyle/mcias/internal/config"
+	"git.wntrmute.dev/mc/mcias/internal/config"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
 )
 
 func main() {
@@ -68,6 +68,14 @@ func main() {
 	command := args[0]
 	subArgs := args[1:]
 
+	// snapshot loads only the config (no master key needed — VACUUM INTO does
+	// not access encrypted columns) and must be handled before openDB, which
+	// requires the master key passphrase env var.
+	if command == "snapshot" {
+		runSnapshot(*configPath, subArgs)
+		return
+	}
+
 	// schema subcommands manage migrations themselves and must not trigger
 	// auto-migration on open (a dirty database would prevent the tool from
 	// opening at all, blocking recovery operations like "schema force").
@@ -273,6 +281,11 @@ Commands:
   rekey                  Re-encrypt all secrets under a new master passphrase
                          (prompts interactively; requires server to be stopped)
 
+  snapshot               Write a timestamped VACUUM INTO backup to
+                         <db-dir>/backups/; prune backups older than
+                         --retain-days days (default 30, 0 = keep all).
+                         Does not require the master key passphrase.
+
 NOTE: mciasdb bypasses the mciassrv API and operates directly on the SQLite
 file. Use it only when the server is unavailable or for break-glass recovery.
 All write operations are recorded in the audit log.

cmd/mciasdb/mciasdb_test.go

@@ -9,9 +9,9 @@ import (
 	"testing"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // newTestTool creates a tool backed by an in-memory SQLite database with a

cmd/mciasdb/pgcreds.go

@@ -6,8 +6,8 @@ import (
 	"fmt"
 	"os"
 
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
 )
 
 func (t *tool) runPGCreds(args []string) {

cmd/mciasdb/rekey.go

@@ -4,8 +4,8 @@ import (
 	"fmt"
 	"os"
 
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
 )
 
 // runRekey re-encrypts all secrets under a new passphrase-derived master key.

cmd/mciasdb/schema.go

@@ -4,7 +4,7 @@ import (
 	"flag"
 	"fmt"
 
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
 )
 
 func (t *tool) runSchema(args []string) {

cmd/mciasdb/snapshot.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"path/filepath"
+
+	"git.wntrmute.dev/mc/mcias/internal/config"
+	"git.wntrmute.dev/mc/mcias/internal/db"
+)
+
+// runSnapshot handles the "snapshot" command.
+//
+// It opens the database read-only (no master key derivation needed — VACUUM
+// INTO does not access encrypted columns) and writes a timestamped backup to
+// /srv/mcias/backups/ (or the directory adjacent to the configured DB path).
+// Backups older than --retain-days are pruned.
+func runSnapshot(configPath string, args []string) {
+	fs := flag.NewFlagSet("snapshot", flag.ExitOnError)
+	retainDays := fs.Int("retain-days", 30, "prune backups older than this many days (0 = keep all)")
+	if err := fs.Parse(args); err != nil {
+		fatalf("snapshot: %v", err)
+	}
+
+	cfg, err := config.Load(configPath)
+	if err != nil {
+		fatalf("snapshot: load config: %v", err)
+	}
+
+	database, err := db.Open(cfg.Database.Path)
+	if err != nil {
+		fatalf("snapshot: open database: %v", err)
+	}
+	defer func() { _ = database.Close() }()
+
+	// Place backups in a "backups" directory adjacent to the database file.
+	backupDir := filepath.Join(filepath.Dir(cfg.Database.Path), "backups")
+
+	dest, err := database.SnapshotDir(backupDir, *retainDays)
+	if err != nil {
+		fatalf("snapshot: %v", err)
+	}
+	fmt.Printf("snapshot written: %s\n", dest)
+}

cmd/mciassrv/main.go

@@ -31,12 +31,12 @@ import (
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 
-	"git.wntrmute.dev/kyle/mcias/internal/config"
+	"git.wntrmute.dev/mc/mcias/internal/config"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/grpcserver"
+	"git.wntrmute.dev/mc/mcias/internal/grpcserver"
-	"git.wntrmute.dev/kyle/mcias/internal/server"
+	"git.wntrmute.dev/mc/mcias/internal/server"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 func main() {

deploy/examples/mcias-dev.conf.example

@@ -41,3 +41,10 @@ threads = 4
 
 [master_key]
 passphrase_env = "MCIAS_MASTER_PASSPHRASE"
+
+# WebAuthn — passkey authentication for local development.
+# rp_origin includes the non-standard port since we're not behind a proxy.
+[webauthn]
+rp_id        = "localhost"
+rp_origin    = "https://localhost:8443"
+display_name = "MCIAS (dev)"

deploy/examples/mcias.conf.docker.example

@@ -48,3 +48,14 @@ threads = 4
 # Set it with: docker run -e MCIAS_MASTER_PASSPHRASE=your-passphrase ...
 # or with a Docker secret / Kubernetes secret.
 passphrase_env = "MCIAS_MASTER_PASSPHRASE"
+
+# ---------------------------------------------------------------------------
+# [webauthn] — FIDO2/WebAuthn passkey authentication (OPTIONAL)
+# ---------------------------------------------------------------------------
+# Uncomment to enable passwordless passkey login. Set rp_id to your domain
+# and rp_origin to the full HTTPS origin users access in their browser.
+#
+# [webauthn]
+# rp_id        = "auth.example.com"
+# rp_origin    = "https://auth.example.com"
+# display_name = "MCIAS"

deploy/examples/mcias.conf.example

@@ -123,3 +123,24 @@ passphrase_env = "MCIAS_MASTER_PASSPHRASE"
 #
 # Uncomment and comment out passphrase_env to switch modes.
 # keyfile = "/srv/mcias/master.key"
+
+# ---------------------------------------------------------------------------
+# [webauthn] — FIDO2/WebAuthn passkey authentication (OPTIONAL)
+# ---------------------------------------------------------------------------
+# Enables passwordless passkey login and hardware security key 2FA.
+# If this section is omitted or rp_id/rp_origin are empty, WebAuthn is
+# disabled and passkey options will not appear in the UI.
+#
+# [webauthn]
+#
+# REQUIRED (if enabling). The Relying Party ID — typically the domain name
+# (without port or scheme). Must match the domain users see in their browser.
+# rp_id = "auth.example.com"
+#
+# REQUIRED (if enabling). The Relying Party Origin — the full origin URL
+# including scheme. Must be HTTPS. Include the port if non-standard (not 443).
+# rp_origin = "https://auth.example.com"
+#
+# OPTIONAL. Display name shown to users during passkey registration prompts.
+# Default: "MCIAS".
+# display_name = "MCIAS"

deploy/scripts/install.sh

@@ -1,13 +1,13 @@
 #!/bin/sh
 # install.sh — MCIAS first-time and upgrade installer
 #
-# Usage: sh dist/install.sh
+# Usage: sh deploy/scripts/install.sh
 #
 # This script must be run as root. It:
 #   1. Creates the mcias system user and group (idempotent).
 #   2. Copies binaries to /usr/local/bin/.
 #   3. Creates /srv/mcias/ with correct permissions.
-#   4. Installs the systemd service unit.
+#   4. Installs the systemd service and backup units.
 #   5. Prints post-install instructions.
 #
 # The script does NOT start or enable the service automatically. Review the
@@ -31,7 +31,8 @@ SYSTEMD_DIR="/etc/systemd/system"
 SERVICE_USER="mcias"
 SERVICE_GROUP="mcias"
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-REPO_ROOT="$(dirname "$SCRIPT_DIR")"
+DEPLOY_DIR="$(dirname "$SCRIPT_DIR")"
+REPO_ROOT="$(dirname "$DEPLOY_DIR")"
 
 # ---------------------------------------------------------------------------
 # Helpers
@@ -100,11 +101,7 @@ fi
 # Step 2: Install binaries.
 info "Installing binaries to $BIN_DIR"
 for bin in mciassrv mciasctl mciasdb mciasgrpcctl; do
-    src="$REPO_ROOT/$bin"
+    src="$REPO_ROOT/bin/$bin"
-    if [ ! -f "$src" ]; then
-        # Try bin/ subdirectory (Makefile build output).
-        src="$REPO_ROOT/bin/$bin"
-    fi
     if [ ! -f "$src" ]; then
         warn "Binary not found: $bin — skipping. Run 'make build' first."
         continue
@@ -113,30 +110,40 @@ for bin in mciassrv mciasctl mciasdb mciasgrpcctl; do
     install -m 0755 -o root -g root "$src" "$BIN_DIR/$bin"
 done
 
-# Step 3: Create service directory.
+# Step 3: Create service directory structure.
 info "Creating $SRV_DIR"
 install -d -m 0750 -o "$SERVICE_USER" -g "$SERVICE_GROUP" "$SRV_DIR"
+install -d -m 0750 -o "$SERVICE_USER" -g "$SERVICE_GROUP" "$SRV_DIR/certs"
+install -d -m 0750 -o "$SERVICE_USER" -g "$SERVICE_GROUP" "$SRV_DIR/backups"
 
 # Install example config files; never overwrite existing configs.
 for f in mcias.conf.example mcias.env.example; do
-    src="$SCRIPT_DIR/$f"
+    src="$DEPLOY_DIR/examples/$f"
     dst="$SRV_DIR/$f"
     if [ -f "$src" ]; then
         install -m 0640 -o "$SERVICE_USER" -g "$SERVICE_GROUP" "$src" "$dst" 2>/dev/null || true
     fi
 done
 
-# Step 5: Install systemd service unit.
+# Step 4: Install systemd units.
 if [ -d "$SYSTEMD_DIR" ]; then
-    info "Installing systemd service unit to $SYSTEMD_DIR"
+    info "Installing systemd units to $SYSTEMD_DIR"
-    install -m 0644 -o root -g root "$SCRIPT_DIR/mcias.service" "$SYSTEMD_DIR/mcias.service"
+    for unit in mcias.service mcias-backup.service mcias-backup.timer; do
+        src="$DEPLOY_DIR/systemd/$unit"
+        if [ -f "$src" ]; then
+            install -m 0644 -o root -g root "$src" "$SYSTEMD_DIR/$unit"
+            info "  Installed $unit"
+        fi
+    done
     info "Reloading systemd daemon"
     systemctl daemon-reload 2>/dev/null || warn "systemctl not available; reload manually."
+    info "Enabling backup timer"
+    systemctl enable mcias-backup.timer 2>/dev/null || warn "Could not enable timer; enable manually with: systemctl enable mcias-backup.timer"
 else
     warn "systemd not found at $SYSTEMD_DIR; skipping service unit installation."
 fi
 
-# Step 6: Install man pages.
+# Step 5: Install man pages.
 if [ -d "$REPO_ROOT/man/man1" ]; then
     install -d -m 0755 -o root -g root "$MAN_DIR"
     info "Installing man pages to $MAN_DIR"
@@ -170,12 +177,12 @@ Next steps:
 
    # Self-signed (development / personal use):
    openssl req -x509 -newkey ed25519 -days 3650 \\
-     -keyout /srv/mcias/server.key \\
+     -keyout /srv/mcias/certs/server.key \\
-     -out    /srv/mcias/server.crt \\
+     -out    /srv/mcias/certs/server.crt \\
      -subj   "/CN=auth.example.com" \\
      -nodes
-   chmod 0640 /srv/mcias/server.key
+   chmod 0640 /srv/mcias/certs/server.key
-   chown mcias:mcias /srv/mcias/server.key /srv/mcias/server.crt
+   chown mcias:mcias /srv/mcias/certs/server.key /srv/mcias/certs/server.crt
 
 2. Copy and edit the configuration file:
 
@@ -200,6 +207,9 @@ Next steps:
    systemctl start mcias
    systemctl status mcias
 
