[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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[6b1c3b6] | 13 | #include <glib.h> |
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[356465e] | 14 | #include <string.h> |
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| 15 | #include <stdlib.h> |
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| 16 | #include <sys/wait.h> |
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[8bd190d] | 17 | #include <ctype.h> |
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[edae037] | 18 | |
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[b094191] | 19 | #include "config.h" |
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| 20 | |
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[49bc81e] | 21 | #ifdef HAVE_KERBEROS_IV |
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| 22 | #include <kerberosIV/des.h> |
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| 23 | #else |
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| 24 | #include <openssl/des.h> |
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| 25 | #endif |
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| 26 | |
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[8bd190d] | 27 | #include "filterproc.h" |
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| 28 | |
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[6829afc] | 29 | /* Annotate functions in which the caller owns the return value and is |
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| 30 | * responsible for ensuring it is freed. */ |
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| 31 | #define CALLER_OWN G_GNUC_WARN_UNUSED_RESULT |
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| 32 | |
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[8bd190d] | 33 | #define MAX_KEY 128 |
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| 34 | #define MAX_LINE 128 |
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| 35 | #define MAX_RESULT 4096 |
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[edae037] | 36 | |
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| 37 | #ifndef TRUE |
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| 38 | #define TRUE -1 |
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| 39 | #endif |
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| 40 | #ifndef FALSE |
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| 41 | #define FALSE 0 |
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| 42 | #endif |
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| 43 | |
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| 44 | #define ZWRITE_OPT_NOAUTH (1<<0) |
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| 45 | #define ZWRITE_OPT_SIGNATURE (1<<1) |
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| 46 | #define ZWRITE_OPT_IGNOREVARS (1<<2) |
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| 47 | #define ZWRITE_OPT_VERBOSE (1<<3) |
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| 48 | #define ZWRITE_OPT_QUIET (1<<4) |
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| 49 | #define ZCRYPT_OPT_MESSAGE (1<<5) |
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| 50 | #define ZCRYPT_OPT_IGNOREDOT (1<<6) |
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| 51 | |
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| 52 | typedef struct |
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| 53 | { |
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| 54 | int flags; |
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[1dd285b] | 55 | const char *signature; |
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[edae037] | 56 | char *message; |
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| 57 | } ZWRITEOPTIONS; |
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| 58 | |
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[6829afc] | 59 | CALLER_OWN char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance); |
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[e832a52] | 60 | int ParseCryptSpec(const char *spec, const char **keyfile); |
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[6829afc] | 61 | CALLER_OWN char *BuildArgString(char **argv, int start, int end); |
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| 62 | CALLER_OWN char *read_keystring(const char *keyfile); |
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[8bd190d] | 63 | |
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[e832a52] | 64 | int do_encrypt(int zephyr, const char *class, const char *instance, |
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| 65 | ZWRITEOPTIONS *zoptions, const char* keyfile, int cipher); |
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| 66 | int do_encrypt_des(const char *keyfile, const char *in, int len, FILE *out); |
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| 67 | int do_encrypt_aes(const char *keyfile, const char *in, int len, FILE *out); |
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[8bd190d] | 68 | |
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[e832a52] | 69 | int do_decrypt(const char *keyfile, int cipher); |
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| 70 | int do_decrypt_aes(const char *keyfile); |
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| 71 | int do_decrypt_des(const char *keyfile); |
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[8bd190d] | 72 | |
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[edae037] | 73 | |
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| 74 | #define M_NONE 0 |
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| 75 | #define M_ZEPHYR_ENCRYPT 1 |
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| 76 | #define M_DECRYPT 2 |
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| 77 | #define M_ENCRYPT 3 |
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| 78 | #define M_RANDOMIZE 4 |
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| 79 | #define M_SETKEY 5 |
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| 80 | |
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[6d7f2a8] | 81 | enum cipher_algo { |
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| 82 | CIPHER_DES, |
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| 83 | CIPHER_AES, |
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| 84 | NCIPHER |
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| 85 | }; |
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| 86 | |
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| 87 | typedef struct { |
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[e832a52] | 88 | int (*encrypt)(const char *keyfile, const char *in, int len, FILE *out); |
