Mercurial > trustbridge
annotate cinst/nssstore_linux.c @ 1047:f148149c9b09
Added tag 0.9.1 for changeset e10bc7372545
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Thu, 04 Sep 2014 16:15:11 +0200 |
parents | b3695a3399de |
children | 78798d3af8f0 |
rev | line source |
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404 | 1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik |
2 * Software engineering by Intevation GmbH | |
3 * | |
4 * This file is Free Software under the GNU GPL (v>=2) | |
5 * and comes with ABSOLUTELY NO WARRANTY! | |
6 * See LICENSE.txt for details. | |
7 */ | |
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8 #ifndef WIN32 |
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9 |
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10 /* @file |
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11 @brief Linux implementation of nssstore process control. |
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12 */ |
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13 |
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14 #include <stdbool.h> |
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15 #include <stdio.h> |
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16 #include <unistd.h> |
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17 #include <sys/types.h> |
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18 #include <sys/wait.h> |
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19 #include <string.h> |
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20 #include <stdlib.h> |
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21 #include <limits.h> |
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22 #include <errno.h> |
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23 #include <pwd.h> |
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24 |
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25 #include "nssstore.h" |
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26 #include "logging.h" |
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27 #include "strhelp.h" |
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28 #include "util.h" |
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29 |
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30 #define NSS_PROCESS_NAME "mozilla" |
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31 |
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32 |
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33 /**@brief Start the process to install / remove |
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34 * |
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35 * This forks the process and executes the NSS installation |
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36 * process. It also writes the Instructions to that process. |
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37 * |
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38 * @param [in] to_install strv of DER encoded certificates to be added. |
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39 * @param [in] to_remove strv of DER encoded certificates to be remvoed. |
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40 * @param [in] uid_t uid of the user to install certificates for. |
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41 * @param [in] gid_t the gid of the user to install certificates for. |
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42 * @param [in] homedir the homedir of the user. |
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43 * |
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44 * @returns childs pid on success. -1 on failure |
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45 */ |
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46 static int |
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47 start_procces_for_user (char **to_install, char **to_remove, |
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48 uid_t uid, gid_t gid, char *homedir) |
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49 { |
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50 int pipe_fd[2]; |
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51 pid_t pid = 0; |
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52 char *argv[2] = {NULL, NULL}, |
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53 *envp[2] = {NULL, NULL}, |
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54 *inst_dir = NULL; |
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55 size_t homedir_len = 0, |
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56 exe_path_len = 0; |
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57 int ret = -1, |
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58 i = 0; |
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59 FILE *stream = NULL; |
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60 bool success = false; |
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61 |
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62 if (homedir == NULL) |
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63 { |
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64 ERRORPRINTF ("Invalid call to start_process_for_user\n"); |
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65 return -1; |
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66 } |
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67 |
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68 homedir_len = strlen (homedir); |
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69 |
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70 /* Allocate space for HOME=homedir\0 */ |
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71 envp[0] = xmalloc (homedir_len + 6); |
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72 envp[1] = NULL; |
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73 |
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74 ret = snprintf (envp[0], homedir_len + 6, "HOME=%s", homedir); |
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75 |
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76 if (ret < 0 || (size_t) ret != homedir_len + 5) |
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77 { |
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78 ERRORPRINTF ("Error setting home env variable.\n"); |
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79 xfree (envp[0]); |
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80 return -1; |
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81 } |
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82 |
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83 /* Set up the file name of the installer process */ |
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84 inst_dir = get_install_dir(); |
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85 if (inst_dir == NULL) |
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86 { |
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87 ERRORPRINTF ("Failed to find installation directory.\n"); |
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88 xfree (envp[0]); |
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89 return -1; |
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90 } |
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91 |
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92 exe_path_len = strlen(inst_dir) + strlen(NSS_PROCESS_NAME); |
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93 argv[0] = xmalloc (exe_path_len + 1); |
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94 |
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95 ret = snprintf(argv[0], exe_path_len + 1, "%s%s", inst_dir, NSS_PROCESS_NAME); |
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96 xfree (inst_dir); |
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97 if (ret < 0 || (size_t) ret != exe_path_len) |
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98 { |
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99 ERRORPRINTF ("Error setting executable variable.\n"); |
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100 xfree (argv[0]); |
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101 return -1; |
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102 } |
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103 |
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104 if (pipe (pipe_fd)) |
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105 { |
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106 ERRORPRINTF ("Failed to create pipe.\n"); |
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107 return -1; |
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108 } |
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109 |
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110 pid = fork(); |
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111 |
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112 if (pid == (pid_t) -1) |
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113 { |
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114 ERRORPRINTF ("Failed to fork child.\n"); |
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115 return -1; |
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116 } |
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117 |
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118 if (pid == (pid_t) 0) |
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119 { |
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120 /* Drop privileges */ |
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121 if (setgid (gid) || setuid (uid)) |
302
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122 { |
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123 syslog_error_printf("Failed to drop privileges: %s", strerror(errno)); |
302
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124 exit(-1); |
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125 } |
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126 |
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127 close (pipe_fd[1]); |
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128 dup2 (pipe_fd[0], 0); |
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129 close (pipe_fd[0]); |
383
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130 execve (argv[0], argv, envp); |
302
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131 exit (127); |
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132 } |
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133 |
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134 close (pipe_fd[0]); |
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135 stream = fdopen(pipe_fd[1], "w"); |
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136 if (stream == NULL) |
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137 { |
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138 ERRORPRINTF ("Failed to open pipe for writing\n"); |
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139 goto done; |
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140 } |
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141 |
384
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142 /* The NSS installer may exit on error before we are done |