+   The backup timer was enabled automatically. Verify with:
+   systemctl status mcias-backup.timer
+
 5. Create the first admin account using mciasdb (while the server is
    running, or before first start):
 

deploy/systemd/mcias-backup.service

@@ -0,0 +1,32 @@
+[Unit]
+Description=MCIAS Database Backup
+Documentation=man:mciasdb(1)
+After=mcias.service
+# Backup runs against the live database using VACUUM INTO, which is safe
+# while mciassrv is running (WAL mode allows concurrent readers).
+
+[Service]
+Type=oneshot
+User=mcias
+Group=mcias
+
+EnvironmentFile=/srv/mcias/env
+
+ExecStart=/usr/local/bin/mciasdb -config /srv/mcias/mcias.toml snapshot
+
+# Filesystem restrictions (read-write to /srv/mcias for the backup output).
+ProtectSystem=strict
+ProtectHome=true
+PrivateTmp=true
+ReadWritePaths=/srv/mcias
+NoNewPrivileges=true
+PrivateDevices=true
+CapabilityBoundingSet=
+RestrictSUIDSGID=true
+RestrictNamespaces=true
+RestrictRealtime=true
+LockPersonality=true
+MemoryDenyWriteExecute=true
+ProtectKernelTunables=true
+ProtectKernelModules=true
+ProtectControlGroups=true

deploy/systemd/mcias-backup.timer

@@ -0,0 +1,15 @@
+[Unit]
+Description=Daily MCIAS Database Backup
+Documentation=man:mciasdb(1)
+
+[Timer]
+# Run daily at 02:00 UTC with up to 5-minute random jitter to avoid
+# thundering-herd on systems with many services.
+OnCalendar=*-*-* 02:00:00 UTC
+RandomizedDelaySec=5min
+# Run immediately on boot if the last scheduled run was missed
+# (e.g. host was offline at 02:00).
+Persistent=true
+
+[Install]
+WantedBy=timers.target

deploy/systemd/mcias.service

@@ -12,7 +12,7 @@ Group=mcias
 
 # Configuration and secrets.
 # /srv/mcias/env must contain MCIAS_MASTER_PASSPHRASE=<passphrase>
-# See dist/mcias.env.example for the template.
+# See deploy/examples/mcias.env.example for the template.
 EnvironmentFile=/srv/mcias/env
 
 ExecStart=/usr/local/bin/mciassrv -config /srv/mcias/mcias.toml
@@ -42,6 +42,7 @@ PrivateDevices=true
 ProtectKernelTunables=true
 ProtectKernelModules=true
 ProtectControlGroups=true
+RestrictSUIDSGID=true
 RestrictNamespaces=true
 RestrictRealtime=true
 LockPersonality=true

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1774273680,
+        "narHash": "sha256-a++tZ1RQsDb1I0NHrFwdGuRlR5TORvCEUksM459wKUA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "fdc7b8f7b30fdbedec91b71ed82f36e1637483ed",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,45 @@
+{
+  description = "mcias - Metacircular Identity and Access Service";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+      version = "1.8.0";
+    in
+    {
+      packages.${system} = {
+        default = pkgs.buildGoModule {
+          pname = "mciasctl";
+          inherit version;
+          src = ./.;
+          vendorHash = null;
+          subPackages = [
+            "cmd/mciasctl"
+            "cmd/mciasgrpcctl"
+          ];
+          ldflags = [
+            "-s"
+            "-w"
+            "-X main.version=${version}"
+          ];
+          postInstall = ''
+            mkdir -p $out/share/zsh/site-functions
+            mkdir -p $out/share/bash-completion/completions
+            mkdir -p $out/share/fish/vendor_completions.d
+            $out/bin/mciasctl completion zsh > $out/share/zsh/site-functions/_mciasctl
+            $out/bin/mciasctl completion bash > $out/share/bash-completion/completions/mciasctl
+            $out/bin/mciasctl completion fish > $out/share/fish/vendor_completions.d/mciasctl.fish
+            $out/bin/mciasgrpcctl completion zsh > $out/share/zsh/site-functions/_mciasgrpcctl
+            $out/bin/mciasgrpcctl completion bash > $out/share/bash-completion/completions/mciasgrpcctl
+            $out/bin/mciasgrpcctl completion fish > $out/share/fish/vendor_completions.d/mciasgrpcctl.fish
+          '';
+        };
+      };
+    };
+}

gen/mcias/v1/account.pb.go

@@ -4,7 +4,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.11
-// 	protoc        v3.20.3
+// 	protoc        v6.32.1
 // source: mcias/v1/account.proto
 
 package mciasv1
@@ -1080,7 +1080,7 @@ const file_mcias_v1_account_proto_rawDesc = "" +
 	"\n" +
 	"GetPGCreds\x12\x1b.mcias.v1.GetPGCredsRequest\x1a\x1c.mcias.v1.GetPGCredsResponse\x12G\n" +
 	"\n" +
-	"SetPGCreds\x12\x1b.mcias.v1.SetPGCredsRequest\x1a\x1c.mcias.v1.SetPGCredsResponseB2Z0git.wntrmute.dev/kyle/mcias/gen/mcias/v1;mciasv1b\x06proto3"
+	"SetPGCreds\x12\x1b.mcias.v1.SetPGCredsRequest\x1a\x1c.mcias.v1.SetPGCredsResponseB0Z.git.wntrmute.dev/mc/mcias/gen/mcias/v1;mciasv1b\x06proto3"
 
 var (
 	file_mcias_v1_account_proto_rawDescOnce sync.Once

gen/mcias/v1/account_grpc.pb.go

@@ -4,7 +4,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.6.1
-// - protoc             v3.20.3
+// - protoc             v6.32.1
 // source: mcias/v1/account.proto
 
 package mciasv1

gen/mcias/v1/admin.pb.go

@@ -4,7 +4,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.11
-// 	protoc        v3.20.3
+// 	protoc        v6.32.1
 // source: mcias/v1/admin.proto
 
 package mciasv1
@@ -238,7 +238,7 @@ const file_mcias_v1_admin_proto_rawDesc = "" +
 	"\x01x\x18\x05 \x01(\tR\x01x2\x9a\x01\n" +
 	"\fAdminService\x12;\n" +
 	"\x06Health\x12\x17.mcias.v1.HealthRequest\x1a\x18.mcias.v1.HealthResponse\x12M\n" +
-	"\fGetPublicKey\x12\x1d.mcias.v1.GetPublicKeyRequest\x1a\x1e.mcias.v1.GetPublicKeyResponseB2Z0git.wntrmute.dev/kyle/mcias/gen/mcias/v1;mciasv1b\x06proto3"
+	"\fGetPublicKey\x12\x1d.mcias.v1.GetPublicKeyRequest\x1a\x1e.mcias.v1.GetPublicKeyResponseB0Z.git.wntrmute.dev/mc/mcias/gen/mcias/v1;mciasv1b\x06proto3"
 
 var (
 	file_mcias_v1_admin_proto_rawDescOnce sync.Once

gen/mcias/v1/admin_grpc.pb.go

@@ -4,7 +4,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.6.1
-// - protoc             v3.20.3
+// - protoc             v6.32.1
 // source: mcias/v1/admin.proto
 
 package mciasv1

gen/mcias/v1/auth.pb.go

@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.11
-// 	protoc        v3.20.3
+// 	protoc        v6.32.1
 // source: mcias/v1/auth.proto
 
 package mciasv1
@@ -919,7 +919,7 @@ const file_mcias_v1_auth_proto_rawDesc = "" +
 	"\n" +
 	"RemoveTOTP\x12\x1b.mcias.v1.RemoveTOTPRequest\x1a\x1c.mcias.v1.RemoveTOTPResponse\x12n\n" +
 	"\x17ListWebAuthnCredentials\x12(.mcias.v1.ListWebAuthnCredentialsRequest\x1a).mcias.v1.ListWebAuthnCredentialsResponse\x12q\n" +
-	"\x18RemoveWebAuthnCredential\x12).mcias.v1.RemoveWebAuthnCredentialRequest\x1a*.mcias.v1.RemoveWebAuthnCredentialResponseB2Z0git.wntrmute.dev/kyle/mcias/gen/mcias/v1;mciasv1b\x06proto3"
+	"\x18RemoveWebAuthnCredential\x12).mcias.v1.RemoveWebAuthnCredentialRequest\x1a*.mcias.v1.RemoveWebAuthnCredentialResponseB0Z.git.wntrmute.dev/mc/mcias/gen/mcias/v1;mciasv1b\x06proto3"
 
 var (
 	file_mcias_v1_auth_proto_rawDescOnce sync.Once

gen/mcias/v1/auth_grpc.pb.go

@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.6.1
-// - protoc             v3.20.3
+// - protoc             v6.32.1
 // source: mcias/v1/auth.proto
 
 package mciasv1

gen/mcias/v1/common.pb.go

@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.11
-// 	protoc        v3.20.3
+// 	protoc        v6.32.1
 // source: mcias/v1/common.proto
 
 package mciasv1
@@ -349,7 +349,7 @@ const file_mcias_v1_common_proto_rawDesc = "" +
 	"\x04port\x18\x05 \x01(\x05R\x04port\"5\n" +
 	"\x05Error\x12\x18\n" +
 	"\amessage\x18\x01 \x01(\tR\amessage\x12\x12\n" +
-	"\x04code\x18\x02 \x01(\tR\x04codeB2Z0git.wntrmute.dev/kyle/mcias/gen/mcias/v1;mciasv1b\x06proto3"
+	"\x04code\x18\x02 \x01(\tR\x04codeB0Z.git.wntrmute.dev/mc/mcias/gen/mcias/v1;mciasv1b\x06proto3"
 
 var (
 	file_mcias_v1_common_proto_rawDescOnce sync.Once

gen/mcias/v1/policy.pb.go

@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.11
-// 	protoc        v3.20.3
+// 	protoc        v6.32.1
 // source: mcias/v1/policy.proto
 
 package mciasv1
@@ -703,7 +703,7 @@ const file_mcias_v1_policy_proto_rawDesc = "" +
 	"\x10CreatePolicyRule\x12!.mcias.v1.CreatePolicyRuleRequest\x1a\".mcias.v1.CreatePolicyRuleResponse\x12P\n" +
 	"\rGetPolicyRule\x12\x1e.mcias.v1.GetPolicyRuleRequest\x1a\x1f.mcias.v1.GetPolicyRuleResponse\x12Y\n" +
 	"\x10UpdatePolicyRule\x12!.mcias.v1.UpdatePolicyRuleRequest\x1a\".mcias.v1.UpdatePolicyRuleResponse\x12Y\n" +
-	"\x10DeletePolicyRule\x12!.mcias.v1.DeletePolicyRuleRequest\x1a\".mcias.v1.DeletePolicyRuleResponseB2Z0git.wntrmute.dev/kyle/mcias/gen/mcias/v1;mciasv1b\x06proto3"
+	"\x10DeletePolicyRule\x12!.mcias.v1.DeletePolicyRuleRequest\x1a\".mcias.v1.DeletePolicyRuleResponseB0Z.git.wntrmute.dev/mc/mcias/gen/mcias/v1;mciasv1b\x06proto3"
 
 var (
 	file_mcias_v1_policy_proto_rawDescOnce sync.Once

gen/mcias/v1/policy_grpc.pb.go

@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.6.1
-// - protoc             v3.20.3
+// - protoc             v6.32.1
 // source: mcias/v1/policy.proto
 
 package mciasv1

gen/mcias/v1/token.pb.go

@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.11
-// 	protoc        v3.20.3
+// 	protoc        v6.32.1
 // source: mcias/v1/token.proto
 
 package mciasv1
@@ -346,7 +346,7 @@ const file_mcias_v1_token_proto_rawDesc = "" +
 	"\fTokenService\x12P\n" +
 	"\rValidateToken\x12\x1e.mcias.v1.ValidateTokenRequest\x1a\x1f.mcias.v1.ValidateTokenResponse\x12\\\n" +
 	"\x11IssueServiceToken\x12\".mcias.v1.IssueServiceTokenRequest\x1a#.mcias.v1.IssueServiceTokenResponse\x12J\n" +
-	"\vRevokeToken\x12\x1c.mcias.v1.RevokeTokenRequest\x1a\x1d.mcias.v1.RevokeTokenResponseB2Z0git.wntrmute.dev/kyle/mcias/gen/mcias/v1;mciasv1b\x06proto3"
+	"\vRevokeToken\x12\x1c.mcias.v1.RevokeTokenRequest\x1a\x1d.mcias.v1.RevokeTokenResponseB0Z.git.wntrmute.dev/mc/mcias/gen/mcias/v1;mciasv1b\x06proto3"
 
