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Data foundation started, with updated guidelines and
golangci-lint config.

.golangci.yml

@@ -0,0 +1,497 @@
+# This file is licensed under the terms of the MIT license https://opensource.org/license/mit
+# Copyright (c) 2021-2025 Marat Reymers
+
+## Golden config for golangci-lint v2.6.2
+#
+# This is the best config for golangci-lint based on my experience and opinion.
+# It is very strict, but not extremely strict.
+# Feel free to adapt it to suit your needs.
+# If this config helps you, please consider keeping a link to this file (see the next comment).
+
+# Based on https://gist.github.com/maratori/47a4d00457a92aa426dbd48a18776322
+
+version: "2"
+
+issues:
+  # Maximum count of issues with the same text.
+  # Set to 0 to disable.
+  # Default: 3
+  max-same-issues: 50
+
+  # Exclude some lints for CLI programs under cmd/ (package main).
+  # The project allows fmt.Print* in command-line tools; keep forbidigo for libraries.
+  exclude-rules:
+    - path: ^cmd/
+      linters:
+        - forbidigo
+    - path: cmd/.*
+      linters:
+        - forbidigo
+    - path: .*/cmd/.*
+      linters:
+        - forbidigo
+
+formatters:
+  enable:
+    - goimports # checks if the code and import statements are formatted according to the 'goimports' command
+    - golines # checks if code is formatted, and fixes long lines
+
+    ## you may want to enable
+    #- gci # checks if code and import statements are formatted, with additional rules
+    #- gofmt # checks if the code is formatted according to 'gofmt' command
+    #- gofumpt # enforces a stricter format than 'gofmt', while being backwards compatible
+    #- swaggo # formats swaggo comments
+
+  # All settings can be found here https://github.com/golangci/golangci-lint/blob/HEAD/.golangci.reference.yml
+  settings:
+    goimports:
+      # A list of prefixes, which, if set, checks import paths
+      # with the given prefixes are grouped after 3rd-party packages.
+      # Default: []
+      local-prefixes:
+        - github.com/my/project
+
+    golines:
+      # Target maximum line length.
+      # Default: 100
+      max-len: 120
+
+linters:
+  enable:
+    - asasalint # checks for pass []any as any in variadic func(...any)
+    - asciicheck # checks that your code does not contain non-ASCII identifiers
+    - bidichk # checks for dangerous unicode character sequences
+    - bodyclose # checks whether HTTP response body is closed successfully
+    - canonicalheader # checks whether net/http.Header uses canonical header
+    - copyloopvar # detects places where loop variables are copied (Go 1.22+)
+    - cyclop # checks function and package cyclomatic complexity
+    - depguard # checks if package imports are in a list of acceptable packages
+    - dupl # tool for code clone detection
+    - durationcheck # checks for two durations multiplied together
+    - errcheck # checking for unchecked errors, these unchecked errors can be critical bugs in some cases
+    - errname # checks that sentinel errors are prefixed with the Err and error types are suffixed with the Error
+    - errorlint # finds code that will cause problems with the error wrapping scheme introduced in Go 1.13
+    - exhaustive # checks exhaustiveness of enum switch statements
+    - exptostd # detects functions from golang.org/x/exp/ that can be replaced by std functions
+    - fatcontext # detects nested contexts in loops
+    - forbidigo # forbids identifiers
+    - funcorder # checks the order of functions, methods, and constructors
+    - funlen # tool for detection of long functions
+    - gocheckcompilerdirectives # validates go compiler directive comments (//go:)
+    - gochecksumtype # checks exhaustiveness on Go "sum types"
+    - gocognit # computes and checks the cognitive complexity of functions
+    - goconst # finds repeated strings that could be replaced by a constant
+    - gocritic # provides diagnostics that check for bugs, performance and style issues
+    - gocyclo # computes and checks the cyclomatic complexity of functions
+    - godoclint # checks Golang's documentation practice
+    - godot # checks if comments end in a period
+    - gomoddirectives # manages the use of 'replace', 'retract', and 'excludes' directives in go.mod
+    - gosec # inspects source code for security problems
+    - govet # reports suspicious constructs, such as Printf calls whose arguments do not align with the format string
+    - iface # checks the incorrect use of interfaces, helping developers avoid interface pollution
+    - ineffassign # detects when assignments to existing variables are not used
+    - intrange # finds places where for loops could make use of an integer range
+    - iotamixing # checks if iotas are being used in const blocks with other non-iota declarations
+    - loggercheck # checks key value pairs for common logger libraries (kitlog,klog,logr,zap)
+    - makezero # finds slice declarations with non-zero initial length
+    - mirror # reports wrong mirror patterns of bytes/strings usage
+    - mnd # detects magic numbers
+    - modernize # suggests simplifications to Go code, using modern language and library features
+    - musttag # enforces field tags in (un)marshaled structs
+    - nakedret # finds naked returns in functions greater than a specified function length
+    - nestif # reports deeply nested if statements
+    - nilerr # finds the code that returns nil even if it checks that the error is not nil
+    - nilnesserr # reports that it checks for err != nil, but it returns a different nil value error (powered by nilness and nilerr)
