[edae037] | 1 | /* zcrypt.c -- Read in a data stream from stdin & dump a decrypted/encrypted * |
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| 2 | * datastream. Reads the string to make the key from from the first * |
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| 3 | * parameter. Encrypts or decrypts according to -d or -e flag. (-e is * |
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| 4 | * default.) Will invoke zwrite if the -c option is provided for * |
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| 5 | * encryption. If a zephyr class is specified & the keyfile name omitted * |
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| 6 | * the ~/.crypt-table will be checked for "crypt-classname" and then * |
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| 7 | * "crypt-default" for the keyfile name. */ |
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| 8 | |
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| 9 | #include <stdio.h> |
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[6b1c3b6] | 10 | |
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[edae037] | 11 | #include <unistd.h> |
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| 12 | #include <sys/types.h> |
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| 13 | #include <zephyr/zephyr.h> |
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[6b1c3b6] | 14 | #include <glib.h> |
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[356465e] | 15 | #include <string.h> |
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| 16 | #include <stdlib.h> |
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| 17 | #include <sys/wait.h> |
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[8bd190d] | 18 | #include <ctype.h> |
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[edae037] | 19 | |
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[b094191] | 20 | #include "config.h" |
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| 21 | |
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[49bc81e] | 22 | #ifdef HAVE_KERBEROS_IV |
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| 23 | #include <kerberosIV/des.h> |
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| 24 | #else |
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| 25 | #include <openssl/des.h> |
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| 26 | #endif |
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| 27 | |
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[8bd190d] | 28 | #include "filterproc.h" |
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| 29 | |
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| 30 | #define MAX_KEY 128 |
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| 31 | #define MAX_LINE 128 |
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| 32 | #define MAX_RESULT 4096 |
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[edae037] | 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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[e832a52] | 56 | char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance); |
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| 57 | int ParseCryptSpec(const char *spec, const char **keyfile); |
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[edae037] | 58 | char *BuildArgString(char **argv, int start, int end); |
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[e832a52] | 59 | char *read_keystring(const char *keyfile); |
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[8bd190d] | 60 | |
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[e832a52] | 61 | int do_encrypt(int zephyr, const char *class, const char *instance, |
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| 62 | ZWRITEOPTIONS *zoptions, const char* keyfile, int cipher); |
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| 63 | int do_encrypt_des(const char *keyfile, const char *in, int len, FILE *out); |
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| 64 | int do_encrypt_aes(const char *keyfile, const char *in, int len, FILE *out); |
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[8bd190d] | 65 | |
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[e832a52] | 66 | int do_decrypt(const char *keyfile, int cipher); |
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| 67 | int do_decrypt_aes(const char *keyfile); |
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| 68 | int do_decrypt_des(const char *keyfile); |
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[8bd190d] | 69 | |
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[edae037] | 70 | |
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| 71 | #define M_NONE 0 |
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| 72 | #define M_ZEPHYR_ENCRYPT 1 |
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| 73 | #define M_DECRYPT 2 |
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| 74 | #define M_ENCRYPT 3 |
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| 75 | #define M_RANDOMIZE 4 |
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| 76 | #define M_SETKEY 5 |
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| 77 | |
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[6d7f2a8] | 78 | enum cipher_algo { |
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| 79 | CIPHER_DES, |
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| 80 | CIPHER_AES, |
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| 81 | NCIPHER |
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| 82 | }; |
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| 83 | |
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| 84 | typedef struct { |
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[e832a52] | 85 | int (*encrypt)(const char *keyfile, const char *in, int len, FILE *out); |
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| 86 | int (*decrypt)(const char *keyfile); |
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[6d7f2a8] | 87 | } cipher_pair; |
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| 88 | |
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| 89 | cipher_pair ciphers[NCIPHER] = { |
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[3c2c7fc] | 90 | [CIPHER_DES] = { do_encrypt_des, do_decrypt_des}, |
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| 91 | [CIPHER_AES] = { do_encrypt_aes, do_decrypt_aes}, |
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[6d7f2a8] | 92 | }; |
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[9a4077c] | 93 | |
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[c836519] | 94 | static void owl_zcrypt_string_to_schedule(char *keystring, des_key_schedule *schedule) { |
