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annotate cinst/nssstore_linux.c @ 345:fe86c45755d8

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Add another hint for nss include lookup. On Ubuntu nspr is installed in it's own subdirectory
author Andre Heinecke <andre.heinecke@intevation.de>
date Thu, 10 Apr 2014 11:11:27 +0200
parents 824ef90a6721
children 5eb7ee4ee819
rev   line source
302
fac7e1b0e558 Add nss store calling function and use it in cinst
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
1 #ifndef WIN32
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2
321
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3 /* @file
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4 @brief Linux implementation of nssstore process control.
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5 */
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6
302
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7 #include <stdbool.h>
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8 #include <stdio.h>
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9 #include <unistd.h>
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10 #include <sys/types.h>
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11 #include <sys/wait.h>
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12 #include <string.h>
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13 #include <stdlib.h>
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14
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15 #include "nssstore.h"
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16 #include "logging.h"
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17 #include "strhelp.h"
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18
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19 /**@brief Start the process to install / remove
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20 *
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21 * This forks the process and executes the NSS installation
fac7e1b0e558 Add nss store calling function and use it in cinst
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22 * process. It also writes the Instructions to that process.
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23 *
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24 * @param [in] to_install strv of DER encoded certificates to be added.
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25 * @param [in] to_remove strv of DER encoded certificates to be remvoed.
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26 * @param [in] uid_t uid of the user to install certificates for.
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27 * @param [in] gid_t the gid of the user to install certificates for.
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28 * @param [in] homedir the homedir of the user.
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29 *
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30 * @returns childs pid on success. -1 on failure
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31 */
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32 static int
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33 start_procces_for_user (char **to_install, char **to_remove,
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34 uid_t uid, gid_t gid, char *homedir)
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35 {
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36 int pipe_fd[2];
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37 pid_t pid = 0;
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38 char *argv[] = {"mozilla", NULL},
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39 *envp[2];
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40 size_t homedir_len = 0;
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41 int ret = -1,
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42 i = 0;
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43 FILE *stream = NULL;
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44 bool success = false;
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45
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46 if (homedir == NULL)
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47 {
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48 ERRORPRINTF ("Invalid call to start_process_for_user\n");
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49 return -1;
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50 }
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51
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52 homedir_len = strlen (homedir);
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53
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54 /* Allocate space for HOME=homedir\0 */
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55 envp[0] = xmalloc (homedir_len + 6);
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56 envp[1] = NULL;
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57
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58 ret = snprintf (envp[0], homedir_len + 6, "HOME=%s", homedir);
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59
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60 if (ret < 0 || (size_t) ret != homedir_len + 5)
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61 {
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62 ERRORPRINTF ("Error setting home env variable.\n");
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63 xfree (envp[0]);
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64 return -1;
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65 }
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66
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67 DEBUGPRINTF ("Home: %s \n", envp[0]);
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68
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69 if (pipe (pipe_fd))
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70 {
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71 ERRORPRINTF ("Failed to create pipe.\n");
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72 return -1;
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73 }
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74
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75 pid = fork();
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76
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77 if (pid == (pid_t) -1)
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78 {
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79 ERRORPRINTF ("Failed to fork child.\n");
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80 return -1;
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81 }
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82
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83 if (pid == (pid_t) 0)
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84 {
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85 /* Drop privileges */
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86 if (setuid (uid) || setgid (gid))
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87 {
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88 exit(-1);
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89 }
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90
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91 close (pipe_fd[1]);
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92 dup2 (pipe_fd[0], 0);
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93 close (pipe_fd[0]);
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94 /* TODO find path based on current executable */
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95 execve ("mozilla", argv, envp);
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96 exit (127);
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97 }
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98
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99 close (pipe_fd[0]);
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100 stream = fdopen(pipe_fd[1], "w");
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101 if (stream == NULL)
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102 {
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103 ERRORPRINTF ("Failed to open pipe for writing\n");
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104 goto done;
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105 }
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106
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107 /* Send the instructions */
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108 for (i = 0; to_install && to_install[i]; i++)
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109 {
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110 if (fprintf (stream, "I:%s\n", to_install[i]) <= 3)
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111 {
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112 ERRORPRINTF ("Write failed \n");
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113 goto done;
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114 }
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115 }
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116
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117 for (i = 0; to_remove && to_remove[i]; i++)
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118 {
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119 if (fprintf (stream, "R:%s\n", to_remove[i]) <= 3)
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120 {
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121 ERRORPRINTF ("Write failed \n");
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122 goto done;
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123 }
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124 }
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125
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126 success = true;
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127
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128 done:
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129 if (stream) {
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130 fclose (stream);
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131 }
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132 xfree (envp[0]);
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133 close(pipe_fd[0]);
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134 close(pipe_fd[1]);
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135
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136 if (success)
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137 {
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138 return pid;
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139 }
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140 return -1;
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141 }
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142
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143 int
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144 write_stores_nss (char **to_install, char **to_remove)
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145 {
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146 uid_t my_uid = getuid();
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147
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148 if (my_uid != 0)
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149 {
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150 /* Running as a user */
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151 char *homedir = getenv ("HOME");
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152 pid_t childprocess = -1; /* Only one child for single user installation */
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153 int status = -1;
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154 if (!homedir)
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155 {
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156 ERRORPRINTF ("Failed to find home directory\n");
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157 }
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158
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159 childprocess = start_procces_for_user (to_install, to_remove,
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160 my_uid, getgid(), homedir);
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161
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162 if (childprocess == -1)
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163 {
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164 ERRORPRINTF ("Failed to start childprocess!\n");
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165 return -1;
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166 }
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167
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168 childprocess = waitpid (childprocess, &status, 0);
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169 if (childprocess == -1 || !WIFEXITED(status))
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170 {
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171 ERRORPRINTF ("Waitpid failed.\n");
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172 return -1;
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173 }
305
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174 DEBUGPRINTF ("Child returned status: %i\n", WEXITSTATUS(status));
302
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175
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176 return 0;
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177 }
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178 printf ("Installation as root is not yet implemented\n");
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179 /* TODO root parse /etc/passwd for users with a home directory */
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180 return 0;
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181 }
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182 #endif
http://wald.intevation.org/projects/trustbridge/