forgejo/modules/setting/security.go
KN4CK3R c6c829fe3f
Enhanced auth token / remember me (#27606)
Closes #27455

> The mechanism responsible for long-term authentication (the 'remember
me' cookie) uses a weak construction technique. It will hash the user's
hashed password and the rands value; it will then call the secure cookie
code, which will encrypt the user's name with the computed hash. If one
were able to dump the database, they could extract those two values to
rebuild that cookie and impersonate a user. That vulnerability exists
from the date the dump was obtained until a user changed their password.
> 
> To fix this security issue, the cookie could be created and verified
using a different technique such as the one explained at
https://paragonie.com/blog/2015/04/secure-authentication-php-with-long-term-persistence#secure-remember-me-cookies.

The PR removes the now obsolete setting `COOKIE_USERNAME`.
2023-10-14 00:56:41 +00:00

160 lines
6.1 KiB
Go

// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"net/url"
"os"
"strings"
"code.gitea.io/gitea/modules/auth/password/hash"
"code.gitea.io/gitea/modules/generate"
"code.gitea.io/gitea/modules/log"
)
var (
// Security settings
InstallLock bool
SecretKey string
InternalToken string // internal access token
LogInRememberDays int
CookieRememberName string
ReverseProxyAuthUser string
ReverseProxyAuthEmail string
ReverseProxyAuthFullName string
ReverseProxyLimit int
ReverseProxyTrustedProxies []string
MinPasswordLength int
ImportLocalPaths bool
DisableGitHooks bool
DisableWebhooks bool
OnlyAllowPushIfGiteaEnvironmentSet bool
PasswordComplexity []string
PasswordHashAlgo string
PasswordCheckPwn bool
SuccessfulTokensCacheSize int
CSRFCookieName = "_csrf"
CSRFCookieHTTPOnly = true
)
// loadSecret load the secret from ini by uriKey or verbatimKey, only one of them could be set
// If the secret is loaded from uriKey (file), the file should be non-empty, to guarantee the behavior stable and clear.
func loadSecret(sec ConfigSection, uriKey, verbatimKey string) string {
// don't allow setting both URI and verbatim string
uri := sec.Key(uriKey).String()
verbatim := sec.Key(verbatimKey).String()
if uri != "" && verbatim != "" {
log.Fatal("Cannot specify both %s and %s", uriKey, verbatimKey)
}
// if we have no URI, use verbatim
if uri == "" {
return verbatim
}
tempURI, err := url.Parse(uri)
if err != nil {
log.Fatal("Failed to parse %s (%s): %v", uriKey, uri, err)
}
switch tempURI.Scheme {
case "file":
buf, err := os.ReadFile(tempURI.RequestURI())
if err != nil {
log.Fatal("Failed to read %s (%s): %v", uriKey, tempURI.RequestURI(), err)
}
val := strings.TrimSpace(string(buf))
if val == "" {
// The file shouldn't be empty, otherwise we can not know whether the user has ever set the KEY or KEY_URI
// For example: if INTERNAL_TOKEN_URI=file:///empty-file,
// Then if the token is re-generated during installation and saved to INTERNAL_TOKEN
// Then INTERNAL_TOKEN and INTERNAL_TOKEN_URI both exist, that's a fatal error (they shouldn't)
log.Fatal("Failed to read %s (%s): the file is empty", uriKey, tempURI.RequestURI())
}
return val
// only file URIs are allowed
default:
log.Fatal("Unsupported URI-Scheme %q (%q = %q)", tempURI.Scheme, uriKey, uri)
return ""
}
}
// generateSaveInternalToken generates and saves the internal token to app.ini
