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annotate cinst/nssstore_linux.c @ 302:fac7e1b0e558

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Add nss store calling function and use it in cinst
author Andre Heinecke <andre.heinecke@intevation.de>
date Thu, 03 Apr 2014 14:28:23 +0200
parents
children 4a3febc6d806
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
fac7e1b0e558 Add nss store calling function and use it in cinst
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3 #include <stdbool.h>
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4 #include <stdio.h>
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5 #include <unistd.h>
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6 #include <sys/types.h>
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7 #include <sys/wait.h>
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8 #include <string.h>
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9 #include <stdlib.h>
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10
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11 #include "nssstore.h"
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12 #include "logging.h"
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13 #include "strhelp.h"
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14
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15 /**@brief Start the process to install / remove
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16 *
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Andre Heinecke <andre.heinecke@intevation.de>
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17 * This forks the process and executes the NSS installation
fac7e1b0e558 Add nss store calling function and use it in cinst
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18 * process. It also writes the Instructions to that process.
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19 *
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20 * @param [in] to_install strv of DER encoded certificates to be added.
fac7e1b0e558 Add nss store calling function and use it in cinst
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21 * @param [in] to_remove strv of DER encoded certificates to be remvoed.
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22 * @param [in] uid_t uid of the user to install certificates for.
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23 * @param [in] gid_t the gid of the user to install certificates for.
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24 * @param [in] homedir the homedir of the user.
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25 *
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26 * @returns childs pid on success. -1 on failure
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27 */
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28 static int
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Andre Heinecke <andre.heinecke@intevation.de>
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29 start_procces_for_user (char **to_install, char **to_remove,
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30 uid_t uid, gid_t gid, char *homedir)
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31 {
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32 int pipe_fd[2];
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33 pid_t pid = 0;
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34 char *argv[] = {"mozilla", NULL},
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35 *envp[2];
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36 size_t homedir_len = 0;
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37 int ret = -1,
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38 i = 0;
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39 FILE *stream = NULL;
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40 bool success = false;
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41
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42 if (homedir == NULL)
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43 {
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44 ERRORPRINTF ("Invalid call to start_process_for_user\n");
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45 return -1;
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46 }
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47
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48 homedir_len = strlen (homedir);
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49
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50 /* Allocate space for HOME=homedir\0 */
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51 envp[0] = xmalloc (homedir_len + 6);
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52 envp[1] = NULL;
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53
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54 ret = snprintf (envp[0], homedir_len + 6, "HOME=%s", homedir);
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55
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56 if (ret < 0 || (size_t) ret != homedir_len + 5)
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57 {
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58 ERRORPRINTF ("Error setting home env variable.\n");
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59 xfree (envp[0]);
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60 return -1;
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61 }
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62
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63 DEBUGPRINTF ("Home: %s \n", envp[0]);
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64
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65 if (pipe (pipe_fd))
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66 {
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67 ERRORPRINTF ("Failed to create pipe.\n");
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68 return -1;
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69 }
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70
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71 pid = fork();
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72
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73 if (pid == (pid_t) -1)
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74 {
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75 ERRORPRINTF ("Failed to fork child.\n");
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76 return -1;
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77 }
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78
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79 if (pid == (pid_t) 0)
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80 {
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81 /* Drop privileges */
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82 if (setuid (uid) || setgid (gid))
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83 {
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84 exit(-1);
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85 }
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86
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87 close (pipe_fd[1]);
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88 dup2 (pipe_fd[0], 0);
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89 close (pipe_fd[0]);
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90 /* TODO find path based on current executable */
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91 execve ("mozilla", argv, envp);
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92 exit (127);
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93 }
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94
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95 close (pipe_fd[0]);
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96 stream = fdopen(pipe_fd[1], "w");
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97 if (stream == NULL)
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98 {
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99 ERRORPRINTF ("Failed to open pipe for writing\n");
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100 goto done;
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101 }
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102
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103 /* Send the instructions */
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104 for (i = 0; to_install && to_install[i]; i++)
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105 {
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106 if (fprintf (stream, "I:%s\n", to_install[i]) <= 3)
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107 {
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108 ERRORPRINTF ("Write failed \n");
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109 goto done;
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110 }
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111 }
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112
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113 for (i = 0; to_remove && to_remove[i]; i++)
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114 {
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115 if (fprintf (stream, "R:%s\n", to_remove[i]) <= 3)
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116 {
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117 ERRORPRINTF ("Write failed \n");
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118 goto done;
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119 }
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120 }
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121
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122 success = true;
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123
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124 done:
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125 if (stream) {
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126 fclose (stream);
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127 }
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128 xfree (envp[0]);
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129 close(pipe_fd[0]);
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130 close(pipe_fd[1]);
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131
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132 if (success)
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133 {
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134 return pid;
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135 }
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136 return -1;
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137 }
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138
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139 int
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140 write_stores_nss (char **to_install, char **to_remove)
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141 {
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142 uid_t my_uid = getuid();
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143
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144 if (my_uid != 0)
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145 {
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146 /* Running as a user */
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147 char *homedir = getenv ("HOME");
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148 pid_t childprocess = -1; /* Only one child for single user installation */
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149 int status = -1;
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150 if (!homedir)
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151 {
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152 ERRORPRINTF ("Failed to find home directory\n");
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153 }
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154
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155 childprocess = start_procces_for_user (to_install, to_remove,
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156 my_uid, getgid(), homedir);
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157
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158 if (childprocess == -1)
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159 {
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160 ERRORPRINTF ("Failed to start childprocess!\n");
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161 return -1;
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162 }
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163
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164 childprocess = waitpid (childprocess, &status, 0);
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165 if (childprocess == -1 || !WIFEXITED(status))
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166 {
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167 ERRORPRINTF ("Waitpid failed.\n");
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168 return -1;
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169 }
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170 DEBUGPRINTF ("Child returned status: %i", WEXITSTATUS(status));
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171
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172 return 0;
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173 }
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174 printf ("Installation as root is not yet implemented\n");
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175 /* TODO root parse /etc/passwd for users with a home directory */
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176 return 0;
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177 }
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178 #endif
http://wald.intevation.org/projects/trustbridge/