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| 89 | int (*decrypt)(const char *keyfile); |
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[6d7f2a8] | 90 | } cipher_pair; |
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| 91 | |
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| 92 | cipher_pair ciphers[NCIPHER] = { |
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[3c2c7fc] | 93 | [CIPHER_DES] = { do_encrypt_des, do_decrypt_des}, |
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| 94 | [CIPHER_AES] = { do_encrypt_aes, do_decrypt_aes}, |
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[6d7f2a8] | 95 | }; |
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[9a4077c] | 96 | |
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[c836519] | 97 | static void owl_zcrypt_string_to_schedule(char *keystring, des_key_schedule *schedule) { |
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[356465e] | 98 | #ifdef HAVE_KERBEROS_IV |
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| 99 | des_cblock key; |
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| 100 | #else |
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| 101 | des_cblock _key, *key = &_key; |
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| 102 | #endif |
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| 103 | |
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| 104 | des_string_to_key(keystring, key); |
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[c836519] | 105 | des_key_sched(key, *schedule); |
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[356465e] | 106 | } |
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| 107 | |
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| 108 | int main(int argc, char *argv[]) |
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[edae037] | 109 | { |
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[9a4077c] | 110 | char *cryptspec = NULL; |
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[e832a52] | 111 | const char *keyfile; |
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[9a4077c] | 112 | int cipher; |
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[edae037] | 113 | int error = FALSE; |
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| 114 | int zephyr = FALSE; |
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[1dd285b] | 115 | const char *class = NULL, *instance = NULL; |
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[edae037] | 116 | int mode = M_NONE; |
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| 117 | |
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| 118 | char c; |
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| 119 | |
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| 120 | int messageflag = FALSE; |
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| 121 | ZWRITEOPTIONS zoptions; |
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| 122 | zoptions.flags = 0; |
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| 123 | |
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| 124 | while ((c = getopt(argc, argv, "ZDERSF:c:i:advqtluons:f:m")) != (char)EOF) |
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| 125 | { |
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| 126 | switch(c) |
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| 127 | { |
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| 128 | case 'Z': |
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| 129 | /* Zephyr encrypt */ |
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| 130 | mode = M_ZEPHYR_ENCRYPT; |
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[f7f35c0] | 131 | break; |
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[edae037] | 132 | case 'D': |
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| 133 | /* Decrypt */ |
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[f7f35c0] | 134 | mode = M_DECRYPT; |
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| 135 | break; |
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[edae037] | 136 | case 'E': |
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[f7f35c0] | 137 | /* Encrypt */ |
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| 138 | mode = M_ENCRYPT; |
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| 139 | break; |
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[edae037] | 140 | case 'R': |
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[f7f35c0] | 141 | /* Randomize the keyfile */ |
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| 142 | mode = M_RANDOMIZE; |
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| 143 | break; |
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[edae037] | 144 | case 'S': |
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[f7f35c0] | 145 | /* Set a new key value from stdin */ |
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| 146 | mode = M_SETKEY; |
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| 147 | break; |
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[edae037] | 148 | case 'F': |
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[f7f35c0] | 149 | /* Specify the keyfile explicitly */ |
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[9a4077c] | 150 | if (cryptspec != NULL) error = TRUE; |
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| 151 | cryptspec = optarg; |
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[f7f35c0] | 152 | break; |
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[edae037] | 153 | case 'c': |
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[f7f35c0] | 154 | /* Zwrite/zcrypt: class name */ |
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| 155 | if (class != NULL) error = TRUE; |
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| 156 | class = optarg; |
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| 157 | break; |
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[edae037] | 158 | case 'i': |
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[f7f35c0] | 159 | /* Zwrite/zcrypt: instance name */ |
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| 160 | if (instance != NULL) error = TRUE; |
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| 161 | instance = optarg; |
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| 162 | break; |
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[edae037] | 163 | case 'a': |
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[f7f35c0] | 164 | /* Zwrite: authenticate (default) */ |
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| 165 | zoptions.flags &= ~ZWRITE_OPT_NOAUTH; |
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| 166 | break; |
