pam_smtp is a Linux PAM module which provides a way to authenticate users against an SMTP server.
On success it returns PAM_SUCCESS, otherwise it returns PAM_AUTH_ERR, PAM_SERVICE_ERR, PAM_BUF_ERR or PAM_PERM_DENIED.
No credentials are awarded by this module.
The source program is a single C++17(and newer) file.
Requires: pam-devel, libcurl-devel
$ g++ pam_smtp.cpp -o pam_smtp.so -shared -lpam -lcurl -fPICpam_smtp.so <server[:port]> [starttls|tls] [@domain_name]
If @domain_name is not omitted, username against the SMTP will be PAM_USER@domain_name.
Example:
auth required pam_smtp.so smtp-mail.outlook.com:587 starttls @live.cn
pam_smtp is licensed under the GPLv3 license.