[Bug 4003] Login authentication via PAM

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4003

--- Comment #2 from Denys Vlasenko <vda.linux at googlemail.com> ---
Added to login.c

+# if 0
+/* This supposedly can be used to avoid double password prompt,
+ * if used instead of standard misc_conv():
+ *
+ * "When we want to authenticate first with local method and then with tacacs
for example,
+ *  the password is asked for local method and if not good is asked a second
time for tacacs.
+ *  So if we want to authenticate a user with tacacs, and the user exists
localy, the password is
+ *  asked two times before authentication is accepted."
+ *
+ * However, code looks shaky. For example, why misc_conv() return value is
ignored?
+ * Are msg[i] and resp[i] indexes handled correctly?
+ */
+static char *passwd = NULL;
+static int my_conv(int num_msg, const struct pam_message **msg,
+               struct pam_response **resp, void *data)
+{
+       int i;
+       for (i = 0; i < num_msg; i++) {
+               switch (msg[i]->msg_style) {
+               case PAM_PROMPT_ECHO_OFF:
+                       if (passwd == NULL) {
+                               misc_conv(num_msg, msg, resp, data);
+                               passwd = xstrdup(resp[i]->resp);
+                               return PAM_SUCCESS;
+                       }
+
+                       resp[0] = xzalloc(sizeof(struct pam_response));
+                       resp[0]->resp = passwd;
+                       passwd = NULL;
+                       resp[0]->resp_retcode = PAM_SUCCESS;
+                       resp[1] = NULL;
+                       return PAM_SUCCESS;
+
+               default:
+                       break;
+               }
+       }
+
+       return PAM_SUCCESS;
+}
+# endif

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