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[356465e] | 95 | #ifdef HAVE_KERBEROS_IV |
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| 96 | des_cblock key; |
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| 97 | #else |
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| 98 | des_cblock _key, *key = &_key; |
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| 99 | #endif |
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| 100 | |
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| 101 | des_string_to_key(keystring, key); |
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[c836519] | 102 | des_key_sched(key, *schedule); |
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[356465e] | 103 | } |
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| 104 | |
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| 105 | int main(int argc, char *argv[]) |
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[edae037] | 106 | { |
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[9a4077c] | 107 | char *cryptspec = NULL; |
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[e832a52] | 108 | const char *keyfile; |
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[9a4077c] | 109 | int cipher; |
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[edae037] | 110 | int error = FALSE; |
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| 111 | int zephyr = FALSE; |
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| 112 | char *class = NULL, *instance = NULL; |
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| 113 | int mode = M_NONE; |
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| 114 | |
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| 115 | char c; |
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| 116 | |
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| 117 | int messageflag = FALSE; |
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| 118 | ZWRITEOPTIONS zoptions; |
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| 119 | zoptions.flags = 0; |
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| 120 | |
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| 121 | while ((c = getopt(argc, argv, "ZDERSF:c:i:advqtluons:f:m")) != (char)EOF) |
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| 122 | { |
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| 123 | switch(c) |
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| 124 | { |
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| 125 | case 'Z': |
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| 126 | /* Zephyr encrypt */ |
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| 127 | mode = M_ZEPHYR_ENCRYPT; |
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[f7f35c0] | 128 | break; |
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[edae037] | 129 | case 'D': |
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| 130 | /* Decrypt */ |
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[f7f35c0] | 131 | mode = M_DECRYPT; |
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| 132 | break; |
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[edae037] | 133 | case 'E': |
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[f7f35c0] | 134 | /* Encrypt */ |
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| 135 | mode = M_ENCRYPT; |
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| 136 | break; |
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[edae037] | 137 | case 'R': |
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[f7f35c0] | 138 | /* Randomize the keyfile */ |
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| 139 | mode = M_RANDOMIZE; |
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| 140 | break; |
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[edae037] | 141 | case 'S': |
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[f7f35c0] | 142 | /* Set a new key value from stdin */ |
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| 143 | mode = M_SETKEY; |
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| 144 | break; |
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[edae037] | 145 | case 'F': |
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[f7f35c0] | 146 | /* Specify the keyfile explicitly */ |
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[9a4077c] | 147 | if (cryptspec != NULL) error = TRUE; |
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| 148 | cryptspec = optarg; |
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[f7f35c0] | 149 | break; |
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[edae037] | 150 | case 'c': |
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[f7f35c0] | 151 | /* Zwrite/zcrypt: class name */ |
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| 152 | if (class != NULL) error = TRUE; |
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| 153 | class = optarg; |
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| 154 | break; |
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[edae037] | 155 | case 'i': |
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[f7f35c0] | 156 | /* Zwrite/zcrypt: instance name */ |
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| 157 | if (instance != NULL) error = TRUE; |
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| 158 | instance = optarg; |
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| 159 | break; |
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[edae037] | 160 | case 'a': |
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[f7f35c0] | 161 | /* Zwrite: authenticate (default) */ |
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| 162 | zoptions.flags &= ~ZWRITE_OPT_NOAUTH; |
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| 163 | break; |
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[edae037] | 164 | case 'd': |
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[f7f35c0] | 165 | /* Zwrite: do not authenticate */ |
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| 166 | zoptions.flags |= ZWRITE_OPT_NOAUTH; |
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| 167 | break; |
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[edae037] | 168 | case 'v': |
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[f7f35c0] | 169 | /* Zwrite: verbose */ |
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| 170 | zoptions.flags |= ZWRITE_OPT_VERBOSE; |
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| 171 | break; |
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[edae037] | 172 | case 'q': |
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[f7f35c0] | 173 | /* Zwrite: quiet */ |