+    - nilnil # checks that there is no simultaneous return of nil error and an invalid value
+    - noctx # finds sending http request without context.Context
+    - nolintlint # reports ill-formed or insufficient nolint directives
+    - nonamedreturns # reports all named returns
+    - nosprintfhostport # checks for misuse of Sprintf to construct a host with port in a URL
+    - perfsprint # checks that fmt.Sprintf can be replaced with a faster alternative
+    - predeclared # finds code that shadows one of Go's predeclared identifiers
+    - promlinter # checks Prometheus metrics naming via promlint
+    - protogetter # reports direct reads from proto message fields when getters should be used
+    - reassign # checks that package variables are not reassigned
+    - recvcheck # checks for receiver type consistency
+    - revive # fast, configurable, extensible, flexible, and beautiful linter for Go, drop-in replacement of golint
+    - rowserrcheck # checks whether Err of rows is checked successfully
+    - sloglint # ensure consistent code style when using log/slog
+    - spancheck # checks for mistakes with OpenTelemetry/Census spans
+    - sqlclosecheck # checks that sql.Rows and sql.Stmt are closed
+    - staticcheck # is a go vet on steroids, applying a ton of static analysis checks
+    - testableexamples # checks if examples are testable (have an expected output)
+    - testifylint # checks usage of github.com/stretchr/testify
+    - testpackage # makes you use a separate _test package
+    - tparallel # detects inappropriate usage of t.Parallel() method in your Go test codes
+    - unconvert # removes unnecessary type conversions
+    - unparam # reports unused function parameters
+    - unqueryvet # detects SELECT * in SQL queries and SQL builders, encouraging explicit column selection
+    - unused # checks for unused constants, variables, functions and types
+    - usestdlibvars # detects the possibility to use variables/constants from the Go standard library
+    - usetesting # reports uses of functions with replacement inside the testing package
+    - wastedassign # finds wasted assignment statements
+    - whitespace # detects leading and trailing whitespace
+
+    ## you may want to enable
+    #- arangolint # opinionated best practices for arangodb client
+    #- decorder # checks declaration order and count of types, constants, variables and functions
+    #- exhaustruct # [highly recommend to enable] checks if all structure fields are initialized
+    #- ginkgolinter # [if you use ginkgo/gomega] enforces standards of using ginkgo and gomega
+    #- godox # detects usage of FIXME, TODO and other keywords inside comments
+    #- goheader # checks is file header matches to pattern
+    #- inamedparam # [great idea, but too strict, need to ignore a lot of cases by default] reports interfaces with unnamed method parameters
+    #- interfacebloat # checks the number of methods inside an interface
+    #- ireturn # accept interfaces, return concrete types
+    #- noinlineerr # disallows inline error handling `if err := ...; err != nil {`
+    #- prealloc # [premature optimization, but can be used in some cases] finds slice declarations that could potentially be preallocated
+    #- tagalign # checks that struct tags are well aligned
+    #- varnamelen # [great idea, but too many false positives] checks that the length of a variable's name matches its scope
+    #- wrapcheck # checks that errors returned from external packages are wrapped
+    #- zerologlint # detects the wrong usage of zerolog that a user forgets to dispatch zerolog.Event
+
+    ## disabled
+    #- containedctx # detects struct contained context.Context field
+    #- contextcheck # [too many false positives] checks the function whether use a non-inherited context
+    #- dogsled # checks assignments with too many blank identifiers (e.g. x, _, _, _, := f())
+    #- dupword # [useless without config] checks for duplicate words in the source code
+    #- err113 # [too strict] checks the errors handling expressions
+    #- errchkjson # [don't see profit + I'm against of omitting errors like in the first example https://github.com/breml/errchkjson] checks types passed to the json encoding functions. Reports unsupported types and optionally reports occasions, where the check for the returned error can be omitted
+    #- forcetypeassert # [replaced by errcheck] finds forced type assertions
+    #- gomodguard # [use more powerful depguard] allow and block lists linter for direct Go module dependencies
+    #- gosmopolitan # reports certain i18n/l10n anti-patterns in your Go codebase
+    #- grouper # analyzes expression groups
+    #- importas # enforces consistent import aliases
+    #- lll # [replaced by golines] reports long lines
+    #- maintidx # measures the maintainability index of each function
+    #- misspell # [useless] finds commonly misspelled English words in comments
+    #- nlreturn # [too strict and mostly code is not more readable] checks for a new line before return and branch statements to increase code clarity
+    #- paralleltest # [too many false positives] detects missing usage of t.Parallel() method in your Go test
+    #- tagliatelle # checks the struct tags
+    #- thelper # detects golang test helpers without t.Helper() call and checks the consistency of test helpers
+    #- wsl # [too strict and mostly code is not more readable] whitespace linter forces you to use empty lines
+    #- wsl_v5 # [too strict and mostly code is not more readable] add or remove empty lines
+
+  # All settings can be found here https://github.com/golangci/golangci-lint/blob/HEAD/.golangci.reference.yml
+  settings:
+    cyclop:
+      # The maximal code complexity to report.
+      # Default: 10
+      max-complexity: 30
+      # The maximal average package complexity.
+      # If it's higher than 0.0 (float) the check is enabled.
+      # Default: 0.0
+      package-average: 10.0
+
+    depguard:
+      # Rules to apply.
+      #
+      # Variables:
+      # - File Variables
+      #   Use an exclamation mark `!` to negate a variable.
+      #   Example: `!$test` matches any file that is not a go test file.
+      #
+      #   `$all` - matches all go files
+      #   `$test` - matches all go test files
+      #
+      # - Package Variables
+      #
+      #   `$gostd` - matches all of go's standard library (Pulled from `GOROOT`)
+      #
+      # Default (applies if no custom rules are defined): Only allow $gostd in all files.
+      rules:
+        "deprecated":
+          # List of file globs that will match this list of settings to compare against.
+          # By default, if a path is relative, it is relative to the directory where the golangci-lint command is executed.
+          # The placeholder '${base-path}' is substituted with a path relative to the mode defined with `run.relative-path-mode`.
+          # The placeholder '${config-path}' is substituted with a path relative to the configuration file.
+          # Default: $all
+          files:
+            - "$all"
+          # List of packages that are not allowed.
+          # Entries can be a variable (starting with $), a string prefix, or an exact match (if ending with $).
+          # Default: []
+          deny:
+            - pkg: github.com/golang/protobuf
+              desc: Use google.golang.org/protobuf instead, see https://developers.google.com/protocol-buffers/docs/reference/go/faq#modules
+            - pkg: github.com/satori/go.uuid
+              desc: Use github.com/google/uuid instead, satori's package is not maintained
+            - pkg: github.com/gofrs/uuid$
+              desc: Use github.com/gofrs/uuid/v5 or later, it was not a go module before v5
+        "non-test files":
+          files:
+            - "!$test"
+          deny:
+            - pkg: math/rand$
+              desc: Use math/rand/v2 instead, see https://go.dev/blog/randv2
+        "non-main files":
+          files:
+            - "!**/main.go"
+          deny:
+            - pkg: log$
+              desc: Use log/slog instead, see https://go.dev/blog/slog
+
+    embeddedstructfieldcheck:
+      # Checks that sync.Mutex and sync.RWMutex are not used as embedded fields.
+      # Default: false
+      forbid-mutex: true
+
+    errcheck:
+      # Report about not checking of errors in type assertions: `a := b.(MyStruct)`.
+      # Such cases aren't reported by default.
+      # Default: false
+      check-type-assertions: true
+      exclude-functions:
+        - (*git.wntrmute.dev/kyle/goutils/sbuf.Buffer).Write
+        - git.wntrmute.dev/kyle/goutils/lib.Warn
+        - git.wntrmute.dev/kyle/goutils/lib.Warnx
+        - git.wntrmute.dev/kyle/goutils/lib.Err
+        - git.wntrmute.dev/kyle/goutils/lib.Errx
+
+    exhaustive:
+      # Program elements to check for exhaustiveness.
+      # Default: [ switch ]
+      check:
+        - switch
+        - map
+
+    exhaustruct:
+      # List of regular expressions to match type names that should be excluded from processing.
+      # Anonymous structs can be matched by '<anonymous>' alias.
+      # Has precedence over `include`.
+      # Each regular expression must match the full type name, including package path.
+      # For example, to match type `net/http.Cookie` regular expression should be `.*/http\.Cookie`,
+      # but not `http\.Cookie`.
+      # Default: []
+      exclude:
+        # std libs
+        - ^net/http.Client$
+        - ^net/http.Cookie$
+        - ^net/http.Request$
+        - ^net/http.Response$
+        - ^net/http.Server$
+        - ^net/http.Transport$
+        - ^net/url.URL$
+        - ^os/exec.Cmd$
+        - ^reflect.StructField$
+        # public libs
+        - ^github.com/Shopify/sarama.Config$
+        - ^github.com/Shopify/sarama.ProducerMessage$
+        - ^github.com/mitchellh/mapstructure.DecoderConfig$
+        - ^github.com/prometheus/client_golang/.+Opts$
+        - ^github.com/spf13/cobra.Command$
+        - ^github.com/spf13/cobra.CompletionOptions$
+        - ^github.com/stretchr/testify/mock.Mock$
+        - ^github.com/testcontainers/testcontainers-go.+Request$
+        - ^github.com/testcontainers/testcontainers-go.FromDockerfile$
+        - ^golang.org/x/tools/go/analysis.Analyzer$
+        - ^google.golang.org/protobuf/.+Options$
+        - ^gopkg.in/yaml.v3.Node$
+      # Allows empty structures in return statements.
+      # Default: false
+      allow-empty-returns: true
+
+    funcorder:
+      # Checks if the exported methods of a structure are placed before the non-exported ones.
+      # Default: true
+      struct-method: false
+
+    funlen:
+      # Checks the number of lines in a function.
+      # If lower than 0, disable the check.
+      # Default: 60
+      lines: 100
+      # Checks the number of statements in a function.
+      # If lower than 0, disable the check.
+      # Default: 40
+      statements: 50
+
+    gochecksumtype:
+      # Presence of `default` case in switch statements satisfies exhaustiveness, if all members are not listed.
+      # Default: true
+      default-signifies-exhaustive: false
+
+    gocognit:
+      # Minimal code complexity to report.
+      # Default: 30 (but we recommend 10-20)
+      min-complexity: 20
+
+    gocritic:
+      # Settings passed to gocritic.