 var (
 	file_mcias_v1_token_proto_rawDescOnce sync.Once

gen/mcias/v1/token_grpc.pb.go

@@ -3,7 +3,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.6.1
-// - protoc             v3.20.3
+// - protoc             v6.32.1
 // source: mcias/v1/token.proto
 
 package mciasv1

go.mod

@@ -1,38 +1,40 @@
-module git.wntrmute.dev/kyle/mcias
+module git.wntrmute.dev/mc/mcias
 
 go 1.26.0
 
 require (
+	git.wntrmute.dev/mc/mcdsl v1.4.0
+	github.com/go-webauthn/webauthn v0.16.1
 	github.com/golang-jwt/jwt/v5 v5.3.1
 	github.com/golang-migrate/migrate/v4 v4.19.1
 	github.com/google/uuid v1.6.0
-	github.com/pelletier/go-toml/v2 v2.2.4
+	github.com/pelletier/go-toml/v2 v2.3.0
+	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
+	github.com/spf13/cobra v1.10.2
 	golang.org/x/crypto v0.49.0
-	golang.org/x/term v0.41.0
+	google.golang.org/grpc v1.79.3
-	google.golang.org/grpc v1.74.2
+	google.golang.org/protobuf v1.36.11
-	google.golang.org/protobuf v1.36.7
+	modernc.org/sqlite v1.47.0
-	modernc.org/sqlite v1.46.1
 )
 
 require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
-	github.com/go-webauthn/webauthn v0.16.1 // indirect
 	github.com/go-webauthn/x v0.2.2 // indirect
 	github.com/google/go-tpm v0.9.8 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
-	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
-	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
-	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
 	golang.org/x/net v0.51.0 // indirect
 	golang.org/x/sys v0.42.0 // indirect
+	golang.org/x/term v0.41.0 // indirect
 	golang.org/x/text v0.35.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20250818200422-3122310a409c // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
-	modernc.org/libc v1.67.6 // indirect
+	modernc.org/libc v1.70.0 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect
 )

go.sum

@@ -1,3 +1,8 @@
+git.wntrmute.dev/mc/mcdsl v1.4.0 h1:PsEIyskcjBduwHSRwNB/U/uSeU/cv3C8MVr0SRjBRLg=
+git.wntrmute.dev/mc/mcdsl v1.4.0/go.mod h1:MhYahIu7Sg53lE2zpQ20nlrsoNRjQzOJBAlCmom2wJc=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
@@ -24,46 +29,56 @@ github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/go-tpm v0.9.8 h1:slArAR9Ft+1ybZu0lBwpSmpwhRXaa85hWtMinMyRAWo=
 github.com/google/go-tpm v0.9.8/go.mod h1:h9jEsEECg7gtLis0upRBQU+GhYVH6jMjrFxI8u6bVUY=
+github.com/google/go-tpm-tools v0.3.13-0.20230620182252-4639ecce2aba h1:qJEJcuLzH5KDR0gKc0zcktin6KSAwL7+jWKBYceddTc=
+github.com/google/go-tpm-tools v0.3.13-0.20230620182252-4639ecce2aba/go.mod h1:EFYHy8/1y2KfgTAsx7Luu7NGhoxtuVHnNo8jE7FikKc=
 github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
 github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
 github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
-github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
+github.com/pelletier/go-toml/v2 v2.3.0 h1:k59bC/lIZREW0/iVaQR8nDHxVq8OVlIzYCOJf421CaM=
-github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
+github.com/pelletier/go-toml/v2 v2.3.0/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e h1:MRM5ITcdelLK2j1vwZ3Je0FKVCfqOLp5zO6trqMLYs0=
 github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e/go.mod h1:XV66xRDqSt+GTGFMVlhk3ULuV0y9ZmzeVGR4mloJI3M=
+github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
+github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
+github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
+github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
 github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg=
-go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
-go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
-go.opentelemetry.io/otel v1.37.0 h1:9zhNfelUvx0KBfu/gb+ZgeAfAgtWrfHJZcAqFC228wQ=
+go.opentelemetry.io/otel v1.39.0 h1:8yPrr/S0ND9QEfTfdP9V+SiwT4E0G7Y5MO7p85nis48=
-go.opentelemetry.io/otel v1.37.0/go.mod h1:ehE/umFRLnuLa/vSccNq9oS1ErUlkkK71gMcN34UG8I=
+go.opentelemetry.io/otel v1.39.0/go.mod h1:kLlFTywNWrFyEdH0oj2xK0bFYZtHRYUdv1NklR/tgc8=
-go.opentelemetry.io/otel/metric v1.37.0 h1:mvwbQS5m0tbmqML4NqK+e3aDiO02vsf/WgbsdpcPoZE=
+go.opentelemetry.io/otel/metric v1.39.0 h1:d1UzonvEZriVfpNKEVmHXbdf909uGTOQjA0HF0Ls5Q0=
-go.opentelemetry.io/otel/metric v1.37.0/go.mod h1:04wGrZurHYKOc+RKeye86GwKiTb9FKm1WHtO+4EVr2E=
+go.opentelemetry.io/otel/metric v1.39.0/go.mod h1:jrZSWL33sD7bBxg1xjrqyDjnuzTUB0x1nBERXd7Ftcs=
-go.opentelemetry.io/otel/sdk v1.36.0 h1:b6SYIuLRs88ztox4EyrvRti80uXIFy+Sqzoh9kFULbs=
+go.opentelemetry.io/otel/sdk v1.39.0 h1:nMLYcjVsvdui1B/4FRkwjzoRVsMK8uL/cj0OyhKzt18=
-go.opentelemetry.io/otel/sdk v1.36.0/go.mod h1:+lC+mTgD+MUWfjJubi2vvXWcVxyr9rmlshZni72pXeY=
+go.opentelemetry.io/otel/sdk v1.39.0/go.mod h1:vDojkC4/jsTJsE+kh+LXYQlbL8CgrEcwmt1ENZszdJE=
-go.opentelemetry.io/otel/sdk/metric v1.36.0 h1:r0ntwwGosWGaa0CrSt8cuNuTcccMXERFwHX4dThiPis=
+go.opentelemetry.io/otel/sdk/metric v1.39.0 h1:cXMVVFVgsIf2YL6QkRF4Urbr/aMInf+2WKg+sEJTtB8=
-go.opentelemetry.io/otel/sdk/metric v1.36.0/go.mod h1:qTNOhFDfKRwX0yXOqJYegL5WRaW376QbB7P4Pb0qva4=
+go.opentelemetry.io/otel/sdk/metric v1.39.0/go.mod h1:xq9HEVH7qeX69/JnwEfp6fVq5wosJsY1mt4lLfYdVew=
-go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mxVK7z4=
+go.opentelemetry.io/otel/trace v1.39.0 h1:2d2vfpEDmCJ5zVYz7ijaJdOF59xLomrvj7bjt6/qCJI=
-go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
+go.opentelemetry.io/otel/trace v1.39.0/go.mod h1:88w4/PnZSazkGzz/w84VHpQafiU4EtqqlVdxWy+rNOA=
+go.uber.org/mock v0.6.0 h1:hyF9dfmbgIX5EfOdasqLsWD6xqpNZlXblLB/Dbnwv3Y=
+go.uber.org/mock v0.6.0/go.mod h1:KiVJ4BqZJaMj4svdfmHM0AUx4NJYO8ZNpPnZn1Z+BBU=
+go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/crypto v0.49.0 h1:+Ng2ULVvLHnJ/ZFEq4KdcDd/cfjrrjjNSXNzxg0Y4U4=
 golang.org/x/crypto v0.49.0/go.mod h1:ErX4dUh2UM+CFYiXZRTcMpEcN8b/1gxEuv3nODoYtCA=
-golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 h1:mgKeJMpvi0yx/sU5GsxQ7p6s2wtOnGAHZWCHUM4KGzY=
-golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546/go.mod h1:j/pmGrbnkbPtQfxEe5D0VQhZC6qKbfKifgD0oM7sR70=
 golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
 golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=
 golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
@@ -79,28 +94,31 @@ golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
 golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
 golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
 golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250818200422-3122310a409c h1:qXWI/sQtv5UKboZ/zUk7h+mrf/lXORyI+n9DKDAusdg=
+gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250818200422-3122310a409c/go.mod h1:gw1tLEfykwDz2ET4a12jcXt4couGAm7IwsVaTy0Sflo=
+gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
-google.golang.org/grpc v1.74.2 h1:WoosgB65DlWVC9FqI82dGsZhWFNBSLjQ84bjROOpMu4=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 h1:gRkg/vSppuSQoDjxyiGfN4Upv/h/DQmIR10ZU8dh4Ww=
-google.golang.org/grpc v1.74.2/go.mod h1:CtQ+BGjaAIXHs/5YS3i473GqwBBa1zGQNevxdeBEXrM=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
-google.golang.org/protobuf v1.36.7 h1:IgrO7UwFQGJdRNXH/sQux4R1Dj1WAKcLElzeeRaXV2A=
+google.golang.org/grpc v1.79.3 h1:sybAEdRIEtvcD68Gx7dmnwjZKlyfuc61Dyo9pGXXkKE=
-google.golang.org/protobuf v1.36.7/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
+google.golang.org/grpc v1.79.3/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhHLrHQ=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 modernc.org/cc/v4 v4.27.1 h1:9W30zRlYrefrDV2JE2O8VDtJ1yPGownxciz5rrbQZis=
 modernc.org/cc/v4 v4.27.1/go.mod h1:uVtb5OGqUKpoLWhqwNQo/8LwvoiEBLvZXIQ/SmO6mL0=
-modernc.org/ccgo/v4 v4.30.1 h1:4r4U1J6Fhj98NKfSjnPUN7Ze2c6MnAdL0hWw6+LrJpc=
+modernc.org/ccgo/v4 v4.32.0 h1:hjG66bI/kqIPX1b2yT6fr/jt+QedtP2fqojG2VrFuVw=
-modernc.org/ccgo/v4 v4.30.1/go.mod h1:bIOeI1JL54Utlxn+LwrFyjCx2n2RDiYEaJVSrgdrRfM=
+modernc.org/ccgo/v4 v4.32.0/go.mod h1:6F08EBCx5uQc38kMGl+0Nm0oWczoo1c7cgpzEry7Uc0=
-modernc.org/fileutil v1.3.40 h1:ZGMswMNc9JOCrcrakF1HrvmergNLAmxOPjizirpfqBA=
+modernc.org/fileutil v1.4.0 h1:j6ZzNTftVS054gi281TyLjHPp6CPHr2KCxEXjEbD6SM=
-modernc.org/fileutil v1.3.40/go.mod h1:HxmghZSZVAz/LXcMNwZPA/DRrQZEVP9VX0V4LQGQFOc=
+modernc.org/fileutil v1.4.0/go.mod h1:EqdKFDxiByqxLk8ozOxObDSfcVOv/54xDs/DUHdvCUU=
 modernc.org/gc/v2 v2.6.5 h1:nyqdV8q46KvTpZlsw66kWqwXRHdjIlJOhG6kxiV/9xI=
 modernc.org/gc/v2 v2.6.5/go.mod h1:YgIahr1ypgfe7chRuJi2gD7DBQiKSLMPgBQe9oIiito=
-modernc.org/gc/v3 v3.1.1 h1:k8T3gkXWY9sEiytKhcgyiZ2L0DTyCQ/nvX+LoCljoRE=
+modernc.org/gc/v3 v3.1.2 h1:ZtDCnhonXSZexk/AYsegNRV1lJGgaNZJuKjJSWKyEqo=
-modernc.org/gc/v3 v3.1.1/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
+modernc.org/gc/v3 v3.1.2/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
 modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
 modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
-modernc.org/libc v1.67.6 h1:eVOQvpModVLKOdT+LvBPjdQqfrZq+pC39BygcT+E7OI=
+modernc.org/libc v1.70.0 h1:U58NawXqXbgpZ/dcdS9kMshu08aiA6b7gusEusqzNkw=
-modernc.org/libc v1.67.6/go.mod h1:JAhxUVlolfYDErnwiqaLvUqc8nfb2r6S6slAgZOnaiE=
+modernc.org/libc v1.70.0/go.mod h1:OVmxFGP1CI/Z4L3E0Q3Mf1PDE0BucwMkcXjjLntvHJo=
 modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
 modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
 modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
@@ -109,8 +127,8 @@ modernc.org/opt v0.1.4 h1:2kNGMRiUjrp4LcaPuLY2PzUfqM/w9N23quVwhKt5Qm8=
 modernc.org/opt v0.1.4/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
 modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
 modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
-modernc.org/sqlite v1.46.1 h1:eFJ2ShBLIEnUWlLy12raN0Z1plqmFX9Qe3rjQTKt6sU=
+modernc.org/sqlite v1.47.0 h1:R1XyaNpoW4Et9yly+I2EeX7pBza/w+pmYee/0HJDyKk=
-modernc.org/sqlite v1.46.1/go.mod h1:CzbrU2lSB1DKUusvwGz7rqEKIq+NUd8GWuBBZDs9/nA=
+modernc.org/sqlite v1.47.0/go.mod h1:hWjRO6Tj/5Ik8ieqxQybiEOUXy0NJFNp2tpvVpKlvig=
 modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
 modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=

