Mercurial > trustbridge
annotate cinst/nssstore_linux.c @ 655:1bb40cbb1e39 trustbridge-refactor
Merged into default
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Wed, 25 Jun 2014 15:21:18 +0200 |
parents | 214bf504c54f |
children | e41a2537b84d |
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 |
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24 #include "nssstore.h" |
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25 #include "logging.h" |
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26 #include "strhelp.h" |
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27 |
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28 #define NSS_PROCESS_NAME "mozilla" |
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29 |
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30 /**@brief get the current path of the executable |
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31 * |
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32 * Looks up the current executables directory. The caller |
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33 * has to free the return value. |
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34 * |
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35 * The returned value includes the last / |
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36 * |
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37 * @returns the absolute directory of the currently executed executable or NULL |
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38 */ |
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39 char * |
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40 get_exe_dir() |
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41 { |
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42 char *retval = NULL, |
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43 *p = NULL, |
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44 buf[PATH_MAX]; |
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45 ssize_t ret; |
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46 size_t path_len = 0; |
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47 |
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48 ret = readlink ("/proc/self/exe", buf, PATH_MAX); |
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49 if (ret <= 0) |
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50 { |
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51 ERRORPRINTF ("readlink failed\n"); |
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52 return NULL; |
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53 } |
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54 |
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55 buf[ret] = '\0'; |
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56 |
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57 /* cut off the filename */ |
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58 p = strrchr (buf, '/'); |
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59 if (p == NULL) |
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60 { |
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61 ERRORPRINTF ("No filename found.\n"); |
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62 return NULL; |
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63 } |
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64 *(p + 1) = '\0'; |
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65 |
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66 path_len = strlen (buf); |
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67 retval = xmalloc (path_len + 1); |
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68 strncpy (retval, buf, path_len); |
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69 retval[path_len] = '\0'; |
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70 |
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71 return retval; |
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72 } |
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73 |
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74 /**@brief Start the process to install / remove |
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75 * |
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76 * This forks the process and executes the NSS installation |
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77 * process. It also writes the Instructions to that process. |
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78 * |
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79 * @param [in] to_install strv of DER encoded certificates to be added. |
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80 * @param [in] to_remove strv of DER encoded certificates to be remvoed. |
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81 * @param [in] uid_t uid of the user to install certificates for. |
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82 * @param [in] gid_t the gid of the user to install certificates for. |
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83 * @param [in] homedir the homedir of the user. |
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84 * |
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85 * @returns childs pid on success. -1 on failure |
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86 */ |
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87 static int |
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88 start_procces_for_user (char **to_install, char **to_remove, |
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89 uid_t uid, gid_t gid, char *homedir) |
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90 { |
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91 int pipe_fd[2]; |
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92 pid_t pid = 0; |
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93 char *argv[2] = {NULL, NULL}, |
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94 *envp[2] = {NULL, NULL}, |
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95 *inst_dir = NULL; |
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96 size_t homedir_len = 0, |
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97 exe_path_len = 0; |
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98 int ret = -1, |
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99 i = 0; |
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100 FILE *stream = NULL; |
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101 bool success = false; |
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102 |
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103 if (homedir == NULL) |
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104 { |
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105 ERRORPRINTF ("Invalid call to start_process_for_user\n"); |
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106 return -1; |
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107 } |
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108 |
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109 homedir_len = strlen (homedir); |
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110 |
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111 /* Allocate space for HOME=homedir\0 */ |
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112 envp[0] = xmalloc (homedir_len + 6); |
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113 envp[1] = NULL; |
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114 |
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115 ret = snprintf (envp[0], homedir_len + 6, "HOME=%s", homedir); |
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116 |
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117 if (ret < 0 || (size_t) ret != homedir_len + 5) |