+      # The settings key is the name of a supported gocritic checker.
+      # The list of supported checkers can be found at https://go-critic.com/overview.
+      settings:
+        captLocal:
+          # Whether to restrict checker to params only.
+          # Default: true
+          paramsOnly: false
+        underef:
+          # Whether to skip (*x).method() calls where x is a pointer receiver.
+          # Default: true
+          skipRecvDeref: false
+
+    godoclint:
+      # List of rules to enable in addition to the default set.
+      # Default: empty
+      enable:
+        # Assert no unused link in godocs.
+        # https://github.com/godoc-lint/godoc-lint?tab=readme-ov-file#no-unused-link
+        - no-unused-link
+
+    gosec:
+      excludes:
+        - G104 # handled by errcheck
+        - G301
+        - G306
+
+    govet:
+      # Enable all analyzers.
+      # Default: false
+      enable-all: true
+      # Disable analyzers by name.
+      # Run `GL_DEBUG=govet golangci-lint run --enable=govet` to see default, all available analyzers, and enabled analyzers.
+      # Default: []
+      disable:
+        - fieldalignment # too strict
+      # Settings per analyzer.
+      settings:
+        shadow:
+          # Whether to be strict about shadowing; can be noisy.
+          # Default: false
+          strict: true
+
+    inamedparam:
+      # Skips check for interface methods with only a single parameter.
+      # Default: false
+      skip-single-param: true
+
+    mnd:
+      ignored-functions:
+        - args.Error
+        - flag.Arg
+        - flag.Duration.*
+        - flag.Float.*
+        - flag.Int.*
+        - flag.Uint.*
+        - os.Chmod
+        - os.Mkdir.*
+        - os.OpenFile
+        - os.WriteFile
+        - prometheus.ExponentialBuckets.*
+        - prometheus.LinearBuckets
+      ignored-numbers:
+        - 1
+        - 2
+        - 3
+        - 4
+        - 8
+
+    nakedret:
+      # Make an issue if func has more lines of code than this setting, and it has naked returns.
+      # Default: 30
+      max-func-lines: 0
+
+    nolintlint:
+      # Exclude the following linters from requiring an explanation.
+      # Default: []
+      allow-no-explanation: [ funlen, gocognit, golines ]
+      # Enable to require an explanation of nonzero length after each nolint directive.
+      # Default: false
+      require-explanation: true
+      # Enable to require nolint directives to mention the specific linter being suppressed.
+      # Default: false
+      require-specific: true
+
+    perfsprint:
+      # Optimizes into strings concatenation.
+      # Default: true
+      strconcat: false
+
+    reassign:
+      # Patterns for global variable names that are checked for reassignment.
+      # See https://github.com/curioswitch/go-reassign#usage
+      # Default: ["EOF", "Err.*"]
+      patterns:
+        - ".*"
+
+    rowserrcheck:
+      # database/sql is always checked.
+      # Default: []
+      packages:
+        - github.com/jmoiron/sqlx
+
+    sloglint:
+      # Enforce not using global loggers.
+      # Values:
+      # - "": disabled
+      # - "all": report all global loggers
+      # - "default": report only the default slog logger
+      # https://github.com/go-simpler/sloglint?tab=readme-ov-file#no-global
+      # Default: ""
+      no-global: all
+      # Enforce using methods that accept a context.
+      # Values:
+      # - "": disabled
+      # - "all": report all contextless calls
+      # - "scope": report only if a context exists in the scope of the outermost function
+      # https://github.com/go-simpler/sloglint?tab=readme-ov-file#context-only
+      # Default: ""
+      context: scope
+
+    staticcheck:
+      # SAxxxx checks in https://staticcheck.dev/docs/configuration/options/#checks
+      # Example (to disable some checks): [ "all", "-SA1000", "-SA1001"]
+      # Default: ["all", "-ST1000", "-ST1003", "-ST1016", "-ST1020", "-ST1021", "-ST1022"]
+      checks:
+        - all
+        # Incorrect or missing package comment.
+        # https://staticcheck.dev/docs/checks/#ST1000
+        - -ST1000
+        # Use consistent method receiver names.
+        # https://staticcheck.dev/docs/checks/#ST1016
+        - -ST1016
+        # Omit embedded fields from selector expression.
+        # https://staticcheck.dev/docs/checks/#QF1008
+        - -QF1008
+        # We often explicitly enable old/deprecated ciphers for research.
+        - -SA1019
+
+    usetesting:
+      # Enable/disable `os.TempDir()` detections.
+      # Default: false
+      os-temp-dir: true
+
+  exclusions:
+    # Log a warning if an exclusion rule is unused.
+    # Default: false
+    warn-unused: true
+    # Predefined exclusion rules.
+    # Default: []
+    presets:
+      - std-error-handling
+      - common-false-positives
+    rules:
+      - path: 'main.go'
+        linters: [ forbidigo, mnd, reassign ]
+      - source: 'TODO'
+        linters: [ godot ]
+      - text: 'should have a package comment'
+        linters: [ revive ]
+      - text: 'exported \S+ \S+ should have comment( \(or a comment on this block\))? or be unexported'
+        linters: [ revive ]
+      - text: 'package comment should be of the form ".+"'
+        source: '// ?(nolint|TODO)'
+        linters: [ revive ]
+      - text: 'comment on exported \S+ \S+ should be of the form ".+"'
+        source: '// ?(nolint|TODO)'
+        linters: [ revive, staticcheck ]
+      - path: '_test\.go'
+        linters:
+          - bodyclose
+          - dupl
+          - errcheck
+          - funlen
+          - goconst
+          - gosec
+          - noctx
+          - reassign
+          - wrapcheck

