Mercurial > trustbridge
annotate cinst/nssstore_linux.c @ 1273:5e0c338552b4
(issue150) Make -u work as an option
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Mon, 29 Sep 2014 10:19:57 +0200 |
parents | e210ecc32d69 |
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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 "trustbridge-nss-installer" |
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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 uid of the user to install certificates for. |
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41 * @param [in] gid 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[3] = {NULL, 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 if (g_debug) |
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96 { |
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97 argv[1] = "--debug"; |
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98 } |
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99 |
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100 ret = snprintf(argv[0], exe_path_len + 1, "%s%s", inst_dir, NSS_PROCESS_NAME); |
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101 xfree (inst_dir); |
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102 if (ret < 0 || (size_t) ret != exe_path_len) |
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103 { |
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104 ERRORPRINTF ("Error setting executable variable.\n"); |
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105 xfree (argv[0]); |
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106 return -1; |
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107 } |
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108 |
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109 if (pipe (pipe_fd)) |
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110 { |
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111 ERRORPRINTF ("Failed to create pipe.\n"); |
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112 return -1; |
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113 } |
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114 |
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115 pid = fork(); |
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116 |
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117 if (pid == (pid_t) -1) |
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118 { |
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|
119 ERRORPRINTF ("Failed to fork child.\n"); |
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120 return -1; |
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121 } |
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122 |
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123 if (pid == (pid_t) 0) |
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124 { |
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125 /* Drop privileges */ |
648
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126 if (setgid (gid) || setuid (uid)) |
302
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|
127 { |
648
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128 syslog_error_printf("Failed to drop privileges: %s", strerror(errno)); |
302
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129 exit(-1); |
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130 } |
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131 |
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132 close (pipe_fd[1]); |
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133 dup2 (pipe_fd[0], 0); |
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134 close (pipe_fd[0]); |
383
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Look up executable name based on /proc/self/exe
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|
135 execve (argv[0], argv, envp); |
302
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136 exit (127); |
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|
137 } |
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138 |
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139 close (pipe_fd[0]); |
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140 stream = fdopen(pipe_fd[1], "w"); |
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141 if (stream == NULL) |
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142 { |
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143 ERRORPRINTF ("Failed to open pipe for writing\n"); |
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144 goto done; |
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145 } |
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146 |
384
638db75f0fdf
Ignore sigpipe if the child closed the channel or there is an error
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147 /* The NSS installer may exit on error before we are done |
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148 * telling it what to do. We want to handle that rather |
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149 * then die unexpectedly. */ |
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150 signal(SIGPIPE, SIG_IGN); |
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151 |
302
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152 /* Send the instructions */ |
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153 for (i = 0; to_install && to_install[i]; i++) |
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154 { |
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155 if (fprintf (stream, "I:%s\n", to_install[i]) <= 3) |
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156 { |
478
214bf504c54f
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157 int err = errno; |
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158 ERRORPRINTF ("Write failed: %s \n", strerror(err)); |
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159 if (err == 32) |
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|
160 { |
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|
161 /* Broken pipe is expected if there are no NSS stores |
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162 to be found the process just exits. That's ok */ |
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163 success = true; |
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|
164 } |
302
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165 goto done; |
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|
166 } |
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|
167 } |
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168 |
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|
169 for (i = 0; to_remove && to_remove[i]; i++) |
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|
170 { |
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171 if (fprintf (stream, "R:%s\n", to_remove[i]) <= 3) |
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|
172 { |
478
214bf504c54f
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|
173 int err = errno; |
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|
174 ERRORPRINTF ("Write failed: %s \n", strerror(err)); |
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175 if (err == 32) |
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|
176 { |
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|
177 /* Broken pipe is expected if there are no NSS stores |
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|
178 to be found the process just exits. That's ok */ |
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|
179 success = true; |
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|
180 } |
302
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181 goto done; |
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|
182 } |
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diff
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|
183 } |
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184 |
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185 success = true; |
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|
186 |
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diff
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|
187 done: |
905
698b6a9bd75e
Fix coding style for C code
Andre Heinecke <andre.heinecke@intevation.de>
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841
diff
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|
188 if (stream) |
698b6a9bd75e
Fix coding style for C code
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841
diff
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|
189 { |
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Fix coding style for C code
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parents:
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diff
changeset
|
190 fclose (stream); |
698b6a9bd75e
Fix coding style for C code
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parents:
841
diff
changeset
|
191 } |
383
5eb7ee4ee819
Look up executable name based on /proc/self/exe
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parents:
321
diff
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|
192 xfree (argv[0]); |
302
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|
193 xfree (envp[0]); |
383
5eb7ee4ee819
