[ssmtp] Add xoauth2 patch

1 files changed, 43 insertions, 0 deletions

diff --git a/xoauth2.patch b/xoauth2.patch
new file mode 100644
index 000000000000..bfc0782b2fdf
--- /dev/null
+++ b/xoauth2.patch
@@ -0,0 +1,43 @@
+Adds XOAUTH2 functionality for safer authentication.
+Still needs a separate script/service to obtain and refresh OAUTH2
+access token for most mail providers.
+
+Patch by Moriyoshi Koizumi <mozo@mozo.jp>
+Modified by Kangjing Huang <huangkangjing@gmail.com>
+
+
+diff --color -u ssmtp-2.64.orig/ssmtp.c ssmtp-2.64/ssmtp.c
+--- ssmtp-2.64.orig/ssmtp.c	2023-10-21 00:39:18.895976193 -0400
++++ ssmtp-2.64/ssmtp.c	2023-10-21 00:40:59.993918590 -0400
+@@ -1604,6 +1604,7 @@
+ 		}
+ 		else {
+ #endif
++		if(auth_method && strcasecmp(auth_method, "login") == 0) {
+ 		memset(buf, 0, bufsize);
+ 		to64frombits(buf, auth_user, strlen(auth_user));
+ 		if (use_oldauth) {
+@@ -1628,6 +1629,22 @@
+ 		memset(buf, 0, bufsize);
+ 
+ 		to64frombits(buf, auth_pass, strlen(auth_pass));
++		} else if(auth_method && strcasecmp(auth_method, "xoauth2") == 0) {
++			int authbuflen;
++			char *authbuf = malloc(5 + strlen(auth_user) + 1 + 5 + 6 + 1 + strlen(auth_pass) + 2 + 1);
++			if(!authbuf) {
++				die("Out of memory");
++			}
++			outbytes += smtp_write(sock, "AUTH XOAUTH2");
++			alarm((unsigned) MEDWAIT);
++			if(smtp_read(sock, buf) != 3) {
++				die("Server didn't accept AUTH XOAUTH2");
++			}
++			memset(buf, 0, bufsize);
++			authbuflen = sprintf(authbuf, "user=%s\1auth=Bearer %s\1\1", auth_user, auth_pass);
++			to64frombits(buf, (unsigned char*)authbuf, authbuflen);
++			free(authbuf);
++		}
+ #ifdef MD5AUTH
+ 		}
+ #endif
+