Mercurial > trustbridge
annotate cinst/nssstore_linux.c @ 975:b3695a3399de
(issue86) Install into default directories on Linux
If the mozilla process is now started as root it will
try to write into the default directories for NSS Shared
and mozilla / thunderbird profiles.
Cinst will now start the mozilla process once as root.
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Fri, 29 Aug 2014 12:59:44 +0200 |
parents | dbf5ea18cb20 |
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 { |
648
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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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321
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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]); |
5eb7ee4ee819
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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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diff
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|
200 write_stores_nss (char **to_install, char **to_remove) |
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parents:
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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478
diff
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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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(issue86) Install into default directories on Linux
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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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parents:
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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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parents:
diff
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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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parents:
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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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parents:
diff
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|
231 } |
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|
232 |
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233 return 0; |
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diff
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|
234 } |
648
e41a2537b84d
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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(issue86) Install into default directories on Linux
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|
238 my_uid, getgid(), getenv ("HOME")); |
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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 |