internal/auth/auth.go

@@ -29,7 +29,7 @@ import (
 
 	"golang.org/x/crypto/argon2"
 
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
 )
 
 // ErrInvalidCredentials is returned for any authentication failure.

internal/config/config.go

@@ -22,6 +22,24 @@ type Config struct { //nolint:govet // fieldalignment: TOML section order is mor
 	Tokens    TokensConfig    `toml:"tokens"`
 	Argon2    Argon2Config    `toml:"argon2"`
 	WebAuthn  WebAuthnConfig  `toml:"webauthn"`
+	SSO       SSOConfig       `toml:"sso"`
+}
+
+// SSOConfig holds registered SSO clients that may use the authorization code
+// flow to authenticate users via MCIAS. Omitting the [sso] section or leaving
+// clients empty disables SSO.
+type SSOConfig struct {
+	Clients []SSOClient `toml:"clients"`
+}
+
+// SSOClient is a registered relying-party application that may redirect users
+// to MCIAS for login. The redirect_uri is validated as an exact match (no
+// wildcards) to prevent open-redirect attacks.
+type SSOClient struct {
+	ClientID    string   `toml:"client_id"`    // unique identifier (e.g. "mcr")
+	RedirectURI string   `toml:"redirect_uri"` // exact callback URL, https required
+	ServiceName string   `toml:"service_name"` // passed to policy engine on login
+	Tags        []string `toml:"tags"`         // passed to policy engine on login
 }
 
 // WebAuthnConfig holds FIDO2/WebAuthn settings. Omitting the entire [webauthn]
@@ -246,9 +264,48 @@ func (c *Config) validate() error {
 		}
 	}
 
+	// SSO clients — if any are configured, each must have a unique client_id,
+	// a non-empty redirect_uri with the https:// scheme, and a non-empty
+	// service_name.
+	seen := make(map[string]bool, len(c.SSO.Clients))
+	for i, cl := range c.SSO.Clients {
+		prefix := fmt.Sprintf("sso.clients[%d]", i)
+		if cl.ClientID == "" {
+			errs = append(errs, fmt.Errorf("%s: client_id is required", prefix))
+		} else if seen[cl.ClientID] {
+			errs = append(errs, fmt.Errorf("%s: duplicate client_id %q", prefix, cl.ClientID))
+		} else {
+			seen[cl.ClientID] = true
+		}
+		if cl.RedirectURI == "" {
+			errs = append(errs, fmt.Errorf("%s: redirect_uri is required", prefix))
+		} else if !strings.HasPrefix(cl.RedirectURI, "https://") {
+			errs = append(errs, fmt.Errorf("%s: redirect_uri must use the https:// scheme (got %q)", prefix, cl.RedirectURI))
+		}
+		if cl.ServiceName == "" {
+			errs = append(errs, fmt.Errorf("%s: service_name is required", prefix))
+		}
+	}
+
 	return errors.Join(errs...)
 }
 
+// SSOClient looks up a registered SSO client by client_id.
+// Returns nil if no client with that ID is registered.
+func (c *Config) SSOClient(clientID string) *SSOClient {
+	for i := range c.SSO.Clients {
+		if c.SSO.Clients[i].ClientID == clientID {
+			return &c.SSO.Clients[i]
+		}
+	}
+	return nil
+}
+
+// SSOEnabled reports whether any SSO clients are registered.
+func (c *Config) SSOEnabled() bool {
+	return len(c.SSO.Clients) > 0
+}
+
 // DefaultExpiry returns the configured default token expiry duration.
 func (c *Config) DefaultExpiry() time.Duration { return c.Tokens.DefaultExpiry.Duration }
 

internal/config/config_test.go

@@ -244,6 +244,153 @@ func TestTrustedProxyValidation(t *testing.T) {
 	}
 }
 
+func TestSSOClientValidation(t *testing.T) {
+	tests := []struct {
+		name    string
+		extra   string
+		wantErr bool
+	}{
+		{
+			name: "valid single client",
+			extra: `
+[[sso.clients]]
+client_id    = "mcr"
+redirect_uri = "https://mcr.example.com/sso/callback"
+service_name = "mcr"
+tags         = ["env:restricted"]
+`,
+			wantErr: false,
+		},
+		{
+			name: "valid multiple clients",
+			extra: `
+[[sso.clients]]
+client_id    = "mcr"
+redirect_uri = "https://mcr.example.com/sso/callback"
+service_name = "mcr"
+
+[[sso.clients]]
+client_id    = "mcat"
+redirect_uri = "https://mcat.example.com/sso/callback"
+service_name = "mcat"
+`,
+			wantErr: false,
+		},
+		{
+			name: "missing client_id",
+			extra: `
+[[sso.clients]]
+redirect_uri = "https://mcr.example.com/sso/callback"
+service_name = "mcr"
+`,
+			wantErr: true,
+		},
+		{
+			name: "missing redirect_uri",
+			extra: `
+[[sso.clients]]
+client_id    = "mcr"
+service_name = "mcr"
+`,
+			wantErr: true,
+		},
+		{
+			name: "http redirect_uri rejected",
+			extra: `
+[[sso.clients]]
+client_id    = "mcr"
+redirect_uri = "http://mcr.example.com/sso/callback"
+service_name = "mcr"
+`,
+			wantErr: true,
+		},
+		{
+			name: "missing service_name",
+			extra: `
+[[sso.clients]]
+client_id    = "mcr"
+redirect_uri = "https://mcr.example.com/sso/callback"
+`,
+			wantErr: true,
+		},
+		{
+			name: "duplicate client_id",
+			extra: `
+[[sso.clients]]
+client_id    = "mcr"
+redirect_uri = "https://mcr.example.com/sso/callback"
+service_name = "mcr"
+
+[[sso.clients]]
+client_id    = "mcr"
+redirect_uri = "https://other.example.com/sso/callback"
+service_name = "mcr2"
+`,
+			wantErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			path := writeTempConfig(t, validConfig()+tc.extra)
+			_, err := Load(path)
+			if tc.wantErr && err == nil {
+				t.Error("expected validation error, got nil")
+			}
+			if !tc.wantErr && err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+		})
+	}
+}
+
+func TestSSOClientLookup(t *testing.T) {
+	path := writeTempConfig(t, validConfig()+`
+[[sso.clients]]
+client_id    = "mcr"
+redirect_uri = "https://mcr.example.com/sso/callback"
+service_name = "mcr"
+tags         = ["env:restricted"]
+`)
+	cfg, err := Load(path)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+
+	cl := cfg.SSOClient("mcr")
+	if cl == nil {
+		t.Fatal("SSOClient(mcr) returned nil")
+	}
+	if cl.RedirectURI != "https://mcr.example.com/sso/callback" {
+		t.Errorf("RedirectURI = %q", cl.RedirectURI)
+	}
+	if cl.ServiceName != "mcr" {
+		t.Errorf("ServiceName = %q", cl.ServiceName)
+	}
+	if len(cl.Tags) != 1 || cl.Tags[0] != "env:restricted" {
+		t.Errorf("Tags = %v", cl.Tags)
+	}
+
+	if cfg.SSOClient("nonexistent") != nil {
+		t.Error("SSOClient(nonexistent) should return nil")
+	}
+
+	if !cfg.SSOEnabled() {
+		t.Error("SSOEnabled() should return true")
+	}
+}
+
+func TestSSODisabledByDefault(t *testing.T) {
+	path := writeTempConfig(t, validConfig())
+	cfg, err := Load(path)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if cfg.SSOEnabled() {
+		t.Error("SSOEnabled() should return false with no clients")
+	}
+}
+
 func TestDurationParsing(t *testing.T) {
 	var d duration
 	if err := d.UnmarshalText([]byte("1h30m")); err != nil {

internal/db/accounts.go

@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 	"github.com/google/uuid"
 )
 

internal/db/db_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // openTestDB opens an in-memory SQLite database for testing.

internal/db/mciasdb_test.go

@@ -4,7 +4,7 @@ import (
 	"testing"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // openTestDB is defined in db_test.go in this package; reused here.

internal/db/pgcred_access.go

@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // ListCredentialedAccountIDs returns the set of account IDs that already have

internal/db/policy.go

@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // policyRuleCols is the column list for all policy rule SELECT queries.

internal/db/policy_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 func TestCreateAndGetPolicyRule(t *testing.T) {

internal/db/snapshot.go

@@ -0,0 +1,68 @@
+package db
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+// Snapshot creates a consistent backup of the database at destPath using
+// SQLite's VACUUM INTO statement.  VACUUM INTO acquires a read lock for the
+// duration of the copy, which is safe while the server is running in WAL mode.
+// The destination file is created by SQLite; the caller must ensure the parent
+// directory exists.
+func (db *DB) Snapshot(destPath string) error {
+	// VACUUM INTO is not supported on in-memory databases.
+	if strings.Contains(db.path, "mode=memory") {
+		return fmt.Errorf("db: snapshot not supported on in-memory databases")
+	}
+	if _, err := db.sql.Exec("VACUUM INTO ?", destPath); err != nil {
+		return fmt.Errorf("db: snapshot VACUUM INTO %q: %w", destPath, err)
+	}
+	return nil
+}
+
+// SnapshotDir creates a timestamped backup in dir and prunes backups older
+// than retainDays days.  dir is created with mode 0750 if it does not exist.
+// The backup filename format is mcias-20060102-150405.db.
+func (db *DB) SnapshotDir(dir string, retainDays int) (string, error) {
+	if err := os.MkdirAll(dir, 0750); err != nil {
+		return "", fmt.Errorf("db: create backup dir %q: %w", dir, err)
+	}
+
+	ts := time.Now().UTC().Format("20060102-150405")
+	dest := filepath.Join(dir, fmt.Sprintf("mcias-%s.db", ts))
+	if err := db.Snapshot(dest); err != nil {
+		return "", err
+	}
+
+	// Prune backups older than retainDays.
+	if retainDays > 0 {
+		cutoff := time.Now().UTC().AddDate(0, 0, -retainDays)
+		entries, err := os.ReadDir(dir)
+		if err != nil {
+			// Non-fatal: the backup was written; log pruning failure separately.
+			return dest, fmt.Errorf("db: list backup dir for pruning: %w", err)
+		}
+		for _, e := range entries {
+			if e.IsDir() || !strings.HasSuffix(e.Name(), ".db") {
+				continue
+			}
+			// Skip the file we just wrote.
+			if e.Name() == filepath.Base(dest) {
+				continue
+			}
+			info, err := e.Info()
+			if err != nil {
+				continue
+			}
+			if info.ModTime().Before(cutoff) {
+				_ = os.Remove(filepath.Join(dir, e.Name()))
+			}
+		}
+	}
+
+	return dest, nil
+}

internal/db/tags_test.go

@@ -3,7 +3,7 @@ package db
 import (
 	"testing"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 func TestGetAccountTags_Empty(t *testing.T) {

internal/db/webauthn.go

@@ -5,7 +5,7 @@ import (
 	"errors"
 	"fmt"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // CreateWebAuthnCredential inserts a new WebAuthn credential record.

