419 lines
14 KiB
Go
419 lines
14 KiB
Go
package dataprovider
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import (
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"crypto/sha256"
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"encoding/base64"
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"errors"
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"fmt"
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"net"
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"os"
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"regexp"
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"strings"
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"github.com/alexedwards/argon2id"
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passwordvalidator "github.com/wagslane/go-password-validator"
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"golang.org/x/crypto/bcrypt"
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"github.com/drakkan/sftpgo/v2/kms"
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"github.com/drakkan/sftpgo/v2/mfa"
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"github.com/drakkan/sftpgo/v2/sdk"
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"github.com/drakkan/sftpgo/v2/util"
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)
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// Available permissions for SFTPGo admins
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const (
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PermAdminAny = "*"
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PermAdminAddUsers = "add_users"
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PermAdminChangeUsers = "edit_users"
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PermAdminDeleteUsers = "del_users"
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PermAdminViewUsers = "view_users"
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PermAdminViewConnections = "view_conns"
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PermAdminCloseConnections = "close_conns"
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PermAdminViewServerStatus = "view_status"
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PermAdminManageAdmins = "manage_admins"
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PermAdminManageAPIKeys = "manage_apikeys"
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PermAdminQuotaScans = "quota_scans"
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PermAdminManageSystem = "manage_system"
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PermAdminManageDefender = "manage_defender"
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PermAdminViewDefender = "view_defender"
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PermAdminRetentionChecks = "retention_checks"
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)
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var (
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emailRegex = regexp.MustCompile("^(?:(?:(?:(?:[a-zA-Z]|\\d|[!#\\$%&'\\*\\+\\-\\/=\\?\\^_`{\\|}~]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])+(?:\\.([a-zA-Z]|\\d|[!#\\$%&'\\*\\+\\-\\/=\\?\\^_`{\\|}~]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])+)*)|(?:(?:\\x22)(?:(?:(?:(?:\\x20|\\x09)*(?:\\x0d\\x0a))?(?:\\x20|\\x09)+)?(?:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f]|\\x21|[\\x23-\\x5b]|[\\x5d-\\x7e]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(?:(?:[\\x01-\\x09\\x0b\\x0c\\x0d-\\x7f]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}]))))*(?:(?:(?:\\x20|\\x09)*(?:\\x0d\\x0a))?(\\x20|\\x09)+)?(?:\\x22))))@(?:(?:(?:[a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(?:(?:[a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])(?:[a-zA-Z]|\\d|-|\\.|~|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])*(?:[a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])))\\.)+(?:(?:[a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(?:(?:[a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])(?:[a-zA-Z]|\\d|-|\\.|~|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])*(?:[a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])))\\.?$")
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validAdminPerms = []string{PermAdminAny, PermAdminAddUsers, PermAdminChangeUsers, PermAdminDeleteUsers,
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PermAdminViewUsers, PermAdminViewConnections, PermAdminCloseConnections, PermAdminViewServerStatus,
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PermAdminManageAdmins, PermAdminManageAPIKeys, PermAdminQuotaScans, PermAdminManageSystem,
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PermAdminManageDefender, PermAdminViewDefender, PermAdminRetentionChecks}
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)
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// TOTPConfig defines the time-based one time password configuration
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type TOTPConfig struct {
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Enabled bool `json:"enabled,omitempty"`
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ConfigName string `json:"config_name,omitempty"`
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Secret *kms.Secret `json:"secret,omitempty"`
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}
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func (c *TOTPConfig) validate(username string) error {
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if !c.Enabled {
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c.ConfigName = ""
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c.Secret = kms.NewEmptySecret()
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return nil
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}
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if c.ConfigName == "" {
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return util.NewValidationError("totp: config name is mandatory")
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}
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if !util.IsStringInSlice(c.ConfigName, mfa.GetAvailableTOTPConfigNames()) {
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return util.NewValidationError(fmt.Sprintf("totp: config name %#v not found", c.ConfigName))
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}
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if c.Secret.IsEmpty() {
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return util.NewValidationError("totp: secret is mandatory")
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}
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if c.Secret.IsPlain() {
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c.Secret.SetAdditionalData(username)
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if err := c.Secret.Encrypt(); err != nil {
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return util.NewValidationError(fmt.Sprintf("totp: unable to encrypt secret: %v", err))
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}
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}
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return nil
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}
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// AdminFilters defines additional restrictions for SFTPGo admins
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// TODO: rename to AdminOptions in v3
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type AdminFilters struct {
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// only clients connecting from these IP/Mask are allowed.
