bvandeusenandClaude Opus 5.5
2f3fbccab6
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While no accounts exist, the server mints a random setup token at boot and logs it. Registering the first account (which becomes admin) must carry it, so whoever reaches a freshly exposed instance first cannot claim it. The register page asks GET /api/auth/setup-status and shows a "Setup token" field in place of the invite field while setup is pending. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
package auth
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import (
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"crypto/rand"
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"crypto/subtle"
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"encoding/hex"
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)
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// SetupToken guards the first-admin registration. Until the first account
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// exists, register makes whoever calls it the admin, so a fresh instance on a
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// public address belonged to whoever found it first. Now that call also has
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// to carry this token, which is generated at startup and written only to the
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// server log: proof that the caller can read the operator's logs.
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//
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// The token lives in memory. A restart mints a new one and logs it again,
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// which is the behaviour wanted: an old token from a log line someone else
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// saw stops working.
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type SetupToken struct {
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value string
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}
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// NewSetupToken mints a 128-bit token.
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func NewSetupToken() (*SetupToken, error) {
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b := make([]byte, 16)
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if _, err := rand.Read(b); err != nil {
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return nil, err
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}
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return &SetupToken{value: hex.EncodeToString(b)}, nil
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}
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// Value returns the token for logging.
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func (t *SetupToken) Value() string {
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if t == nil {
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return ""
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}
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return t.value
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}
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// Matches reports whether supplied is the token, in constant time. A nil
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// token never matches anything, so a missing token fails closed.
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func (t *SetupToken) Matches(supplied string) bool {
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if t == nil || t.value == "" || supplied == "" {
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return false
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}
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return subtle.ConstantTimeCompare([]byte(t.value), []byte(supplied)) == 1
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}
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