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| 174 | zoptions.flags |= ZWRITE_OPT_QUIET; |
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| 175 | break; |
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[edae037] | 176 | case 't': |
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[f7f35c0] | 177 | /* Zwrite: no expand tabs (ignored) */ |
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| 178 | break; |
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[edae037] | 179 | case 'l': |
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[f7f35c0] | 180 | /* Zwrite: ignore '.' on a line by itself (ignored) */ |
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| 181 | zoptions.flags |= ZCRYPT_OPT_IGNOREDOT; |
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| 182 | break; |
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[edae037] | 183 | case 'u': |
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[f7f35c0] | 184 | /* Zwrite: urgent message */ |
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| 185 | instance = "URGENT"; |
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| 186 | break; |
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[edae037] | 187 | case 'o': |
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[f7f35c0] | 188 | /* Zwrite: ignore zephyr variables zwrite-class, zwrite-inst, */ |
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| 189 | /* zwrite-opcode */ |
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| 190 | zoptions.flags |= ZWRITE_OPT_IGNOREVARS; |
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| 191 | break; |
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[edae037] | 192 | case 'n': |
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[f7f35c0] | 193 | /* Zwrite: prevent PING message (always used) */ |
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| 194 | break; |
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[edae037] | 195 | case 's': |
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[f7f35c0] | 196 | /* Zwrite: signature */ |
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| 197 | zoptions.flags |= ZWRITE_OPT_SIGNATURE; |
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| 198 | zoptions.signature = optarg; |
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| 199 | break; |
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[edae037] | 200 | case 'f': |
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[f7f35c0] | 201 | /* Zwrite: file system specification (ignored) */ |
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| 202 | break; |
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[edae037] | 203 | case 'm': |
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[f7f35c0] | 204 | /* Message on rest of line*/ |
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| 205 | messageflag = TRUE; |
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| 206 | break; |
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[edae037] | 207 | case '?': |
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[f7f35c0] | 208 | error = TRUE; |
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| 209 | break; |
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[edae037] | 210 | } |
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| 211 | if (error || messageflag) |
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| 212 | break; |
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| 213 | } |
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| 214 | |
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| 215 | if (class != NULL || instance != NULL) |
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| 216 | zephyr = TRUE; |
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| 217 | |
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| 218 | if (messageflag) |
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| 219 | { |
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| 220 | zoptions.flags |= ZCRYPT_OPT_MESSAGE; |
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| 221 | zoptions.message = BuildArgString(argv, optind, argc); |
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| 222 | if (!zoptions.message) |
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| 223 | { |
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[a08bfc3] | 224 | fprintf(stderr, "Memory allocation error.\n"); |
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[edae037] | 225 | error = TRUE; |
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| 226 | } |
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| 227 | } |
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| 228 | else if (optind < argc) |
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| 229 | { |
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| 230 | error = TRUE; |
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| 231 | } |
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| 232 | |
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| 233 | if (mode == M_NONE) |
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| 234 | mode = (zephyr?M_ZEPHYR_ENCRYPT:M_ENCRYPT); |
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| 235 | |
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| 236 | if (mode == M_ZEPHYR_ENCRYPT && !zephyr) |
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| 237 | error = TRUE; |
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| 238 | |
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[9a4077c] | 239 | if (!error && cryptspec == NULL && (class != NULL || instance != NULL)) { |
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| 240 | cryptspec = GetZephyrVarKeyFile(argv[0], class, instance); |
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| 241 | if(!cryptspec) { |
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| 242 | fprintf(stderr, "Unable to find keyfile for "); |
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| 243 | if(class != NULL) { |
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| 244 | fprintf(stderr, "-c %s ", class); |
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| 245 | } |
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| 246 | if(instance != NULL) { |
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| 247 | fprintf(stderr, "-i %s ", instance); |
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| 248 | } |
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| 249 | fprintf(stderr, "\n"); |
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| 250 | exit(-1); |
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| 251 | } |
