annotate svr-authpam.c @ 57:3b2a5a1c4347 authpam

svr-authpam code merged and works. needs tidying a log
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 Aug 2004 16:57:37 +0000
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children 3394a7cb30cd
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 /* Validates a user password */
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26
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27 #include "includes.h"
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28 #include "session.h"
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29 #include "buffer.h"
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30 #include "dbutil.h"
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31 #include "auth.h"
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32
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33 #if defined(HAVE_SECURITY_PAM_APPL_H)
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34 #include <security/pam_appl.h>
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35 #elif defined (HAVE_PAM_PAM_APPL_H)
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36 #include <pam/pam_appl.h>
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37 #endif
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38
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39 #ifdef DROPBEAR_PAM_AUTH
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40
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41 struct UserDataS {
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42 char* user;
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43 char* passwd;
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44 };
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45
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46 /* PAM conversation function */
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47 int
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48 pamConvFunc(int num_msg,
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49 const struct pam_message **msg,
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50 struct pam_response **respp,
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51 void *appdata_ptr) {
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52 int rc = PAM_SUCCESS;
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53 struct pam_response* resp = NULL;
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54 struct UserDataS* userDatap = (struct UserDataS*) appdata_ptr;
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55
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56 /* tbd only handles one msg */
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57
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58 switch((*msg)->msg_style) {
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59 case PAM_PROMPT_ECHO_OFF:
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60 dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_PROMPT_ECHO_OFF: (*msg)->msg=\"%s\"", (*msg)->msg);
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61
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62 if (strcmp((*msg)->msg, "Password:") == 0) {
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63 resp = (struct pam_response*) malloc(sizeof(struct pam_response));
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64 resp->resp = (char*) strdup(userDatap->passwd);
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65 /* dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_PROMPT_ECHO_ON: userDatap->passwd=\"%s\"", userDatap->passwd); */
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66 resp->resp_retcode = 0;
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67 (*respp) = resp;
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68 }
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69 else {
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70 dropbear_log(LOG_WARNING, "pamConvFunc(): PAM_PROMPT_ECHO_OFF: unrecognized prompt, (*msg)->msg=\"%s\"", (*msg)->msg);
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71 rc = PAM_CONV_ERR;
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72 }
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73 break;
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74 case PAM_PROMPT_ECHO_ON:
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75 dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_PROMPT_ECHO_ON: (*msg)->msg=\"%s\"", (*msg)->msg);
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76
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77 if ((strcmp((*msg)->msg, "login: " ) == 0) || (strcmp((*msg)->msg, "Please enter username: " ) == 0)) {
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78 resp = (struct pam_response*) malloc(sizeof(struct pam_response));
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79 resp->resp = (char*) strdup(userDatap->user);
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80 dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_PROMPT_ECHO_ON: userDatap->user=\"%s\"", userDatap->user);
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81 resp->resp_retcode = 0;
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82 (*respp) = resp;
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83 }
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84 else {
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85 dropbear_log(LOG_WARNING, "pamConvFunc(): PAM_PROMPT_ECHO_ON: unrecognized prompt, (*msg)->msg=\"%s\"",
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86 (*msg)->msg);
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87 rc = PAM_CONV_ERR;
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88 }
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89 break;
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90 case PAM_ERROR_MSG:
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91 dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_ERROR_MSG: (*msg)->msg=\"%s\"", (*msg)->msg);
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92 /* printf("error msg: '%s'\n", (*msg)->msg); */
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93 rc = PAM_CONV_ERR;
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94 break;
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95 case PAM_TEXT_INFO:
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96 dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_TEXT_INFO: (*msg)->msg=\"%s\"", (*msg)->msg);
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97 /* printf("text info: '%s'\n", (*msg)->msg); */
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98 rc = PAM_CONV_ERR;
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99 break;
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100 case PAM_RADIO_TYPE:
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101 dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_RADIO_TYPE: (*msg)->msg=\"%s\"", (*msg)->msg);
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102 /* printf("radio type: '%s'\n", (*msg)->msg); */
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103 rc = PAM_CONV_ERR;
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104 break;
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105 case PAM_BINARY_PROMPT:
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106 dropbear_log(LOG_DEBUG, "pamConvFunc(): PAM_BINARY_PROMPT: (*msg)->msg=\"%s\"", (*msg)->msg);
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107 /* printf("binary prompt: '%s'\n", (*msg)->msg); */
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108 rc = PAM_CONV_ERR;
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109 break;
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110 default:
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111 dropbear_log(LOG_DEBUG, "pamConvFunc(): Unknown PAM message");
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112 /* printf("unknown message\n"); */
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113 rc = PAM_CONV_ERR;
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114 break;
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115 }
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116
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117 return rc;
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118 }
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119
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120 /* Process a password auth request, sending success or failure messages as
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121 * appropriate */
