1 | /*- |
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2 | * Copyright (c) 2002-2003 Networks Associates Technology, Inc. |
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3 | * Copyright (c) 2004-2011 Dag-Erling Smørgrav |
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4 | * All rights reserved. |
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5 | * |
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6 | * This software was developed for the FreeBSD Project by ThinkSec AS and |
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7 | * Network Associates Laboratories, the Security Research Division of |
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8 | * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 |
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9 | * ("CBOSS"), as part of the DARPA CHATS research program. |
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10 | * |
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11 | * Redistribution and use in source and binary forms, with or without |
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12 | * modification, are permitted provided that the following conditions |
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13 | * are met: |
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14 | * 1. Redistributions of source code must retain the above copyright |
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15 | * notice, this list of conditions and the following disclaimer. |
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16 | * 2. Redistributions in binary form must reproduce the above copyright |
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17 | * notice, this list of conditions and the following disclaimer in the |
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18 | * documentation and/or other materials provided with the distribution. |
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19 | * 3. The name of the author may not be used to endorse or promote |
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20 | * products derived from this software without specific prior written |
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21 | * permission. |
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22 | * |
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23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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33 | * SUCH DAMAGE. |
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34 | * |
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35 | * $Id: pam_get_user.c 670 2013-03-17 19:26:07Z des $ |
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36 | */ |
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37 | |
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38 | #ifdef HAVE_CONFIG_H |
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39 | # include "config.h" |
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40 | #endif |
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41 | |
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42 | #include <sys/param.h> |
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43 | |
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44 | #include <stdlib.h> |
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45 | |
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46 | #include <security/pam_appl.h> |
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47 | #include <security/openpam.h> |
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48 | |
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49 | #include "openpam_impl.h" |
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50 | |
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51 | static const char user_prompt[] = "Login:"; |
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52 | |
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53 | /* |
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54 | * XSSO 4.2.1 |
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55 | * XSSO 6 page 52 |
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56 | * |
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57 | * Retrieve user name |
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58 | */ |
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59 | |
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60 | int |
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61 | pam_get_user(pam_handle_t *pamh, |
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62 | const char **user, |
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63 | const char *prompt) |
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64 | { |
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65 | char prompt_buf[1024]; |
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66 | size_t prompt_size; |
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67 | const void *promptp; |
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68 | char *resp; |
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69 | int r; |
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70 | |
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71 | ENTER(); |
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72 | if (pamh == NULL || user == NULL) |
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73 | RETURNC(PAM_SYSTEM_ERR); |
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74 | r = pam_get_item(pamh, PAM_USER, (const void **)user); |
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75 | if (r == PAM_SUCCESS && *user != NULL) |
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76 | RETURNC(PAM_SUCCESS); |
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77 | /* pam policy overrides the module's choice */ |
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78 | if ((promptp = openpam_get_option(pamh, "user_prompt")) != NULL) |
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79 | prompt = promptp; |
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80 | /* no prompt provided, see if there is one tucked away somewhere */ |
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81 | if (prompt == NULL) |
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82 | if (pam_get_item(pamh, PAM_USER_PROMPT, &promptp) && |
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83 | promptp != NULL) |
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84 | prompt = promptp; |
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85 | /* fall back to hardcoded default */ |
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86 | if (prompt == NULL) |
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87 | prompt = user_prompt; |
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88 | /* expand */ |
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89 | prompt_size = sizeof prompt_buf; |
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90 | r = openpam_subst(pamh, prompt_buf, &prompt_size, prompt); |
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91 | if (r == PAM_SUCCESS && prompt_size <= sizeof prompt_buf) |
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92 | prompt = prompt_buf; |
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93 | r = pam_prompt(pamh, PAM_PROMPT_ECHO_ON, &resp, "%s", prompt); |
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94 | if (r != PAM_SUCCESS) |
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95 | RETURNC(r); |
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96 | r = pam_set_item(pamh, PAM_USER, resp); |
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97 | FREE(resp); |
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98 | if (r != PAM_SUCCESS) |
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99 | RETURNC(r); |
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100 | r = pam_get_item(pamh, PAM_USER, (const void **)user); |
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101 | RETURNC(r); |
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102 | } |
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103 | |
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104 | /* |
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105 | * Error codes: |
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106 | * |
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107 | * =pam_get_item |
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108 | * =pam_prompt |
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109 | * =pam_set_item |
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110 | * !PAM_SYMBOL_ERR |
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111 | */ |
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112 | |
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113 | /** |
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114 | * The =pam_get_user function returns the name of the target user, as |
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115 | * specified to =pam_start. |
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116 | * If no user was specified, nor set using =pam_set_item, =pam_get_user |
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117 | * will prompt for a user name. |
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118 | * Either way, a pointer to the user name is stored in the location |
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119 | * pointed to by the =user argument, and the corresponding PAM item is |
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120 | * updated. |
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121 | * |
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122 | * The =prompt argument specifies a prompt to use if no user name is |
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123 | * cached. |
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124 | * If it is =NULL, the =PAM_USER_PROMPT item will be used. |
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125 | * If that item is also =NULL, a hardcoded default prompt will be used. |
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126 | * Additionally, when =pam_get_user is called from a service module, the |
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127 | * prompt may be affected by module options as described below. |
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128 | * The prompt is then expanded using =openpam_subst before it is passed to |
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129 | * the conversation function. |
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130 | * |
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131 | * MODULE OPTIONS |
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132 | * |
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133 | * When called by a service module, =pam_get_user will recognize the |
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134 | * following module options: |
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135 | * |
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136 | * ;user_prompt: |
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137 | * Prompt to use when asking for the user name. |
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138 | * This option overrides both the =prompt argument and the |
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139 | * =PAM_USER_PROMPT item. |
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140 | * |
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141 | * >pam_conv |
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142 | * >pam_get_item |
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143 | * >pam_get_authtok |
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144 | * >openpam_get_option |
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145 | * >openpam_subst |
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146 | */ |
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