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| 252 | } |
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| 253 | |
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[7ba7d66] | 254 | if (error || !cryptspec) |
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[edae037] | 255 | { |
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[a08bfc3] | 256 | fprintf(stderr, "Usage: %s [-Z|-D|-E|-R|-S] [-F Keyfile] [-c class] [-i instance]\n", argv[0]); |
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| 257 | fprintf(stderr, " [-advqtluon] [-s signature] [-f arg] [-m message]\n"); |
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| 258 | fprintf(stderr, " One or more of class, instance, and keyfile must be specified.\n"); |
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[4133e34] | 259 | exit(1); |
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| 260 | } |
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[9a4077c] | 261 | |
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| 262 | cipher = ParseCryptSpec(cryptspec, &keyfile); |
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| 263 | if(cipher < 0) { |
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| 264 | fprintf(stderr, "Invalid cipher specification: %s\n", cryptspec); |
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[4133e34] | 265 | exit(1); |
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[edae037] | 266 | } |
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[9a4077c] | 267 | |
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| 268 | |
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| 269 | if (mode == M_RANDOMIZE) |
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[edae037] | 270 | { |
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[9a4077c] | 271 | /* Choose a new, random key */ |
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| 272 | /* |
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[edae037] | 273 | FILE *fkey = fopen(fname, "w"); |
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| 274 | if (!fkey) |
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[9a4077c] | 275 | printf("Could not open key file for writing: %s\n", fname); |
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[edae037] | 276 | else |
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| 277 | { |
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[9a4077c] | 278 | char string[100]; |
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| 279 | fputs(fkey, string); |
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| 280 | fclose(fkey); |
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[356465e] | 281 | } |
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[9a4077c] | 282 | */ |
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| 283 | fprintf(stderr, "Feature not yet implemented.\n"); |
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| 284 | } |
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| 285 | else if (mode == M_SETKEY) |
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| 286 | { |
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| 287 | /* Set a new, user-entered key */ |
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| 288 | char newkey[MAX_KEY]; |
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| 289 | FILE *fkey; |
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[edae037] | 290 | |
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[9a4077c] | 291 | if (isatty(0)) |
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| 292 | { |
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| 293 | printf("Enter new key: "); |
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| 294 | /* Really should read without echo!!! */ |
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| 295 | } |
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| 296 | if(!fgets(newkey, MAX_KEY - 1, stdin)) { |
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| 297 | fprintf(stderr, "Error reading key.\n"); |
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| 298 | return 1; |
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[edae037] | 299 | } |
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[9a4077c] | 300 | |
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| 301 | fkey = fopen(keyfile, "w"); |
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| 302 | if (!fkey) |
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| 303 | fprintf(stderr, "Could not open key file for writing: %s\n", keyfile); |
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[edae037] | 304 | else |
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| 305 | { |
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[9a4077c] | 306 | if (fputs(newkey, fkey) != strlen(newkey) || putc('\n', fkey) != '\n') |
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| 307 | { |
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| 308 | fprintf(stderr, "Error writing to key file.\n"); |
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| 309 | fclose(fkey); |
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[4133e34] | 310 | exit(1); |
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| 311 | } |
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[edae037] | 312 | else |
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| 313 | { |
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[f7f35c0] | 314 | fclose(fkey); |
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[9a4077c] | 315 | fprintf(stderr, "Key update complete.\n"); |
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[edae037] | 316 | } |
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| 317 | } |
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| 318 | } |
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[9a4077c] | 319 | else |
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| 320 | { |
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| 321 | if (mode == M_ZEPHYR_ENCRYPT || mode == M_ENCRYPT) |
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[8bd190d] | 322 | error = !do_encrypt((mode == M_ZEPHYR_ENCRYPT), class, instance, |
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| 323 | &zoptions, keyfile, cipher); |
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[9a4077c] | 324 | else |
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[8bd190d] | 325 | error = !do_decrypt(keyfile, cipher); |
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[9a4077c] | 326 | } |
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[edae037] | 327 | |
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| 328 | /* Always print the **END** message if -D is specified. */ |