Look up executable name based on /proc/self/exe
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321
diff
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|
194 close (pipe_fd[0]); |
5eb7ee4ee819
Look up executable name based on /proc/self/exe
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parents:
321
diff
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|
195 close (pipe_fd[1]); |
302
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|
196 |
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diff
changeset
|
197 if (success) |
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|
198 { |
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|
199 return pid; |
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|
200 } |
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parents:
diff
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|
201 return -1; |
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parents:
diff
changeset
|
202 } |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
203 |
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parents:
diff
changeset
|
204 int |
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parents:
diff
changeset
|
205 write_stores_nss (char **to_install, char **to_remove) |
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parents:
diff
changeset
|
206 { |
648
e41a2537b84d
Implement root installation
Andre Heinecke <andre.heinecke@intevation.de>
parents:
478
diff
changeset
|
207 struct passwd *usr_it = NULL; |
e41a2537b84d
Implement root installation
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parents:
478
diff
changeset
|
208 uid_t my_uid = geteuid(); |
975
b3695a3399de
(issue86) Install into default directories on Linux
Andre Heinecke <andre.heinecke@intevation.de>
parents:
947
diff
changeset
|
209 pid_t childprocess = -1; |
b3695a3399de
(issue86) Install into default directories on Linux
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parents:
947
diff
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|
210 int status = -1; |
302
fac7e1b0e558
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parents:
diff
changeset
|
211 |
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parents:
diff
changeset
|
212 if (my_uid != 0) |
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parents:
diff
changeset
|
213 { |
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parents:
diff
changeset
|
214 /* Running as a user */ |
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parents:
diff
changeset
|
215 char *homedir = getenv ("HOME"); |
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parents:
diff
changeset
|
216 if (!homedir) |
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parents:
diff
changeset
|
217 { |
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parents:
diff
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|
218 ERRORPRINTF ("Failed to find home directory\n"); |
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parents:
diff
changeset
|
219 } |
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parents:
diff
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|
220 |
975
b3695a3399de
(issue86) Install into default directories on Linux
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parents:
947
diff
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|
221 /* Only one child for single user installation */ |
302
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|
222 childprocess = start_procces_for_user (to_install, to_remove, |
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parents:
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|
223 my_uid, getgid(), homedir); |
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parents:
diff
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|
224 |
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parents:
diff
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|
225 if (childprocess == -1) |
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parents:
diff
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|
226 { |
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parents:
diff
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|
227 ERRORPRINTF ("Failed to start childprocess!\n"); |
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|
228 return -1; |
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|
229 } |
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parents:
diff
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|
230 |
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parents:
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|
231 childprocess = waitpid (childprocess, &status, 0); |
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parents:
diff
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|
232 if (childprocess == -1 || !WIFEXITED(status)) |
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parents:
diff
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|
233 { |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
234 ERRORPRINTF ("Waitpid failed.\n"); |
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parents:
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|
235 return -1; |
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parents:
diff
changeset
|
236 } |
fac7e1b0e558
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
237 |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
238 return 0; |
fac7e1b0e558
Add nss store calling function and use it in cinst
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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239 } |
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240 |
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241 /* Start once as root to install in the system default directories. */ |
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242 childprocess = start_procces_for_user (to_install, to_remove, |
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243 my_uid, getgid(), getenv ("HOME")); |
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244 if (childprocess == -1) |
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245 { |
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246 ERRORPRINTF ("Failed to start default profile installation!\n"); |
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247 return -1; |
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248 } |
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249 |
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250 /* Wait until the default profile directories are done. */ |
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251 childprocess = waitpid (childprocess, &status, 0); |
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252 if (childprocess == -1 || !WIFEXITED(status)) |
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253 { |
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254 ERRORPRINTF ("Child process did not finish.\n"); |
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255 return -1; |
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256 } |
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257 |
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258 setpwent(); |
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259 |
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260 while ((usr_it = getpwent ()) != NULL) |
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261 { |
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262 /* Skip obvious system accounts */ |
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263 if (strcmp(usr_it->pw_shell, "/usr/sbin/nologin") == 0 || |
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264 strcmp(usr_it->pw_shell, "/bin/false") == 0) |
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265 { |
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266 continue; |
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267 } |
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268 /* A check if the home directory starts with /home might be |
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269 appropiate */ |
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270 start_procces_for_user (to_install, |
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271 to_remove, |
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272 usr_it->pw_uid, |
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273 usr_it->pw_gid, |
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274 usr_it->pw_dir); |
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275 |
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276 } |
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277 |
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278 endpwent(); |
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279 |
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280 waitpid (-1, NULL, 0); |
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281 |
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282 DEBUGPRINTF ("NSS installation done\n"); |
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283 return 0; |
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284 } |
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285 #endif |