.junie/guidelines.md

@@ -24,7 +24,7 @@ apps that I write.
   the role named the same as a service account can issue tokens for that
   service account.
 - Admin users can also revoke tokens for a service account.
-- Service accounts (and users with the a role named the same as the
+- Service accounts (and users with a role named the same as the
   service account) can also retrieve Postgres database credentials for
   the service account.
 
@@ -41,10 +41,13 @@ apps that I write.
 
 - The primary interface will be an REST API over HTTPS. TLS security is
   critical for this.
-- There should be two command line tools associated with MCIAS:
+- There should be a single command line program using cobra/viper. It offers the following subcommands:
-    - mciassrv is the authentication server.
+  - `db`: manage database credentials.
-    - mciasctl is the tool for admins to create and manage accounts, issue
+  - `role`: manage roles.
-      or revoke tokens, and manage postgres database credentials.
+  - `server`: run the server.
+  - `token`: obtain a token for a service account.
+  - `user`: manage users.
+
 
 ## Structure
 

data/totp.go

@@ -0,0 +1,47 @@
+package data
+
+import (
+	"strings"
+	"time"
+
+	twofactor "git.wntrmute.dev/kyle/goutils/twofactor"
+)
+
+const totpPeriod = 30
+
+// builtinTOTPValidator delegates TOTP validation to goutils/twofactor.
+type builtinTOTPValidator struct{}
+
+func (builtinTOTPValidator) Validate(secret, code string, at time.Time, window int) bool {
+	if secret == "" || code == "" {
+		return false
+	}
+	// Normalize secret similar to common authenticator apps: remove spaces and uppercase.
+	norm := strings.ToUpper(strings.ReplaceAll(secret, " ", ""))
+	norm = twofactor.Pad(norm)
+	otp, err := twofactor.NewGoogleTOTP(norm)
+	if err != nil || otp == nil {
+		return false
+	}
+
+	// Compute the base counter for the provided time (period 30s, start 0).
+	base := uint64(at.Unix()&unsignedMask64) / totpPeriod // #nosec G115 - masked off overflow
+	// Check +/- window steps.
+	for i := -window; i <= window; i++ {
+		var ctr uint64
+		if i < 0 {
+			// Guard underflow.
+			offs := uint64(-i)
+			if offs > base {
+				continue
+			}
+			ctr = base - offs
+		} else {
+			ctr = base + uint64(i)
+		}
+		if otp.OATH.OTP(ctr) == code {
+			return true
+		}
+	}
+	return false
+}

data/types.go

@@ -0,0 +1,14 @@
+package data
+
+const (
+	unsignedMask64 = 0x7FFFFFFF
+)
+
+// DBCredentials holds generated database access parameters for a service account.
+type DBCredentials struct {
+	Username string
+	Password string
+	Database string
+	Host     string
+	Port     int
+}

data/user.go

@@ -0,0 +1,160 @@
+package data
+
+import (
+	"crypto/rand"
+	"crypto/subtle"
+	"encoding/base64"
+	"errors"
+	"strconv"
+	"time"
+
+	"golang.org/x/crypto/scrypt"
+)
+
+// AccountType distinguishes human users from system/service accounts.
+type AccountType string
+
+const (
+	AccountHuman  AccountType = "human"
+	AccountSystem AccountType = "system"
+)
+
+// User represents an identity in the system. It supports password and optional TOTP.
+type User struct {
+	ID       string
+	Username string
+	Type     AccountType
+	Roles    []string
+
+	// Password hashing material
+	pwdHash []byte
+	pwdSalt []byte
+
+	// Base32 encoded TOTP secret (RFC 3548). Empty means TOTP disabled.
+	TOTPSecret string
+}
+
+// Scrypt parameters. Chosen for interactive logins; can be tuned later.
+const (
+	scryptN = 1 << 15 // 32768
+	scryptR = 8
+	scryptP = 1
+	keyLen  = 32
+	saltLen = 16
+)
+
+// SetPassword hashes and stores the provided password using scrypt with a random salt.
+func (u *User) SetPassword(password string) error {
+	if password == "" {
+		return errors.New("password cannot be empty")
+	}
+	salt := make([]byte, saltLen)
+	if _, err := rand.Read(salt); err != nil {
+		return err
+	}
+	dk, err := scrypt.Key([]byte(password), salt, scryptN, scryptR, scryptP, keyLen)
+	if err != nil {
+		return err
+	}
+	u.pwdSalt = salt
+	u.pwdHash = dk
+	return nil
+}
+
+// CheckPassword verifies a plaintext password against the stored scrypt hash.
+func (u *User) CheckPassword(password string) bool {
+	if len(u.pwdSalt) == 0 || len(u.pwdHash) == 0 {
+		return false
+	}
+	dk, err := scrypt.Key([]byte(password), u.pwdSalt, scryptN, scryptR, scryptP, keyLen)
+	if err != nil {
+		return false
+	}
+	return subtle.ConstantTimeCompare(dk, u.pwdHash) == 1
+}
+
+// PasswordHash returns a portable string representation of the scrypt hash and salt.
+// The format is: scrypt:N:r:p:base64(salt):base64(hash).
+func (u *User) PasswordHash() string {
+	if len(u.pwdSalt) == 0 || len(u.pwdHash) == 0 {
+		return ""
+	}
+	return "scrypt:" +
+		strconv.Itoa(scryptN) + ":" + strconv.Itoa(scryptR) + ":" + strconv.Itoa(scryptP) + ":" +
+		base64.RawStdEncoding.EncodeToString(u.pwdSalt) + ":" +
+		base64.RawStdEncoding.EncodeToString(u.pwdHash)
+}
+
+const passwordHashParts = 5
+
+// LoadPasswordHash parses the value produced by PasswordHash and loads it into the user.
+func (u *User) LoadPasswordHash(s string) error {
+	if s == "" {
+		u.pwdSalt = nil
+		u.pwdHash = nil
+		return nil
+	}
+	const prefix = "scrypt:"
+	if len(s) < len(prefix) || s[:len(prefix)] != prefix {
+		return errors.New("unsupported password hash format")
+	}
+	parts := splitN(s[len(prefix):], ':', passwordHashParts)
+	if len(parts) != passwordHashParts {
+		return errors.New("invalid password hash")
+	}
+	// We currently ignore parsed N,r,p and use compiled constants to avoid variable-time params.
+	salt, err := base64.RawStdEncoding.DecodeString(parts[3])
+	if err != nil {
+		return err
+	}
+	hash, err := base64.RawStdEncoding.DecodeString(parts[4])
+	if err != nil {
+		return err
+	}
+	if len(hash) != keyLen {
+		return errors.New("invalid hash length")
+	}
+	u.pwdSalt = salt
+	u.pwdHash = hash
+	return nil
+}
+
+// VerifyTOTP checks a TOTP code for the user's TOTP secret. If no secret is set, it fails.
+// The window parameter defines the allowed step skew (+/- window steps).
+func (u *User) VerifyTOTP(code string, at time.Time, window int) bool {
+	if u.TOTPSecret == "" || code == "" {
+		return false
+	}
+	return defaultTOTPValidator.Validate(u.TOTPSecret, code, at, window)
+}
+
+// TOTPValidator abstracts TOTP verification to allow swapping implementations.
+type TOTPValidator interface {
+	Validate(secret, code string, at time.Time, window int) bool
+}
+
+var defaultTOTPValidator TOTPValidator = builtinTOTPValidator{}
+
+// splitN is like strings.SplitN but without importing another package here.
+func splitN(s string, sep rune, n int) []string {
+	if n <= 0 {
+		return nil
+	}
+	out := make([]string, 0, n)
+	start := 0
+	count := 1
+	for i, r := range s {
+		if r == sep {
+			out = append(out, s[start:i])
+			start = i + 1
+			count++
+			if count == n {
+				break
+			}
+		}
+	}
+	if start <= len(s) {
+		out = append(out, s[start:])
+	}
+	return out
+}

