Mercurial > trustbridge
annotate common/listutil.c @ 388:a507e5f1b999
Emit a signal if no errors happened during installation.
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Tue, 15 Apr 2014 19:03:56 +0200 |
parents | f6ce186cebc2 |
children | 17e1c8f37d72 |
rev | line source |
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1 #include "listutil.h" |
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2 |
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3 #include <stdio.h> |
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4 #include <stdlib.h> |
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5 #include <errno.h> |
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6 #include <fcntl.h> |
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7 #include <unistd.h> |
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8 #include <sys/types.h> |
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9 #include <sys/stat.h> |
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10 #include <string.h> |
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11 |
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12 #include "strhelp.h" |
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13 |
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14 #ifdef RELEASE_BUILD |
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15 #include "pubkey-release.h" |
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16 #else |
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17 #include "pubkey-test.h" |
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18 #endif |
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19 |
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20 #pragma GCC diagnostic ignored "-Wconversion" |
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21 /* Polarssl mh.h contains a conversion which gcc warns about */ |
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22 #include <polarssl/pk.h> |
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23 #include <polarssl/base64.h> |
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24 #include <polarssl/sha256.h> |
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25 #pragma GCC diagnostic pop |
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26 |
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27 #define MAX_FILESIZE (MAX_LINE_LENGTH * MAX_LINES) |
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28 |
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29 /** |
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30 * @brief Read a file into memory. |
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31 * |
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32 * The caller needs to free data |
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33 * |
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34 * @param[in] fileName Name of the file. |
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35 * @param[out] data the file content |
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36 * @param[out] size size in bytes of the file content. |
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37 * @param[in] max_size the maximum amount of bytes to read. |
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38 * |
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39 * @return 0 on success an error code otherwise. |
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40 */ |
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41 #define READ_FILE_UNREADABLE -1 |
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42 #define READ_FILE_TOO_LARGE -2 |
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43 #define READ_FILE_NO_MEMORY -3 |
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44 #define READ_FILE_READ_FAILED -4 |
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45 #define READ_FILE_INVALID_CALL -5 |
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46 static int read_file(const char *file_name, char **data, size_t *size, |
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47 const size_t max_size) |
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48 { |
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49 FILE *f; |
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50 long file_size; |
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51 |
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52 if (!file_name || !data || !size || !max_size) { |
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53 return READ_FILE_INVALID_CALL; |
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54 } |
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55 |
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56 f = fopen(file_name, "rb"); |
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57 if (f == NULL) |
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58 return READ_FILE_UNREADABLE; |
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59 |
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60 fseek(f, 0, SEEK_END); |
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61 file_size = ftell(f); |
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62 if (file_size <= 0){ |
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63 fclose(f); |
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64 return READ_FILE_UNREADABLE; |
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65 } |
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66 |
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67 fseek(f, 0, SEEK_SET); |
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68 |
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69 if (file_size + 1 == 0) { |
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70 fclose(f); |
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71 return READ_FILE_TOO_LARGE; |
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72 } |
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73 *size = (size_t) file_size; |
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74 |
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75 if (*size > max_size) { |
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76 fclose(f); |
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77 return READ_FILE_TOO_LARGE; |
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78 } |
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79 |
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80 *data = (char *) malloc( *size + 1 ); |
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81 if (*data == NULL) { |
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82 fclose(f); |
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83 return READ_FILE_NO_MEMORY; |
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84 } |
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85 |
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86 if (fread(*data, 1, *size, f) != *size) { |
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87 free(*data); |
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88 fclose(f); |
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89 return READ_FILE_READ_FAILED; |
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90 } |
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91 |
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92 fclose(f); |
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93 |
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94 (*data)[*size] = '\0'; |
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95 |
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96 return 0; |
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97 } |
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98 |
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99 int verify_list(const char *data, const size_t size) |
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100 { |
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101 int ret = -1; |
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102 pk_context pub_key_ctx; |
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103 char *p; |
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104 /* Fixed key size of 3072 implies the sizes*/ |
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105 const size_t sig_b64_size = 512; |
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106 size_t sig_size = 384; |
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107 |
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108 char signature_b64[sig_b64_size + 1]; |
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109 unsigned char signature[sig_size]; |
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110 /* Hash algroithm is sha256 */ |
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111 unsigned char hash[32]; |
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112 |
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113 if (!data || !size) { |
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114 return -1; |
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115 } |
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116 |
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117 /* Fetch the signature from the first line od data */ |
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118 p = strchr(data, '\r'); |
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119 if (p == 0 || (unsigned int)(p - (data + 2)) != sig_b64_size) { |
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120 /* printf("Invalid data. Signature might be too long.\n"); */ |
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121 return -1; |
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122 } |
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123 strncpy(signature_b64, data + 2, sig_b64_size); |
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124 signature_b64[sig_b64_size] = '\0'; |
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125 |
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126 ret = base64_decode(signature, &sig_size, |
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127 (unsigned char *)signature_b64, sig_b64_size); |
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128 |
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129 if (ret != 0 || sig_size != 384) { |
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130 /* printf("failed to decode signature\n"); */ |
