[d309eb3] | 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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[ac70242] | 16 | #include "owl.h" |
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[d309eb3] | 17 | |
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[c86a35c] | 18 | #ifdef OWL_ENABLE_ZCRYPT |
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[c269e22] | 19 | |
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[d309eb3] | 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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[806f769] | 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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[d309eb3] | 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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[e19eb97] | 56 | char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance); |
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[d309eb3] | 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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[3daca13] | 65 | static void owl_zcrypt_string_to_schedule(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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[9ceee9d] | 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' and leave the result in 'out'. Out must be a buffer |
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| 79 | * allocated by the caller. |
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| 80 | * |
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| 81 | * return 0 on success, otherwise -1 |
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| 82 | */ |
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[e19eb97] | 83 | int owl_zcrypt_decrypt(char *out, const char *in, const char *class, const char *instance) { |
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| 84 | const char *inptr, *endptr; |
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[65b2173] | 85 | char *fname, keystring[MAX_KEY]; |
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[d309eb3] | 86 | FILE *fkey; |
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| 87 | des_key_schedule schedule; |
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[3daca13] | 88 | unsigned char input[8], output[8]; |
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[d309eb3] | 89 | int i, c1, c2; |
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| 90 | |
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| 91 | fname=GetZephyrVarKeyFile("zcrypt", class, instance); |
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[9ceee9d] | 92 | if (!fname) return(-1); |
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[d309eb3] | 93 | fkey=fopen(fname, "r"); |
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| 94 | if (!fkey) return(-1); |
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[3daca13] | 95 | if (!fgets(keystring, MAX_KEY-1, fkey)) { |
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| 96 | fclose(fkey); |
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| 97 | return -1; |
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| 98 | } |
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[d309eb3] | 99 | fclose(fkey); |
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| 100 | |
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| 101 | strcpy(out, ""); |
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| 102 | |
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| 103 | output[0] = '\0'; /* In case no message at all */ |
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| 104 | |
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[3daca13] | 105 | owl_zcrypt_string_to_schedule(keystring, schedule); |
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[d309eb3] | 106 | |
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| 107 | inptr=in; |
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| 108 | endptr=in+strlen(in)-1; |
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| 109 | while (inptr<endptr) { |
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| 110 | for (i=0; i<8; i++) { |
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| 111 | c1=(inptr[0])-BASE_CODE; |
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| 112 | c2=(inptr[1])-BASE_CODE; |
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| 113 | input[i]=c1 * 0x10 + c2; |
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| 114 | inptr+=2; |
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| 115 | } |
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[3daca13] | 116 | des_ecb_encrypt(&input, &output, schedule, FALSE); |
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| 117 | strncat(out, (const char *)output, 8); |
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[d309eb3] | 118 | } |
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| 119 | |
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[3daca13] | 120 | if (out[0] && out[strlen(out) - 1] != '\n') |
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[d309eb3] | 121 | strcat(out, "\n"); |
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| 122 | return(0); |
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| 123 | } |
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| 124 | |
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[e19eb97] | 125 | int owl_zcrypt_encrypt(char *out, const char *in, const char *class, const char *instance) { |
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[9ceee9d] | 126 | char *fname, keystring[MAX_KEY]; |
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| 127 | FILE *fkey; |
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| 128 | des_key_schedule schedule; |
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[3daca13] | 129 | unsigned char input[8], output[8]; |
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[9ceee9d] | 130 | int size, length, i; |
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[e19eb97] | 131 | const char *inbuff = NULL, *inptr; |
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[9ceee9d] | 132 | int use_buffer = FALSE; |
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| 133 | int num_blocks=0, last_block_size=0; |
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| 134 | |
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| 135 | fname=GetZephyrVarKeyFile("zcrypt", class, instance); |
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| 136 | if (!fname) return(-1); |
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| 137 | fkey=fopen(fname, "r"); |
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| 138 | if (!fkey) return(-1); |
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[3daca13] | 139 | if (!fgets(keystring, MAX_KEY-1, fkey)) { |
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| 140 | fclose(fkey); |
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| 141 | return -1; |
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| 142 | } |
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[9ceee9d] | 143 | fclose(fkey); |
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| 144 | |
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[3daca13] | 145 | owl_zcrypt_string_to_schedule(keystring, schedule); |
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[9ceee9d] | 146 | |
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| 147 | inbuff=in; |
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| 148 | length=strlen(inbuff); |
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| 149 | num_blocks=(length+7)/8; |
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| 150 | last_block_size=((length+7)%8)+1; |
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| 151 | use_buffer=TRUE; |
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| 152 | |
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| 153 | strcpy(out, ""); |
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| 154 | |
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| 155 | inptr=inbuff; |
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| 156 | while (TRUE) { |
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| 157 | /* Get 8 bytes from buffer */ |
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| 158 | if (num_blocks > 1) { |
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| 159 | size = 8; |
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| 160 | memcpy(input, inptr, size); |
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| 161 | inptr+=8; |
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| 162 | num_blocks--; |
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| 163 | } else if (num_blocks == 1) { |
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| 164 | size=last_block_size; |
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| 165 | memcpy(input, inptr, size); |
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| 166 | num_blocks--; |
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| 167 | } else { |
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| 168 | size=0; |