internal/db/webauthn_test.go

@@ -4,7 +4,7 @@ import (
 	"errors"
 	"testing"
 
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 func TestWebAuthnCRUD(t *testing.T) {

internal/grpcserver/accountservice.go

@@ -11,11 +11,11 @@ import (
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/validate"
+	"git.wntrmute.dev/mc/mcias/internal/validate"
 )
 
 type accountServiceServer struct {

internal/grpcserver/admin.go

@@ -9,7 +9,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
 )
 
 type adminServiceServer struct {

internal/grpcserver/auth.go

@@ -13,12 +13,12 @@ import (
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
-	"git.wntrmute.dev/kyle/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/audit"
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
 )
 
 type authServiceServer struct {

internal/grpcserver/credentialservice.go

@@ -9,10 +9,10 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 type credentialServiceServer struct {

internal/grpcserver/grpcserver.go

@@ -30,11 +30,11 @@ import (
 	"google.golang.org/grpc/peer"
 	"google.golang.org/grpc/status"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
-	"git.wntrmute.dev/kyle/mcias/internal/config"
+	"git.wntrmute.dev/mc/mcias/internal/config"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 // contextKey is the unexported context key type for this package.

internal/grpcserver/grpcserver_test.go

@@ -24,13 +24,13 @@ import (
 	"google.golang.org/grpc/status"
 	"google.golang.org/grpc/test/bufconn"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/config"
+	"git.wntrmute.dev/mc/mcias/internal/config"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 const (

internal/grpcserver/policyservice.go

@@ -13,10 +13,10 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/policy"
+	"git.wntrmute.dev/mc/mcias/internal/policy"
 )
 
 type policyServiceServer struct {

internal/grpcserver/tokenservice.go

@@ -10,10 +10,10 @@ import (
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
 )
 
 type tokenServiceServer struct {

internal/grpcserver/webauthn.go

@@ -11,8 +11,8 @@ import (
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
-	mciasv1 "git.wntrmute.dev/kyle/mcias/gen/mcias/v1"
+	mciasv1 "git.wntrmute.dev/mc/mcias/gen/mcias/v1"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // ListWebAuthnCredentials returns metadata for an account's WebAuthn credentials.

internal/middleware/middleware.go

@@ -23,10 +23,10 @@ import (
 	"sync"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/policy"
+	"git.wntrmute.dev/mc/mcias/internal/policy"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 // contextKey is the unexported type for context keys in this package, preventing

internal/middleware/middleware_test.go

@@ -12,10 +12,10 @@ import (
 	"testing"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 func generateTestKey(t *testing.T) (ed25519.PublicKey, ed25519.PrivateKey) {

internal/model/model.go

@@ -218,6 +218,9 @@ const (
 	EventWebAuthnRemoved   = "webauthn_removed"
 	EventWebAuthnLoginOK   = "webauthn_login_ok"
 	EventWebAuthnLoginFail = "webauthn_login_fail"
+
+	EventSSOAuthorize = "sso_authorize"
+	EventSSOLoginOK   = "sso_login_ok"
 )
 
 // ServiceAccountDelegate records that a specific account has been granted

internal/server/handlers_policy.go

@@ -8,10 +8,10 @@ import (
 	"strconv"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/middleware"
+	"git.wntrmute.dev/mc/mcias/internal/middleware"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/policy"
+	"git.wntrmute.dev/mc/mcias/internal/policy"
 )
 
 // ---- Tag endpoints ----

internal/server/handlers_sso.go

@@ -0,0 +1,141 @@
+package server
+
+import (
+	"net/http"
+
+	"git.wntrmute.dev/mc/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/middleware"
+	"git.wntrmute.dev/mc/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/policy"
+	"git.wntrmute.dev/mc/mcias/internal/sso"
+	"git.wntrmute.dev/mc/mcias/internal/token"
+)
+
+// ssoTokenRequest is the request body for POST /v1/sso/token.
+type ssoTokenRequest struct {
+	Code        string `json:"code"`
+	ClientID    string `json:"client_id"`
+	RedirectURI string `json:"redirect_uri"`
+}
+
+// handleSSOTokenExchange exchanges an SSO authorization code for a JWT token.
+//
+// Security design:
+//   - The authorization code is single-use (consumed via LoadAndDelete).
+//   - The client_id and redirect_uri must match the values stored when the code
+//     was issued, preventing a stolen code from being exchanged by a different
+//     service.
+//   - Policy evaluation uses the service_name and tags from the registered SSO
+//     client config (not from the request), preventing identity spoofing.
+//   - The code expires after 60 seconds to limit the interception window.
+func (s *Server) handleSSOTokenExchange(w http.ResponseWriter, r *http.Request) {
+	var req ssoTokenRequest
+	if !decodeJSON(w, r, &req) {
+		return
+	}
+
+	if req.Code == "" || req.ClientID == "" || req.RedirectURI == "" {
+		middleware.WriteError(w, http.StatusBadRequest, "code, client_id, and redirect_uri are required", "bad_request")
+		return
+	}
+
+	// Consume the authorization code (single-use).
+	ac, ok := sso.Consume(req.Code)
+	if !ok {
+		middleware.WriteError(w, http.StatusUnauthorized, "invalid or expired authorization code", "invalid_code")
+		return
+	}
+
+	// Security: verify client_id and redirect_uri match the stored values.
+	if ac.ClientID != req.ClientID || ac.RedirectURI != req.RedirectURI {
+		s.logger.Warn("sso: token exchange parameter mismatch",
+			"expected_client", ac.ClientID, "got_client", req.ClientID)
+		middleware.WriteError(w, http.StatusUnauthorized, "invalid or expired authorization code", "invalid_code")
+		return
+	}
+
+	// Look up the registered SSO client for policy context.
+	client := s.cfg.SSOClient(req.ClientID)
+	if client == nil {
+		// Should not happen if the authorize endpoint validated, but defend in depth.
+		middleware.WriteError(w, http.StatusUnauthorized, "unknown client", "invalid_code")
+		return
+	}
+
+	// Load account.
+	acct, err := s.db.GetAccountByID(ac.AccountID)
+	if err != nil {
+		s.logger.Error("sso: load account for token exchange", "error", err, "account_id", ac.AccountID)
+		middleware.WriteError(w, http.StatusInternalServerError, "internal error", "internal_error")
+		return
+	}
+
+	if acct.Status != model.AccountStatusActive {
+		middleware.WriteError(w, http.StatusForbidden, "account is not active", "account_inactive")
+		return
+	}
+
+	// Load roles for policy evaluation and expiry decision.
+	roles, err := s.db.GetRoles(acct.ID)
+	if err != nil {
+		middleware.WriteError(w, http.StatusInternalServerError, "internal error", "internal_error")
+		return
+	}
+
+	// Policy evaluation with the SSO client's service_name and tags.
+	{
+		input := policy.PolicyInput{
+			Subject:     acct.UUID,
+			AccountType: string(acct.AccountType),
+			Roles:       roles,
+			Action:      policy.ActionLogin,
+			Resource: policy.Resource{
+				ServiceName: client.ServiceName,
+				Tags:        client.Tags,
+			},
+		}
+		if effect, _ := s.polEng.Evaluate(input); effect == policy.Deny {
+			s.writeAudit(r, model.EventLoginFail, &acct.ID, nil,
+				audit.JSON("reason", "policy_deny", "service_name", client.ServiceName, "via", "sso"))
+			middleware.WriteError(w, http.StatusForbidden, "access denied by policy", "policy_denied")
+			return
+		}
+	}
+
+	// Determine expiry.
+	expiry := s.cfg.DefaultExpiry()
+	for _, rol := range roles {
+		if rol == "admin" {
+			expiry = s.cfg.AdminExpiry()
+			break
+		}
+	}
+
+	privKey, err := s.vault.PrivKey()
+	if err != nil {
+		middleware.WriteError(w, http.StatusServiceUnavailable, "vault sealed", "vault_sealed")
+		return
+	}
+	tokenStr, claims, err := token.IssueToken(privKey, s.cfg.Tokens.Issuer, acct.UUID, roles, expiry)
+	if err != nil {
+		s.logger.Error("sso: issue token", "error", err)
+		middleware.WriteError(w, http.StatusInternalServerError, "internal error", "internal_error")
+		return
+	}
+
+	if err := s.db.TrackToken(claims.JTI, acct.ID, claims.IssuedAt, claims.ExpiresAt); err != nil {
+		s.logger.Error("sso: track token", "error", err)
+		middleware.WriteError(w, http.StatusInternalServerError, "internal error", "internal_error")
+		return
+	}
+
+	s.writeAudit(r, model.EventSSOLoginOK, &acct.ID, nil,
+		audit.JSON("jti", claims.JTI, "client_id", client.ClientID))
+	s.writeAudit(r, model.EventTokenIssued, &acct.ID, nil,
+		audit.JSON("jti", claims.JTI, "via", "sso"))
+
+	writeJSON(w, http.StatusOK, loginResponse{
+		Token:     tokenStr,
+		ExpiresAt: claims.ExpiresAt.Format("2006-01-02T15:04:05Z"),
+	})
+}

internal/server/handlers_webauthn.go

@@ -23,13 +23,14 @@ import (
 	"github.com/go-webauthn/webauthn/protocol"
 	libwebauthn "github.com/go-webauthn/webauthn/webauthn"
 
-	"git.wntrmute.dev/kyle/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/audit"
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/middleware"
+	"git.wntrmute.dev/mc/mcias/internal/middleware"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/policy"
-	mciaswebauthn "git.wntrmute.dev/kyle/mcias/internal/webauthn"
+	"git.wntrmute.dev/mc/mcias/internal/token"
+	mciaswebauthn "git.wntrmute.dev/mc/mcias/internal/webauthn"
 )
 
 const (
@@ -618,13 +619,37 @@ func (s *Server) handleWebAuthnLoginFinish(w http.ResponseWriter, r *http.Reques
 	// Login succeeded: clear lockout counter.
 	_ = s.db.ClearLoginFailures(acct.ID)
 
-	// Issue JWT.
+	// Load roles for policy check and expiry decision.
 	roles, err := s.db.GetRoles(acct.ID)
 	if err != nil {
 		middleware.WriteError(w, http.StatusInternalServerError, "internal error", "internal_error")
 		return
 	}
 
