1 /*- 2 * Copyright (c) 2015-2017 Dag-Erling Smørgrav 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