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[edae037] | 167 | case 'd': |
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[f7f35c0] | 168 | /* Zwrite: do not authenticate */ |
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| 169 | zoptions.flags |= ZWRITE_OPT_NOAUTH; |
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| 170 | break; |
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[edae037] | 171 | case 'v': |
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[f7f35c0] | 172 | /* Zwrite: verbose */ |
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| 173 | zoptions.flags |= ZWRITE_OPT_VERBOSE; |
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| 174 | break; |
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[edae037] | 175 | case 'q': |
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[f7f35c0] | 176 | /* Zwrite: quiet */ |
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| 177 | zoptions.flags |= ZWRITE_OPT_QUIET; |
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| 178 | break; |
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[edae037] | 179 | case 't': |
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[f7f35c0] | 180 | /* Zwrite: no expand tabs (ignored) */ |
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| 181 | break; |
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[edae037] | 182 | case 'l': |
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[f7f35c0] | 183 | /* Zwrite: ignore '.' on a line by itself (ignored) */ |
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| 184 | zoptions.flags |= ZCRYPT_OPT_IGNOREDOT; |
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| 185 | break; |
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[edae037] | 186 | case 'u': |
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[f7f35c0] | 187 | /* Zwrite: urgent message */ |
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| 188 | instance = "URGENT"; |
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| 189 | break; |
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[edae037] | 190 | case 'o': |
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[f7f35c0] | 191 | /* Zwrite: ignore zephyr variables zwrite-class, zwrite-inst, */ |
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| 192 | /* zwrite-opcode */ |
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| 193 | zoptions.flags |= ZWRITE_OPT_IGNOREVARS; |
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| 194 | break; |
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[edae037] | 195 | case 'n': |
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[f7f35c0] | 196 | /* Zwrite: prevent PING message (always used) */ |
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| 197 | break; |
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[edae037] | 198 | case 's': |
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[f7f35c0] | 199 | /* Zwrite: signature */ |
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| 200 | zoptions.flags |= ZWRITE_OPT_SIGNATURE; |
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| 201 | zoptions.signature = optarg; |
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| 202 | break; |
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[edae037] | 203 | case 'f': |
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[f7f35c0] | 204 | /* Zwrite: file system specification (ignored) */ |
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| 205 | break; |
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[edae037] | 206 | case 'm': |
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[f7f35c0] | 207 | /* Message on rest of line*/ |
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| 208 | messageflag = TRUE; |
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| 209 | break; |
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[edae037] | 210 | case '?': |
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[f7f35c0] | 211 | error = TRUE; |
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| 212 | break; |
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[edae037] | 213 | } |
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| 214 | if (error || messageflag) |
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| 215 | break; |
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| 216 | } |
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| 217 | |
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| 218 | if (class != NULL || instance != NULL) |
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| 219 | zephyr = TRUE; |
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| 220 | |
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| 221 | if (messageflag) |
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| 222 | { |
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| 223 | zoptions.flags |= ZCRYPT_OPT_MESSAGE; |
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| 224 | zoptions.message = BuildArgString(argv, optind, argc); |
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| 225 | if (!zoptions.message) |
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| 226 | { |
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[a08bfc3] | 227 | fprintf(stderr, "Memory allocation error.\n"); |
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[edae037] | 228 | error = TRUE; |
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| 229 | } |
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| 230 | } |
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| 231 | else if (optind < argc) |
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| 232 | { |
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| 233 | error = TRUE; |
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| 234 | } |
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| 235 | |
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| 236 | if (mode == M_NONE) |
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| 237 | mode = (zephyr?M_ZEPHYR_ENCRYPT:M_ENCRYPT); |
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| 238 | |
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| 239 | if (mode == M_ZEPHYR_ENCRYPT && !zephyr) |
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| 240 | error = TRUE; |
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| 241 | |
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[9a4077c] | 242 | if (!error && cryptspec == NULL && (class != NULL || instance != NULL)) { |
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| 243 | cryptspec = GetZephyrVarKeyFile(argv[0], class, instance); |
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| 244 | if(!cryptspec) { |
