1 | /* This file is stolen and slightly modified code */ |
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2 | |
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3 | /* zcrypt.c -- Read in a data stream from stdin & dump a decrypted/encrypted * |
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4 | * datastream. Reads the string to make the key from from the first * |
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5 | * parameter. Encrypts or decrypts according to -d or -e flag. (-e is * |
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6 | * default.) Will invoke zwrite if the -c option is provided for * |
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7 | * encryption. If a zephyr class is specified & the keyfile name omitted * |
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8 | * the ~/.crypt-table will be checked for "crypt-classname" and then * |
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9 | * "crypt-default" for the keyfile name. */ |
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10 | |
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11 | #include <stdio.h> |
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12 | #include <stdlib.h> |
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13 | #include <string.h> |
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14 | #include <sys/types.h> |
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15 | #include <sys/wait.h> |
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16 | #include "owl.h" |
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17 | |
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18 | #ifdef OWL_ENABLE_ZCRYPT |
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19 | |
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20 | #define BASE_CODE 70 |
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21 | #define LAST_CODE (BASE_CODE + 15) |
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22 | #define OUTPUT_BLOCK_SIZE 16 |
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23 | #include <unistd.h> |
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24 | #include <sys/types.h> |
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25 | |
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26 | #ifdef HAVE_KERBEROS_IV |
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27 | #include <kerberosIV/des.h> |
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28 | #else |
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29 | #include <openssl/des.h> |
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30 | #endif |
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31 | |
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32 | #define MAX_KEY 128 |
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33 | |
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34 | #ifndef TRUE |
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35 | #define TRUE -1 |
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36 | #endif |
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37 | #ifndef FALSE |
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38 | #define FALSE 0 |
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39 | #endif |
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40 | |
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41 | #define ZWRITE_OPT_NOAUTH (1<<0) |
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42 | #define ZWRITE_OPT_SIGNATURE (1<<1) |
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43 | #define ZWRITE_OPT_IGNOREVARS (1<<2) |
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44 | #define ZWRITE_OPT_VERBOSE (1<<3) |
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45 | #define ZWRITE_OPT_QUIET (1<<4) |
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46 | #define ZCRYPT_OPT_MESSAGE (1<<5) |
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47 | #define ZCRYPT_OPT_IGNOREDOT (1<<6) |
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48 | |
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49 | typedef struct |
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50 | { |
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51 | int flags; |
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52 | char *signature; |
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53 | char *message; |
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54 | } ZWRITEOPTIONS; |
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55 | |
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56 | char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance); |
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57 | |
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58 | #define M_NONE 0 |
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59 | #define M_ZEPHYR_ENCRYPT 1 |
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60 | #define M_DECRYPT 2 |
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61 | #define M_ENCRYPT 3 |
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62 | #define M_RANDOMIZE 4 |
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63 | #define M_SETKEY 5 |
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64 | |
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65 | static void owl_zcrypt_string_to_schedule(const char *keystring, des_key_schedule *schedule) { |
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66 | #ifdef HAVE_KERBEROS_IV |
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67 | des_cblock key; |
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68 | #else |
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69 | des_cblock _key, *key = &_key; |
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70 | #endif |
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71 | |
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72 | des_string_to_key(keystring, key); |
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73 | des_key_sched(key, *schedule); |
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74 | } |
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75 | |
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76 | /* The 'owl_zcrypt_decrypt' function was written by kretch for Owl. |
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77 | * Decrypt the message in 'in' on class 'class' and instance |
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78 | * 'instance'. Return must be freed by caller. |
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79 | */ |
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80 | char *owl_zcrypt_decrypt(const char *in, const char *class, const char *instance) |
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81 | { |
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82 | char *fname, keystring[MAX_KEY]; |
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83 | FILE *fkey; |
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84 | |
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85 | fname=GetZephyrVarKeyFile("zcrypt", class, instance); |
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86 | if (!fname) return NULL; |
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87 | fkey=fopen(fname, "r"); |
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88 | if (!fkey) return NULL; |
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89 | if (!fgets(keystring, MAX_KEY-1, fkey)) { |
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90 | fclose(fkey); |
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91 | return NULL; |
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92 | } |
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93 | fclose(fkey); |
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94 | |
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95 | return owl_zcrypt_decrypt_with_key(in, keystring); |
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96 | } |
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97 | |
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98 | char *owl_zcrypt_decrypt_with_key(const char *in, const char *keystring) |