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| 329 | if (mode == M_DECRYPT) |
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| 330 | printf("**END**\n"); |
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[8bd190d] | 331 | |
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| 332 | return error; |
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[edae037] | 333 | } |
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| 334 | |
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[e832a52] | 335 | int ParseCryptSpec(const char *spec, const char **keyfile) { |
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[8bd190d] | 336 | int cipher = CIPHER_DES; |
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| 337 | char *cipher_name = strdup(spec); |
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| 338 | char *colon = strchr(cipher_name, ':'); |
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| 339 | |
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[9a4077c] | 340 | *keyfile = spec; |
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[8bd190d] | 341 | |
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| 342 | if (colon) { |
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| 343 | char *rest = strchr(spec, ':') + 1; |
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| 344 | while(isspace(*rest)) rest++; |
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| 345 | |
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| 346 | *colon-- = '\0'; |
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| 347 | while (colon >= cipher_name && isspace(*colon)) { |
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| 348 | *colon = '\0'; |
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| 349 | } |
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| 350 | |
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| 351 | if(strcmp(cipher_name, "AES") == 0) { |
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| 352 | cipher = CIPHER_AES; |
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| 353 | *keyfile = rest; |
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| 354 | } else if(strcmp(cipher_name, "DES") == 0) { |
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| 355 | cipher = CIPHER_DES; |
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| 356 | *keyfile = rest; |
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| 357 | } |
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| 358 | } |
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| 359 | |
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| 360 | free(cipher_name); |
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| 361 | |
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| 362 | return cipher; |
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[9a4077c] | 363 | } |
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| 364 | |
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[edae037] | 365 | /* Build a space-separated string from argv from elements between start * |
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| 366 | * and end - 1. malloc()'s the returned string. */ |
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| 367 | char *BuildArgString(char **argv, int start, int end) |
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| 368 | { |
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| 369 | int len = 1; |
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| 370 | int i; |
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| 371 | char *result; |
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| 372 | |
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| 373 | /* Compute the length of the string. (Plus 1 or 2) */ |
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| 374 | for (i = start; i < end; i++) |
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| 375 | len += strlen(argv[i]) + 1; |
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| 376 | |
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| 377 | /* Allocate memory */ |
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| 378 | result = (char *)malloc(len); |
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| 379 | if (result) |
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| 380 | { |
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| 381 | /* Build the string */ |
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| 382 | char *ptr = result; |
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| 383 | /* Start with an empty string, in case nothing is copied. */ |
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| 384 | *ptr = '\0'; |
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| 385 | /* Copy the arguments */ |
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| 386 | for (i = start; i < end; i++) |
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| 387 | { |
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| 388 | char *temp = argv[i]; |
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| 389 | /* Add a space, if not the first argument */ |
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| 390 | if (i != start) |
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[f7f35c0] | 391 | *ptr++ = ' '; |
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[edae037] | 392 | /* Copy argv[i], leaving ptr pointing to the '\0' copied from temp */ |
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[356465e] | 393 | while ((*ptr = *temp++)) |
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[f7f35c0] | 394 | ptr++; |
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[edae037] | 395 | } |
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| 396 | } |
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| 397 | |
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| 398 | return result; |
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| 399 | } |
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| 400 | |
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| 401 | #define MAX_BUFF 258 |
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| 402 | #define MAX_SEARCH 3 |
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| 403 | /* Find the class/instance in the .crypt-table */ |
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[e832a52] | 404 | char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance) |
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[edae037] | 405 | { |
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[356465e] | 406 | char *keyfile = NULL; |
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[6b1c3b6] | 407 | char *varname[MAX_SEARCH]; |