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| 169 | } |
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| 170 | |
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| 171 | /* Check for EOF and pad the string to 8 chars, if needed */ |
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| 172 | if (size == 0) break; /* END OF INPUT: BREAK FROM while LOOP! */ |
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| 173 | |
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| 174 | if (size<8) memset(input + size, 0, 8 - size); |
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| 175 | |
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| 176 | /* Encrypt and output the block */ |
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[3daca13] | 177 | des_ecb_encrypt(&input, &output, schedule, TRUE); |
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[9ceee9d] | 178 | |
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| 179 | for (i = 0; i < 8; i++) { |
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[b9cb41b] | 180 | sprintf(out + strlen(out), "%c", ((output[i] & 0xf0) >> 4) + BASE_CODE); |
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| 181 | sprintf(out + strlen(out), "%c", (output[i] & 0x0f) + BASE_CODE); |
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[9ceee9d] | 182 | } |
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| 183 | |
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| 184 | if (size < 8) break; |
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| 185 | } |
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[e3869df] | 186 | return(0); |
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[d309eb3] | 187 | } |
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| 188 | |
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| 189 | |
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| 190 | #define MAX_BUFF 258 |
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| 191 | #define MAX_SEARCH 3 |
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| 192 | /* Find the class/instance in the .crypt-table */ |
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[e19eb97] | 193 | char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance) { |
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[e3869df] | 194 | char *keyfile = NULL; |
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[8412869] | 195 | char *varname[MAX_SEARCH]; |
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[d309eb3] | 196 | int length[MAX_SEARCH], i; |
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| 197 | char buffer[MAX_BUFF]; |
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[8412869] | 198 | char *filename; |
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[d309eb3] | 199 | char result[MAX_SEARCH][MAX_BUFF]; |
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| 200 | int numsearch = 0; |
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| 201 | FILE *fsearch; |
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| 202 | |
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[8412869] | 203 | memset(varname, 0, sizeof(varname)); |
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| 204 | |
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[d309eb3] | 205 | /* Determine names to look for in .crypt-table */ |
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| 206 | if (instance) { |
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[8412869] | 207 | varname[numsearch++] = owl_sprintf("crypt-%s-%s:", (class?class:"message"), instance); |
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[d309eb3] | 208 | } |
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| 209 | if (class) { |
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[8412869] | 210 | varname[numsearch++] = owl_sprintf("crypt-%s:", class); |
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[d309eb3] | 211 | } |
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[8412869] | 212 | varname[numsearch++] = owl_strdup("crypt-default:"); |
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[d309eb3] | 213 | |
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| 214 | /* Setup the result array, and determine string lengths */ |
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| 215 | for (i = 0; i < numsearch; i++) { |
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| 216 | result[i][0] = '\0'; |
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| 217 | length[i] = strlen(varname[i]); |
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| 218 | } |
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| 219 | |
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| 220 | /* Open~/.crypt-table */ |
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[8412869] | 221 | filename = owl_sprintf("%s/.crypt-table", getenv("HOME")); |
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[d309eb3] | 222 | fsearch = fopen(filename, "r"); |
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| 223 | if (fsearch) { |
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| 224 | /* Scan file for a match */ |
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| 225 | while (!feof(fsearch)) { |
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[3daca13] | 226 | if (!fgets(buffer, MAX_BUFF - 3, fsearch)) break; |
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[d309eb3] | 227 | for (i = 0; i < numsearch; i++) { |
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| 228 | if (strncasecmp(varname[i], buffer, length[i]) == 0) { |
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| 229 | int j; |
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| 230 | for (j = length[i]; buffer[j] == ' '; j++) |
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| 231 | ; |
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| 232 | strcpy(result[i], &buffer[j]); |
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| 233 | if (*result[i]) { |
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| 234 | if (result[i][strlen(result[i])-1] == '\n') { |
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| 235 | result[i][strlen(result[i])-1] = '\0'; |
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| 236 | } |
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| 237 | } |
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| 238 | } |
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| 239 | } |
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| 240 | } |
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| 241 | |
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| 242 | /* Pick the "best" match found */ |
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| 243 | keyfile = NULL; |
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| 244 | for (i = 0; i < numsearch; i++) { |
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| 245 | if (*result[i]) { |
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| 246 | keyfile = result[i]; |
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| 247 | break; |
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| 248 | } |
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| 249 | } |
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| 250 | |
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| 251 | if (keyfile == NULL) { |
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[9ceee9d] | 252 | /* printf("Could not find key table entry.\n"); */ |
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[d309eb3] | 253 | } else { |
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| 254 | /* Prepare result to be returned */ |
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[36486be] | 255 | keyfile = owl_strdup(keyfile); |
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[d309eb3] | 256 | } |
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| 257 | |
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| 258 | fclose(fsearch); |
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| 259 | } else { |
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[9ceee9d] | 260 | /* printf("Could not open key table file: %s\n", filename); */ |
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[d309eb3] | 261 | } |
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| 262 | |
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[8412869] | 263 | for(i = 0; i < MAX_SEARCH; i++) { |
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| 264 | owl_free(varname[i]); |
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| 265 | } |
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| 266 | |
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| 267 | owl_free(filename); |
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| 268 | |
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[d309eb3] | 269 | return(keyfile); |
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| 270 | } |
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| 271 | |
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[c269e22] | 272 | #endif |
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