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99 | { |
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100 | const char *inptr, *endptr; |
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101 | char *out; |
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102 | des_key_schedule schedule; |
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103 | unsigned char input[8], output[8]; |
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104 | int i, c1, c2; |
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105 | |
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106 | out = owl_malloc(strlen(in) * 16 + 20); |
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107 | |
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108 | strcpy(out, ""); |
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109 | |
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110 | output[0] = '\0'; /* In case no message at all */ |
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111 | |
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112 | owl_zcrypt_string_to_schedule(keystring, &schedule); |
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113 | |
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114 | inptr=in; |
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115 | endptr=in+strlen(in)-1; |
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116 | while (inptr<endptr) { |
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117 | for (i=0; i<8; i++) { |
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118 | c1=(inptr[0])-BASE_CODE; |
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119 | c2=(inptr[1])-BASE_CODE; |
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120 | input[i]=c1 * 0x10 + c2; |
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121 | inptr+=2; |
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122 | } |
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123 | des_ecb_encrypt(&input, &output, schedule, FALSE); |
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124 | strncat(out, (const char *)output, 8); |
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125 | } |
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126 | |
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127 | return out; |
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128 | } |
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129 | |
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130 | char *owl_zcrypt_encrypt(const char *in, const char *class, const char *instance) |
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131 | { |
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132 | char *fname, keystring[MAX_KEY]; |
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133 | FILE *fkey; |
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134 | |
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135 | fname=GetZephyrVarKeyFile("zcrypt", class, instance); |
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136 | if (!fname) return NULL; |
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137 | fkey=fopen(fname, "r"); |
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138 | if (!fkey) return NULL; |
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139 | if (!fgets(keystring, MAX_KEY-1, fkey)) { |
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140 | fclose(fkey); |
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141 | return NULL; |
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142 | } |
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143 | fclose(fkey); |
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144 | |
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145 | return owl_zcrypt_encrypt_with_key(in, keystring); |
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146 | } |
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147 | |
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148 | char *owl_zcrypt_encrypt_with_key(const char *in, const char *keystring) |
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149 | { |
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150 | des_key_schedule schedule; |
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151 | char *out; |
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152 | unsigned char input[8], output[8]; |
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153 | int size, length, i; |
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154 | const char *inbuff = NULL, *inptr; |
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155 | int num_blocks=0, last_block_size=0; |
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156 | |
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157 | owl_zcrypt_string_to_schedule(keystring, &schedule); |
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158 | |
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159 | /* Allocate enough space for the crypted message. For each byte of |
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160 | * the message, the encoded cyphertext will have two bytes. Block |
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161 | * size is 8 bytes of input, or 16 bytes of output, so make sure we |
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162 | * have at least one block worth of space allocated. If the message |
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163 | * is empty, no blocks are sent, but we still allocate one |
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164 | * block. The additional 16 bytes also provide space for the null |
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165 | * terminator, as we will never use all of it for cyphertext. |
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166 | */ |
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167 | out = owl_malloc((strlen(in) * 2) + 16); |
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168 | |
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169 | inbuff=in; |
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170 | length=strlen(inbuff); |
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171 | num_blocks=(length+7)/8; |
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172 | last_block_size=((length+7)%8)+1; |
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173 | |
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174 | strcpy(out, ""); |
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175 | |
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176 | inptr=inbuff; |
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177 | while (TRUE) { |
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178 | /* Get 8 bytes from buffer */ |
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179 | if (num_blocks > 1) { |
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180 | size = 8; |
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181 | memcpy(input, inptr, size); |
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182 | inptr+=8; |
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183 | num_blocks--; |
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184 | } else if (num_blocks == 1) { |
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185 | size=last_block_size; |
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186 | memcpy(input, inptr, size); |
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187 | num_blocks--; |
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188 | } else { |
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189 | size=0; |
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190 | } |
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191 | |
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192 | /* Check for EOF and pad the string to 8 chars, if needed */ |
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193 | if (size == 0) break; /* END OF INPUT: BREAK FROM while LOOP! */ |
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194 | |
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195 | if (size<8) memset(input + size, 0, 8 - size); |