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143 * telling it what to do. We want to handle that rather |
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144 * then die unexpectedly. */ |
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145 signal(SIGPIPE, SIG_IGN); |
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146 |
302
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147 /* Send the instructions */ |
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148 for (i = 0; to_install && to_install[i]; i++) |
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149 { |
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150 if (fprintf (stream, "I:%s\n", to_install[i]) <= 3) |
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151 { |
478
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152 int err = errno; |
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153 ERRORPRINTF ("Write failed: %s \n", strerror(err)); |
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154 if (err == 32) |
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155 { |
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156 /* Broken pipe is expected if there are no NSS stores |
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157 to be found the process just exits. That's ok */ |
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158 success = true; |
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159 } |
302
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160 goto done; |
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161 } |
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162 } |
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163 |
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164 for (i = 0; to_remove && to_remove[i]; i++) |
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165 { |
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166 if (fprintf (stream, "R:%s\n", to_remove[i]) <= 3) |
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167 { |
478
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168 int err = errno; |
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169 ERRORPRINTF ("Write failed: %s \n", strerror(err)); |
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170 if (err == 32) |
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171 { |
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172 /* Broken pipe is expected if there are no NSS stores |
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173 to be found the process just exits. That's ok */ |
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174 success = true; |
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|
175 } |
302
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176 goto done; |
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177 } |
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178 } |
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179 |
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180 success = true; |
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181 |
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182 done: |
905
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183 if (stream) |
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184 { |
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185 fclose (stream); |
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|
186 } |
383
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187 xfree (argv[0]); |
302
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188 xfree (envp[0]); |
383
5eb7ee4ee819
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189 close (pipe_fd[0]); |
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|
190 close (pipe_fd[1]); |
302
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|
191 |
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|
192 if (success) |
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193 { |
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194 return pid; |
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|
195 } |
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196 return -1; |
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197 } |
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198 |
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|
199 int |
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|
200 write_stores_nss (char **to_install, char **to_remove) |
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diff
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|
201 { |
648
e41a2537b84d
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478
diff
changeset
|
202 struct passwd *usr_it = NULL; |
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|
203 uid_t my_uid = geteuid(); |
975
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(issue86) Install into default directories on Linux
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|
204 pid_t childprocess = -1; |
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205 int status = -1; |
302
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206 |
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|
207 if (my_uid != 0) |
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|
208 { |
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|
209 /* Running as a user */ |
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210 char *homedir = getenv ("HOME"); |
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|
211 if (!homedir) |
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|
212 { |
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|
213 ERRORPRINTF ("Failed to find home directory\n"); |
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|
214 } |
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|
215 |
975
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|
216 /* Only one child for single user installation */ |
302
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217 childprocess = start_procces_for_user (to_install, to_remove, |
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|
218 my_uid, getgid(), homedir); |
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219 |
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220 if (childprocess == -1) |
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|
221 { |
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|
222 ERRORPRINTF ("Failed to start childprocess!\n"); |
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223 return -1; |
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|
224 } |
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225 |
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226 childprocess = waitpid (childprocess, &status, 0); |
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227 if (childprocess == -1 || !WIFEXITED(status)) |
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|
228 { |
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|
229 ERRORPRINTF ("Waitpid failed.\n"); |
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230 return -1; |
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|
231 } |
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232 |
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233 return 0; |
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|
234 } |
648
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Implement root installation
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|
235 |
975
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236 /* Start once as root to install in the system default directories. */ |
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(issue86) Install into default directories on Linux
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237 childprocess = start_procces_for_user (to_install, to_remove, |
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238 my_uid, getgid(), getenv ("HOME")); |
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(issue86) Install into default directories on Linux
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|
239 if (childprocess == -1) |
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240 { |
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241 ERRORPRINTF ("Failed to start default profile installation!\n"); |
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242 return -1; |
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243 } |
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244 |
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245 /* Wait until the default profile directories are done. */ |
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246 childprocess = waitpid (childprocess, &status, 0); |
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247 if (childprocess == -1 || !WIFEXITED(status)) |
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248 { |
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249 ERRORPRINTF ("Child process did not finish.\n"); |
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250 return -1; |
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251 } |
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252 |
648
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253 setpwent(); |
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254 |
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255 while ((usr_it = getpwent ()) != NULL) |
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256 { |
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257 /* Skip obvious system accounts */ |
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258 if (strcmp(usr_it->pw_shell, "/usr/sbin/nologin") == 0 || |
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259 strcmp(usr_it->pw_shell, "/bin/false") == 0) |
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260 { |
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261 continue; |
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262 } |
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263 /* A check if the home directory starts with /home might be |
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264 appropiate */ |
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265 start_procces_for_user (to_install, |
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266 to_remove, |
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267 usr_it->pw_uid, |
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268 usr_it->pw_gid, |
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269 usr_it->pw_dir); |
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270 |
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271 } |
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272 |
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273 endpwent(); |
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274 |
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275 waitpid (-1, NULL, 0); |
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276 |
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277 DEBUGPRINTF ("NSS installation done\n"); |
302
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278 return 0; |
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279 } |
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280 #endif |