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118 { |
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119 ERRORPRINTF ("Error setting home env variable.\n"); |
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120 xfree (envp[0]); |
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121 return -1; |
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122 } |
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123 |
383
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124 /* Set up the file name of the installer process */ |
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125 inst_dir = get_exe_dir(); |
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126 if (inst_dir == NULL) |
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127 { |
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128 ERRORPRINTF ("Failed to find installation directory.\n"); |
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129 xfree (envp[0]); |
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130 return -1; |
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131 } |
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132 |
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133 exe_path_len = strlen(inst_dir) + strlen(NSS_PROCESS_NAME); |
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134 argv[0] = xmalloc (exe_path_len + 1); |
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135 |
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136 ret = snprintf(argv[0], exe_path_len + 1, "%s%s", inst_dir, NSS_PROCESS_NAME); |
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137 if (ret < 0 || (size_t) ret != exe_path_len) |
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138 { |
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139 ERRORPRINTF ("Error setting executable variable.\n"); |
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140 xfree (argv[0]); |
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141 return -1; |
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142 } |
302
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143 |
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144 if (pipe (pipe_fd)) |
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145 { |
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146 ERRORPRINTF ("Failed to create pipe.\n"); |
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147 return -1; |
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148 } |
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149 |
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150 pid = fork(); |
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151 |
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152 if (pid == (pid_t) -1) |
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153 { |
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154 ERRORPRINTF ("Failed to fork child.\n"); |
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155 return -1; |
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156 } |
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157 |
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158 if (pid == (pid_t) 0) |
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159 { |
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160 /* Drop privileges */ |
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161 if (setuid (uid) || setgid (gid)) |
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162 { |
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163 exit(-1); |
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164 } |
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165 |
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166 close (pipe_fd[1]); |
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167 dup2 (pipe_fd[0], 0); |
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168 close (pipe_fd[0]); |
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169 /* TODO find path based on current executable */ |
383
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170 execve (argv[0], argv, envp); |
302
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171 exit (127); |
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172 } |
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173 |
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174 close (pipe_fd[0]); |
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175 stream = fdopen(pipe_fd[1], "w"); |
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176 if (stream == NULL) |
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177 { |
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178 ERRORPRINTF ("Failed to open pipe for writing\n"); |
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179 goto done; |
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180 } |
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181 |
384
638db75f0fdf
Ignore sigpipe if the child closed the channel or there is an error
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383
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182 /* The NSS installer may exit on error before we are done |
638db75f0fdf
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383
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183 * telling it what to do. We want to handle that rather |
638db75f0fdf
Ignore sigpipe if the child closed the channel or there is an error
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383
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184 * then die unexpectedly. */ |
638db75f0fdf
Ignore sigpipe if the child closed the channel or there is an error
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383
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185 signal(SIGPIPE, SIG_IGN); |
638db75f0fdf
Ignore sigpipe if the child closed the channel or there is an error
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383
diff
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|
186 |
302
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|
187 /* Send the instructions */ |
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188 for (i = 0; to_install && to_install[i]; i++) |
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189 { |
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190 if (fprintf (stream, "I:%s\n", to_install[i]) <= 3) |
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|
191 { |
478
214bf504c54f
Handle broken pipe as it is expected behavior
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diff
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|
192 int err = errno; |
214bf504c54f
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193 ERRORPRINTF ("Write failed: %s \n", strerror(err)); |
214bf504c54f
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194 if (err == 32) |
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476
diff
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|
195 { |
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diff
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|
196 /* Broken pipe is expected if there are no NSS stores |
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|
197 to be found the process just exits. That's ok */ |
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diff
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198 success = true; |
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|
199 } |
302
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200 goto done; |
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diff
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|
201 } |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
202 } |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