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// IP/Mask must be in CIDR notation as defined in RFC 4632 and RFC 4291
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// for example "192.0.2.0/24" or "2001:db8::/32"
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AllowList []string `json:"allow_list,omitempty"`
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// API key auth allows to impersonate this administrator with an API key
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AllowAPIKeyAuth bool `json:"allow_api_key_auth,omitempty"`
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// Time-based one time passwords configuration
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TOTPConfig TOTPConfig `json:"totp_config,omitempty"`
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// Recovery codes to use if the user loses access to their second factor auth device.
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// Each code can only be used once, you should use these codes to login and disable or
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// reset 2FA for your account
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RecoveryCodes []sdk.RecoveryCode `json:"recovery_codes,omitempty"`
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}
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// Admin defines a SFTPGo admin
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type Admin struct {
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// Database unique identifier
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ID int64 `json:"id"`
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// 1 enabled, 0 disabled (login is not allowed)
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Status int `json:"status"`
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// Username
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Username string `json:"username"`
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Password string `json:"password,omitempty"`
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Email string `json:"email,omitempty"`
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Permissions []string `json:"permissions"`
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Filters AdminFilters `json:"filters,omitempty"`
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Description string `json:"description,omitempty"`
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AdditionalInfo string `json:"additional_info,omitempty"`
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// Creation time as unix timestamp in milliseconds. It will be 0 for admins created before v2.2.0
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CreatedAt int64 `json:"created_at"`
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// last update time as unix timestamp in milliseconds
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UpdatedAt int64 `json:"updated_at"`
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// Last login as unix timestamp in milliseconds
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LastLogin int64 `json:"last_login"`
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}
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// CountUnusedRecoveryCodes returns the number of unused recovery codes
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func (a *Admin) CountUnusedRecoveryCodes() int {
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unused := 0
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for _, code := range a.Filters.RecoveryCodes {
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if !code.Used {
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unused++
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}
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}
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return unused
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}
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func (a *Admin) checkPassword() error {
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if a.Password != "" && !util.IsStringPrefixInSlice(a.Password, internalHashPwdPrefixes) {
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if config.PasswordValidation.Admins.MinEntropy > 0 {
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if err := passwordvalidator.Validate(a.Password, config.PasswordValidation.Admins.MinEntropy); err != nil {
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return util.NewValidationError(err.Error())
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}
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}
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if config.PasswordHashing.Algo == HashingAlgoBcrypt {
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pwd, err := bcrypt.GenerateFromPassword([]byte(a.Password), config.PasswordHashing.BcryptOptions.Cost)
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if err != nil {
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return err
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}
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a.Password = string(pwd)
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} else {
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pwd, err := argon2id.CreateHash(a.Password, argon2Params)
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if err != nil {
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return err
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}
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a.Password = pwd
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}
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}
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return nil
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}
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func (a *Admin) hasRedactedSecret() bool {
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return a.Filters.TOTPConfig.Secret.IsRedacted()
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}
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func (a *Admin) validateRecoveryCodes() error {
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for i := 0; i < len(a.Filters.RecoveryCodes); i++ {
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code := &a.Filters.RecoveryCodes[i]
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if code.Secret.IsEmpty() {
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return util.NewValidationError("mfa: recovery code cannot be empty")
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}
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if code.Secret.IsPlain() {
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code.Secret.SetAdditionalData(a.Username)
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if err := code.Secret.Encrypt(); err != nil {
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return util.NewValidationError(fmt.Sprintf("mfa: unable to encrypt recovery code: %v", err))
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}
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}
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}
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return nil
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}
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func (a *Admin) validatePermissions() error {
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a.Permissions = util.RemoveDuplicates(a.Permissions)
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if len(a.Permissions) == 0 {
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return util.NewValidationError("please grant some permissions to this admin")
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}
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if util.IsStringInSlice(PermAdminAny, a.Permissions) {
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a.Permissions = []string{PermAdminAny}
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}
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for _, perm := range a.Permissions {
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if !util.IsStringInSlice(perm, validAdminPerms) {
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return util.NewValidationError(fmt.Sprintf("invalid permission: %#v", perm))
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}
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}
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return nil
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}
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func (a *Admin) validate() error {
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a.SetEmptySecretsIfNil()
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if a.Username == "" {
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return util.NewValidationError("username is mandatory")