data/user_test.go

@@ -0,0 +1,49 @@
+package data_test
+
+import (
+	"testing"
+	"time"
+
+	"git.wntrmute.dev/kyle/mcias/data"
+)
+
+func TestPasswordSetAndCheck(t *testing.T) {
+	var u data.User
+	if err := u.SetPassword("s3cret!"); err != nil {
+		t.Fatalf("SetPassword error: %v", err)
+	}
+	if !u.CheckPassword("s3cret!") {
+		t.Fatal("expected password to verify")
+	}
+	if u.CheckPassword("wrong") {
+		t.Fatal("expected wrong password to fail")
+	}
+	// Round-trip hash string
+	hs := u.PasswordHash()
+	if hs == "" {
+		t.Fatal("expected non-empty password hash string")
+	}
+	var u2 data.User
+	if err := u2.LoadPasswordHash(hs); err != nil {
+		t.Fatalf("LoadPasswordHash error: %v", err)
+	}
+	if !u2.CheckPassword("s3cret!") {
+		t.Fatal("expected password to verify after LoadPasswordHash")
+	}
+}
+
+func TestTOTPValidationKnownVector(t *testing.T) {
+	// From RFC 6238 test secret (base32): "GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ"
+	// Using T0=0, step=30. For SHA1, at 59s, code should be 94287082 -> 6-digit 287082.
+	u := data.User{TOTPSecret: "GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ"}
+	ts := time.Unix(59, 0)
+	if !u.VerifyTOTP("287082", ts, 0) {
+		t.Fatal("expected TOTP code to verify for known vector")
+	}
+	if u.VerifyTOTP("287082", ts.Add(30*time.Second), 0) {
+		t.Fatal("expected code to fail outside time step with zero window")
+	}
+	if !u.VerifyTOTP("287082", ts.Add(30*time.Second), 1) {
+		t.Fatal("expected code to verify within window=1")
+	}
+}