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| 245 | fprintf(stderr, "Unable to find keyfile for "); |
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| 246 | if(class != NULL) { |
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| 247 | fprintf(stderr, "-c %s ", class); |
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| 248 | } |
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| 249 | if(instance != NULL) { |
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| 250 | fprintf(stderr, "-i %s ", instance); |
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| 251 | } |
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| 252 | fprintf(stderr, "\n"); |
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| 253 | exit(-1); |
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| 254 | } |
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| 255 | } |
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| 256 | |
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[7ba7d66] | 257 | if (error || !cryptspec) |
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[edae037] | 258 | { |
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[a08bfc3] | 259 | fprintf(stderr, "Usage: %s [-Z|-D|-E|-R|-S] [-F Keyfile] [-c class] [-i instance]\n", argv[0]); |
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| 260 | fprintf(stderr, " [-advqtluon] [-s signature] [-f arg] [-m message]\n"); |
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| 261 | fprintf(stderr, " One or more of class, instance, and keyfile must be specified.\n"); |
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[4133e34] | 262 | exit(1); |
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| 263 | } |
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[9a4077c] | 264 | |
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| 265 | cipher = ParseCryptSpec(cryptspec, &keyfile); |
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| 266 | if(cipher < 0) { |
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| 267 | fprintf(stderr, "Invalid cipher specification: %s\n", cryptspec); |
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[4133e34] | 268 | exit(1); |
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[edae037] | 269 | } |
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[9a4077c] | 270 | |
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| 271 | |
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| 272 | if (mode == M_RANDOMIZE) |
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[edae037] | 273 | { |
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[9a4077c] | 274 | /* Choose a new, random key */ |
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| 275 | /* |
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[edae037] | 276 | FILE *fkey = fopen(fname, "w"); |
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| 277 | if (!fkey) |
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[9a4077c] | 278 | printf("Could not open key file for writing: %s\n", fname); |
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[edae037] | 279 | else |
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| 280 | { |
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[9a4077c] | 281 | char string[100]; |
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| 282 | fputs(fkey, string); |
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| 283 | fclose(fkey); |
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[356465e] | 284 | } |
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[9a4077c] | 285 | */ |
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| 286 | fprintf(stderr, "Feature not yet implemented.\n"); |
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| 287 | } |
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| 288 | else if (mode == M_SETKEY) |
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| 289 | { |
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| 290 | /* Set a new, user-entered key */ |
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| 291 | char newkey[MAX_KEY]; |
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| 292 | FILE *fkey; |
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[edae037] | 293 | |
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[9a4077c] | 294 | if (isatty(0)) |
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| 295 | { |
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| 296 | printf("Enter new key: "); |
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| 297 | /* Really should read without echo!!! */ |
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| 298 | } |
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| 299 | if(!fgets(newkey, MAX_KEY - 1, stdin)) { |
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| 300 | fprintf(stderr, "Error reading key.\n"); |
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| 301 | return 1; |
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[edae037] | 302 | } |
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[9a4077c] | 303 | |
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| 304 | fkey = fopen(keyfile, "w"); |
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| 305 | if (!fkey) |
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| 306 | fprintf(stderr, "Could not open key file for writing: %s\n", keyfile); |
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[edae037] | 307 | else |
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| 308 | { |
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[9a4077c] | 309 | if (fputs(newkey, fkey) != strlen(newkey) || putc('\n', fkey) != '\n') |
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| 310 | { |
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| 311 | fprintf(stderr, "Error writing to key file.\n"); |
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| 312 | fclose(fkey); |
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[4133e34] | 313 | exit(1); |
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| 314 | } |
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[edae037] | 315 | else |
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| 316 | { |
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[f7f35c0] | 317 | fclose(fkey); |
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[9a4077c] | 318 | fprintf(stderr, "Key update complete.\n"); |
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[edae037] | 319 | } |
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| 320 | } |
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| 321 | } |
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[9a4077c] | 322 | else |
