135 lines
4.2 KiB
C
135 lines
4.2 KiB
C
/*-
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* Copyright (c) 2015-2017 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $OpenPAM: t_pam_conv.c 938 2017-04-30 21:34:42Z des $
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <err.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <cryb/test.h>
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#include <security/pam_appl.h>
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#include <security/openpam.h>
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#include "openpam_impl.h"
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#include "openpam_asprintf.h"
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#include "t_pam_conv.h"
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/*
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* Conversation function
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*
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* The appdata argument points to a struct t_pam_conv_script which
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* contains both the expected messages and the desired responses. If
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* script.responses is NULL, t_pam_conv() will return PAM_CONV_ERR. If an
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* error occurs (incorrect number of messages, messages don't match script
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* etc.), script.comment will be set to point to a malloc()ed string
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* describing the error. Otherwise, t_pam_conv() will return to its
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* caller a malloc()ed copy of script.responses.
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*/
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int
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t_pam_conv(int nm, const struct pam_message **msgs,
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struct pam_response **respsp, void *ad)
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{
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struct t_pam_conv_script *s = ad;
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struct pam_response *resps;
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int i;
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/* check message count */
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if (nm != s->nmsg) {
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asprintf(&s->comment, "expected %d messages, got %d",
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s->nmsg, nm);
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return (PAM_CONV_ERR);
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}
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if (nm <= 0 || nm > PAM_MAX_NUM_MSG) {
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/* since the previous test passed, this is intentional! */
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s->comment = NULL;
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return (PAM_CONV_ERR);
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}
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/* check each message and provide the sed answer */
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if ((resps = calloc(nm, sizeof *resps)) == NULL)
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goto enomem;
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for (i = 0; i < nm; ++i) {
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if (msgs[i]->msg_style != s->msgs[i].msg_style) {
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asprintf(&s->comment,
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"message %d expected style %d got %d", i,
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s->msgs[i].msg_style, msgs[i]->msg_style);
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goto fail;
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}
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if (strcmp(msgs[i]->msg, s->msgs[i].msg) != 0) {
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asprintf(&s->comment,
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"message %d expected \"%s\" got \"%s\"", i,
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s->msgs[i].msg, msgs[i]->msg);
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goto fail;
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}
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switch (msgs[i]->msg_style) {
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case PAM_PROMPT_ECHO_OFF:
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t_printv("[PAM_PROMPT_ECHO_OFF] %s\n", msgs[i]->msg);
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break;
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case PAM_PROMPT_ECHO_ON:
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t_printv("[PAM_PROMPT_ECHO_ON] %s\n", msgs[i]->msg);
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break;
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case PAM_ERROR_MSG:
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t_printv("[PAM_ERROR_MSG] %s\n", msgs[i]->msg);
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break;
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case PAM_TEXT_INFO:
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t_printv("[PAM_TEXT_INFO] %s\n", msgs[i]->msg);
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break;
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default:
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asprintf(&s->comment, "invalid message style %d",
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msgs[i]->msg_style);
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goto fail;
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}
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/* copy the response, if there is one */
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if (s->resps[i].resp != NULL &&
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(resps[i].resp = strdup(s->resps[i].resp)) == NULL)
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goto enomem;
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resps[i].resp_retcode = s->resps[i].resp_retcode;
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}
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s->comment = NULL;
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*respsp = resps;
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return (PAM_SUCCESS);
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enomem:
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asprintf(&s->comment, "%s", strerror(ENOMEM));
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fail:
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for (i = 0; i < nm; ++i)
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free(resps[i].resp);
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free(resps);
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return (PAM_CONV_ERR);
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}
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