go.mod

@@ -1,37 +1,13 @@
 module git.wntrmute.dev/kyle/mcias
 
-go 1.23.8
+go 1.24.0
-
-require github.com/gokyle/twofactor v1.0.1
 
 require (
-	github.com/Masterminds/squirrel v1.5.4 // indirect
+	git.wntrmute.dev/kyle/goutils v1.12.1
-	github.com/cloudflare/golz4 v0.0.0-20240921210912-c4df3fe31cbd // indirect
+	golang.org/x/crypto v0.44.0
-	github.com/fsnotify/fsnotify v1.8.0 // indirect
+)
-	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
+
-	github.com/golang-migrate/migrate/v4 v4.18.3 // indirect
+require (
-	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/benbjohnson/clock v1.3.5 // indirect
-	github.com/hashicorp/go-multierror v1.1.1 // indirect
-	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 // indirect
-	github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 // indirect
-	github.com/mattn/go-sqlite3 v1.14.28 // indirect
-	github.com/oklog/ulid/v2 v2.1.0 // indirect
-	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
-	github.com/sagikazarmark/locafero v0.7.0 // indirect
-	github.com/sourcegraph/conc v0.3.0 // indirect
-	github.com/spf13/afero v1.12.0 // indirect
-	github.com/spf13/cast v1.7.1 // indirect
-	github.com/spf13/cobra v1.9.1 // indirect
-	github.com/spf13/pflag v1.0.6 // indirect
-	github.com/spf13/viper v1.20.1 // indirect
-	github.com/subosito/gotenv v1.6.0 // indirect
-	go.uber.org/atomic v1.11.0 // indirect
-	go.uber.org/multierr v1.9.0 // indirect
-	golang.org/x/crypto v0.38.0 // indirect
-	golang.org/x/sys v0.33.0 // indirect
-	golang.org/x/text v0.25.0 // indirect
-	golang.org/x/time v0.12.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 	rsc.io/qr v0.2.0 // indirect
 )