203 |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
204 for (i = 0; to_remove && to_remove[i]; i++) |
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parents:
diff
changeset
|
205 { |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
206 if (fprintf (stream, "R:%s\n", to_remove[i]) <= 3) |
fac7e1b0e558
Add nss store calling function and use it in cinst
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parents:
diff
changeset
|
207 { |
478
214bf504c54f
Handle broken pipe as it is expected behavior
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diff
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|
208 int err = errno; |
214bf504c54f
Handle broken pipe as it is expected behavior
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476
diff
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|
209 ERRORPRINTF ("Write failed: %s \n", strerror(err)); |
214bf504c54f
Handle broken pipe as it is expected behavior
Andre Heinecke <aheinecke@intevation.de>
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476
diff
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|
210 if (err == 32) |
214bf504c54f
Handle broken pipe as it is expected behavior
Andre Heinecke <aheinecke@intevation.de>
parents:
476
diff
changeset
|
211 { |
214bf504c54f
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parents:
476
diff
changeset
|
212 /* Broken pipe is expected if there are no NSS stores |
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476
diff
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|
213 to be found the process just exits. That's ok */ |
214bf504c54f
Handle broken pipe as it is expected behavior
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parents:
476
diff
changeset
|
214 success = true; |
214bf504c54f
Handle broken pipe as it is expected behavior
Andre Heinecke <aheinecke@intevation.de>
parents:
476
diff
changeset
|
215 } |
302
fac7e1b0e558
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parents:
diff
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|
216 goto done; |
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parents:
diff
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|
217 } |
fac7e1b0e558
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
218 } |
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parents:
diff
changeset
|
219 |
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diff
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|
220 success = true; |
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parents:
diff
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|
221 |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
222 done: |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
223 if (stream) { |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
224 fclose (stream); |
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parents:
diff
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|
225 } |
383
5eb7ee4ee819
Look up executable name based on /proc/self/exe
Andre Heinecke <andre.heinecke@intevation.de>
parents:
321
diff
changeset
|
226 xfree (argv[0]); |
302
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
227 xfree (envp[0]); |
383
5eb7ee4ee819
Look up executable name based on /proc/self/exe
Andre Heinecke <andre.heinecke@intevation.de>
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321
diff
changeset
|
228 close (pipe_fd[0]); |
5eb7ee4ee819
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parents:
321
diff
changeset
|
229 close (pipe_fd[1]); |
302
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Andre Heinecke <andre.heinecke@intevation.de>
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diff
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|
230 |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
231 if (success) |
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parents:
diff
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|
232 { |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
233 return pid; |
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
234 } |
fac7e1b0e558
Add nss store calling function and use it in cinst
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
235 return -1; |
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Add nss store calling function and use it in cinst
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
236 } |
fac7e1b0e558
Add nss store calling function and use it in cinst
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
237 |
fac7e1b0e558
Add nss store calling function and use it in cinst
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
238 int |
fac7e1b0e558
Add nss store calling function and use it in cinst
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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239 write_stores_nss (char **to_install, char **to_remove) |
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240 { |
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241 uid_t my_uid = getuid(); |
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242 |
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243 if (my_uid != 0) |
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244 { |
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245 /* Running as a user */ |
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246 char *homedir = getenv ("HOME"); |
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247 pid_t childprocess = -1; /* Only one child for single user installation */ |
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248 int status = -1; |
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249 if (!homedir) |
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250 { |
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251 ERRORPRINTF ("Failed to find home directory\n"); |
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252 } |
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253 |
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254 childprocess = start_procces_for_user (to_install, to_remove, |
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255 my_uid, getgid(), homedir); |
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256 |
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257 if (childprocess == -1) |
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258 { |
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259 ERRORPRINTF ("Failed to start childprocess!\n"); |
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260 return -1; |
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261 } |
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262 |
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263 childprocess = waitpid (childprocess, &status, 0); |
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264 if (childprocess == -1 || !WIFEXITED(status)) |
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265 { |
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266 ERRORPRINTF ("Waitpid failed.\n"); |
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267 return -1; |
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268 } |
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269 |
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270 return 0; |
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271 } |
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272 printf ("Installation as root is not yet implemented\n"); |
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273 /* TODO root parse /etc/passwd for users with a home directory */ |
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274 return 0; |
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275 } |
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276 #endif |