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login: add commented-out PAM double password avoidance from BZ 4003

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-01-03 22:43:40 +01:00
parent 76915bf738
commit bae8f98633
1 changed files with 43 additions and 0 deletions
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43
loginutils/login.c
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@ -78,6 +78,49 @@
* Apparently they like to confuse people. */
# include <security/pam_appl.h>
# include <security/pam_misc.h>
# 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
static const struct pam_conv conv = {
misc_conv,
NULL