[d309eb3] | 1 | /* This file is stolen and slightly modified code */ |
---|
| 2 | |
---|
| 3 | /* zcrypt.c -- Read in a data stream from stdin & dump a decrypted/encrypted * |
---|
| 4 | * datastream. Reads the string to make the key from from the first * |
---|
| 5 | * parameter. Encrypts or decrypts according to -d or -e flag. (-e is * |
---|
| 6 | * default.) Will invoke zwrite if the -c option is provided for * |
---|
| 7 | * encryption. If a zephyr class is specified & the keyfile name omitted * |
---|
| 8 | * the ~/.crypt-table will be checked for "crypt-classname" and then * |
---|
| 9 | * "crypt-default" for the keyfile name. */ |
---|
| 10 | |
---|
| 11 | #include <stdio.h> |
---|
| 12 | #include <stdlib.h> |
---|
| 13 | #include <string.h> |
---|
| 14 | #include <sys/types.h> |
---|
| 15 | #include <sys/wait.h> |
---|
[ac70242] | 16 | #include "owl.h" |
---|
[d309eb3] | 17 | |
---|
[c86a35c] | 18 | #ifdef OWL_ENABLE_ZCRYPT |
---|
[c269e22] | 19 | |
---|
[d309eb3] | 20 | #define BASE_CODE 70 |
---|
| 21 | #define LAST_CODE (BASE_CODE + 15) |
---|
| 22 | #define OUTPUT_BLOCK_SIZE 16 |
---|
| 23 | #include <unistd.h> |
---|
| 24 | #include <sys/types.h> |
---|
| 25 | #include <des.h> |
---|
| 26 | |
---|
| 27 | #define MAX_KEY 128 |
---|
| 28 | |
---|
| 29 | #ifndef TRUE |
---|
| 30 | #define TRUE -1 |
---|
| 31 | #endif |
---|
| 32 | #ifndef FALSE |
---|
| 33 | #define FALSE 0 |
---|
| 34 | #endif |
---|
| 35 | |
---|
| 36 | #define ZWRITE_OPT_NOAUTH (1<<0) |
---|
| 37 | #define ZWRITE_OPT_SIGNATURE (1<<1) |
---|
| 38 | #define ZWRITE_OPT_IGNOREVARS (1<<2) |
---|
| 39 | #define ZWRITE_OPT_VERBOSE (1<<3) |
---|
| 40 | #define ZWRITE_OPT_QUIET (1<<4) |
---|
| 41 | #define ZCRYPT_OPT_MESSAGE (1<<5) |
---|
| 42 | #define ZCRYPT_OPT_IGNOREDOT (1<<6) |
---|
| 43 | |
---|
| 44 | typedef struct |
---|
| 45 | { |
---|
| 46 | int flags; |
---|
| 47 | char *signature; |
---|
| 48 | char *message; |
---|
| 49 | } ZWRITEOPTIONS; |
---|
| 50 | |
---|
[e19eb97] | 51 | char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance); |
---|
[d309eb3] | 52 | |
---|
| 53 | #define M_NONE 0 |
---|
| 54 | #define M_ZEPHYR_ENCRYPT 1 |
---|
| 55 | #define M_DECRYPT 2 |
---|
| 56 | #define M_ENCRYPT 3 |
---|
| 57 | #define M_RANDOMIZE 4 |
---|
| 58 | #define M_SETKEY 5 |
---|
| 59 | |
---|
[9ceee9d] | 60 | /* The 'owl_zcrypt_decrypt' function was written by kretch for Owl. |
---|
| 61 | * Decrypt the message in 'in' on class 'class' and instance |
---|
| 62 | * 'instance' and leave the result in 'out'. Out must be a buffer |
---|
| 63 | * allocated by the caller. |
---|
| 64 | * |
---|
| 65 | * return 0 on success, otherwise -1 |
---|
| 66 | */ |
---|
[e19eb97] | 67 | int owl_zcrypt_decrypt(char *out, const char *in, const char *class, const char *instance) { |
---|
| 68 | const char *inptr, *endptr; |
---|
[65b2173] | 69 | char *fname, keystring[MAX_KEY]; |
---|
[d309eb3] | 70 | FILE *fkey; |
---|
| 71 | des_cblock key; |
---|
| 72 | des_key_schedule schedule; |
---|
| 73 | char input[8], output[9]; |
---|
| 74 | int i, c1, c2; |
---|
| 75 | |
---|
| 76 | fname=GetZephyrVarKeyFile("zcrypt", class, instance); |
---|
[9ceee9d] | 77 | if (!fname) return(-1); |
---|
[d309eb3] | 78 | fkey=fopen(fname, "r"); |
---|
| 79 | if (!fkey) return(-1); |
---|
| 80 | fgets(keystring, MAX_KEY-1, fkey); |
---|
| 81 | fclose(fkey); |
---|
| 82 | |
---|