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196 | |
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197 | /* Encrypt and output the block */ |
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198 | des_ecb_encrypt(&input, &output, schedule, TRUE); |
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199 | |
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200 | for (i = 0; i < 8; i++) { |
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201 | sprintf(out + strlen(out), "%c", ((output[i] & 0xf0) >> 4) + BASE_CODE); |
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202 | sprintf(out + strlen(out), "%c", (output[i] & 0x0f) + BASE_CODE); |
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203 | } |
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204 | |
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205 | if (size < 8) break; |
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206 | } |
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207 | return out; |
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208 | } |
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209 | |
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210 | |
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211 | #define MAX_BUFF 258 |
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212 | #define MAX_SEARCH 3 |
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213 | /* Find the class/instance in the .crypt-table */ |
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214 | char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance) { |
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215 | char *keyfile = NULL; |
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216 | char *varname[MAX_SEARCH]; |
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217 | int length[MAX_SEARCH], i; |
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218 | char buffer[MAX_BUFF]; |
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219 | char *filename; |
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220 | char result[MAX_SEARCH][MAX_BUFF]; |
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221 | int numsearch = 0; |
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222 | FILE *fsearch; |
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223 | |
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224 | memset(varname, 0, sizeof(varname)); |
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225 | |
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226 | /* Determine names to look for in .crypt-table */ |
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227 | if (instance) { |
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228 | varname[numsearch++] = owl_sprintf("crypt-%s-%s:", (class?class:"message"), instance); |
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229 | } |
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230 | if (class) { |
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231 | varname[numsearch++] = owl_sprintf("crypt-%s:", class); |
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232 | } |
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233 | varname[numsearch++] = owl_strdup("crypt-default:"); |
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234 | |
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235 | /* Setup the result array, and determine string lengths */ |
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236 | for (i = 0; i < numsearch; i++) { |
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237 | result[i][0] = '\0'; |
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238 | length[i] = strlen(varname[i]); |
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239 | } |
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240 | |
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241 | /* Open~/.crypt-table */ |
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242 | filename = owl_sprintf("%s/.crypt-table", getenv("HOME")); |
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243 | fsearch = fopen(filename, "r"); |
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244 | if (fsearch) { |
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245 | /* Scan file for a match */ |
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246 | while (!feof(fsearch)) { |
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247 | if (!fgets(buffer, MAX_BUFF - 3, fsearch)) break; |
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248 | for (i = 0; i < numsearch; i++) { |
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249 | if (strncasecmp(varname[i], buffer, length[i]) == 0) { |
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250 | int j; |
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251 | for (j = length[i]; buffer[j] == ' '; j++) |
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252 | ; |
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253 | strcpy(result[i], &buffer[j]); |
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254 | if (*result[i]) { |
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255 | if (result[i][strlen(result[i])-1] == '\n') { |
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256 | result[i][strlen(result[i])-1] = '\0'; |
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257 | } |
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258 | } |
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259 | } |
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260 | } |
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261 | } |
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262 | |
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263 | /* Pick the "best" match found */ |
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264 | keyfile = NULL; |
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265 | for (i = 0; i < numsearch; i++) { |
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266 | if (*result[i]) { |
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267 | keyfile = result[i]; |
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268 | break; |
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269 | } |
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270 | } |
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271 | |
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272 | if (keyfile == NULL) { |
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273 | /* printf("Could not find key table entry.\n"); */ |
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274 | } else { |
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275 | /* Prepare result to be returned */ |
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276 | keyfile = owl_strdup(keyfile); |
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277 | } |
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278 | |
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279 | fclose(fsearch); |
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280 | } else { |
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281 | /* printf("Could not open key table file: %s\n", filename); */ |
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282 | } |
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283 | |
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284 | for(i = 0; i < MAX_SEARCH; i++) { |
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285 | owl_free(varname[i]); |
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286 | } |
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287 | |
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288 | owl_free(filename); |
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289 | |
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290 | return(keyfile); |
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291 | } |
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292 | |
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293 | #endif |
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