go.sum

@@ -1,73 +1,8 @@
-github.com/Masterminds/squirrel v1.5.4 h1:uUcX/aBc8O7Fg9kaISIUsHXdKuqehiXAMQTYX8afzqM=
+git.wntrmute.dev/kyle/goutils v1.12.1 h1:Isho6iaaYW2bi0TU5avFwUOMiYWFqQhm73gROaEKDxU=
-github.com/Masterminds/squirrel v1.5.4/go.mod h1:NNaOrjSoIDfDA40n7sr2tPNZRfjzjA400rg+riTZj10=
+git.wntrmute.dev/kyle/goutils v1.12.1/go.mod h1:PtzS8SdvFz08hUuZ0MKJpogvUApbTTW27PJn1u7sI14=
-github.com/cloudflare/golz4 v0.0.0-20240921210912-c4df3fe31cbd h1:r6CfhFeB1zJY9UVvmsDyFxwJIKXLcmps03FlEs460zI=
+github.com/benbjohnson/clock v1.3.5 h1:VvXlSJBzZpA/zum6Sj74hxwYI2DIxRWuNIoXAzHZz5o=
-github.com/cloudflare/golz4 v0.0.0-20240921210912-c4df3fe31cbd/go.mod h1:EOBUe0h4xcZ5GoxqC5SDxFQ8gwyZPKQoEzownBlhI80=
+github.com/benbjohnson/clock v1.3.5/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
-github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+golang.org/x/crypto v0.44.0 h1:A97SsFvM3AIwEEmTBiaxPPTYpDC47w720rdiiUvgoAU=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+golang.org/x/crypto v0.44.0/go.mod h1:013i+Nw79BMiQiMsOPcVCB5ZIJbYkerPrGnOa00tvmc=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fsnotify/fsnotify v1.8.0 h1:dAwr6QBTBZIkG8roQaJjGof0pp0EeF+tNV7YBP3F/8M=
-github.com/fsnotify/fsnotify v1.8.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
-github.com/go-viper/mapstructure/v2 v2.2.1 h1:ZAaOCxANMuZx5RCeg0mBdEZk7DZasvvZIxtHqx8aGss=
-github.com/go-viper/mapstructure/v2 v2.2.1/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
-github.com/gokyle/twofactor v1.0.1 h1:uRhvx0S4Hb82RPIDALnf7QxbmPL49LyyaCkJDpWx+Ek=
-github.com/gokyle/twofactor v1.0.1/go.mod h1:4gxzH1eaE/F3Pct/sCDNOylP0ClofUO5j4XZN9tKtLE=
-github.com/golang-migrate/migrate/v4 v4.18.3 h1:EYGkoOsvgHHfm5U/naS1RP/6PL/Xv3S4B/swMiAmDLs=
-github.com/golang-migrate/migrate/v4 v4.18.3/go.mod h1:99BKpIi6ruaaXRM1A77eqZ+FWPQ3cfRa+ZVy5bmWMaY=
-github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
-github.com/hashicorp/errwrap v1.1.0 h1:OxrOeh75EUXMY8TBjag2fzXGZ40LB6IKw45YeGUDY2I=
-github.com/hashicorp/errwrap v1.1.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
-github.com/hashicorp/go-multierror v1.1.1 h1:H5DkEtf6CXdFp0N0Em5UCwQpXMWke8IA0+lD48awMYo=
-github.com/hashicorp/go-multierror v1.1.1/go.mod h1:iw975J/qwKPdAO1clOe2L8331t/9/fmwbPZ6JB6eMoM=
-github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
-github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
-github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 h1:SOEGU9fKiNWd/HOJuq6+3iTQz8KNCLtVX6idSoTLdUw=
-github.com/lann/builder v0.0.0-20180802200727-47ae307949d0/go.mod h1:dXGbAdH5GtBTC4WfIxhKZfyBF/HBFgRZSWwZ9g/He9o=
-github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 h1:P6pPBnrTSX3DEVR4fDembhRWSsG5rVo6hYhAB/ADZrk=
-github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0/go.mod h1:vmVJ0l/dxyfGW6FmdpVm2joNMFikkuWg0EoCKLGUMNw=
-github.com/mattn/go-sqlite3 v1.14.28 h1:ThEiQrnbtumT+QMknw63Befp/ce/nUPgBPMlRFEum7A=
-github.com/mattn/go-sqlite3 v1.14.28/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
-github.com/oklog/ulid/v2 v2.1.0 h1:+9lhoxAP56we25tyYETBBY1YLA2SaoLvUFgrP2miPJU=
-github.com/oklog/ulid/v2 v2.1.0/go.mod h1:rcEKHmBBKfef9DhnvX7y1HZBYxjXb0cP5ExxNsTT1QQ=
-github.com/pborman/getopt v0.0.0-20170112200414-7148bc3a4c30/go.mod h1:85jBQOZwpVEaDAr341tbn15RS4fCAsIst0qp7i8ex1o=
-github.com/pelletier/go-toml/v2 v2.2.3 h1:YmeHyLY8mFWbdkNWwpr+qIL2bEqT0o95WSdkNHvL12M=
-github.com/pelletier/go-toml/v2 v2.2.3/go.mod h1:MfCQTFTvCcUyyvvwm1+G6H/jORL20Xlb6rzQu9GuUkc=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/sagikazarmark/locafero v0.7.0 h1:5MqpDsTGNDhY8sGp0Aowyf0qKsPrhewaLSsFaodPcyo=
-github.com/sagikazarmark/locafero v0.7.0/go.mod h1:2za3Cg5rMaTMoG/2Ulr9AwtFaIppKXTRYnozin4aB5k=
-github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=
-github.com/sourcegraph/conc v0.3.0/go.mod h1:Sdozi7LEKbFPqYX2/J+iBAM6HpqSLTASQIKqDmF7Mt0=
-github.com/spf13/afero v1.12.0 h1:UcOPyRBYczmFn6yvphxkn9ZEOY65cpwGKb5mL36mrqs=
-github.com/spf13/afero v1.12.0/go.mod h1:ZTlWwG4/ahT8W7T0WQ5uYmjI9duaLQGy3Q2OAl4sk/4=
-github.com/spf13/cast v1.7.1 h1:cuNEagBQEHWN1FnbGEjCXL2szYEXqfJPbP2HNUaca9Y=
-github.com/spf13/cast v1.7.1/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
-github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo=
-github.com/spf13/cobra v1.9.1/go.mod h1:nDyEzZ8ogv936Cinf6g1RU9MRY64Ir93oCnqb9wxYW0=
-github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
-github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
-github.com/spf13/viper v1.20.1 h1:ZMi+z/lvLyPSCoNtFCpqjy0S4kPbirhpTMwl8BkW9X4=
-github.com/spf13/viper v1.20.1/go.mod h1:P9Mdzt1zoHIG8m2eZQinpiBjo6kCmZSKBClNNqjJvu4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
-github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
-go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
-go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
-go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
-go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
-go.uber.org/multierr v1.9.0 h1:7fIwc/ZtS0q++VgcfqFDxSBZVv/Xo49/SYnDFupUwlI=
-go.uber.org/multierr v1.9.0/go.mod h1:X2jQV1h+kxSjClGpnseKVIxpmcjrj7MNnI0bnlfKTVQ=
-golang.org/x/crypto v0.38.0 h1:jt+WWG8IZlBnVbomuhg2Mdq0+BBQaHbtqHEFEigjUV8=
-golang.org/x/crypto v0.38.0/go.mod h1:MvrbAqul58NNYPKnOra203SB9vpuZW0e+RRZV+Ggqjw=
-golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
-golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/text v0.25.0 h1:qVyWApTSYLk/drJRO5mDlNYskwQznZmkpV2c8q9zls4=
-golang.org/x/text v0.25.0/go.mod h1:WEdwpYrmk1qmdHvhkSTNPm3app7v4rsT8F2UD6+VHIA=
-golang.org/x/time v0.12.0 h1:ScB/8o8olJvc+CQPWrK3fPZNfh7qgwCrY0zJmoEQLSE=
-golang.org/x/time v0.12.0/go.mod h1:CDIdPxbZBQxdj6cxyCIdrNogrJKMJ7pr37NYpMcMDSg=
-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=
 rsc.io/qr v0.2.0 h1:6vBLea5/NRMVTz8V66gipeLycZMl/+UlFmk8DvqQ6WY=
 rsc.io/qr v0.2.0/go.mod h1:IF+uZjkb9fqyeF/4tlBoynqmQxUoPfWEKh921coOuXs=

schema.sql

@@ -1,42 +0,0 @@
-CREATE TABLE users (
-       id	text primary key,
-       created	integer,
-       user	text not null,
-       password	blob not null,
-       salt	blob not null
-);
-
-CREATE TABLE tokens (
-       id	text primary key,
-       uid	text not null,
-       token	text not null,
-       expires	integer default 0,
-       FOREIGN KEY(uid) REFERENCES user(id)
-);
-
-CREATE TABLE database (
-       id	text primary key,
-       host	text not null,
-       port	integer default 5432,
-       name	text not null,
-       user	text not null,
-       password	text not null
-);
-
-CREATE TABLE registrations (
-       id	text primary key,
-       code	text not null
-);
-
-CREATE TABLE roles (
-       id	text primary key,
-       role	text not null
-);
-
-CREATE TABLE user_roles (
-	id	text primary key,
-	uid	text not null,
-	rid	text not null,
-	FOREIGN KEY(uid) REFERENCES user(id),
-	FOREIGN KEY(rid) REFERENCES roles(id)
-);