| 83 | strcpy(out, ""); |
---|
| 84 | |
---|
| 85 | output[0] = '\0'; /* In case no message at all */ |
---|
| 86 | output[8] = '\0'; /* NULL at end will limit string length to 8 */ |
---|
| 87 | |
---|
| 88 | des_string_to_key(keystring, key); |
---|
| 89 | des_key_sched(key, schedule); |
---|
| 90 | |
---|
| 91 | inptr=in; |
---|
| 92 | endptr=in+strlen(in)-1; |
---|
| 93 | while (inptr<endptr) { |
---|
| 94 | for (i=0; i<8; i++) { |
---|
| 95 | c1=(inptr[0])-BASE_CODE; |
---|
| 96 | c2=(inptr[1])-BASE_CODE; |
---|
| 97 | input[i]=c1 * 0x10 + c2; |
---|
| 98 | inptr+=2; |
---|
| 99 | } |
---|
| 100 | des_ecb_encrypt(input, output, schedule, FALSE); |
---|
| 101 | strcat(out, output); |
---|
| 102 | } |
---|
| 103 | |
---|
| 104 | if (output[0]) { |
---|
| 105 | if (output[strlen(output)-1] != '\n') { |
---|
| 106 | strcat(out, "\n"); |
---|
| 107 | } |
---|
| 108 | } else { |
---|
| 109 | strcat(out, "\n"); |
---|
| 110 | } |
---|
| 111 | return(0); |
---|
| 112 | } |
---|
| 113 | |
---|
[e19eb97] | 114 | int owl_zcrypt_encrypt(char *out, const char *in, const char *class, const char *instance) { |
---|
[9ceee9d] | 115 | char *fname, keystring[MAX_KEY]; |
---|
| 116 | FILE *fkey; |
---|
| 117 | des_cblock key; |
---|
| 118 | des_key_schedule schedule; |
---|
| 119 | char input[8], output[8]; |
---|
| 120 | int size, length, i; |
---|
[e19eb97] | 121 | const char *inbuff = NULL, *inptr; |
---|
[9ceee9d] | 122 | int use_buffer = FALSE; |
---|
| 123 | int num_blocks=0, last_block_size=0; |
---|
| 124 | |
---|
| 125 | fname=GetZephyrVarKeyFile("zcrypt", class, instance); |
---|
| 126 | if (!fname) return(-1); |
---|
| 127 | fkey=fopen(fname, "r"); |
---|
| 128 | if (!fkey) return(-1); |
---|
| 129 | fgets(keystring, MAX_KEY-1, fkey); |
---|
| 130 | fclose(fkey); |
---|
| 131 | |
---|
| 132 | des_string_to_key(keystring, key); |
---|
| 133 | des_key_sched(key, schedule); |
---|
| 134 | |
---|
| 135 | inbuff=in; |
---|
| 136 | length=strlen(inbuff); |
---|
| 137 | num_blocks=(length+7)/8; |
---|
| 138 | last_block_size=((length+7)%8)+1; |
---|
| 139 | use_buffer=TRUE; |
---|
| 140 | |
---|
| 141 | strcpy(out, ""); |
---|
| 142 | |
---|
| 143 | inptr=inbuff; |
---|
| 144 | while (TRUE) { |
---|
| 145 | /* Get 8 bytes from buffer */ |
---|
| 146 | if (num_blocks > 1) { |
---|
| 147 | size = 8; |
---|
| 148 | memcpy(input, inptr, size); |
---|
| 149 | inptr+=8; |
---|
| 150 | num_blocks--; |
---|
| 151 | } else if (num_blocks == 1) { |
---|
| 152 | size=last_block_size; |
---|
| 153 | memcpy(input, inptr, size); |
---|
| 154 | num_blocks--; |
---|
| 155 | } else { |
---|
| 156 | size=0; |
---|
| 157 | } |
---|
| 158 | |
---|
| 159 | /* Check for EOF and pad the string to 8 chars, if needed */ |
---|
| 160 | if (size == 0) break; /* END OF INPUT: BREAK FROM while LOOP! */ |
---|
| 161 | |
---|
| 162 | if (size<8) memset(input + size, 0, 8 - size); |
---|
| 163 | |
---|
| 164 | /* Encrypt and output the block */ |
---|
| 165 | des_ecb_encrypt(input, output, schedule, TRUE); |
---|
| 166 | |
---|
| 167 | for (i = 0; i < 8; i++) { |
---|
[b9cb41b] | 168 | sprintf(out + strlen(out), "%c", ((output[i] & 0xf0) >> 4) + BASE_CODE); |
---|
| 169 | sprintf(out + strlen(out), "%c", (output[i] & 0x0f) + BASE_CODE); |
---|
[9ceee9d] | 170 | } |
---|
| 171 | |
---|
| 172 | if (size < 8) break; |
---|
| 173 | } |
---|
[e3869df] | 174 | return(0); |
---|
[d309eb3] | 175 | } |