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| 323 | { |
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| 324 | if (mode == M_ZEPHYR_ENCRYPT || mode == M_ENCRYPT) |
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[8bd190d] | 325 | error = !do_encrypt((mode == M_ZEPHYR_ENCRYPT), class, instance, |
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| 326 | &zoptions, keyfile, cipher); |
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[9a4077c] | 327 | else |
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[8bd190d] | 328 | error = !do_decrypt(keyfile, cipher); |
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[9a4077c] | 329 | } |
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[edae037] | 330 | |
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| 331 | /* Always print the **END** message if -D is specified. */ |
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| 332 | if (mode == M_DECRYPT) |
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| 333 | printf("**END**\n"); |
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[8bd190d] | 334 | |
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| 335 | return error; |
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[edae037] | 336 | } |
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| 337 | |
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[e832a52] | 338 | int ParseCryptSpec(const char *spec, const char **keyfile) { |
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[8bd190d] | 339 | int cipher = CIPHER_DES; |
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| 340 | char *cipher_name = strdup(spec); |
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| 341 | char *colon = strchr(cipher_name, ':'); |
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| 342 | |
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[9a4077c] | 343 | *keyfile = spec; |
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[8bd190d] | 344 | |
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| 345 | if (colon) { |
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| 346 | char *rest = strchr(spec, ':') + 1; |
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| 347 | while(isspace(*rest)) rest++; |
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| 348 | |
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| 349 | *colon-- = '\0'; |
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| 350 | while (colon >= cipher_name && isspace(*colon)) { |
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| 351 | *colon = '\0'; |
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| 352 | } |
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| 353 | |
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| 354 | if(strcmp(cipher_name, "AES") == 0) { |
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| 355 | cipher = CIPHER_AES; |
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| 356 | *keyfile = rest; |
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| 357 | } else if(strcmp(cipher_name, "DES") == 0) { |
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| 358 | cipher = CIPHER_DES; |
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| 359 | *keyfile = rest; |
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| 360 | } |
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| 361 | } |
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| 362 | |
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| 363 | free(cipher_name); |
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| 364 | |
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| 365 | return cipher; |
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[9a4077c] | 366 | } |
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| 367 | |
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[edae037] | 368 | /* Build a space-separated string from argv from elements between start * |
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| 369 | * and end - 1. malloc()'s the returned string. */ |
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[6829afc] | 370 | CALLER_OWN char *BuildArgString(char **argv, int start, int end) |
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[edae037] | 371 | { |
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| 372 | int len = 1; |
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| 373 | int i; |
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| 374 | char *result; |
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| 375 | |
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| 376 | /* Compute the length of the string. (Plus 1 or 2) */ |
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| 377 | for (i = start; i < end; i++) |
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| 378 | len += strlen(argv[i]) + 1; |
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| 379 | |
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| 380 | /* Allocate memory */ |
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| 381 | result = (char *)malloc(len); |
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| 382 | if (result) |
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| 383 | { |
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| 384 | /* Build the string */ |
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| 385 | char *ptr = result; |
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| 386 | /* Start with an empty string, in case nothing is copied. */ |
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| 387 | *ptr = '\0'; |
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| 388 | /* Copy the arguments */ |
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| 389 | for (i = start; i < end; i++) |
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| 390 | { |
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| 391 | char *temp = argv[i]; |
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| 392 | /* Add a space, if not the first argument */ |
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| 393 | if (i != start) |
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[f7f35c0] | 394 | *ptr++ = ' '; |
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[edae037] | 395 | /* Copy argv[i], leaving ptr pointing to the '\0' copied from temp */ |
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[356465e] | 396 | while ((*ptr = *temp++)) |
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[f7f35c0] | 397 | ptr++; |
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[edae037] | 398 | } |
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| 399 | } |
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| 400 | |
