Implement passwd command

README.md

@@ -27,7 +27,7 @@ Parity with existing Python version
   * [x] state files
   * [x] source environment
   * [ ] working directory set
-* [ ] update web UI credentials
+* [x] update web UI credentials
 * [ ] automatic crontab integration
 * [ ] feed supports item TTS
 * [x] data directory from envvars

cmd/passwd.go

@@ -1,21 +1,63 @@
 package cmd
 
 import (
-	"log"
+	"fmt"
+	"os"
 
+	"github.com/Jaculabilis/intake/core"
 	"github.com/spf13/cobra"
+	"golang.org/x/term"
 )
 
 var passwdCmd = &cobra.Command{
 	Use:   "passwd",
 	Short: "Set the password for the web interface",
-	Long: `
+	Long: `Set the password for the web interface.
+
+Access through the command line should be controlled by standard filesystem
+permissions.
 `,
 	Run: func(cmd *cobra.Command, args []string) {
-		log.Fatal("not implemented")
+		passwd(boolArg(cmd, "verify"))
 	},
 }
 
 func init() {
 	rootCmd.AddCommand(passwdCmd)
+
+	passwdCmd.Flags().Bool("verify", false, "Compare the input password instead of setting it.")
+}
+
+func passwd(verify bool) {
+	db := openAndMigrateDb()
+
+	fmt.Print("Enter your password: ")
+	bytes, err := term.ReadPassword(int(os.Stdin.Fd()))
+	if err != nil {
+		fmt.Printf("error: failed to read password: %v\n", err)
+		os.Exit(1)
+	}
+	password := string(bytes)
+	fmt.Println()
+
+	if verify {
+		match, err := core.CheckPassword(db, password)
+		if err != nil {
+			fmt.Printf("error: failed to check password: %v\n", err)
+			os.Exit(1)
+		}
+		if match {
+			fmt.Println("correct!")
+			os.Exit(0)
+		} else {
+			fmt.Println("incorrect")
+			os.Exit(1)
+		}
+	}
+
+	err = core.SetPassword(db, password)
+	if err != nil {
+		fmt.Printf("failed to set password: %v\n", err)
+	}
+	fmt.Println("password set")
 }

core/passwd.go

@@ -0,0 +1,41 @@
+package core
+
+import (
+	"database/sql"
+	"fmt"
+
+	"github.com/alexedwards/argon2id"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+func SetPassword(db DB, password string) error {
+	hash, err := argon2id.CreateHash(password, argon2id.DefaultParams)
+	if err != nil {
+		return fmt.Errorf("failed to hash password: %v", err)
+	}
+
+	_, err = db.Exec("insert into password (id, hash) values (1, ?)", hash)
+	if err != nil {
+		return fmt.Errorf("failed to set password hash: %v", err)
+	}
+
+	return nil
+}
+
+func CheckPassword(db DB, password string) (bool, error) {
+	var hash string
+	err := db.QueryRow("select hash from password limit 1").Scan(&hash)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return true, nil
+		}
+		return false, fmt.Errorf("failed to query password hash from database: %v", err)
+	}
+
+	match, err := argon2id.ComparePasswordAndHash(password, hash)
+	if err != nil {
+		return false, fmt.Errorf("failed to compare password and hash: %v", err)
+	}
+
+	return match, nil
+}

core/sql/0001_initial_schema.sql

@@ -36,4 +36,9 @@ create table channels(
     source text not null,
     unique (name, source) on conflict replace
     foreign key (source) references sources (name) on delete cascade
-)
+) strict;
+create table password(
+    id int not null,
+    hash text,
+    unique (id) on conflict replace
+) strict;

go.mod

@@ -4,9 +4,15 @@ go 1.23.4
 
 require github.com/spf13/cobra v1.8.1
 
-require github.com/mattn/go-sqlite3 v1.14.24
+require (
+	github.com/alexedwards/argon2id v1.0.0
+	github.com/mattn/go-sqlite3 v1.14.24
+	golang.org/x/term v0.28.0
+)
 
 require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/crypto v0.14.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
 )

go.sum

@@ -1,3 +1,5 @@
+github.com/alexedwards/argon2id v1.0.0 h1:wJzDx66hqWX7siL/SRUmgz3F8YMrd/nfX/xHHcQQP0w=
+github.com/alexedwards/argon2id v1.0.0/go.mod h1:tYKkqIjzXvZdzPvADMWOEZ+l6+BD6CtBXMj5fnJppiw=
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
@@ -8,5 +10,48 @@ github.com/spf13/cobra v1.8.1 h1:e5/vxKd/rZsfSJMUX1agtjeTDf+qv1/JdBF8gg5k9ZM=
 github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
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+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
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