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[edae037] | 408 | int length[MAX_SEARCH], i; |
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| 409 | char buffer[MAX_BUFF]; |
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[6b1c3b6] | 410 | char *filename; |
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[edae037] | 411 | char result[MAX_SEARCH][MAX_BUFF]; |
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| 412 | int numsearch = 0; |
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| 413 | FILE *fsearch; |
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| 414 | |
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[6b1c3b6] | 415 | memset(varname, 0, sizeof(varname)); |
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| 416 | |
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[edae037] | 417 | /* Determine names to look for in .crypt-table */ |
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| 418 | if (instance) |
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[6b1c3b6] | 419 | varname[numsearch++] = g_strdup_printf("crypt-%s-%s:", (class?class:"message"), instance); |
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[edae037] | 420 | if (class) |
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[6b1c3b6] | 421 | varname[numsearch++] = g_strdup_printf("crypt-%s:", class); |
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| 422 | varname[numsearch++] = g_strdup("crypt-default:"); |
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[edae037] | 423 | |
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| 424 | /* Setup the result array, and determine string lengths */ |
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| 425 | for (i = 0; i < numsearch; i++) |
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| 426 | { |
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| 427 | result[i][0] = '\0'; |
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| 428 | length[i] = strlen(varname[i]); |
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| 429 | } |
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| 430 | |
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| 431 | /* Open~/.crypt-table */ |
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[6b1c3b6] | 432 | filename = g_strdup_printf("%s/.crypt-table", getenv("HOME")); |
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[edae037] | 433 | fsearch = fopen(filename, "r"); |
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| 434 | if (fsearch) |
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| 435 | { |
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| 436 | /* Scan file for a match */ |
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| 437 | while (!feof(fsearch)) |
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| 438 | { |
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[356465e] | 439 | if (!fgets(buffer, MAX_BUFF - 3, fsearch)) break; |
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[edae037] | 440 | for (i = 0; i < numsearch; i++) |
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[f7f35c0] | 441 | if (strncasecmp(varname[i], buffer, length[i]) == 0) |
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| 442 | { |
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| 443 | int j; |
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| 444 | for (j = length[i]; buffer[j] == ' '; j++) |
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| 445 | ; |
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| 446 | strcpy(result[i], &buffer[j]); |
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| 447 | if (*result[i]) |
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| 448 | if (result[i][strlen(result[i])-1] == '\n') |
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| 449 | result[i][strlen(result[i])-1] = '\0'; |
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| 450 | } |
---|
[edae037] | 451 | } |
---|
| 452 | |
---|
| 453 | /* Pick the "best" match found */ |
---|
| 454 | keyfile = NULL; |
---|
| 455 | for (i = 0; i < numsearch; i++) |
---|
| 456 | if (*result[i]) |
---|
| 457 | { |
---|
[f7f35c0] | 458 | keyfile = result[i]; |
---|
| 459 | break; |
---|
[edae037] | 460 | } |
---|
| 461 | |
---|
[9a4077c] | 462 | if (keyfile != NULL) |
---|
[edae037] | 463 | { |
---|
| 464 | /* Prepare result to be returned */ |
---|
| 465 | char *temp = keyfile; |
---|
| 466 | keyfile = (char *)malloc(strlen(temp) + 1); |
---|
| 467 | if (keyfile) |
---|
[f7f35c0] | 468 | strcpy(keyfile, temp); |
---|
[edae037] | 469 | else |
---|
[f7f35c0] | 470 | fprintf(stderr, "Memory allocation error.\n"); |
---|
[edae037] | 471 | } |
---|
| 472 | fclose(fsearch); |
---|
| 473 | } |
---|
| 474 | else |
---|
[a08bfc3] | 475 | fprintf(stderr, "Could not open key table file: %s\n", filename); |
---|
[edae037] | 476 | |
---|
[6b1c3b6] | 477 | for(i = 0; i < MAX_SEARCH; i++) { |
---|
| 478 | if(varname[i] != NULL) { |
---|
| 479 | g_free(varname[i]); |
---|
| 480 | } |
---|
| 481 | } |
---|
| 482 | |
---|
| 483 | if(filename != NULL) { |
---|
| 484 | g_free(filename); |
---|
| 485 | } |
---|
| 486 | |
---|
[edae037] | 487 | return keyfile; |
---|
| 488 | } |
---|
| 489 | |
---|
| 490 | static pid_t zephyrpipe_pid = 0; |
---|
| 491 | |
---|
| 492 | /* Open a pipe to zwrite */ |
---|
[e832a52] | 493 | FILE *GetZephyrPipe(const char *class, const char *instance, const ZWRITEOPTIONS *zoptions) |
---|
[edae037] | 494 | { |
---|
| 495 | int fildes[2]; |
---|
| 496 | pid_t pid; |
---|
| 497 | FILE *result; |
---|
[e832a52] | 498 | const char *argv[20]; |
---|
[356465e] | 499 | int argc = 0; |
---|
[edae037] | 500 | |
---|
| 501 | if (pipe(fildes) < 0) |
---|
| 502 | return NULL; |
---|
| 503 | pid = fork(); |
---|
| 504 | |
---|
| 505 | if (pid < 0) |
---|
| 506 | { |
---|
| 507 | /* Error: clean up */ |
---|
| 508 | close(fildes[0]); |
---|
| 509 | close(fildes[1]); |
---|
| 510 | result = NULL; |
---|
| 511 | } |
---|
| 512 | else if (pid == 0) |
---|
| 513 | { |
---|
| 514 | /* Setup child process */ |
---|
| 515 | argv[argc++] = "zwrite"; |
---|
| 516 | argv[argc++] = "-n"; /* Always send without ping */ |
---|
| 517 | if (class) |
---|
| 518 | { |
---|
| 519 | argv[argc++] = "-c"; |
---|
| 520 | argv[argc++] = class; |
---|
| 521 | } |
---|
| 522 | if (instance) |
---|
| 523 | { |
---|
| 524 | argv[argc++] = "-i"; |
---|
| 525 | argv[argc++] = instance; |
---|
| 526 | } |
---|
| 527 | if (zoptions->flags & ZWRITE_OPT_NOAUTH) |
---|
| 528 | argv[argc++] = "-d"; |
---|
| 529 | if (zoptions->flags & ZWRITE_OPT_QUIET) |
---|
| 530 | argv[argc++] = "-q"; |
---|
| 531 | if (zoptions->flags & ZWRITE_OPT_VERBOSE) |