+	// Policy check: evaluate auth:login rules.
+	// WebAuthn login has no service context (no service_name or tags in the
+	// request body), so per-service deny rules won't fire. Account-level deny
+	// rules (e.g. deny a specific role from all auth:login actions) apply.
+	// This mirrors the policy gate in handleLogin so both auth paths are consistent.
+	//
+	// Security: policy is checked after credential verification so that a
+	// policy-denied login returns 403 (not 401), distinguishing a policy
+	// restriction from a bad credential without leaking account existence.
+	if s.polEng != nil {
+		input := policy.PolicyInput{
+			Subject:     acct.UUID,
+			AccountType: string(acct.AccountType),
+			Roles:       roles,
+			Action:      policy.ActionLogin,
+			Resource:    policy.Resource{},
+		}
+		if effect, _ := s.polEng.Evaluate(input); effect == policy.Deny {
+			s.writeAudit(r, model.EventWebAuthnLoginFail, &acct.ID, nil, `{"reason":"policy_denied"}`)
+			middleware.WriteError(w, http.StatusForbidden, "access denied by policy", "policy_denied")
+			return
+		}
+	}
+
 	expiry := s.cfg.DefaultExpiry()
 	for _, role := range roles {
 		if role == "admin" {

internal/server/server.go

@@ -21,19 +21,19 @@ import (
 	"strings"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/audit"
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/config"
+	"git.wntrmute.dev/mc/mcias/internal/config"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/middleware"
+	"git.wntrmute.dev/mc/mcias/internal/middleware"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/policy"
+	"git.wntrmute.dev/mc/mcias/internal/policy"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
-	"git.wntrmute.dev/kyle/mcias/internal/ui"
+	"git.wntrmute.dev/mc/mcias/internal/ui"
-	"git.wntrmute.dev/kyle/mcias/internal/validate"
+	"git.wntrmute.dev/mc/mcias/internal/validate"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
-	"git.wntrmute.dev/kyle/mcias/web"
+	"git.wntrmute.dev/mc/mcias/web"
 )
 
 // Server holds the dependencies injected into all handlers.
@@ -215,6 +215,7 @@ func (s *Server) Handler() http.Handler {
 	mux.HandleFunc("GET /v1/health", s.handleHealth)
 	mux.HandleFunc("GET /v1/keys/public", s.handlePublicKey)
 	mux.Handle("POST /v1/auth/login", loginRateLimit(http.HandlerFunc(s.handleLogin)))
+	mux.Handle("POST /v1/sso/token", loginRateLimit(http.HandlerFunc(s.handleSSOTokenExchange)))
 	mux.Handle("POST /v1/token/validate", loginRateLimit(http.HandlerFunc(s.handleTokenValidate)))
 
 	// API documentation: Swagger UI at /docs and raw spec at /docs/openapi.yaml.
@@ -436,6 +437,12 @@ type loginRequest struct {
 	Username string `json:"username"`
 	Password string `json:"password"`
 	TOTPCode string `json:"totp_code,omitempty"`
+	// ServiceName and Tags identify the calling service. MCIAS evaluates the
+	// auth:login policy with these as the resource context, enabling operators
+	// to restrict which roles/account-types may log into specific services.
+	// Clients populate these from their [mcias] config section.
+	ServiceName string   `json:"service_name,omitempty"`
+	Tags        []string `json:"tags,omitempty"`
 }
 
 // loginResponse is the response body for a successful login.
@@ -546,13 +553,42 @@ func (s *Server) handleLogin(w http.ResponseWriter, r *http.Request) {
 	// Login succeeded: clear any outstanding failure counter.
 	_ = s.db.ClearLoginFailures(acct.ID)
 
-	// Determine expiry.
+	// Load roles for expiry decision and policy check.
-	expiry := s.cfg.DefaultExpiry()
 	roles, err := s.db.GetRoles(acct.ID)
 	if err != nil {
 		middleware.WriteError(w, http.StatusInternalServerError, "internal error", "internal_error")
 		return
 	}
+
+	// Policy check: evaluate auth:login with the calling service's context.
+	// Operator rules can deny login based on role, account type, service name,
+	// or tags. The built-in default Allow for auth:login is overridden by any
+	// matching Deny rule (deny-wins semantics).
+	//
+	// Security: policy is checked after credential verification so that a
+	// policy-denied login returns 403 (not 401), distinguishing a service
+	// access restriction from a wrong password without leaking user existence.
+	{
+		input := policy.PolicyInput{
+			Subject:     acct.UUID,
+			AccountType: string(acct.AccountType),
+			Roles:       roles,
+			Action:      policy.ActionLogin,
+			Resource: policy.Resource{
+				ServiceName: req.ServiceName,
+				Tags:        req.Tags,
+			},
+		}
+		if effect, _ := s.polEng.Evaluate(input); effect == policy.Deny {
+			s.writeAudit(r, model.EventLoginFail, &acct.ID, nil,
+				audit.JSON("reason", "policy_deny", "service_name", req.ServiceName))
+			middleware.WriteError(w, http.StatusForbidden, "access denied by policy", "policy_denied")
+			return
+		}
+	}
+
+	// Determine expiry.
+	expiry := s.cfg.DefaultExpiry()
 	for _, r := range roles {
 		if r == "admin" {
 			expiry = s.cfg.AdminExpiry()
@@ -669,11 +705,12 @@ type validateRequest struct {
 }
 
 type validateResponse struct {
-	Subject   string   `json:"sub,omitempty"`
+	Subject     string   `json:"sub,omitempty"`
-	Username  string   `json:"username,omitempty"`
+	Username    string   `json:"username,omitempty"`
-	ExpiresAt string   `json:"expires_at,omitempty"`
+	AccountType string   `json:"account_type,omitempty"`
-	Roles     []string `json:"roles,omitempty"`
+	ExpiresAt   string   `json:"expires_at,omitempty"`
-	Valid     bool     `json:"valid"`
+	Roles       []string `json:"roles,omitempty"`
+	Valid       bool     `json:"valid"`
 }
 
 func (s *Server) handleTokenValidate(w http.ResponseWriter, r *http.Request) {
@@ -718,6 +755,7 @@ func (s *Server) handleTokenValidate(w http.ResponseWriter, r *http.Request) {
 	}
 	if acct, err := s.db.GetAccountByUUID(claims.Subject); err == nil {
 		resp.Username = acct.Username
+		resp.AccountType = string(acct.AccountType)
 	}
 	writeJSON(w, http.StatusOK, resp)
 }

internal/server/server_test.go

@@ -19,13 +19,13 @@ import (
 	"testing"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/config"
+	"git.wntrmute.dev/mc/mcias/internal/config"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/policy"
+	"git.wntrmute.dev/mc/mcias/internal/policy"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 // generateTOTPCode computes a valid RFC 6238 TOTP code for the current time

internal/server/vault.go

@@ -4,10 +4,10 @@ package server
 import (
 	"net/http"
 
-	"git.wntrmute.dev/kyle/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/audit"
-	"git.wntrmute.dev/kyle/mcias/internal/middleware"
+	"git.wntrmute.dev/mc/mcias/internal/middleware"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 // unsealRequest is the request body for POST /v1/vault/unseal.

internal/server/vault_test.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 	"testing"
 
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 func TestHandleHealthSealed(t *testing.T) {

internal/sso/session.go

@@ -0,0 +1,91 @@
+package sso
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
+)
+
+const (
+	sessionTTL   = 5 * time.Minute
+	sessionBytes = 16 // 128 bits of entropy for the nonce
+)
+
+// Session holds the SSO parameters between /sso/authorize and login completion.
+// The nonce is embedded as a hidden form field in the login page and carried
+// through the multi-step login flow (password → TOTP, or WebAuthn).
+type Session struct { //nolint:govet // fieldalignment: field order matches logical grouping
+	ClientID    string
+	RedirectURI string
+	State       string
+	ExpiresAt   time.Time
+}
+
+// pendingSessions stores SSO sessions created at /sso/authorize.
+var pendingSessions sync.Map //nolint:gochecknoglobals
+
+func init() {
+	go cleanupSessions()
+}
+
+func cleanupSessions() {
+	ticker := time.NewTicker(cleanupPeriod)
+	defer ticker.Stop()
+	for range ticker.C {
+		now := time.Now()
+		pendingSessions.Range(func(key, value any) bool {
+			s, ok := value.(*Session)
+			if !ok || now.After(s.ExpiresAt) {
+				pendingSessions.Delete(key)
+			}
+			return true
+		})
+	}
+}
+
+// StoreSession creates and stores a new SSO session, returning the hex-encoded
+// nonce that should be embedded in the login form.
+func StoreSession(clientID, redirectURI, state string) (string, error) {
+	raw, err := crypto.RandomBytes(sessionBytes)
+	if err != nil {
+		return "", fmt.Errorf("sso: generate session nonce: %w", err)
+	}
+	nonce := fmt.Sprintf("%x", raw)
+	pendingSessions.Store(nonce, &Session{
+		ClientID:    clientID,
+		RedirectURI: redirectURI,
+		State:       state,
+		ExpiresAt:   time.Now().Add(sessionTTL),
+	})
+	return nonce, nil
+}
+
+// ConsumeSession retrieves and deletes an SSO session by nonce.
+// Returns the Session and true if valid, or (nil, false) if unknown or expired.
+func ConsumeSession(nonce string) (*Session, bool) {
+	v, ok := pendingSessions.LoadAndDelete(nonce)
+	if !ok {
+		return nil, false
+	}
+	s, ok2 := v.(*Session)
+	if !ok2 || time.Now().After(s.ExpiresAt) {
+		return nil, false
+	}
+	return s, true
+}
+
+// GetSession retrieves an SSO session without consuming it (for read-only checks
+// during multi-step login). Returns nil if unknown or expired.
+func GetSession(nonce string) *Session {
+	v, ok := pendingSessions.Load(nonce)
+	if !ok {
+		return nil
+	}
+	s, ok2 := v.(*Session)
+	if !ok2 || time.Now().After(s.ExpiresAt) {
+		return nil
+	}
+	return s
+}

internal/sso/store.go

@@ -0,0 +1,93 @@
+// Package sso implements the authorization code store for the SSO redirect flow.
+//
+// MCIAS acts as the SSO provider: downstream services (MCR, MCAT, Metacrypt)
+// redirect users to MCIAS for login, and MCIAS issues a short-lived, single-use
+// authorization code that the service exchanges for a JWT token.
+//
+// Security design:
+//   - Authorization codes are 32 random bytes (256 bits), hex-encoded.
+//   - Codes are single-use: consumed via sync.Map LoadAndDelete on first exchange.
+//   - Codes expire after 60 seconds to limit the window for interception.
+//   - A background goroutine evicts expired codes every 5 minutes.
+//   - The code is bound to the client_id and redirect_uri presented at authorize
+//     time; the token exchange endpoint must verify both match.
+package sso
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
+)
+
+const (
+	codeTTL       = 60 * time.Second
+	codeBytes     = 32 // 256 bits of entropy
+	cleanupPeriod = 5 * time.Minute
+)
+
+// AuthCode is a pending authorization code awaiting exchange for a JWT.
+type AuthCode struct { //nolint:govet // fieldalignment: field order matches logical grouping
+	ClientID    string
+	RedirectURI string
+	State       string
+	AccountID   int64
+	ExpiresAt   time.Time
+}
+
+// pendingCodes stores issued authorization codes awaiting exchange.
+var pendingCodes sync.Map //nolint:gochecknoglobals
+
+func init() {
+	go cleanupCodes()
+}
+
+func cleanupCodes() {
+	ticker := time.NewTicker(cleanupPeriod)
+	defer ticker.Stop()
+	for range ticker.C {
+		now := time.Now()
+		pendingCodes.Range(func(key, value any) bool {
+			ac, ok := value.(*AuthCode)
+			if !ok || now.After(ac.ExpiresAt) {
+				pendingCodes.Delete(key)
+			}
+			return true
+		})
+	}
+}
+
+// Store creates and stores a new authorization code bound to the given
+// client_id, redirect_uri, state, and account. Returns the hex-encoded code.
+func Store(clientID, redirectURI, state string, accountID int64) (string, error) {
+	raw, err := crypto.RandomBytes(codeBytes)
+	if err != nil {
+		return "", fmt.Errorf("sso: generate authorization code: %w", err)
+	}
+	code := fmt.Sprintf("%x", raw)
+	pendingCodes.Store(code, &AuthCode{
+		ClientID:    clientID,
+		RedirectURI: redirectURI,
+		State:       state,
+		AccountID:   accountID,
+		ExpiresAt:   time.Now().Add(codeTTL),
+	})
+	return code, nil
+}
+
+// Consume retrieves and deletes an authorization code. Returns the AuthCode
+// and true if the code was valid and not expired, or (nil, false) otherwise.
+//
+// Security: LoadAndDelete ensures single-use; the code cannot be replayed.
+func Consume(code string) (*AuthCode, bool) {
+	v, ok := pendingCodes.LoadAndDelete(code)
+	if !ok {
+		return nil, false
+	}
+	ac, ok2 := v.(*AuthCode)
+	if !ok2 || time.Now().After(ac.ExpiresAt) {
+		return nil, false
+	}
+	return ac, true
+}

