security: fix improper PAM authorization handling (#6819)

Co-authored-by: Joe Chen <jc@unknwon.io>

CHANGELOG.md

@@ -22,6 +22,7 @@ All notable changes to Gogs are documented in this file.
 ### Fixed
 
 - _Security:_ Potential SSRF in repository migration. [#6754](https://github.com/gogs/gogs/issues/6754)
+- _Security:_ Improper PAM authorization handling. [#6810](https://github.com/gogs/gogs/issues/6810)
 - Unable to use LDAP authentication on ARM machines. [#6761](https://github.com/gogs/gogs/issues/6761)
 
 ### Removed

internal/auth/pam/pam.go

@@ -25,6 +25,10 @@ func (c *Config) doAuth(login, password string) error {
 	if err != nil {
 		return err
 	}
-
-	return t.Authenticate(0)
+	
+	err = t.Authenticate(0)
+	if err != nil {
+		return err
+	}
+	return t.AcctMgmt(0)
 }