diff options
Diffstat (limited to 'modules/setting/ssh.go')
| -rw-r--r-- | modules/setting/ssh.go | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/modules/setting/ssh.go b/modules/setting/ssh.go new file mode 100644 index 0000000..ea387e5 --- /dev/null +++ b/modules/setting/ssh.go @@ -0,0 +1,197 @@ +// Copyright 2023 The Gitea Authors. All rights reserved. +// SPDX-License-Identifier: MIT + +package setting + +import ( + "os" + "path" + "path/filepath" + "strings" + "text/template" + "time" + + "code.gitea.io/gitea/modules/log" + "code.gitea.io/gitea/modules/util" + + gossh "golang.org/x/crypto/ssh" +) + +var SSH = struct { + Disabled bool `ini:"DISABLE_SSH"` + StartBuiltinServer bool `ini:"START_SSH_SERVER"` + BuiltinServerUser string `ini:"BUILTIN_SSH_SERVER_USER"` + UseProxyProtocol bool `ini:"SSH_SERVER_USE_PROXY_PROTOCOL"` + Domain string `ini:"SSH_DOMAIN"` + Port int `ini:"SSH_PORT"` + User string `ini:"SSH_USER"` + ListenHost string `ini:"SSH_LISTEN_HOST"` + ListenPort int `ini:"SSH_LISTEN_PORT"` + RootPath string `ini:"SSH_ROOT_PATH"` + ServerCiphers []string `ini:"SSH_SERVER_CIPHERS"` + ServerKeyExchanges []string `ini:"SSH_SERVER_KEY_EXCHANGES"` + ServerMACs []string `ini:"SSH_SERVER_MACS"` + ServerHostKeys []string `ini:"SSH_SERVER_HOST_KEYS"` + KeyTestPath string `ini:"SSH_KEY_TEST_PATH"` + KeygenPath string `ini:"SSH_KEYGEN_PATH"` + AuthorizedKeysBackup bool `ini:"SSH_AUTHORIZED_KEYS_BACKUP"` + AuthorizedPrincipalsBackup bool `ini:"SSH_AUTHORIZED_PRINCIPALS_BACKUP"` + AuthorizedKeysCommandTemplate string `ini:"SSH_AUTHORIZED_KEYS_COMMAND_TEMPLATE"` + AuthorizedKeysCommandTemplateTemplate *template.Template `ini:"-"` + MinimumKeySizeCheck bool `ini:"-"` + MinimumKeySizes map[string]int `ini:"-"` + CreateAuthorizedKeysFile bool `ini:"SSH_CREATE_AUTHORIZED_KEYS_FILE"` + CreateAuthorizedPrincipalsFile bool `ini:"SSH_CREATE_AUTHORIZED_PRINCIPALS_FILE"` + ExposeAnonymous bool `ini:"SSH_EXPOSE_ANONYMOUS"` + AuthorizedPrincipalsAllow []string `ini:"SSH_AUTHORIZED_PRINCIPALS_ALLOW"` + AuthorizedPrincipalsEnabled bool `ini:"-"` + TrustedUserCAKeys []string `ini:"SSH_TRUSTED_USER_CA_KEYS"` + TrustedUserCAKeysFile string `ini:"SSH_TRUSTED_USER_CA_KEYS_FILENAME"` + TrustedUserCAKeysParsed []gossh.PublicKey `ini:"-"` + PerWriteTimeout time.Duration `ini:"SSH_PER_WRITE_TIMEOUT"` + PerWritePerKbTimeout time.Duration `ini:"SSH_PER_WRITE_PER_KB_TIMEOUT"` +}{ + Disabled: false, + StartBuiltinServer: false, + Domain: "", + Port: 22, + ServerCiphers: []string{"chacha20-poly1305@openssh.com", "aes128-ctr", "aes192-ctr", "aes256-ctr", "aes128-gcm@openssh.com", "aes256-gcm@openssh.com"}, + ServerKeyExchanges: []string{"curve25519-sha256", "ecdh-sha2-nistp256", "ecdh-sha2-nistp384", "ecdh-sha2-nistp521", "diffie-hellman-group14-sha256", "diffie-hellman-group14-sha1"}, + ServerMACs: []string{"hmac-sha2-256-etm@openssh.com", "hmac-sha2-256", "hmac-sha1"}, + KeygenPath: "", + MinimumKeySizeCheck: true, + MinimumKeySizes: map[string]int{"ed25519": 256, "ed25519-sk": 256, "ecdsa": 256, "ecdsa-sk": 256, "rsa": 3071}, + ServerHostKeys: []string{"ssh/gitea.rsa", "ssh/gogs.rsa"}, + AuthorizedKeysCommandTemplate: "{{.AppPath}} --config={{.CustomConf}} serv key-{{.Key.ID}}", + PerWriteTimeout: PerWriteTimeout, + PerWritePerKbTimeout: PerWritePerKbTimeout, +} + +func parseAuthorizedPrincipalsAllow(values []string) ([]string, bool) { + anything := false + email := false + username := false + for _, value := range values { + v := strings.ToLower(strings.TrimSpace(value)) + switch v { + case "off": + return []string{"off"}, false + case "email": + email = true + case "username": + username = true + case "anything": + anything = true + } + } + if anything { + return []string{"anything"}, true + } + + authorizedPrincipalsAllow := []string{} + if username { + authorizedPrincipalsAllow = append(authorizedPrincipalsAllow, "username") + } + if email { + authorizedPrincipalsAllow = append(authorizedPrincipalsAllow, "email") + } + + return