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}
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if a.Password == "" {
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return util.NewValidationError("please set a password")
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}
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if a.hasRedactedSecret() {
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return util.NewValidationError("cannot save an admin with a redacted secret")
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}
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if err := a.Filters.TOTPConfig.validate(a.Username); err != nil {
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return err
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}
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if err := a.validateRecoveryCodes(); err != nil {
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return err
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}
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if !config.SkipNaturalKeysValidation && !usernameRegex.MatchString(a.Username) {
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return util.NewValidationError(fmt.Sprintf("username %#v is not valid, the following characters are allowed: a-zA-Z0-9-_.~", a.Username))
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}
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if err := a.checkPassword(); err != nil {
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return err
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}
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if err := a.validatePermissions(); err != nil {
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return err
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}
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if a.Email != "" && !emailRegex.MatchString(a.Email) {
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return util.NewValidationError(fmt.Sprintf("email %#v is not valid", a.Email))
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}
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for _, IPMask := range a.Filters.AllowList {
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_, _, err := net.ParseCIDR(IPMask)
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if err != nil {
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return util.NewValidationError(fmt.Sprintf("could not parse allow list entry %#v : %v", IPMask, err))
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}
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}
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return nil
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}
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// CheckPassword verifies the admin password
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func (a *Admin) CheckPassword(password string) (bool, error) {
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if strings.HasPrefix(a.Password, bcryptPwdPrefix) {
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if err := bcrypt.CompareHashAndPassword([]byte(a.Password), []byte(password)); err != nil {
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return false, ErrInvalidCredentials
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}
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return true, nil
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}
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return argon2id.ComparePasswordAndHash(password, a.Password)
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}
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// CanLoginFromIP returns true if login from the given IP is allowed
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func (a *Admin) CanLoginFromIP(ip string) bool {
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if len(a.Filters.AllowList) == 0 {
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return true
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}
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parsedIP := net.ParseIP(ip)
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if parsedIP == nil {
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return len(a.Filters.AllowList) == 0
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}
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for _, ipMask := range a.Filters.AllowList {
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_, network, err := net.ParseCIDR(ipMask)
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if err != nil {
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continue
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}
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if network.Contains(parsedIP) {
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return true
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}
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}
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return false
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}
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// CanLogin returns an error if the login is not allowed
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func (a *Admin) CanLogin(ip string) error {
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if a.Status != 1 {
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return fmt.Errorf("admin %#v is disabled", a.Username)
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}
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if !a.CanLoginFromIP(ip) {
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return fmt.Errorf("login from IP %v not allowed", ip)
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}
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return nil
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}
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func (a *Admin) checkUserAndPass(password, ip string) error {
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if err := a.CanLogin(ip); err != nil {
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return err
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}
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if a.Password == "" || password == "" {
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return errors.New("credentials cannot be null or empty")
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}
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match, err := a.CheckPassword(password)
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if err != nil {
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return err
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}
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if !match {
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return ErrInvalidCredentials
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}
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return nil
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}
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// HideConfidentialData hides admin confidential data
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func (a *Admin) HideConfidentialData() {
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a.Password = ""
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if a.Filters.TOTPConfig.Secret != nil {
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a.Filters.TOTPConfig.Secret.Hide()
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}
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for _, code := range a.Filters.RecoveryCodes {
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if code.Secret != nil {
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code.Secret.Hide()
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}
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}
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a.SetNilSecretsIfEmpty()
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}
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// SetEmptySecretsIfNil sets the secrets to empty if nil
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func (a *Admin) SetEmptySecretsIfNil() {
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if a.Filters.TOTPConfig.Secret == nil {
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a.Filters.TOTPConfig.Secret = kms.NewEmptySecret()
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}
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}
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// SetNilSecretsIfEmpty set the secrets to nil if empty.
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// This is useful before rendering as JSON so the empty fields
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// will not be serialized.
