{"record":{"id":"959a4cdb1d1096f1","repo":"juanfont/headscale","slug":"alias-not-supported-for-ssh-source","errorCode":null,"errorMessage":"alias not supported for SSH source","messagePattern":"alias not supported for SSH source","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"hscontrol/policy/v2/types.go","lineNumber":143,"sourceCode":"\tErrGroupValueNotArray          = errors.New(\"group value must be an array of users\")\n\tErrInvalidHostIP               = errors.New(\"hostname contains invalid IP address\")\n\tErrTagNotDefined               = errors.New(\"tag not found\")\n\tErrAutoApproverNotAlias        = errors.New(\"auto approver is not an alias\")\n\tErrInvalidACLAction            = errors.New(\"invalid ACL action\")\n\tErrInvalidSSHAction            = errors.New(\"invalid SSH action\")\n\tErrInvalidProtocolNumber       = errors.New(\"invalid protocol number\")\n\tErrProtocolLeadingZero         = errors.New(\"leading 0 not permitted in protocol number\")\n\tErrProtocolOutOfRange          = errors.New(\"protocol number out of range (0-255)\")\n\tErrAutogroupNotSupported       = errors.New(\"autogroup not supported in headscale\")\n\tErrAutogroupInternetSrc        = errors.New(\"autogroup:internet can only be used in ACL destinations\")\n\tErrAutogroupSelfSrc            = errors.New(\"\\\"autogroup:self\\\" not valid on the src side of a rule\")\n\tErrAutogroupNotSupportedACLSrc = errors.New(\"autogroup not supported for ACL sources\")\n\tErrAutogroupNotSupportedACLDst = errors.New(\"autogroup not supported for ACL destinations\")\n\tErrAutogroupDangerAllDst       = errors.New(\"cannot use autogroup:danger-all as a dst\")\n\tErrAutogroupNotSupportedSSHSrc = errors.New(\"autogroup not supported for SSH sources\")\n\tErrAutogroupNotSupportedSSHDst = errors.New(\"autogroup not supported for SSH destinations\")\n\tErrHostNotDefined              = errors.New(\"host not defined in policy\")\n\tErrSSHSourceAliasNotSupported  = errors.New(\"alias not supported for SSH source\")\n\tErrSSHDestAliasNotSupported    = errors.New(\"alias not supported for SSH destination\")\n\tErrUnknownField                = errors.New(\"unknown field\")\n\tErrProtocolNoSpecificPorts     = errors.New(\"protocol does not support specific ports\")\n\tErrTestEmptyAssertions         = errors.New(\"test entry must have at least one of \\\"accept\\\" or \\\"deny\\\"\")\n\tErrTestProtocolNotAllowed      = errors.New(\"test protocol must be tcp, udp, sctp, or empty\")\n\tErrTestDestinationMultiPort    = errors.New(\"test destination port must be a single port\")\n\tErrTestDestinationCIDR         = errors.New(\"test destination must be a single host, not a CIDR range\")\n\tErrAutogroupInternetTestDst    = errors.New(\"autogroup:internet not valid as a test destination\")\n\tErrSSHTestEmptySrc             = errors.New(\"SSH tests entry must have a non-empty src\")\n\tErrSSHTestEmptyDst             = errors.New(\"SSH tests entry must have at least one dst\")\n\tErrSSHTestDstUnknownTag        = errors.New(\"SSH tests dst contains unknown tag\")\n\tErrSSHTestDstDisallowedElement = errors.New(\"SSH tests dst contains disallowed element\")\n)\n\ntype resolved struct {\n\tips netipx.IPSet\n}\n","sourceCodeStart":125,"sourceCodeEnd":161,"githubUrl":"https://github.com/juanfont/headscale/blob/565fd254d06c4c7f9a8cad1714a43445c79ba420/hscontrol/policy/v2/types.go#L125-L161","documentation":"Returned by SSHSrcAliases.UnmarshalJSON (hscontrol/policy/v2/types.go:2916) when an element of an SSH rule's src array decodes to an alias type other than *Username, *Group, *Tag, or *AutoGroup. SSH sources describe tailnet identities, so IP/CIDR literals and host aliases are structurally rejected at parse time.","triggerScenarios":"An SSH rule like {\"src\": [\"100.64.0.1\"], ...} or {\"src\": [\"10.0.0.0/8\"], ...} — raw addresses/prefixes decode to IP alias types and fail the switch. The error includes the Go type that was rejected (%T).","commonSituations":"Trying to SSH-allow by IP address (common instinct from sshd AllowUsers/Match Address); pasting an ACL src line that uses hosts or CIDRs into an ssh rule.","solutions":["Express SSH src as a user (\"alice@example.com\"), group (\"group:admin\"), tag, or autogroup:member/tagged","If IP-based restriction is the goal, constrain at the ACL layer instead — SSH rules cannot filter by address","Check for stray quotes/typos that make an entry parse as an unexpected type"],"exampleFix":"// before\n\"ssh\": [{\"action\": \"accept\", \"src\": [\"100.64.0.1\"], \"dst\": [\"tag:server\"], \"users\": [\"root\"]}]\n\n// after\n\"ssh\": [{\"action\": \"accept\", \"src\": [\"group:admin\"], \"dst\": [\"tag:server\"], \"users\": [\"root\"]}]","handlingStrategy":"validation","validationCode":"func validSSHSrc(s string) bool {\n\treturn strings.HasPrefix(s, \"autogroup:\") || strings.HasPrefix(s, \"tag:\") ||\n\t\tstrings.HasPrefix(s, \"group:\") || strings.Contains(s, \"@\")\n}","typeGuard":"func isSSHSourceAliasNotSupported(err error) bool {\n\treturn errors.Is(err, policy.ErrSSHSourceAliasNotSupported)\n}","tryCatchPattern":"if err := json.Unmarshal(b, &p); err != nil {\n\tif errors.Is(err, policy.ErrSSHSourceAliasNotSupported) {\n\t\treturn fmt.Errorf(\"SSH src must be user/group/tag/autogroup (no IPs or hosts): %w\", err)\n\t}\n\treturn err\n}","preventionTips":["SSH src entries are identities only — never IPs, CIDRs, or host aliases","Constrain by IP at the ACL layer, not in ssh rules","Add a lint rule rejecting digits-only or slash-containing strings in ssh src arrays"],"tags":["policy","ssh","validation","json"],"backgroundTag":null,"analyzedSha":"565fd254d06c4c7f9a8cad1714a43445c79ba420","analyzedAt":"2026-08-15T13:12:30.133Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}