authorizedPrincipalsAllow, true +} + +func loadSSHFrom(rootCfg ConfigProvider) { + sec := rootCfg.Section("server") + if len(SSH.Domain) == 0 { + SSH.Domain = Domain + } + + homeDir, err := util.HomeDir() + if err != nil { + log.Fatal("Failed to get home directory: %v", err) + } + homeDir = strings.ReplaceAll(homeDir, "\\", "/") + + SSH.RootPath = path.Join(homeDir, ".ssh") + serverCiphers := sec.Key("SSH_SERVER_CIPHERS").Strings(",") + if len(serverCiphers) > 0 { + SSH.ServerCiphers = serverCiphers + } + serverKeyExchanges := sec.Key("SSH_SERVER_KEY_EXCHANGES").Strings(",") + if len(serverKeyExchanges) > 0 { + SSH.ServerKeyExchanges = serverKeyExchanges + } + serverMACs := sec.Key("SSH_SERVER_MACS").Strings(",") + if len(serverMACs) > 0 { + SSH.ServerMACs = serverMACs + } + SSH.KeyTestPath = os.TempDir() + if err = sec.MapTo(&SSH); err != nil { + log.Fatal("Failed to map SSH settings: %v", err) + } + for i, key := range SSH.ServerHostKeys { + if !filepath.IsAbs(key) { + SSH.ServerHostKeys[i] = filepath.Join(AppDataPath, key) + } + } + + SSH.KeygenPath = sec.Key("SSH_KEYGEN_PATH").String() + SSH.Port = sec.Key("SSH_PORT").MustInt(22) + SSH.ListenPort = sec.Key("SSH_LISTEN_PORT").MustInt(SSH.Port) + SSH.UseProxyProtocol = sec.Key("SSH_SERVER_USE_PROXY_PROTOCOL").MustBool(false) + + // When disable SSH, start builtin server value is ignored. + if SSH.Disabled { + SSH.StartBuiltinServer = false + } + + SSH.TrustedUserCAKeysFile = sec.Key("SSH_TRUSTED_USER_CA_KEYS_FILENAME").MustString(filepath.Join(SSH.RootPath, "gitea-trusted-user-ca-keys.pem")) + + for _, caKey := range SSH.TrustedUserCAKeys { + pubKey, _, _, _, err := gossh.ParseAuthorizedKey([]byte(caKey)) + if err != nil { + log.Fatal("Failed to parse TrustedUserCaKeys: %s %v", caKey, err) + } + + SSH.TrustedUserCAKeysParsed = append(SSH.TrustedUserCAKeysParsed, pubKey) + } + if len(SSH.TrustedUserCAKeys) > 0 { + // Set the default as email,username otherwise we can leave it empty + sec.Key("SSH_AUTHORIZED_PRINCIPALS_ALLOW").MustString("username,email") + } else { + sec.Key("SSH_AUTHORIZED_PRINCIPALS_ALLOW").MustString("off") + } + + SSH.AuthorizedPrincipalsAllow, SSH.AuthorizedPrincipalsEnabled = parseAuthorizedPrincipalsAllow(sec.Key("SSH_AUTHORIZED_PRINCIPALS_ALLOW").Strings(",")) + + SSH.MinimumKeySizeCheck = sec.Key("MINIMUM_KEY_SIZE_CHECK").MustBool(SSH.MinimumKeySizeCheck) + minimumKeySizes := rootCfg.Section("ssh.minimum_key_sizes").Keys() + for _, key := range minimumKeySizes { + if key.MustInt() != -1 { + SSH.MinimumKeySizes[strings.ToLower(key.Name())] = key.MustInt() + } else { + delete(SSH.MinimumKeySizes, strings.ToLower(key.Name())) + } + } + + SSH.AuthorizedKeysBackup = sec.Key("SSH_AUTHORIZED_KEYS_BACKUP").MustBool(false) + SSH.CreateAuthorizedKeysFile = sec.Key("SSH_CREATE_AUTHORIZED_KEYS_FILE").MustBool(true) + + SSH.AuthorizedPrincipalsBackup = false + SSH.CreateAuthorizedPrincipalsFile = false + if SSH.AuthorizedPrincipalsEnabled { + SSH.AuthorizedPrincipalsBackup = sec.Key("SSH_AUTHORIZED_PRINCIPALS_BACKUP").MustBool(true) + SSH.CreateAuthorizedPrincipalsFile = sec.Key("SSH_CREATE_AUTHORIZED_PRINCIPALS_FILE").MustBool(true) + } + + SSH.ExposeAnonymous = sec.Key("SSH_EXPOSE_ANONYMOUS").MustBool(false) + SSH.AuthorizedKeysCommandTemplate = sec.Key("SSH_AUTHORIZED_KEYS_COMMAND_TEMPLATE").MustString(SSH.AuthorizedKeysCommandTemplate) + + SSH.AuthorizedKeysCommandTemplateTemplate = template.Must(template.New("").Parse(SSH.AuthorizedKeysCommandTemplate)) + + SSH.PerWriteTimeout = sec.Key("SSH_PER_WRITE_TIMEOUT").MustDuration(PerWriteTimeout) + SSH.PerWritePerKbTimeout = sec.Key("SSH_PER_WRITE_PER_KB_TIMEOUT").MustDuration(PerWritePerKbTimeout) + + // ensure parseRunModeSetting has been executed before this + SSH.BuiltinServerUser = rootCfg.Section("server").Key("BUILTIN_SSH_SERVER_USER").MustString(RunUser) + SSH.User = rootCfg.Section("server").Key("SSH_USER").MustString(SSH.BuiltinServerUser) +} |