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| 401 | return result; |
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| 402 | } |
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| 403 | |
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| 404 | #define MAX_BUFF 258 |
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| 405 | #define MAX_SEARCH 3 |
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| 406 | /* Find the class/instance in the .crypt-table */ |
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[6829afc] | 407 | CALLER_OWN char *GetZephyrVarKeyFile(const char *whoami, const char *class, const char *instance) |
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[edae037] | 408 | { |
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[356465e] | 409 | char *keyfile = NULL; |
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[6b1c3b6] | 410 | char *varname[MAX_SEARCH]; |
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[edae037] | 411 | int length[MAX_SEARCH], i; |
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| 412 | char buffer[MAX_BUFF]; |
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[6b1c3b6] | 413 | char *filename; |
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[edae037] | 414 | char result[MAX_SEARCH][MAX_BUFF]; |
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| 415 | int numsearch = 0; |
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| 416 | FILE *fsearch; |
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| 417 | |
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[6b1c3b6] | 418 | memset(varname, 0, sizeof(varname)); |
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| 419 | |
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[edae037] | 420 | /* Determine names to look for in .crypt-table */ |
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| 421 | if (instance) |
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[6b1c3b6] | 422 | varname[numsearch++] = g_strdup_printf("crypt-%s-%s:", (class?class:"message"), instance); |
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[edae037] | 423 | if (class) |
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[6b1c3b6] | 424 | varname[numsearch++] = g_strdup_printf("crypt-%s:", class); |
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| 425 | varname[numsearch++] = g_strdup("crypt-default:"); |
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[edae037] | 426 | |
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| 427 | /* Setup the result array, and determine string lengths */ |
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| 428 | for (i = 0; i < numsearch; i++) |
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| 429 | { |
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| 430 | result[i][0] = '\0'; |
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| 431 | length[i] = strlen(varname[i]); |
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| 432 | } |
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| 433 | |
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| 434 | /* Open~/.crypt-table */ |
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[dde1b4d] | 435 | filename = g_build_filename(home, ".crypt-table", NULL); |
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[edae037] | 436 | fsearch = fopen(filename, "r"); |
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| 437 | if (fsearch) |
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| 438 | { |
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| 439 | /* Scan file for a match */ |
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| 440 | while (!feof(fsearch)) |
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| 441 | { |
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[356465e] | 442 | if (!fgets(buffer, MAX_BUFF - 3, fsearch)) break; |
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[edae037] | 443 | for (i = 0; i < numsearch; i++) |
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[f7f35c0] | 444 | if (strncasecmp(varname[i], buffer, length[i]) == 0) |
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| 445 | { |
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| 446 | int j; |
---|
| 447 | for (j = length[i]; buffer[j] == ' '; j++) |
---|
| 448 | ; |
---|
| 449 | strcpy(result[i], &buffer[j]); |
---|
| 450 | if (*result[i]) |
---|
| 451 | if (result[i][strlen(result[i])-1] == '\n') |
---|
| 452 | result[i][strlen(result[i])-1] = '\0'; |
---|
| 453 | } |
---|
[edae037] | 454 | } |
---|
| 455 | |
---|
| 456 | /* Pick the "best" match found */ |
---|
| 457 | keyfile = NULL; |
---|
| 458 | for (i = 0; i < numsearch; i++) |
---|
| 459 | if (*result[i]) |
---|
| 460 | { |
---|
[f7f35c0] | 461 | keyfile = result[i]; |
---|
| 462 | break; |
---|
[edae037] | 463 | } |
---|
| 464 | |
---|
[9a4077c] | 465 | if (keyfile != NULL) |
---|
[edae037] | 466 | { |
---|
| 467 | /* Prepare result to be returned */ |
---|
| 468 | char *temp = keyfile; |
---|
| 469 | keyfile = (char *)malloc(strlen(temp) + 1); |
---|
| 470 | if (keyfile) |
---|
[f7f35c0] | 471 | strcpy(keyfile, temp); |
---|
[edae037] | 472 | else |
---|
[f7f35c0] | 473 | fprintf(stderr, "Memory allocation error.\n"); |
---|
[edae037] | 474 | } |
---|
| 475 | fclose(fsearch); |
---|
| 476 | } |
---|
| 477 | else |
---|
[a08bfc3] | 478 | fprintf(stderr, "Could not open key table file: %s\n", filename); |
---|
[edae037] | 479 | |
---|
[6b1c3b6] | 480 | for(i = 0; i < MAX_SEARCH; i++) { |
---|
[3b8a563] | 481 | g_free(varname[i]); |
---|
[6b1c3b6] | 482 | } |
---|
| 483 | |
---|
[3b8a563] | 484 | g_free(filename); |
---|
[6b1c3b6] | 485 | |
---|
[edae037] | 486 | return keyfile; |
---|
| 487 | } |
---|
| 488 | |
---|
| 489 | static pid_t zephyrpipe_pid = 0; |
---|
| 490 | |
---|
| 491 | /* Open a pipe to zwrite */ |
---|
[e832a52] | 492 | FILE *GetZephyrPipe(const char *class, const char *instance, const ZWRITEOPTIONS *zoptions) |
---|
[edae037] | 493 | { |
---|
| 494 | int fildes[2]; |
---|
| 495 | pid_t pid; |
---|
| 496 | FILE *result; |
---|
[e832a52] | 497 | const char *argv[20]; |
---|
[356465e] | 498 | int argc = 0; |
---|
[edae037] | 499 | |
---|
| 500 | if (pipe(fildes) < 0) |
---|
| 501 | return NULL; |
---|
| 502 | pid = fork(); |
---|
| 503 | |
---|
| 504 | if (pid < 0) |
---|
| 505 | { |
---|
| 506 | /* Error: clean up */ |
---|
| 507 | close(fildes[0]); |
---|
| 508 | close(fildes[1]); |
---|
| 509 | result = NULL; |
---|
| 510 | } |
---|
| 511 | else if (pid == 0) |
---|
| 512 | { |
---|
| 513 | /* Setup child process */ |
---|
| 514 | argv[argc++] = "zwrite"; |
---|
| 515 | argv[argc++] = "-n"; /* Always send without ping */ |
---|
| 516 | if (class) |
---|