func generateSaveInternalToken(rootCfg ConfigProvider) {
token, err := generate.NewInternalToken()
if err != nil {
log.Fatal("Error generate internal token: %v", err)
}
InternalToken = token
saveCfg, err := rootCfg.PrepareSaving()
if err != nil {
log.Fatal("Error saving internal token: %v", err)
}
rootCfg.Section("security").Key("INTERNAL_TOKEN").SetValue(token)
saveCfg.Section("security").Key("INTERNAL_TOKEN").SetValue(token)
if err = saveCfg.Save(); err != nil {
log.Fatal("Error saving internal token: %v", err)
}
}
func loadSecurityFrom(rootCfg ConfigProvider) {
sec := rootCfg.Section("security")
InstallLock = HasInstallLock(rootCfg)
LogInRememberDays = sec.Key("LOGIN_REMEMBER_DAYS").MustInt(7)
SecretKey = loadSecret(sec, "SECRET_KEY_URI", "SECRET_KEY")
if SecretKey == "" {
// FIXME: https://github.com/go-gitea/gitea/issues/16832
// Until it supports rotating an existing secret key, we shouldn't move users off of the widely used default value
SecretKey = "!#@FDEWREWR&*(" //nolint:gosec
}
CookieRememberName = sec.Key("COOKIE_REMEMBER_NAME").MustString("gitea_incredible")
ReverseProxyAuthUser = sec.Key("REVERSE_PROXY_AUTHENTICATION_USER").MustString("X-WEBAUTH-USER")
ReverseProxyAuthEmail = sec.Key("REVERSE_PROXY_AUTHENTICATION_EMAIL").MustString("X-WEBAUTH-EMAIL")
ReverseProxyAuthFullName = sec.Key("REVERSE_PROXY_AUTHENTICATION_FULL_NAME").MustString("X-WEBAUTH-FULLNAME")
ReverseProxyLimit = sec.Key("REVERSE_PROXY_LIMIT").MustInt(1)
ReverseProxyTrustedProxies = sec.Key("REVERSE_PROXY_TRUSTED_PROXIES").Strings(",")
if len(ReverseProxyTrustedProxies) == 0 {
ReverseProxyTrustedProxies = []string{"127.0.0.0/8", "::1/128"}
}
MinPasswordLength = sec.Key("MIN_PASSWORD_LENGTH").MustInt(8)
ImportLocalPaths = sec.Key("IMPORT_LOCAL_PATHS").MustBool(false)
DisableGitHooks = sec.Key("DISABLE_GIT_HOOKS").MustBool(true)
DisableWebhooks = sec.Key("DISABLE_WEBHOOKS").MustBool(false)
OnlyAllowPushIfGiteaEnvironmentSet = sec.Key("ONLY_ALLOW_PUSH_IF_GITEA_ENVIRONMENT_SET").MustBool(true)
// Ensure that the provided default hash algorithm is a valid hash algorithm
var algorithm *hash.PasswordHashAlgorithm
PasswordHashAlgo, algorithm = hash.SetDefaultPasswordHashAlgorithm(sec.Key("PASSWORD_HASH_ALGO").MustString(""))
if algorithm == nil {
log.Fatal("The provided password hash algorithm was invalid: %s", sec.Key("PASSWORD_HASH_ALGO").MustString(""))
}
CSRFCookieHTTPOnly = sec.Key("CSRF_COOKIE_HTTP_ONLY").MustBool(true)
PasswordCheckPwn = sec.Key("PASSWORD_CHECK_PWN").MustBool(false)
SuccessfulTokensCacheSize = sec.Key("SUCCESSFUL_TOKENS_CACHE_SIZE").MustInt(20)
InternalToken = loadSecret(sec, "INTERNAL_TOKEN_URI", "INTERNAL_TOKEN")
if InstallLock && InternalToken == "" {
// if Gitea has been installed but the InternalToken hasn't been generated (upgrade from an old release), we should generate
// some users do cluster deployment, they still depend on this auto-generating behavior.
generateSaveInternalToken(rootCfg)
}
cfgdata := sec.Key("PASSWORD_COMPLEXITY").Strings(",")
if len(cfgdata) == 0 {
cfgdata = []string{"off"}
}
PasswordComplexity = make([]string, 0, len(cfgdata))
for _, name := range cfgdata {
name := strings.ToLower(strings.Trim(name, `"`))
if name != "" {
PasswordComplexity = append(PasswordComplexity, name)
}
}
}