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122 void svr_auth_pam() {
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diff changeset
123 // PAM stuff
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124 int rc = PAM_SUCCESS;
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diff changeset
125 struct UserDataS userData;
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126 struct pam_conv pamConv = {
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127 pamConvFunc,
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128 &userData /* submitted to pamvConvFunc as appdata_ptr */
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129 };
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130 pam_handle_t* pamHandlep = NULL;
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131 unsigned char * password = NULL;
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132 unsigned int passwordlen;
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133
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diff changeset
134 unsigned char changepw;
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diff changeset
135
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diff changeset
136 /* check if client wants to change password */
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diff changeset
137 changepw = buf_getbyte(ses.payload);
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diff changeset
138 if (changepw) {
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139 /* not implemented by this server */
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diff changeset
140 send_msg_userauth_failure(0, 1);
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diff changeset
141 return;
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142 }
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diff changeset
143
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144 password = buf_getstring(ses.payload, &passwordlen);
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145
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146 /* clear the buffer containing the password */
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147 buf_incrpos(ses.payload, -passwordlen - 4);
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148 m_burn(buf_getptr(ses.payload, passwordlen + 4), passwordlen + 4);
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149
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150 /* used to pass data to the PAM conversation function */
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151 userData.user = ses.authstate.printableuser;
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152 TRACE(("user is %s\n", userData.user));
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153 userData.passwd = password;
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diff changeset
154
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diff changeset
155 /* Init pam */
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156 if ((rc = pam_start("sshd", NULL, &pamConv, &pamHandlep)) != PAM_SUCCESS) {
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diff changeset
157 dropbear_log(LOG_WARNING, "pam_start() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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diff changeset
158 /* fprintf(stderr, "pam_start() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc)); */
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diff changeset
159 goto clean;
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160 }
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diff changeset
161
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162 /*
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163 if ((rc = pam_set_item(pamHandlep, PAM_RHOST, webReqp->ipaddr) != PAM_SUCCESS)) {
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diff changeset
164 dropbear_log(LOG_WARNING, "pam_set_item() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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parents:
diff changeset
165 return;
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diff changeset
166 }
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diff changeset
167 */
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diff changeset
168
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parents:
diff changeset
169 /* just to set it to something */
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diff changeset
170 if ((rc = pam_set_item(pamHandlep, PAM_TTY, "ssh") != PAM_SUCCESS)) {
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parents:
diff changeset
171 dropbear_log(LOG_WARNING, "pam_set_item() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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parents:
diff changeset
172 goto clean;
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diff changeset
173 }
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
174
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diff changeset
175 (void) pam_fail_delay(pamHandlep, 0 /* musec_delay */);
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parents:
diff changeset
176
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parents:
diff changeset
177 /* (void) pam_set_item(pamHandlep, PAM_FAIL_DELAY, (void*) pamDelayFunc); */
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diff changeset
178
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diff changeset
179 if ((rc = pam_authenticate(pamHandlep, 0)) != PAM_SUCCESS) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 dropbear_log(LOG_WARNING, "pam_authenticate() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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parents:
diff changeset
181 /* fprintf(stderr, "pam_authenticate() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc)); */
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parents:
diff changeset
182 dropbear_log(LOG_WARNING,
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parents:
diff changeset
183 "bad pam password attempt for '%s'",
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parents:
diff changeset
184 ses.authstate.printableuser);
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parents:
diff changeset
185 send_msg_userauth_failure(0, 1);
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parents:
diff changeset
186 goto clean;
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parents:
diff changeset
187 }
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parents:
diff changeset
188
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parents:
diff changeset
189 if ((rc = pam_acct_mgmt(pamHandlep, 0)) != PAM_SUCCESS) {
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parents:
diff changeset
190 dropbear_log(LOG_WARNING, "pam_acct_mgmt() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc));
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parents:
diff changeset
191 /* fprintf(stderr, "pam_acct_mgmt() failed, rc=%d, %s\n", rc, pam_strerror(pamHandlep, rc)); */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 dropbear_log(LOG_WARNING,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 "bad pam password attempt for '%s'",
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parents:
diff changeset
194 ses.authstate.printableuser);
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parents:
diff changeset
195 send_msg_userauth_failure(0, 1);
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parents:
diff changeset
196 goto clean;
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parents:
diff changeset
197 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 /* successful authentication */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200 dropbear_log(LOG_NOTICE,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 "password auth succeeded for '%s'",
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 ses.authstate.printableuser);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 send_msg_userauth_success();
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204
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parents:
diff changeset
205 clean:
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 if (password != NULL) {
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207 m_burn(password, passwordlen);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 m_free(password);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 if (pamHandlep != NULL) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 (void) pam_end(pamHandlep, 0 /* pam_status */);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 #endif /* DROPBEAR_PAM_AUTH */