| 517 | { |
---|
| 518 | argv[argc++] = "-c"; |
---|
| 519 | argv[argc++] = class; |
---|
| 520 | } |
---|
| 521 | if (instance) |
---|
| 522 | { |
---|
| 523 | argv[argc++] = "-i"; |
---|
| 524 | argv[argc++] = instance; |
---|
| 525 | } |
---|
| 526 | if (zoptions->flags & ZWRITE_OPT_NOAUTH) |
---|
| 527 | argv[argc++] = "-d"; |
---|
| 528 | if (zoptions->flags & ZWRITE_OPT_QUIET) |
---|
| 529 | argv[argc++] = "-q"; |
---|
| 530 | if (zoptions->flags & ZWRITE_OPT_VERBOSE) |
---|
| 531 | argv[argc++] = "-v"; |
---|
| 532 | if (zoptions->flags & ZWRITE_OPT_SIGNATURE) |
---|
| 533 | { |
---|
| 534 | argv[argc++] = "-s"; |
---|
| 535 | argv[argc++] = zoptions->signature; |
---|
| 536 | } |
---|
| 537 | argv[argc++] = "-O"; |
---|
| 538 | argv[argc++] = "crypt"; |
---|
| 539 | argv[argc] = NULL; |
---|
| 540 | close(fildes[1]); |
---|
| 541 | if (fildes[0] != STDIN_FILENO) |
---|
| 542 | { |
---|
| 543 | if (dup2(fildes[0], STDIN_FILENO) != STDIN_FILENO) |
---|
[f7f35c0] | 544 | exit(0); |
---|
[edae037] | 545 | close(fildes[0]); |
---|
| 546 | } |
---|
| 547 | close(fildes[0]); |
---|
[e832a52] | 548 | execvp(argv[0], (char **)argv); |
---|
[a08bfc3] | 549 | fprintf(stderr, "Exec error: could not run zwrite\n"); |
---|
[edae037] | 550 | exit(0); |
---|
| 551 | } |
---|
| 552 | else |
---|
| 553 | { |
---|
| 554 | close(fildes[0]); |
---|
| 555 | /* Create a FILE * for the zwrite pipe */ |
---|
| 556 | result = (FILE *)fdopen(fildes[1], "w"); |
---|
| 557 | zephyrpipe_pid = pid; |
---|
| 558 | } |
---|
| 559 | |
---|
| 560 | return result; |
---|
| 561 | } |
---|
| 562 | |
---|
| 563 | /* Close the pipe to zwrite */ |
---|
[356465e] | 564 | void CloseZephyrPipe(FILE *pipe) |
---|
[edae037] | 565 | { |
---|
| 566 | fclose(pipe); |
---|
| 567 | waitpid(zephyrpipe_pid, NULL, 0); |
---|
| 568 | zephyrpipe_pid = 0; |
---|
| 569 | } |
---|
| 570 | |
---|
| 571 | #define BASE_CODE 70 |
---|
| 572 | #define LAST_CODE (BASE_CODE + 15) |
---|
| 573 | #define OUTPUT_BLOCK_SIZE 16 |
---|
| 574 | |
---|
[356465e] | 575 | void block_to_ascii(unsigned char *output, FILE *outfile) |
---|
[edae037] | 576 | { |
---|
| 577 | int i; |
---|
| 578 | for (i = 0; i < 8; i++) |
---|
| 579 | { |
---|
| 580 | putc(((output[i] & 0xf0) >> 4) + BASE_CODE, outfile); |
---|
| 581 | putc( (output[i] & 0x0f) + BASE_CODE, outfile); |
---|
| 582 | } |
---|
| 583 | } |
---|
| 584 | |
---|
[6829afc] | 585 | CALLER_OWN char *slurp_stdin(int ignoredot, int *length) { |
---|
[9a4077c] | 586 | char *buf; |
---|
| 587 | char *inptr; |
---|
[edae037] | 588 | |
---|
[8bd190d] | 589 | if ((inptr = buf = (char *)malloc(MAX_RESULT)) == NULL) |
---|
| 590 | { |
---|
| 591 | fprintf(stderr, "Memory allocation error\n"); |
---|
| 592 | return NULL; |
---|
| 593 | } |
---|
| 594 | while (inptr - buf < MAX_RESULT - MAX_LINE - 20) |
---|
| 595 | { |
---|
| 596 | if (fgets(inptr, MAX_LINE, stdin) == NULL) |
---|
| 597 | break; |
---|
| 598 | |
---|
| 599 | if (inptr[0]) |
---|
| 600 | { |
---|
| 601 | if (inptr[0] == '.' && inptr[1] == '\n' && !ignoredot) |
---|
| 602 | { |
---|
| 603 | inptr[0] = '\0'; |
---|
| 604 | break; |
---|
| 605 | } |
---|
| 606 | else |
---|
| 607 | inptr += strlen(inptr); |
---|
| 608 | } |
---|
| 609 | else |
---|
| 610 | break; |
---|
| 611 | } |
---|
| 612 | *length = inptr - buf; |
---|
| 613 | |
---|
| 614 | return buf; |
---|
| 615 | } |
---|
| 616 | |
---|
[6829afc] | 617 | CALLER_OWN char *GetInputBuffer(ZWRITEOPTIONS *zoptions, int *length) { |
---|
[8bd190d] | 618 | char *buf; |
---|
| 619 | |
---|
[9a4077c] | 620 | if (zoptions->flags & ZCRYPT_OPT_MESSAGE) |
---|
[edae037] | 621 | { |
---|
[9a4077c] | 622 | /* Use the -m message */ |
---|
| 623 | buf = strdup(zoptions->message); |
---|
| 624 | *length = strlen(buf); |
---|
| 625 | } |
---|
| 626 | else |
---|
| 627 | { |
---|
| 628 | if (isatty(0)) { |
---|
[edae037] | 629 | /* tty input, so show the "Type your message now..." message */ |
---|
| 630 | if (zoptions->flags & ZCRYPT_OPT_IGNOREDOT) |
---|
[f7f35c0] | 631 | printf("Type your message now. End with the end-of-file character.\n"); |
---|
[edae037] | 632 | else |
---|
[f7f35c0] | 633 | printf("Type your message now. End with control-D or a dot on a line by itself.\n"); |
---|
[9a4077c] | 634 | } else { |
---|
| 635 | zoptions->flags |= ZCRYPT_OPT_IGNOREDOT; |
---|
| 636 | } |
---|
| 637 | |
---|
[8bd190d] | 638 | buf = slurp_stdin(zoptions->flags & ZCRYPT_OPT_IGNOREDOT, length); |
---|
[9a4077c] | 639 | } |
---|
| 640 | return buf; |
---|
| 641 | } |
---|
| 642 | |
---|
[6829afc] | 643 | CALLER_OWN char *read_keystring(const char *keyfile) { |
---|
[9a4077c] | 644 | char *keystring; |
---|
| 645 | FILE *fkey = fopen(keyfile, "r"); |
---|
| 646 | if(!fkey) { |
---|
| 647 | fprintf(stderr, "Unable to open keyfile %s\n", keyfile); |
---|
| 648 | return NULL; |
---|
| 649 | } |
---|
| 650 | keystring = malloc(MAX_KEY); |
---|
| 651 | if(!fgets(keystring, MAX_KEY-1, fkey)) { |
---|
| 652 | fprintf(stderr, "Unable to read from keyfile: %s\n", keyfile); |
---|
| 653 | free(keystring); |
---|
| 654 | keystring = NULL; |
---|
| 655 | } |
---|
| 656 | fclose(fkey); |
---|
| 657 | return keystring; |
---|
| 658 | } |
---|
| 659 | |
---|
| 660 | /* Encrypt stdin, with prompt if isatty, and send to stdout, or to zwrite |
---|
| 661 | if zephyr is set. */ |
---|
[e832a52] | 662 | int do_encrypt(int zephyr, const char *class, const char *instance, |
---|
| 663 | ZWRITEOPTIONS *zoptions, const char *keyfile, int cipher) |
---|
[9a4077c] | 664 | { |
---|
| 665 | FILE *outfile = stdout; |
---|
| 666 | char *inbuff = NULL; |
---|
| 667 | int buflen; |
---|
| 668 | int out = TRUE; |
---|
| 669 | |
---|
| 670 | inbuff = GetInputBuffer(zoptions, &buflen); |
---|
| 671 | |
---|
| 672 | if(!inbuff) { |
---|
| 673 | fprintf(stderr, "Error reading zcrypt input!\n"); |
---|
| 674 | return FALSE; |
---|
| 675 | } |
---|
[edae037] | 676 | |
---|
[9a4077c] | 677 | if (zephyr) { |
---|
[edae037] | 678 | outfile = GetZephyrPipe(class, instance, zoptions); |
---|
| 679 | if (!outfile) |
---|
| 680 | { |
---|
[a08bfc3] | 681 | fprintf(stderr, "Could not run zwrite\n"); |
---|
[9a4077c] | 682 | if (inbuff) |
---|
[f7f35c0] | 683 | free(inbuff); |
---|
[edae037] | 684 | return FALSE; |
---|
| 685 | } |
---|
| 686 | } |
---|
| 687 | |
---|
[6d7f2a8] | 688 | out = ciphers[cipher].encrypt(keyfile, inbuff, buflen, outfile); |
---|
[9a4077c] | 689 | |
---|
| 690 | if (zephyr) |
---|
| 691 | CloseZephyrPipe(outfile); |
---|
| 692 | |
---|
| 693 | free(inbuff); |
---|
| 694 | return out; |
---|
| 695 | } |
---|
| 696 | |
---|
[e832a52] | 697 | int do_encrypt_des(const char *keyfile, const char *in, int length, FILE *outfile) |
---|
[9a4077c] | 698 | { |
---|