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131 return -1; |
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132 } |
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133 |
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134 /* Hash is calculated over the data without the first line. |
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135 * linebreaks are \r\n so the first char of the new line is |
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136 * p+2 */ |
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137 p += 2; |
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138 /* Size of the data to hash is the size - signature line |
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139 * signature line is sig_b64_size - "S:" and - "\r\n" so -4*/ |
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140 sha256((unsigned char *)p, size - sig_b64_size - 4, hash, 0); |
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141 |
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142 pk_init(&pub_key_ctx); |
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143 #if 0 |
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144 { |
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145 int i; |
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146 FILE *foo = fopen("/tmp/testdump", "w"); |
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147 FILE *foo2 = fopen("/tmp/rawdump", "w"); |
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148 for (i=0; i< (int)(size - sig_b64_size - 2); i++) |
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149 fprintf (foo, "%c", p[i]); |
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150 for (i=0; i< (int)(size); i++) |
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151 fprintf (foo2, "%c", data[i]); |
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152 fclose(foo); |
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153 printf ("Hash: \n"); |
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154 for (i=0; i<32; i++) { |
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155 printf ("%x", hash[i]); |
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156 } |
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157 printf("\n"); |
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158 } |
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159 #endif |
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160 |
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161 ret = pk_parse_public_key(&pub_key_ctx, public_key_pem, |
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162 public_key_pem_size); |
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163 if (ret != 0) { |
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164 printf("pk_parse_public_key failed with -0x%04x\n\n", -ret); |
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165 pk_free(&pub_key_ctx); |
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166 return ret; |
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167 } |
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168 |
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169 ret = pk_verify(&pub_key_ctx, POLARSSL_MD_SHA256, hash, 0, |
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170 signature, sig_size); |
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171 |
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172 if (ret != 0) { |
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173 printf("pk_verify failed with -0x%04x\n\n", -ret); |
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174 } |
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175 pk_free(&pub_key_ctx); |
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176 |
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177 return ret; |
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178 } |
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179 |
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180 list_status_t read_and_verify_list(const char *file_name, char **data, |
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181 size_t *size) |
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182 { |
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183 list_status_t retval = UnknownError; |
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184 *data = NULL; |
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185 *size = 0; |
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186 int ret = 0; |
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187 |
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188 ret = read_file(file_name, data, size, MAX_FILESIZE); |
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189 |
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190 /* printf ("Ret: %i \n", ret); */ |
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191 if (ret != 0) { |
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192 if (ret == READ_FILE_TOO_LARGE) { |
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193 return TooLarge; |
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194 } |
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195 if (ret == READ_FILE_UNREADABLE) { |
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196 /* TODO: work with errno ? */ |
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197 /* errsv = errno; */ |
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198 /* perror("read_and_verify_list(), READ_FILE_UNREADABLE:"); */ |
31
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199 return SeekFailed; |
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200 } |
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201 if (ret == READ_FILE_READ_FAILED) { |
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202 /* TODO: work with ferror() or feof() ? */ |
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203 return ReadFailed; |
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204 } |
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205 return UnknownError; |
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206 } |
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207 |
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208 if (!*data || !*size) { |
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209 /* File is probably empty */ |
31
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210 return UnknownError; |
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211 } |
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212 |
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213 if (**data != 'S') { |
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214 retval = InvalidFormat; |
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215 } else { |
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216 ret = verify_list (*data, *size); |
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217 if (ret == 0) { |
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218 /* Hooray */ |
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219 return Valid; |
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220 } |
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221 if (ret == -1) { |
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222 /* our error */ |
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223 retval = InvalidFormat; |
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224 } else { |
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225 retval = InvalidSignature; |
31
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226 } |
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227 } |
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228 |
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229 if (retval != Valid && *data) { |
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230 free(*data); |
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231 *data = NULL; |
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232 *size = 0; |
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233 } |
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234 return retval; |
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235 } |
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236 |
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237 char ** |
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238 get_certs_from_list (char *data, const size_t size) |
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239 { |
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240 char *cur = data; |
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241 char **retval = NULL; |
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242 |
286
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243 if (!data || !size) |
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244 { |
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245 printf ("Invalid call to get_certs_to_remove \n"); |
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246 return NULL; |
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247 } |
286
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248 |
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249 while (cur) |
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250 { |
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251 char *next = strchr(cur, '\n'); |
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252 if (strlen(cur) > 3 && (cur[0] == 'I' || cur[0] == 'R') && |
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253 next - cur > 4) |
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254 { |
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255 size_t len = (size_t) (next - cur - 3); |
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256 /* Remove I: or R: at the beginning and \r\n at the end */ |
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257 strv_append(&retval, cur + 2, len); |
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258 } |
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259 cur = next ? (next + 1) : NULL; |
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260 } |
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261 return retval; |
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262 } |
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263 |