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      1 /*-
      2  * Copyright (c) 2015-2017 Dag-Erling Smrgrav
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. The name of the author may not be used to endorse or promote
     14  *    products derived from this software without specific prior written
     15  *    permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #ifdef HAVE_CONFIG_H
     31 # include "config.h"
     32 #endif
     33 
     34 #include <err.h>
     35 #include <errno.h>
     36 #include <stdint.h>
     37 #include <stdio.h>
     38 #include <stdlib.h>
     39 #include <string.h>
     40 
     41 #include <cryb/test.h>
     42 
     43 #include <security/pam_appl.h>
     44 #include <security/openpam.h>
     45 
     46 #include "openpam_impl.h"
     47 #include "openpam_asprintf.h"
     48 
     49 #include "t_pam_conv.h"
     50 
     51 /*
     52  * Conversation function
     53  *
     54  * The appdata argument points to a struct t_pam_conv_script which
     55  * contains both the expected messages and the desired responses.  If
     56  * script.responses is NULL, t_pam_conv() will return PAM_CONV_ERR.  If an
     57  * error occurs (incorrect number of messages, messages don't match script
     58  * etc.), script.comment will be set to point to a malloc()ed string
     59  * describing the error.  Otherwise, t_pam_conv() will return to its
     60  * caller a malloc()ed copy of script.responses.
     61  */
     62 int
     63 t_pam_conv(int nm, const struct pam_message **msgs,
     64     struct pam_response **respsp, void *ad)
     65 {
     66 	struct t_pam_conv_script *s = ad;
     67 	struct pam_response *resps;
     68 	int i;
     69 
     70 	/* check message count */
     71 	if (nm != s->nmsg) {
     72 		asprintf(&s->comment, "expected %d messages, got %d",
     73 		    s->nmsg, nm);
     74 		return (PAM_CONV_ERR);
     75 	}
     76 	if (nm <= 0 || nm > PAM_MAX_NUM_MSG) {
     77 		/* since the previous test passed, this is intentional! */
     78 		s->comment = NULL;
     79 		return (PAM_CONV_ERR);
     80 	}
     81 
     82 	/* check each message and provide the sed answer */
     83 	if ((resps = calloc(nm, sizeof *resps)) == NULL)
     84 		goto enomem;
     85 	for (i = 0; i < nm; ++i) {
     86 		if (msgs[i]->msg_style != s->msgs[i].msg_style) {
     87 			asprintf(&s->comment,
     88 			    "message %d expected style %d got %d", i,
     89 			    s->msgs[i].msg_style, msgs[i]->msg_style);
     90 			goto fail;
     91 		}
     92 		if (strcmp(msgs[i]->msg, s->msgs[i].msg) != 0) {
     93 			asprintf(&s->comment,
     94 			    "message %d expected \"%s\" got \"%s\"", i,
     95 			    s->msgs[i].msg, msgs[i]->msg);
     96 			goto fail;
     97 		}
     98 		switch (msgs[i]->msg_style) {
     99 		case PAM_PROMPT_ECHO_OFF:
    100 			t_printv("[PAM_PROMPT_ECHO_OFF] %s\n", msgs[i]->msg);
    101 			break;
    102 		case PAM_PROMPT_ECHO_ON:
    103 			t_printv("[PAM_PROMPT_ECHO_ON] %s\n", msgs[i]->msg);
    104 			break;
    105 		case PAM_ERROR_MSG:
    106 			t_printv("[PAM_ERROR_MSG] %s\n", msgs[i]->msg);
    107 			break;
    108 		case PAM_TEXT_INFO:
    109 			t_printv("[PAM_TEXT_INFO] %s\n", msgs[i]->msg);
    110 			break;
    111 		default:
    112 			asprintf(&s->comment, "invalid message style %d",
    113 			    msgs[i]->msg_style);
    114 			goto fail;
    115 		}
    116 		/* copy the response, if there is one */
    117 		if (s->resps[i].resp != NULL &&
    118 		    (resps[i].resp = strdup(s->resps[i].resp)) == NULL)
    119 			goto enomem;
    120 		resps[i].resp_retcode = s->resps[i].resp_retcode;
    121 	}
    122 	s->comment = NULL;
    123 	*respsp = resps;
    124 	return (PAM_SUCCESS);
    125 enomem:
    126 	asprintf(&s->comment, "%s", strerror(ENOMEM));
    127 fail:
    128 	for (i = 0; i < nm; ++i)
    129 		free(resps[i].resp);
    130 	free(resps);
    131 	return (PAM_CONV_ERR);
    132 }
    133