internal/sso/store_test.go

@@ -0,0 +1,132 @@
+package sso
+
+import (
+	"testing"
+	"time"
+)
+
+func TestStoreAndConsume(t *testing.T) {
+	code, err := Store("mcr", "https://mcr.example.com/cb", "state123", 42)
+	if err != nil {
+		t.Fatalf("Store: %v", err)
+	}
+	if code == "" {
+		t.Fatal("Store returned empty code")
+	}
+
+	ac, ok := Consume(code)
+	if !ok {
+		t.Fatal("Consume returned false for valid code")
+	}
+	if ac.ClientID != "mcr" {
+		t.Errorf("ClientID = %q, want %q", ac.ClientID, "mcr")
+	}
+	if ac.RedirectURI != "https://mcr.example.com/cb" {
+		t.Errorf("RedirectURI = %q", ac.RedirectURI)
+	}
+	if ac.State != "state123" {
+		t.Errorf("State = %q", ac.State)
+	}
+	if ac.AccountID != 42 {
+		t.Errorf("AccountID = %d, want 42", ac.AccountID)
+	}
+}
+
+func TestConsumeSingleUse(t *testing.T) {
+	code, err := Store("mcr", "https://mcr.example.com/cb", "s", 1)
+	if err != nil {
+		t.Fatalf("Store: %v", err)
+	}
+
+	if _, ok := Consume(code); !ok {
+		t.Fatal("first Consume should succeed")
+	}
+	if _, ok := Consume(code); ok {
+		t.Error("second Consume should fail (single-use)")
+	}
+}
+
+func TestConsumeUnknownCode(t *testing.T) {
+	if _, ok := Consume("nonexistent"); ok {
+		t.Error("Consume should fail for unknown code")
+	}
+}
+
+func TestConsumeExpiredCode(t *testing.T) {
+	code, err := Store("mcr", "https://mcr.example.com/cb", "s", 1)
+	if err != nil {
+		t.Fatalf("Store: %v", err)
+	}
+
+	// Manually expire the code.
+	v, loaded := pendingCodes.Load(code)
+	if !loaded {
+		t.Fatal("code not found in pendingCodes")
+	}
+	ac, ok := v.(*AuthCode)
+	if !ok {
+		t.Fatal("unexpected type in pendingCodes")
+	}
+	ac.ExpiresAt = time.Now().Add(-1 * time.Second)
+
+	if _, ok := Consume(code); ok {
+		t.Error("Consume should fail for expired code")
+	}
+}
+
+func TestStoreSessionAndConsume(t *testing.T) {
+	nonce, err := StoreSession("mcr", "https://mcr.example.com/cb", "state456")
+	if err != nil {
+		t.Fatalf("StoreSession: %v", err)
+	}
+	if nonce == "" {
+		t.Fatal("StoreSession returned empty nonce")
+	}
+
+	// GetSession should return it without consuming.
+	s := GetSession(nonce)
+	if s == nil {
+		t.Fatal("GetSession returned nil")
+	}
+	if s.ClientID != "mcr" {
+		t.Errorf("ClientID = %q", s.ClientID)
+	}
+
+	// Still available after GetSession.
+	s2, ok := ConsumeSession(nonce)
+	if !ok {
+		t.Fatal("ConsumeSession returned false")
+	}
+	if s2.State != "state456" {
+		t.Errorf("State = %q", s2.State)
+	}
+
+	// Consumed — should be gone.
+	if _, ok := ConsumeSession(nonce); ok {
+		t.Error("second ConsumeSession should fail")
+	}
+	if GetSession(nonce) != nil {
+		t.Error("GetSession should return nil after consume")
+	}
+}
+
+func TestConsumeSessionExpired(t *testing.T) {
+	nonce, err := StoreSession("mcr", "https://mcr.example.com/cb", "s")
+	if err != nil {
+		t.Fatalf("StoreSession: %v", err)
+	}
+
+	v, loaded := pendingSessions.Load(nonce)
+	if !loaded {
+		t.Fatal("session not found in pendingSessions")
+	}
+	sess, ok := v.(*Session)
+	if !ok {
+		t.Fatal("unexpected type in pendingSessions")
+	}
+	sess.ExpiresAt = time.Now().Add(-1 * time.Second)
+
+	if _, ok := ConsumeSession(nonce); ok {
+		t.Error("ConsumeSession should fail for expired session")
+	}
+}

internal/ui/context.go

@@ -3,7 +3,7 @@ package ui
 import (
 	"context"
 
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
 )
 
 // uiContextKey is the unexported type for UI context values, preventing

internal/ui/csrf.go

@@ -10,7 +10,7 @@ import (
 	"fmt"
 	"sync"
 
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 // CSRFManager implements HMAC-signed Double-Submit Cookie CSRF protection.

internal/ui/handlers_accounts.go

@@ -7,11 +7,11 @@ import (
 	"strconv"
 	"strings"
 
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/validate"
+	"git.wntrmute.dev/mc/mcias/internal/validate"
 )
 
 // knownRoles lists the built-in roles shown as checkboxes in the roles editor.

internal/ui/handlers_audit.go

@@ -4,8 +4,8 @@ import (
 	"net/http"
 	"strconv"
 
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 const auditPageSize = 50

internal/ui/handlers_auth.go

@@ -3,18 +3,19 @@ package ui
 import (
 	"net/http"
 
-	"git.wntrmute.dev/kyle/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/audit"
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
-	"git.wntrmute.dev/kyle/mcias/internal/validate"
+	"git.wntrmute.dev/mc/mcias/internal/validate"
 )
 
 // handleLoginPage renders the login form.
 func (u *UIServer) handleLoginPage(w http.ResponseWriter, r *http.Request) {
 	u.render(w, "login", LoginData{
 		WebAuthnEnabled: u.cfg.WebAuthnEnabled(),
+		SSONonce:        r.URL.Query().Get("sso"),
 	})
 }
 
@@ -97,6 +98,8 @@ func (u *UIServer) handleLoginPost(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	ssoNonce := r.FormValue("sso_nonce")
+
 	// TOTP required: issue a server-side nonce and show the TOTP step form.
 	// Security: the nonce replaces the password hidden field (F-02). The password
 	// is not stored anywhere after this point; only the account ID is retained.
@@ -110,11 +113,12 @@ func (u *UIServer) handleLoginPost(w http.ResponseWriter, r *http.Request) {
 		u.render(w, "totp_step", LoginData{
 			Username: username,
 			Nonce:    nonce,
+			SSONonce: ssoNonce,
 		})
 		return
 	}
 
-	u.finishLogin(w, r, acct)
+	u.finishLogin(w, r, acct, ssoNonce)
 }
 
 // handleTOTPStep handles the second POST when totp_step=1 is set.
@@ -129,6 +133,7 @@ func (u *UIServer) handleTOTPStep(w http.ResponseWriter, r *http.Request) {
 	username := r.FormValue("username")  //nolint:gosec // body already limited by caller
 	nonce := r.FormValue("totp_nonce")   //nolint:gosec // body already limited by caller
 	totpCode := r.FormValue("totp_code") //nolint:gosec // body already limited by caller
+	ssoNonce := r.FormValue("sso_nonce") //nolint:gosec // body already limited by caller
 
 	// Security: consume the nonce (single-use); reject if unknown or expired.
 	accountID, ok := u.consumeTOTPNonce(nonce)
@@ -172,6 +177,7 @@ func (u *UIServer) handleTOTPStep(w http.ResponseWriter, r *http.Request) {
 			Error:    "invalid TOTP code",
 			Username: username,
 			Nonce:    newNonce,
+			SSONonce: ssoNonce,
 		})
 		return
 	}
@@ -189,15 +195,36 @@ func (u *UIServer) handleTOTPStep(w http.ResponseWriter, r *http.Request) {
 			Error:    "invalid TOTP code",
 			Username: username,
 			Nonce:    newNonce,
+			SSONonce: ssoNonce,
 		})
 		return
 	}
 
-	u.finishLogin(w, r, acct)
+	u.finishLogin(w, r, acct, ssoNonce)
 }
 
 // finishLogin issues a JWT, sets the session cookie, and redirects to dashboard.
-func (u *UIServer) finishLogin(w http.ResponseWriter, r *http.Request, acct *model.Account) {
+// When ssoNonce is non-empty, the login is part of an SSO redirect flow: instead
+// of setting a session cookie, an authorization code is issued and the user is
+// redirected back to the service's callback URL.
+func (u *UIServer) finishLogin(w http.ResponseWriter, r *http.Request, acct *model.Account, ssoNonce string) {
+	// SSO redirect flow: issue authorization code and redirect to service.
+	if ssoNonce != "" {
+		if callbackURL, ok := u.buildSSOCallback(r, ssoNonce, acct.ID); ok {
+			// Security: htmx follows 302 redirects via fetch, which fails
+			// cross-origin (no CORS on the service callback). Use HX-Redirect
+			// so htmx performs a full page navigation instead.
+			if isHTMX(r) {
+				w.Header().Set("HX-Redirect", callbackURL)
+				w.WriteHeader(http.StatusOK)
+				return
+			}
+			http.Redirect(w, r, callbackURL, http.StatusFound)
+			return
+		}
+		// SSO session expired/consumed — fall through to normal login.
+	}
+
 	// Determine token expiry based on admin role.
 	expiry := u.cfg.DefaultExpiry()
 	roles, err := u.db.GetRoles(acct.ID)

internal/ui/handlers_dashboard.go

@@ -3,8 +3,8 @@ package ui
 import (
 	"net/http"
 
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // handleDashboard renders the main dashboard page.  Admin users see account

internal/ui/handlers_policy.go

@@ -9,9 +9,9 @@ import (
 	"strings"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/policy"
+	"git.wntrmute.dev/mc/mcias/internal/policy"
 )
 
