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Report permissions denied in internal SSH (#13953)
This PR standardizes reporting of permission denied from the internal ssh. Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: 6543 <6543@obermui.de>
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@ -135,6 +135,7 @@ func sessionHandler(session ssh.Session) {
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func publicKeyHandler(ctx ssh.Context, key ssh.PublicKey) bool {
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if ctx.User() != setting.SSH.BuiltinServerUser {
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log.Warn("Permission Denied: Invalid SSH username %s - must use %s for all git operations via ssh", ctx.User(), setting.SSH.BuiltinServerUser)
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return false
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}
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@ -145,17 +146,18 @@ func publicKeyHandler(ctx ssh.Context, key ssh.PublicKey) bool {
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}
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// look for the exact principal
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principalLoop:
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for _, principal := range cert.ValidPrincipals {
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pkey, err := models.SearchPublicKeyByContentExact(principal)
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if err != nil {
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if models.IsErrKeyNotExist(err) {
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log.Debug("Principal Rejected: Unknown Principal: %s", principal)
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continue principalLoop
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}
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log.Error("SearchPublicKeyByContentExact: %v", err)
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return false
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}
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if models.IsErrKeyNotExist(err) {
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continue
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}
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c := &gossh.CertChecker{
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IsUserAuthority: func(auth gossh.PublicKey) bool {
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for _, k := range setting.SSH.TrustedUserCAKeysParsed {
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@ -170,11 +172,14 @@ func publicKeyHandler(ctx ssh.Context, key ssh.PublicKey) bool {
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// check the CA of the cert
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if !c.IsUserAuthority(cert.SignatureKey) {
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return false
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log.Debug("Principal Rejected: Untrusted Authority Signature Fingerprint %s for Principal: %s", gossh.FingerprintSHA256(cert.SignatureKey), principal)
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continue principalLoop
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}
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// validate the cert for this principal
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if err := c.CheckCert(principal, cert); err != nil {
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// User is presenting an invalid cerficate - STOP any further processing
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log.Error("Permission Denied: Invalid Certificate KeyID %s with Signature Fingerprint %s presented for Principal: %s", cert.KeyId, gossh.FingerprintSHA256(cert.SignatureKey), principal)
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return false
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}
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@ -186,6 +191,10 @@ func publicKeyHandler(ctx ssh.Context, key ssh.PublicKey) bool {
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pkey, err := models.SearchPublicKeyByContent(strings.TrimSpace(string(gossh.MarshalAuthorizedKey(key))))
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if err != nil {
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if models.IsErrKeyNotExist(err) {
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log.Warn("Permission Denied: Unknown public key : %s", gossh.FingerprintSHA256(key))
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return false
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}
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log.Error("SearchPublicKeyByContent: %v Failed authentication attempt from %s", err, ctx.RemoteAddr())
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return false
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}
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