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func (a *Admin) SetNilSecretsIfEmpty() {
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if a.Filters.TOTPConfig.Secret != nil && a.Filters.TOTPConfig.Secret.IsEmpty() {
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a.Filters.TOTPConfig.Secret = nil
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}
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}
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// HasPermission returns true if the admin has the specified permission
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func (a *Admin) HasPermission(perm string) bool {
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if util.IsStringInSlice(PermAdminAny, a.Permissions) {
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return true
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}
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return util.IsStringInSlice(perm, a.Permissions)
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}
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// GetPermissionsAsString returns permission as string
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func (a *Admin) GetPermissionsAsString() string {
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return strings.Join(a.Permissions, ", ")
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}
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// GetAllowedIPAsString returns the allowed IP as comma separated string
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func (a *Admin) GetAllowedIPAsString() string {
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return strings.Join(a.Filters.AllowList, ",")
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}
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// GetValidPerms returns the allowed admin permissions
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func (a *Admin) GetValidPerms() []string {
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return validAdminPerms
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}
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// GetInfoString returns admin's info as string.
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func (a *Admin) GetInfoString() string {
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var result string
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if a.Email != "" {
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result = fmt.Sprintf("Email: %v. ", a.Email)
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}
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if len(a.Filters.AllowList) > 0 {
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result += fmt.Sprintf("Allowed IP/Mask: %v. ", len(a.Filters.AllowList))
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}
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return result
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}
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// CanManageMFA returns true if the admin can add a multi-factor authentication configuration
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func (a *Admin) CanManageMFA() bool {
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return len(mfa.GetAvailableTOTPConfigs()) > 0
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}
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// GetSignature returns a signature for this admin.
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// It could change after an update
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func (a *Admin) GetSignature() string {
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data := []byte(a.Username)
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data = append(data, []byte(a.Password)...)
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signature := sha256.Sum256(data)
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return base64.StdEncoding.EncodeToString(signature[:])
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}
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func (a *Admin) getACopy() Admin {
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a.SetEmptySecretsIfNil()
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permissions := make([]string, len(a.Permissions))
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copy(permissions, a.Permissions)
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filters := AdminFilters{}
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filters.AllowList = make([]string, len(a.Filters.AllowList))
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filters.AllowAPIKeyAuth = a.Filters.AllowAPIKeyAuth
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filters.TOTPConfig.Enabled = a.Filters.TOTPConfig.Enabled
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filters.TOTPConfig.ConfigName = a.Filters.TOTPConfig.ConfigName
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filters.TOTPConfig.Secret = a.Filters.TOTPConfig.Secret.Clone()
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copy(filters.AllowList, a.Filters.AllowList)
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filters.RecoveryCodes = make([]sdk.RecoveryCode, 0)
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for _, code := range a.Filters.RecoveryCodes {
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if code.Secret == nil {
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code.Secret = kms.NewEmptySecret()
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}
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filters.RecoveryCodes = append(filters.RecoveryCodes, sdk.RecoveryCode{
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Secret: code.Secret.Clone(),
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Used: code.Used,
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})
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}
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return Admin{
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ID: a.ID,
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Status: a.Status,
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Username: a.Username,
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Password: a.Password,
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Email: a.Email,
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Permissions: permissions,
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Filters: filters,
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AdditionalInfo: a.AdditionalInfo,
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Description: a.Description,
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LastLogin: a.LastLogin,
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CreatedAt: a.CreatedAt,
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UpdatedAt: a.UpdatedAt,
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}
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}
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func (a *Admin) setFromEnv() error {
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envUsername := strings.TrimSpace(os.Getenv("SFTPGO_DEFAULT_ADMIN_USERNAME"))
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envPassword := strings.TrimSpace(os.Getenv("SFTPGO_DEFAULT_ADMIN_PASSWORD"))
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if envUsername == "" || envPassword == "" {
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return errors.New(`to create the default admin you need to set the env vars "SFTPGO_DEFAULT_ADMIN_USERNAME" and "SFTPGO_DEFAULT_ADMIN_PASSWORD"`)
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}
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a.Username = envUsername
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a.Password = envPassword
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a.Status = 1
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a.Permissions = []string{PermAdminAny}
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return nil
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}
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