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/*-
* Copyright (c) 2015-2017 Dag-Erling Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <err.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <cryb/test.h>
#include <security/pam_appl.h>
#include <security/openpam.h>
#include "openpam_impl.h"
#include "openpam_asprintf.h"
#include "t_pam_conv.h"
/*
* Conversation function
*
* The appdata argument points to a struct t_pam_conv_script which
* contains both the expected messages and the desired responses. If
* script.responses is NULL, t_pam_conv() will return PAM_CONV_ERR. If an
* error occurs (incorrect number of messages, messages don't match script
* etc.), script.comment will be set to point to a malloc()ed string
* describing the error. Otherwise, t_pam_conv() will return to its
* caller a malloc()ed copy of script.responses.
*/
int
t_pam_conv(int nm, const struct pam_message **msgs,
struct pam_response **respsp, void *ad)
{
struct t_pam_conv_script *s = ad;
struct pam_response *resps;
int i;
/* check message count */
if (nm != s->nmsg) {
asprintf(&s->comment, "expected %d messages, got %d",
s->nmsg, nm);
return (PAM_CONV_ERR);
}
if (nm <= 0 || nm > PAM_MAX_NUM_MSG) {
/* since the previous test passed, this is intentional! */
s->comment = NULL;
return (PAM_CONV_ERR);
}
/* check each message and provide the sed answer */
if ((resps = calloc(nm, sizeof *resps)) == NULL)
goto enomem;
for (i = 0; i < nm; ++i) {
if (msgs[i]->msg_style != s->msgs[i].msg_style) {
asprintf(&s->comment,
"message %d expected style %d got %d", i,
s->msgs[i].msg_style, msgs[i]->msg_style);
goto fail;
}
if (strcmp(msgs[i]->msg, s->msgs[i].msg) != 0) {
asprintf(&s->comment,
"message %d expected \"%s\" got \"%s\"", i,
s->msgs[i].msg, msgs[i]->msg);
goto fail;
}
switch (msgs[i]->msg_style) {
case PAM_PROMPT_ECHO_OFF:
t_printv("[PAM_PROMPT_ECHO_OFF] %s\n", msgs[i]->msg);
break;
case PAM_PROMPT_ECHO_ON:
t_printv("[PAM_PROMPT_ECHO_ON] %s\n", msgs[i]->msg);
break;
case PAM_ERROR_MSG:
t_printv("[PAM_ERROR_MSG] %s\n", msgs[i]->msg);
break;
case PAM_TEXT_INFO:
t_printv("[PAM_TEXT_INFO] %s\n", msgs[i]->msg);
break;
default:
asprintf(&s->comment, "invalid message style %d",
msgs[i]->msg_style);
goto fail;
}
/* copy the response, if there is one */
if (s->resps[i].resp != NULL &&
(resps[i].resp = strdup(s->resps[i].resp)) == NULL)
goto enomem;
resps[i].resp_retcode = s->resps[i].resp_retcode;
}
s->comment = NULL;
*respsp = resps;
return (PAM_SUCCESS);
enomem:
asprintf(&s->comment, "%s", strerror(ENOMEM));
fail:
for (i = 0; i < nm; ++i)
free(resps[i].resp);
free(resps);
return (PAM_CONV_ERR);
}
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