---|
| 176 | |
---|
| 177 | |
---|
| 178 | #define MAX_BUFF 258 |
---|
| 179 | #define MAX_SEARCH 3 |
---|
| 180 | /* Find the class/instance in the .crypt-table */ |
---|
[e19eb97] | 181 | char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance) { |
---|
[e3869df] | 182 | char *keyfile = NULL; |
---|
[8412869] | 183 | char *varname[MAX_SEARCH]; |
---|
[d309eb3] | 184 | int length[MAX_SEARCH], i; |
---|
| 185 | char buffer[MAX_BUFF]; |
---|
[8412869] | 186 | char *filename; |
---|
[d309eb3] | 187 | char result[MAX_SEARCH][MAX_BUFF]; |
---|
| 188 | int numsearch = 0; |
---|
| 189 | FILE *fsearch; |
---|
| 190 | |
---|
[8412869] | 191 | memset(varname, 0, sizeof(varname)); |
---|
| 192 | |
---|
[d309eb3] | 193 | /* Determine names to look for in .crypt-table */ |
---|
| 194 | if (instance) { |
---|
[8412869] | 195 | varname[numsearch++] = owl_sprintf("crypt-%s-%s:", (class?class:"message"), instance); |
---|
[d309eb3] | 196 | } |
---|
| 197 | if (class) { |
---|
[8412869] | 198 | varname[numsearch++] = owl_sprintf("crypt-%s:", class); |
---|
[d309eb3] | 199 | } |
---|
[8412869] | 200 | varname[numsearch++] = owl_strdup("crypt-default:"); |
---|
[d309eb3] | 201 | |
---|
| 202 | /* Setup the result array, and determine string lengths */ |
---|
| 203 | for (i = 0; i < numsearch; i++) { |
---|
| 204 | result[i][0] = '\0'; |
---|
| 205 | length[i] = strlen(varname[i]); |
---|
| 206 | } |
---|
| 207 | |
---|
| 208 | /* Open~/.crypt-table */ |
---|
[8412869] | 209 | filename = owl_sprintf("%s/.crypt-table", getenv("HOME")); |
---|
[d309eb3] | 210 | fsearch = fopen(filename, "r"); |
---|
| 211 | if (fsearch) { |
---|
| 212 | /* Scan file for a match */ |
---|
| 213 | while (!feof(fsearch)) { |
---|
| 214 | fgets(buffer, MAX_BUFF - 3, fsearch); |
---|
| 215 | for (i = 0; i < numsearch; i++) { |
---|
| 216 | if (strncasecmp(varname[i], buffer, length[i]) == 0) { |
---|
| 217 | int j; |
---|
| 218 | for (j = length[i]; buffer[j] == ' '; j++) |
---|
| 219 | ; |
---|
| 220 | strcpy(result[i], &buffer[j]); |
---|
| 221 | if (*result[i]) { |
---|
| 222 | if (result[i][strlen(result[i])-1] == '\n') { |
---|
| 223 | result[i][strlen(result[i])-1] = '\0'; |
---|
| 224 | } |
---|
| 225 | } |
---|
| 226 | } |
---|
| 227 | } |
---|
| 228 | } |
---|
| 229 | |
---|
| 230 | /* Pick the "best" match found */ |
---|
| 231 | keyfile = NULL; |
---|
| 232 | for (i = 0; i < numsearch; i++) { |
---|
| 233 | if (*result[i]) { |
---|
| 234 | keyfile = result[i]; |
---|
| 235 | break; |
---|
| 236 | } |
---|
| 237 | } |
---|
| 238 | |
---|
| 239 | if (keyfile == NULL) { |
---|
[9ceee9d] | 240 | /* printf("Could not find key table entry.\n"); */ |
---|
[d309eb3] | 241 | } else { |
---|
| 242 | /* Prepare result to be returned */ |
---|
[36486be] | 243 | keyfile = owl_strdup(keyfile); |
---|
[d309eb3] | 244 | } |
---|
| 245 | |
---|
| 246 | fclose(fsearch); |
---|
| 247 | } else { |
---|
[9ceee9d] | 248 | /* printf("Could not open key table file: %s\n", filename); */ |
---|
[d309eb3] | 249 | } |
---|
| 250 | |
---|
[8412869] | 251 | for(i = 0; i < MAX_SEARCH; i++) { |
---|
| 252 | owl_free(varname[i]); |
---|
| 253 | } |
---|
| 254 | |
---|
| 255 | owl_free(filename); |
---|
| 256 | |
---|
[d309eb3] | 257 | return(keyfile); |
---|
| 258 | } |
---|
| 259 | |
---|
| 260 | static pid_t zephyrpipe_pid = 0; |
---|
| 261 | |
---|
[c269e22] | 262 | #endif |
---|