---|
| 532 | argv[argc++] = "-v"; |
---|
| 533 | if (zoptions->flags & ZWRITE_OPT_SIGNATURE) |
---|
| 534 | { |
---|
| 535 | argv[argc++] = "-s"; |
---|
| 536 | argv[argc++] = zoptions->signature; |
---|
| 537 | } |
---|
| 538 | argv[argc++] = "-O"; |
---|
| 539 | argv[argc++] = "crypt"; |
---|
| 540 | argv[argc] = NULL; |
---|
| 541 | close(fildes[1]); |
---|
| 542 | if (fildes[0] != STDIN_FILENO) |
---|
| 543 | { |
---|
| 544 | if (dup2(fildes[0], STDIN_FILENO) != STDIN_FILENO) |
---|
[f7f35c0] | 545 | exit(0); |
---|
[edae037] | 546 | close(fildes[0]); |
---|
| 547 | } |
---|
| 548 | close(fildes[0]); |
---|
[e832a52] | 549 | execvp(argv[0], (char **)argv); |
---|
[a08bfc3] | 550 | fprintf(stderr, "Exec error: could not run zwrite\n"); |
---|
[edae037] | 551 | exit(0); |
---|
| 552 | } |
---|
| 553 | else |
---|
| 554 | { |
---|
| 555 | close(fildes[0]); |
---|
| 556 | /* Create a FILE * for the zwrite pipe */ |
---|
| 557 | result = (FILE *)fdopen(fildes[1], "w"); |
---|
| 558 | zephyrpipe_pid = pid; |
---|
| 559 | } |
---|
| 560 | |
---|
| 561 | return result; |
---|
| 562 | } |
---|
| 563 | |
---|
| 564 | /* Close the pipe to zwrite */ |
---|
[356465e] | 565 | void CloseZephyrPipe(FILE *pipe) |
---|
[edae037] | 566 | { |
---|
| 567 | fclose(pipe); |
---|
| 568 | waitpid(zephyrpipe_pid, NULL, 0); |
---|
| 569 | zephyrpipe_pid = 0; |
---|
| 570 | } |
---|
| 571 | |
---|
| 572 | #define BASE_CODE 70 |
---|
| 573 | #define LAST_CODE (BASE_CODE + 15) |
---|
| 574 | #define OUTPUT_BLOCK_SIZE 16 |
---|
| 575 | |
---|
[356465e] | 576 | void block_to_ascii(unsigned char *output, FILE *outfile) |
---|
[edae037] | 577 | { |
---|
| 578 | int i; |
---|
| 579 | for (i = 0; i < 8; i++) |
---|
| 580 | { |
---|
| 581 | putc(((output[i] & 0xf0) >> 4) + BASE_CODE, outfile); |
---|
| 582 | putc( (output[i] & 0x0f) + BASE_CODE, outfile); |
---|
| 583 | } |
---|
| 584 | } |
---|
| 585 | |
---|
[8bd190d] | 586 | char *slurp_stdin(int ignoredot, int *length) { |
---|
[9a4077c] | 587 | char *buf; |
---|
| 588 | char *inptr; |
---|
[edae037] | 589 | |
---|
[8bd190d] | 590 | if ((inptr = buf = (char *)malloc(MAX_RESULT)) == NULL) |
---|
| 591 | { |
---|
| 592 | fprintf(stderr, "Memory allocation error\n"); |
---|
| 593 | return NULL; |
---|
| 594 | } |
---|
| 595 | while (inptr - buf < MAX_RESULT - MAX_LINE - 20) |
---|
| 596 | { |
---|
| 597 | if (fgets(inptr, MAX_LINE, stdin) == NULL) |
---|
| 598 | break; |
---|
| 599 | |
---|
| 600 | if (inptr[0]) |
---|
| 601 | { |
---|
| 602 | if (inptr[0] == '.' && inptr[1] == '\n' && !ignoredot) |
---|
| 603 | { |
---|
| 604 | inptr[0] = '\0'; |
---|
| 605 | break; |
---|
| 606 | } |
---|
| 607 | else |
---|
| 608 | inptr += strlen(inptr); |
---|
| 609 | } |
---|
| 610 | else |
---|
| 611 | break; |
---|
| 612 | } |
---|
| 613 | *length = inptr - buf; |
---|
| 614 | |
---|
| 615 | return buf; |
---|
| 616 | } |
---|
| 617 | |
---|
| 618 | char *GetInputBuffer(ZWRITEOPTIONS *zoptions, int *length) { |
---|
| 619 | char *buf; |
---|
| 620 | |
---|
[9a4077c] | 621 | if (zoptions->flags & ZCRYPT_OPT_MESSAGE) |
---|
[edae037] | 622 | { |
---|
[9a4077c] | 623 | /* Use the -m message */ |
---|
| 624 | buf = strdup(zoptions->message); |
---|
| 625 | *length = strlen(buf); |
---|
| 626 | } |
---|
| 627 | else |
---|
| 628 | { |
---|
| 629 | if (isatty(0)) { |
---|
[edae037] | 630 | /* tty input, so show the "Type your message now..." message */ |
---|
| 631 | if (zoptions->flags & ZCRYPT_OPT_IGNOREDOT) |
---|
[f7f35c0] | 632 | printf("Type your message now. End with the end-of-file character.\n"); |
---|
[edae037] | 633 | else |
---|
[f7f35c0] | 634 | printf("Type your message now. End with control-D or a dot on a line by itself.\n"); |
---|
[9a4077c] | 635 | } else { |
---|
| 636 | zoptions->flags |= ZCRYPT_OPT_IGNOREDOT; |
---|
| 637 | } |
---|
| 638 | |
---|
[8bd190d] | 639 | buf = slurp_stdin(zoptions->flags & ZCRYPT_OPT_IGNOREDOT, length); |
---|
[9a4077c] | 640 | } |
---|
| 641 | return buf; |
---|
| 642 | } |
---|
| 643 | |
---|
[e832a52] | 644 | char *read_keystring(const char *keyfile) { |
---|
[9a4077c] | 645 | char *keystring; |
---|
| 646 | FILE *fkey = fopen(keyfile, "r"); |
---|
| 647 | if(!fkey) { |
---|
| 648 | fprintf(stderr, "Unable to open keyfile %s\n", keyfile); |
---|
| 649 | return NULL; |
---|
| 650 | } |
---|
| 651 | keystring = malloc(MAX_KEY); |
---|
| 652 | if(!fgets(keystring, MAX_KEY-1, fkey)) { |
---|
| 653 | fprintf(stderr, "Unable to read from keyfile: %s\n", keyfile); |
---|
| 654 | free(keystring); |
---|
| 655 | keystring = NULL; |
---|
| 656 | } |
---|
| 657 | fclose(fkey); |
---|
| 658 | return keystring; |
---|
| 659 | } |
---|
| 660 | |
---|
| 661 | /* Encrypt stdin, with prompt if isatty, and send to stdout, or to zwrite |
---|
| 662 | if zephyr is set. */ |
---|
[e832a52] | 663 | int do_encrypt(int zephyr, const char *class, const char *instance, |
---|
| 664 | ZWRITEOPTIONS *zoptions, const char *keyfile, int cipher) |
---|
[9a4077c] | 665 | { |
---|
| 666 | FILE *outfile = stdout; |
---|
| 667 | char *inbuff = NULL; |
---|
| 668 | int buflen; |
---|
| 669 | int out = TRUE; |
---|
| 670 | |
---|
| 671 | inbuff = GetInputBuffer(zoptions, &buflen); |
---|
| 672 | |
---|
| 673 | if(!inbuff) { |
---|
| 674 | fprintf(stderr, "Error reading zcrypt input!\n"); |
---|
| 675 | return FALSE; |
---|
| 676 | } |
---|
[edae037] | 677 | |
---|
[9a4077c] | 678 | if (zephyr) { |
---|
[edae037] | 679 | outfile = GetZephyrPipe(class, instance, zoptions); |
---|
| 680 | if (!outfile) |
---|
| 681 | { |
---|
[a08bfc3] | 682 | fprintf(stderr, "Could not run zwrite\n"); |
---|
[9a4077c] | 683 | if (inbuff) |
---|
[f7f35c0] | 684 | free(inbuff); |
---|
[edae037] | 685 | return FALSE; |
---|
| 686 | } |
---|
| 687 | } |
---|
| 688 | |
---|
[6d7f2a8] | 689 | out = ciphers[cipher].encrypt(keyfile, inbuff, buflen, outfile); |
---|
[9a4077c] | 690 | |
---|
| 691 | if (zephyr) |
---|
| 692 | CloseZephyrPipe(outfile); |
---|
| 693 | |
---|
| 694 | free(inbuff); |
---|
| 695 | return out; |
---|
| 696 | } |
---|
| 697 | |
---|
[e832a52] | 698 | int do_encrypt_des(const char *keyfile, const char *in, int length, FILE *outfile) |
---|
[9a4077c] | 699 | { |
---|
| 700 | des_key_schedule schedule; |
---|
| 701 | unsigned char input[8], output[8]; |
---|
[e832a52] | 702 | const char *inptr; |
---|
[9a4077c] | 703 | int num_blocks, last_block_size; |
---|
| 704 | char *keystring; |
---|
| 705 | int size; |
---|
| 706 | |
---|
| 707 | keystring = read_keystring(keyfile); |
---|
| 708 | if(!keystring) { |
---|
| 709 | return FALSE; |
---|
| 710 | } |
---|
| 711 | |
---|
[c836519] | 712 | owl_zcrypt_string_to_schedule(keystring, &schedule); |
---|
[9a4077c] | 713 | free(keystring); |