 // ---- Policies page ----

internal/ui/handlers_sso.go

@@ -0,0 +1,84 @@
+package ui
+
+import (
+	"net/http"
+	"net/url"
+
+	"git.wntrmute.dev/mc/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/sso"
+)
+
+// handleSSOAuthorize validates the SSO request parameters against registered
+// clients, creates an SSO session, and redirects to /login with the SSO nonce.
+//
+// Security: the client_id and redirect_uri are validated against the MCIAS
+// config (exact match). The state parameter is opaque and carried through
+// unchanged. An SSO session is created server-side so the nonce is the only
+// value embedded in the login form.
+func (u *UIServer) handleSSOAuthorize(w http.ResponseWriter, r *http.Request) {
+	clientID := r.URL.Query().Get("client_id")
+	redirectURI := r.URL.Query().Get("redirect_uri")
+	state := r.URL.Query().Get("state")
+
+	if clientID == "" || redirectURI == "" || state == "" {
+		http.Error(w, "missing required parameters: client_id, redirect_uri, state", http.StatusBadRequest)
+		return
+	}
+
+	// Security: validate client_id against registered SSO clients.
+	client := u.cfg.SSOClient(clientID)
+	if client == nil {
+		u.logger.Warn("sso: unknown client_id", "client_id", clientID)
+		http.Error(w, "unknown client_id", http.StatusBadRequest)
+		return
+	}
+
+	// Security: redirect_uri must exactly match the registered URI to prevent
+	// open-redirect attacks.
+	if redirectURI != client.RedirectURI {
+		u.logger.Warn("sso: redirect_uri mismatch",
+			"client_id", clientID,
+			"expected", client.RedirectURI,
+			"got", redirectURI)
+		http.Error(w, "redirect_uri does not match registered URI", http.StatusBadRequest)
+		return
+	}
+
+	nonce, err := sso.StoreSession(clientID, redirectURI, state)
+	if err != nil {
+		u.logger.Error("sso: store session", "error", err)
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+
+	u.writeAudit(r, model.EventSSOAuthorize, nil, nil,
+		audit.JSON("client_id", clientID))
+
+	http.Redirect(w, r, "/login?sso="+url.QueryEscape(nonce), http.StatusFound)
+}
+
+// buildSSOCallback consumes the SSO session, generates an authorization code,
+// and returns the callback URL with code and state parameters. Returns ("", false)
+// if the SSO session is expired or already consumed.
+//
+// Security: the SSO session is consumed (single-use) and the authorization code
+// is stored server-side for exchange via POST /v1/sso/token. The state parameter
+// is carried through unchanged for the service to validate.
+func (u *UIServer) buildSSOCallback(r *http.Request, ssoNonce string, accountID int64) (string, bool) {
+	sess, ok := sso.ConsumeSession(ssoNonce)
+	if !ok {
+		return "", false
+	}
+
+	code, err := sso.Store(sess.ClientID, sess.RedirectURI, sess.State, accountID)
+	if err != nil {
+		u.logger.Error("sso: store auth code", "error", err)
+		return "", false
+	}
+
+	u.writeAudit(r, model.EventSSOLoginOK, &accountID, nil,
+		audit.JSON("client_id", sess.ClientID))
+
+	return sess.RedirectURI + "?code=" + url.QueryEscape(code) + "&state=" + url.QueryEscape(sess.State), true
+}

internal/ui/handlers_totp.go

@@ -4,14 +4,15 @@ import (
 	"encoding/base32"
 	"encoding/base64"
 	"fmt"
+	"html/template"
 	"net/http"
 
 	qrcode "github.com/skip2/go-qrcode"
 
-	"git.wntrmute.dev/kyle/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/audit"
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
 )
 
 // handleTOTPEnrollStart processes the password re-auth step and generates
@@ -108,7 +109,7 @@ func (u *UIServer) handleTOTPEnrollStart(w http.ResponseWriter, r *http.Request)
 		u.renderTOTPSection(w, r, ProfileData{TOTPError: "internal error"})
 		return
 	}
-	qrDataURI := "data:image/png;base64," + base64.StdEncoding.EncodeToString(png)
+	qrDataURI := template.URL("data:image/png;base64," + base64.StdEncoding.EncodeToString(png)) //nolint:gosec // G203: trusted server-generated data URI
 
 	// Issue enrollment nonce for the confirm step.
 	nonce, err := u.issueTOTPEnrollNonce(acct.ID)
@@ -224,7 +225,7 @@ func (u *UIServer) reissueTOTPEnrollQR(w http.ResponseWriter, r *http.Request, a
 		u.renderTOTPSection(w, r, ProfileData{TOTPError: "internal error"})
 		return
 	}
-	qrDataURI := "data:image/png;base64," + base64.StdEncoding.EncodeToString(png)
+	qrDataURI := template.URL("data:image/png;base64," + base64.StdEncoding.EncodeToString(png)) //nolint:gosec // G203: trusted server-generated data URI
 
 	newNonce, nonceErr := u.issueTOTPEnrollNonce(acct.ID)
 	if nonceErr != nil {

internal/ui/handlers_vault.go

@@ -4,10 +4,10 @@ package ui
 import (
 	"net/http"
 
-	"git.wntrmute.dev/kyle/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/audit"
-	"git.wntrmute.dev/kyle/mcias/internal/middleware"
+	"git.wntrmute.dev/mc/mcias/internal/middleware"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
 )
 
 // UnsealData is the view model for the unseal page.

internal/ui/handlers_webauthn.go

@@ -12,12 +12,12 @@ import (
 	"github.com/go-webauthn/webauthn/protocol"
 	libwebauthn "github.com/go-webauthn/webauthn/webauthn"
 
-	"git.wntrmute.dev/kyle/mcias/internal/audit"
+	"git.wntrmute.dev/mc/mcias/internal/audit"
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/crypto"
+	"git.wntrmute.dev/mc/mcias/internal/crypto"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
-	mciaswebauthn "git.wntrmute.dev/kyle/mcias/internal/webauthn"
+	mciaswebauthn "git.wntrmute.dev/mc/mcias/internal/webauthn"
 )
 
 const (
@@ -27,10 +27,11 @@ const (
 )
 
 // webauthnCeremony holds a pending WebAuthn ceremony.
-type webauthnCeremony struct {
+type webauthnCeremony struct { //nolint:govet // fieldalignment: field order matches logical grouping
 	expiresAt time.Time
 	session   *libwebauthn.SessionData
 	accountID int64
+	ssoNonce  string // non-empty when login is part of an SSO redirect flow
 }
 
 // pendingWebAuthnCeremonies stores in-flight WebAuthn ceremonies for the UI.
@@ -55,7 +56,7 @@ func cleanupUIWebAuthnCeremonies() {
 	}
 }
 
-func storeUICeremony(session *libwebauthn.SessionData, accountID int64) (string, error) {
+func storeUICeremony(session *libwebauthn.SessionData, accountID int64, ssoNonce string) (string, error) {
 	raw, err := crypto.RandomBytes(webauthnNonceBytes)
 	if err != nil {
 		return "", fmt.Errorf("webauthn: generate ceremony nonce: %w", err)
@@ -64,6 +65,7 @@ func storeUICeremony(session *libwebauthn.SessionData, accountID int64) (string,
 	pendingUIWebAuthnCeremonies.Store(nonce, &webauthnCeremony{
 		session:   session,
 		accountID: accountID,
+		ssoNonce:  ssoNonce,
 		expiresAt: time.Now().Add(webauthnCeremonyTTL),
 	})
 	return nonce, nil
@@ -170,7 +172,7 @@ func (u *UIServer) handleWebAuthnBegin(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	nonce, err := storeUICeremony(session, acct.ID)
+	nonce, err := storeUICeremony(session, acct.ID, "")
 	if err != nil {
 		writeJSONError(w, http.StatusInternalServerError, "internal error")
 		return
@@ -352,6 +354,7 @@ func (u *UIServer) handleWebAuthnLoginBegin(w http.ResponseWriter, r *http.Reque
 	r.Body = http.MaxBytesReader(w, r.Body, maxFormBytes)
 	var req struct {
 		Username string `json:"username"`
+		SSONonce string `json:"sso_nonce"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 		writeJSONError(w, http.StatusBadRequest, "invalid JSON")
@@ -413,7 +416,7 @@ func (u *UIServer) handleWebAuthnLoginBegin(w http.ResponseWriter, r *http.Reque
 		return
 	}
 
-	nonce, err := storeUICeremony(session, accountID)
+	nonce, err := storeUICeremony(session, accountID, req.SSONonce)
 	if err != nil {
 		writeJSONError(w, http.StatusInternalServerError, "internal error")
 		return
@@ -582,6 +585,17 @@ func (u *UIServer) handleWebAuthnLoginFinish(w http.ResponseWriter, r *http.Requ
 
 	_ = u.db.ClearLoginFailures(acct.ID)
 
+	// SSO redirect flow: issue authorization code and return redirect URL as JSON.
+	if ceremony.ssoNonce != "" {
+		if callbackURL, ok := u.buildSSOCallback(r, ceremony.ssoNonce, acct.ID); ok {
+			u.writeAudit(r, model.EventWebAuthnLoginOK, &acct.ID, nil, "")
+			w.Header().Set("Content-Type", "application/json")
+			_ = json.NewEncoder(w).Encode(map[string]string{"redirect": callbackURL})
+			return
+		}
+		// SSO session expired — fall through to normal login.
+	}
+
 	// Issue JWT and set session cookie.
 	expiry := u.cfg.DefaultExpiry()
 	roles, err := u.db.GetRoles(acct.ID)

internal/ui/session.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/token"
+	"git.wntrmute.dev/mc/mcias/internal/token"
 )
 
 // validateSessionToken wraps token.ValidateToken for use by UI session middleware.

internal/ui/ui.go

@@ -27,13 +27,13 @@ import (
 	"sync"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcias/internal/auth"
+	"git.wntrmute.dev/mc/mcias/internal/auth"
-	"git.wntrmute.dev/kyle/mcias/internal/config"
+	"git.wntrmute.dev/mc/mcias/internal/config"
-	"git.wntrmute.dev/kyle/mcias/internal/db"
+	"git.wntrmute.dev/mc/mcias/internal/db"
-	"git.wntrmute.dev/kyle/mcias/internal/middleware"
+	"git.wntrmute.dev/mc/mcias/internal/middleware"
-	"git.wntrmute.dev/kyle/mcias/internal/model"
+	"git.wntrmute.dev/mc/mcias/internal/model"
-	"git.wntrmute.dev/kyle/mcias/internal/vault"
+	"git.wntrmute.dev/mc/mcias/internal/vault"
-	"git.wntrmute.dev/kyle/mcias/web"
+	"git.wntrmute.dev/mc/mcias/web"
 )
 
 const (
@@ -445,6 +445,9 @@ func (u *UIServer) Register(mux *http.ServeMux) {
 	uiMux.HandleFunc("GET /unseal", u.handleUnsealPage)
 	uiMux.Handle("POST /unseal", unsealRateLimit(http.HandlerFunc(u.handleUnsealPost)))
 
+	// SSO authorize route (no session required, rate-limited).
+	uiMux.Handle("GET /sso/authorize", loginRateLimit(http.HandlerFunc(u.handleSSOAuthorize)))
+
 	// Auth routes (no session required).
 	uiMux.HandleFunc("GET /login", u.handleLoginPage)
 	uiMux.Handle("POST /login", loginRateLimit(http.HandlerFunc(u.handleLoginPost)))
@@ -746,8 +749,11 @@ func noDirListing(next http.Handler) http.Handler {
 func securityHeaders(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		h := w.Header()
+		// Security: 'unsafe-hashes' with the htmx swap indicator style hash
+		// allows htmx to apply its settling/swapping CSS transitions without
+		// opening the door to arbitrary inline styles.
 		h.Set("Content-Security-Policy",
-			"default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data:; font-src 'self'")
+			"default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-hashes' 'sha256-bsV5JivYxvGywDAZ22EZJKBFip65Ng9xoJVLbBg7bdo='; img-src 'self' data:; font-src 'self'")
 		h.Set("X-Content-Type-Options", "nosniff")
 		h.Set("X-Frame-Options", "DENY")
 		h.Set("Strict-Transport-Security", "max-age=63072000; includeSubDomains")
@@ -810,6 +816,7 @@ type PageData struct {
 type LoginData struct {
 	Error    string
 	Username string // pre-filled on TOTP step
+	SSONonce string // SSO session nonce (hidden field for SSO redirect flow)
 	// Security (F-02): Password is no longer carried in the HTML form. Instead
 	// a short-lived server-side nonce is issued after successful password
 	// verification, and only the nonce is embedded in the TOTP step form.
@@ -931,11 +938,11 @@ type ProfileData struct { //nolint:govet // fieldalignment: readability over ali
 	WebAuthnEnabled bool
 	// TOTP enrollment fields (populated only during enrollment flow).
 	TOTPEnabled     bool
-	TOTPSecret      string // base32-encoded; shown once during enrollment
+	TOTPSecret      string       // base32-encoded; shown once during enrollment
-	TOTPQR          string // data:image/png;base64,... QR code
+	TOTPQR          template.URL // data:image/png;base64,... QR code; template.URL bypasses URL escaping
-	TOTPEnrollNonce string // single-use nonce for confirm step
+	TOTPEnrollNonce string       // single-use nonce for confirm step
-	TOTPError       string // enrollment-specific error message
+	TOTPError       string       // enrollment-specific error message
-	TOTPSuccess     string // success flash after confirmation
+	TOTPSuccess     string       // success flash after confirmation
 }
 
 // PGCredsData is the view model for the "My PG Credentials" list page.