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annotate cinst/main.c @ 64:fb9f78f7ab2f

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Improve error handling free memory before exiting. Include line endings in Marker lines
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 18 Mar 2014 14:14:15 +0000
parents 6acb1dae6185
children e4088afd5281
rev   line source
25
92108a2120f1 Move certificatelist to common. Add cinst directory
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1 /** @brief Main entry point for the cinst process.
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2 *
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3 * The cinst process may or may not be run with elevated
92108a2120f1 Move certificatelist to common. Add cinst directory
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4 * privileges. When run with elevated privileges this
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5 * process will modify system wide certificate stores.
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6 * Otherwise only the users certificate stores are modified.
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7 *
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8 * It expects a certificatelist on stdin enclosed in a
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9 * -----BEGIN CERTIFICATE LIST-----
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10 * ...
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11 * -----END CERTIFICATE LIST-----
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12 *
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13 * Followed by additional instruction lines of:
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14 * I:<certificate>
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15 * R:<certificate>
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16 *
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17 * It will only execute the instructions if the
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18 * I and R instructions are also part of the signed
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19 * certificate list. The signature is validated with the
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20 * built in key.
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21 *
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22 * The special instruction "UNINSTALL" will cause the installer
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23 * to remove all certificates (Even those marked with I) that
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24 * are part of the list to be removed.
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25 *
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26 **/
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27 #define MAX_LINE_LENGTH 1000
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28 #define MAX_LINES 1000
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29 #define MAX_INPUT_SIZE 2000000 /* MAX_LINE_LENGTH * (MAX_LINES *2) */
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31 #include <stdio.h>
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32 #include <stdlib.h>
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33 #include <string.h>
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34 #include <assert.h>
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35
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36 #include "strhelp.h"
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37 #include "listutil.h"
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38 #include "errorcodes.h"
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39
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40 /* @brief Read stdin into data structures.
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41 *
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42 * Reads from stdin and sorts the input into the respective
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43 * variables. The pointers returned need to be freed by the caller.
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44 * Terminates in OOM conditions.
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45 *
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46 * The caller needs to free the memory allocated by this function
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47 * even when an error is returned.
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48 *
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49 * @returns: 0 on success. An error code otherwise.
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50 */
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51 int readInput(char **certificate_list, char ***to_install,
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52 char ***to_remove)
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53 {
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54 int lines_read = 0;
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55 int readingList = 0;
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56 char buf[MAX_LINE_LENGTH + 1];
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57
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58 while (fgets(buf, MAX_LINE_LENGTH + 1, stdin)) {
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59 size_t len = strlen(buf); /* fgets ensures buf is terminated */
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60 if (lines_read ++ > MAX_LINES) {
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61 printf("Too many lines\n");
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62 return ERR_TOO_MUCH_INPUT;
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63 }
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64 if (strcmp("-----BEGIN CERTIFICATE LIST-----\r\n", buf) == 0){
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65 readingList = 1;
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66 continue;
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67 }
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68 if (strcmp("-----END CERTIFICATE LIST-----\r\n", buf) == 0){
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69 readingList = 0;
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70 continue;
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71 }
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72 if (readingList) {
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73 str_append_str(certificate_list, buf, len);
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74 continue;
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75 }
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76 if (*buf == 'I') {
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77 array_append_str(to_install, buf+2, len - 2);
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78 continue;
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79 }
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80 if (*buf == 'R') {
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81 array_append_str(to_remove, buf+2, len - 2);
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82 continue;
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83 }
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84 if (strcmp("UNINSTALL", buf) == 0) {
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85 array_append_str(to_remove, buf, len - 2);
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86 }
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87 }
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88
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89 return 0;
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90 }
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91
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92 int validate_instructions(const char *certificate_list,
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93 const size_t listLen,
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94 const char **to_install,
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95 const char **to_remove)
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96 {
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97 /* TODO */
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98 return 0;
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99 }
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100
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101 int main() {
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102 char **to_install = NULL;
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103 char **to_remove = NULL;
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104 char *certificate_list = NULL;
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105 size_t listLen = 0;
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106 int ret = -1;
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107
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108 ret = readInput(&certificate_list, &to_install, &to_remove);
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109
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110 if (ret != 0) {
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111 return ret;
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112 }
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113
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114 if (!certificate_list) {
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115 return ERR_INVALID_INPUT_NO_LIST;
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116 }
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117
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118 listLen = strnlen(certificate_list, MAX_INPUT_SIZE);
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119
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120 ret = verify_list(certificate_list, listLen);
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121
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122 if (ret != 0) {
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123 return ERR_INVALID_SIGNATURE;
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124 }
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125
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126 if (!strv_length(to_install) && !strv_length(to_remove)) {
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127 return ERR_NO_INSTRUCTIONS;
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128 }
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129
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130 /* Check that the instructions are ok to execute */
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131 ret = validate_instructions(certificate_list, to_install, to_remove);
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132
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133 if (ret != 0) {
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134 return ERR_INVALID_INSTRUCTIONS;
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135 }
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136
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137 /* Make valgrind happy */
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138 strfreev (to_install);
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139 strfreev (to_remove);
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140 free (certificate_list);
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3f6378647371 Start work on cinst. Strhelp new helpers to work with C String
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141
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142 return 0;
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143 }
http://wald.intevation.org/projects/trustbridge/