---|
| 714 | |
---|
| 715 | inptr = in; |
---|
| 716 | num_blocks = (length + 7) / 8; |
---|
| 717 | last_block_size = ((length + 7) % 8) + 1; |
---|
[edae037] | 718 | |
---|
| 719 | /* Encrypt the input (inbuff or stdin) and send it to outfile */ |
---|
| 720 | while (TRUE) |
---|
| 721 | { |
---|
[9a4077c] | 722 | /* Get 8 bytes from buffer */ |
---|
| 723 | if (num_blocks > 1) |
---|
[edae037] | 724 | { |
---|
[9a4077c] | 725 | size = 8; |
---|
| 726 | memcpy(input, inptr, size); |
---|
| 727 | inptr += 8; |
---|
| 728 | num_blocks--; |
---|
| 729 | } |
---|
| 730 | else if (num_blocks == 1) |
---|
| 731 | { |
---|
| 732 | size = last_block_size; |
---|
| 733 | memcpy(input, inptr, size); |
---|
| 734 | num_blocks--; |
---|
[edae037] | 735 | } |
---|
| 736 | else |
---|
[9a4077c] | 737 | size = 0; |
---|
[edae037] | 738 | |
---|
| 739 | /* Check for EOF and pad the string to 8 chars, if needed */ |
---|
| 740 | if (size == 0) |
---|
[9a4077c] | 741 | break; |
---|
[edae037] | 742 | if (size < 8) |
---|
| 743 | memset(input + size, 0, 8 - size); |
---|
| 744 | |
---|
| 745 | /* Encrypt and output the block */ |
---|
[356465e] | 746 | des_ecb_encrypt(&input, &output, schedule, TRUE); |
---|
[edae037] | 747 | block_to_ascii(output, outfile); |
---|
| 748 | |
---|
| 749 | if (size < 8) |
---|
| 750 | break; |
---|
| 751 | } |
---|
| 752 | |
---|
[9a4077c] | 753 | putc('\n', outfile); |
---|
[edae037] | 754 | |
---|
[9a4077c] | 755 | return TRUE; |
---|
[edae037] | 756 | } |
---|
| 757 | |
---|
[e832a52] | 758 | int do_encrypt_aes(const char *keyfile, const char *in, int length, FILE *outfile) |
---|
[8bd190d] | 759 | { |
---|
| 760 | char *out; |
---|
| 761 | int err, status; |
---|
| 762 | const char *argv[] = { |
---|
| 763 | "gpg", |
---|
| 764 | "--symmetric", |
---|
| 765 | "--batch", |
---|
| 766 | "--quiet", |
---|
| 767 | "--no-use-agent", |
---|
| 768 | "--armor", |
---|
| 769 | "--cipher-algo", "AES", |
---|
| 770 | "--passphrase-file", keyfile, |
---|
| 771 | NULL |
---|
| 772 | }; |
---|
| 773 | err = call_filter("gpg", argv, in, &out, &status); |
---|
| 774 | if(err || status) { |
---|
| 775 | if(out) g_free(out); |
---|
| 776 | return FALSE; |
---|
| 777 | } |
---|
| 778 | fwrite(out, strlen(out), 1, outfile); |
---|
| 779 | g_free(out); |
---|
| 780 | return TRUE; |
---|
| 781 | } |
---|
| 782 | |
---|
[edae037] | 783 | /* Read a half-byte from stdin, skipping invalid characters. Returns -1 |
---|
| 784 | if at EOF or file error */ |
---|
[356465e] | 785 | int read_ascii_nybble(void) |
---|
[edae037] | 786 | { |
---|
| 787 | char c; |
---|
| 788 | |
---|
| 789 | while (TRUE) |
---|
| 790 | { |
---|
| 791 | if (fread(&c, 1, 1, stdin) == 0) |
---|
| 792 | return -1; |
---|
| 793 | else if (c >= BASE_CODE && c <= LAST_CODE) |
---|
| 794 | return c - BASE_CODE; |
---|
| 795 | } |
---|
| 796 | } |
---|
| 797 | |
---|
| 798 | /* Read both halves of the byte and return the single byte. Returns -1 |
---|
| 799 | if at EOF or file error. */ |
---|
[356465e] | 800 | int read_ascii_byte(void) |
---|
[edae037] | 801 | { |
---|
| 802 | int c1, c2; |
---|
| 803 | c1 = read_ascii_nybble(); |
---|
| 804 | if (c1 >= 0) |
---|
| 805 | { |
---|
| 806 | c2 = read_ascii_nybble(); |
---|
| 807 | if (c2 >= 0) |
---|
| 808 | { |
---|
| 809 | return c1 * 0x10 + c2; |
---|
| 810 | } |
---|
| 811 | } |
---|
| 812 | return -1; |
---|
| 813 | } |
---|
| 814 | |
---|
| 815 | /* Read an 8-byte DES block from stdin */ |
---|
[356465e] | 816 | int read_ascii_block(unsigned char *input) |
---|
[edae037] | 817 | { |
---|
| 818 | int c; |
---|
| 819 | |
---|
| 820 | int i; |
---|
| 821 | for (i = 0; i < 8; i++) |
---|
| 822 | { |
---|
| 823 | c = read_ascii_byte(); |
---|
| 824 | if (c < 0) |
---|
| 825 | return FALSE; |
---|
| 826 | |
---|
| 827 | input[i] = c; |
---|
| 828 | } |
---|
| 829 | |
---|
| 830 | return TRUE; |
---|
| 831 | } |
---|
| 832 | |
---|
| 833 | /* Decrypt stdin */ |
---|
[e832a52] | 834 | int do_decrypt(const char *keyfile, int cipher) |
---|
[edae037] | 835 | { |
---|
[6d7f2a8] | 836 | return ciphers[cipher].decrypt(keyfile); |
---|
[8bd190d] | 837 | } |
---|
| 838 | |
---|
[e832a52] | 839 | int do_decrypt_aes(const char *keyfile) { |
---|
[8bd190d] | 840 | char *in, *out; |
---|
| 841 | int length; |
---|
| 842 | const char *argv[] = { |
---|
| 843 | "gpg", |
---|
| 844 | "--decrypt", |
---|
| 845 | "--batch", |
---|
| 846 | "--no-use-agent", |
---|
| 847 | "--quiet", |
---|
| 848 | "--passphrase-file", keyfile, |
---|
| 849 | NULL |
---|
| 850 | }; |
---|
| 851 | int err, status; |
---|
| 852 | |
---|
| 853 | in = slurp_stdin(TRUE, &length); |
---|
| 854 | if(!in) return FALSE; |
---|
| 855 | |
---|
| 856 | err = call_filter("gpg", argv, in, &out, &status); |
---|
| 857 | if(err || status) { |
---|
| 858 | if(out) g_free(out); |
---|
| 859 | return FALSE; |
---|
| 860 | } |
---|
| 861 | fwrite(out, strlen(out), 1, stdout); |
---|
| 862 | g_free(out); |
---|
| 863 | |
---|
| 864 | return TRUE; |
---|
| 865 | } |
---|
| 866 | |
---|
[e832a52] | 867 | int do_decrypt_des(const char *keyfile) { |
---|
[edae037] | 868 | des_key_schedule schedule; |
---|
[356465e] | 869 | unsigned char input[8], output[8]; |
---|
[60fcd71] | 870 | char tmp[9]; |
---|
[8bd190d] | 871 | char *keystring; |
---|
[edae037] | 872 | |
---|
[60fcd71] | 873 | /* |
---|
| 874 | DES decrypts 8 bytes at a time. We copy those over into the 9-byte |
---|
| 875 | 'tmp', which has the final byte zeroed, to ensure that we always |
---|
| 876 | have a NULL-terminated string we can call printf/strlen on. |
---|
| 877 | |
---|
| 878 | We don't pass 'tmp' to des_ecb_encrypt directly, because it's |
---|
| 879 | prototyped as taking 'unsigned char[8]', and this avoids a stupid |
---|
| 880 | cast. |
---|
| 881 | |
---|
| 882 | We zero 'tmp' entirely, not just the final byte, in case there are |
---|
| 883 | no input blocks. |
---|
| 884 | */ |
---|
| 885 | memset(tmp, 0, sizeof tmp); |
---|
[edae037] | 886 | |
---|
[8bd190d] | 887 | keystring = read_keystring(keyfile); |
---|
| 888 | if(!keystring) return FALSE; |
---|
| 889 | |
---|
[c836519] | 890 | owl_zcrypt_string_to_schedule(keystring, &schedule); |
---|
[edae037] | 891 | |
---|
[8bd190d] | 892 | free(keystring); |
---|
| 893 | |
---|
[edae037] | 894 | while (read_ascii_block(input)) |
---|
| 895 | { |
---|
[356465e] | 896 | des_ecb_encrypt(&input, &output, schedule, FALSE); |
---|
[60fcd71] | 897 | memcpy(tmp, output, 8); |
---|
| 898 | printf("%s", tmp); |
---|
[edae037] | 899 | } |
---|
| 900 | |
---|
[60fcd71] | 901 | if (!tmp[0] || tmp[strlen(tmp) - 1] != '\n') |
---|
[edae037] | 902 | printf("\n"); |
---|
[9a4077c] | 903 | return TRUE; |
---|
[edae037] | 904 | } |
---|