| 699 | des_key_schedule schedule; |
---|
| 700 | unsigned char input[8], output[8]; |
---|
[e832a52] | 701 | const char *inptr; |
---|
[9a4077c] | 702 | int num_blocks, last_block_size; |
---|
| 703 | char *keystring; |
---|
| 704 | int size; |
---|
| 705 | |
---|
| 706 | keystring = read_keystring(keyfile); |
---|
| 707 | if(!keystring) { |
---|
| 708 | return FALSE; |
---|
| 709 | } |
---|
| 710 | |
---|
[c836519] | 711 | owl_zcrypt_string_to_schedule(keystring, &schedule); |
---|
[9a4077c] | 712 | free(keystring); |
---|
| 713 | |
---|
| 714 | inptr = in; |
---|
| 715 | num_blocks = (length + 7) / 8; |
---|
| 716 | last_block_size = ((length + 7) % 8) + 1; |
---|
[edae037] | 717 | |
---|
| 718 | /* Encrypt the input (inbuff or stdin) and send it to outfile */ |
---|
| 719 | while (TRUE) |
---|
| 720 | { |
---|
[9a4077c] | 721 | /* Get 8 bytes from buffer */ |
---|
| 722 | if (num_blocks > 1) |
---|
[edae037] | 723 | { |
---|
[9a4077c] | 724 | size = 8; |
---|
| 725 | memcpy(input, inptr, size); |
---|
| 726 | inptr += 8; |
---|
| 727 | num_blocks--; |
---|
| 728 | } |
---|
| 729 | else if (num_blocks == 1) |
---|
| 730 | { |
---|
| 731 | size = last_block_size; |
---|
| 732 | memcpy(input, inptr, size); |
---|
| 733 | num_blocks--; |
---|
[edae037] | 734 | } |
---|
| 735 | else |
---|
[9a4077c] | 736 | size = 0; |
---|
[edae037] | 737 | |
---|
| 738 | /* Check for EOF and pad the string to 8 chars, if needed */ |
---|
| 739 | if (size == 0) |
---|
[9a4077c] | 740 | break; |
---|
[edae037] | 741 | if (size < 8) |
---|
| 742 | memset(input + size, 0, 8 - size); |
---|
| 743 | |
---|
| 744 | /* Encrypt and output the block */ |
---|
[356465e] | 745 | des_ecb_encrypt(&input, &output, schedule, TRUE); |
---|
[edae037] | 746 | block_to_ascii(output, outfile); |
---|
| 747 | |
---|
| 748 | if (size < 8) |
---|
| 749 | break; |
---|
| 750 | } |
---|
| 751 | |
---|
[9a4077c] | 752 | putc('\n', outfile); |
---|
[edae037] | 753 | |
---|
[9a4077c] | 754 | return TRUE; |
---|
[edae037] | 755 | } |
---|
| 756 | |
---|
[e832a52] | 757 | int do_encrypt_aes(const char *keyfile, const char *in, int length, FILE *outfile) |
---|
[8bd190d] | 758 | { |
---|
| 759 | char *out; |
---|
| 760 | int err, status; |
---|
| 761 | const char *argv[] = { |
---|
| 762 | "gpg", |
---|
| 763 | "--symmetric", |
---|
| 764 | "--batch", |
---|
| 765 | "--quiet", |
---|
| 766 | "--no-use-agent", |
---|
| 767 | "--armor", |
---|
| 768 | "--cipher-algo", "AES", |
---|
| 769 | "--passphrase-file", keyfile, |
---|
| 770 | NULL |
---|
| 771 | }; |
---|
| 772 | err = call_filter("gpg", argv, in, &out, &status); |
---|
| 773 | if(err || status) { |
---|
[3b8a563] | 774 | g_free(out); |
---|
[8bd190d] | 775 | return FALSE; |
---|
| 776 | } |
---|
| 777 | fwrite(out, strlen(out), 1, outfile); |
---|
| 778 | g_free(out); |
---|
| 779 | return TRUE; |
---|
| 780 | } |
---|
| 781 | |
---|
[edae037] | 782 | /* Read a half-byte from stdin, skipping invalid characters. Returns -1 |
---|
| 783 | if at EOF or file error */ |
---|
[356465e] | 784 | int read_ascii_nybble(void) |
---|
[edae037] | 785 | { |
---|
| 786 | char c; |
---|
| 787 | |
---|
| 788 | while (TRUE) |
---|
| 789 | { |
---|
| 790 | if (fread(&c, 1, 1, stdin) == 0) |
---|
| 791 | return -1; |
---|
| 792 | else if (c >= BASE_CODE && c <= LAST_CODE) |
---|
| 793 | return c - BASE_CODE; |
---|
| 794 | } |
---|
| 795 | } |
---|
| 796 | |
---|
| 797 | /* Read both halves of the byte and return the single byte. Returns -1 |
---|
| 798 | if at EOF or file error. */ |
---|
[356465e] | 799 | int read_ascii_byte(void) |
---|
[edae037] | 800 | { |
---|
| 801 | int c1, c2; |
---|
| 802 | c1 = read_ascii_nybble(); |
---|
| 803 | if (c1 >= 0) |
---|
| 804 | { |
---|
| 805 | c2 = read_ascii_nybble(); |
---|
| 806 | if (c2 >= 0) |
---|
| 807 | { |
---|
| 808 | return c1 * 0x10 + c2; |
---|
| 809 | } |
---|
| 810 | } |
---|
| 811 | return -1; |
---|
| 812 | } |
---|
| 813 | |
---|
| 814 | /* Read an 8-byte DES block from stdin */ |
---|
[356465e] | 815 | int read_ascii_block(unsigned char *input) |
---|
[edae037] | 816 | { |
---|
| 817 | int c; |
---|
| 818 | |
---|
| 819 | int i; |
---|
| 820 | for (i = 0; i < 8; i++) |
---|
| 821 | { |
---|
| 822 | c = read_ascii_byte(); |
---|
| 823 | if (c < 0) |
---|
| 824 | return FALSE; |
---|
| 825 | |
---|
| 826 | input[i] = c; |
---|
| 827 | } |
---|
| 828 | |
---|
| 829 | return TRUE; |
---|
| 830 | } |
---|
| 831 | |
---|
| 832 | /* Decrypt stdin */ |
---|
[e832a52] | 833 | int do_decrypt(const char *keyfile, int cipher) |
---|
[edae037] | 834 | { |
---|
[6d7f2a8] | 835 | return ciphers[cipher].decrypt(keyfile); |
---|
[8bd190d] | 836 | } |
---|
| 837 | |
---|
[e832a52] | 838 | int do_decrypt_aes(const char *keyfile) { |
---|
[8bd190d] | 839 | char *in, *out; |
---|
| 840 | int length; |
---|
| 841 | const char *argv[] = { |
---|
| 842 | "gpg", |
---|
| 843 | "--decrypt", |
---|
| 844 | "--batch", |
---|
| 845 | "--no-use-agent", |
---|
| 846 | "--quiet", |
---|
| 847 | "--passphrase-file", keyfile, |
---|
| 848 | NULL |
---|
| 849 | }; |
---|
| 850 | int err, status; |
---|
| 851 | |
---|
| 852 | in = slurp_stdin(TRUE, &length); |
---|
| 853 | if(!in) return FALSE; |
---|
| 854 | |
---|
| 855 | err = call_filter("gpg", argv, in, &out, &status); |
---|
| 856 | if(err || status) { |
---|
[3b8a563] | 857 | g_free(out); |
---|
[8bd190d] | 858 | return FALSE; |
---|
| 859 | } |
---|
| 860 | fwrite(out, strlen(out), 1, stdout); |
---|
| 861 | g_free(out); |
---|
| 862 | |
---|
| 863 | return TRUE; |
---|
| 864 | } |
---|
| 865 | |
---|
[e832a52] | 866 | int do_decrypt_des(const char *keyfile) { |
---|
[edae037] | 867 | des_key_schedule schedule; |
---|
[356465e] | 868 | unsigned char input[8], output[8]; |
---|
[60fcd71] | 869 | char tmp[9]; |
---|
[8bd190d] | 870 | char *keystring; |
---|
[edae037] | 871 | |
---|
[60fcd71] | 872 | /* |
---|
| 873 | DES decrypts 8 bytes at a time. We copy those over into the 9-byte |
---|
| 874 | 'tmp', which has the final byte zeroed, to ensure that we always |
---|
| 875 | have a NULL-terminated string we can call printf/strlen on. |
---|
| 876 | |
---|
| 877 | We don't pass 'tmp' to des_ecb_encrypt directly, because it's |
---|
| 878 | prototyped as taking 'unsigned char[8]', and this avoids a stupid |
---|
| 879 | cast. |
---|
| 880 | |
---|
| 881 | We zero 'tmp' entirely, not just the final byte, in case there are |
---|
| 882 | no input blocks. |
---|
| 883 | */ |
---|
| 884 | memset(tmp, 0, sizeof tmp); |
---|
[edae037] | 885 | |
---|
[8bd190d] | 886 | keystring = read_keystring(keyfile); |
---|
| 887 | if(!keystring) return FALSE; |
---|
| 888 | |
---|
[c836519] | 889 | owl_zcrypt_string_to_schedule(keystring, &schedule); |
---|
[edae037] | 890 | |
---|
[8bd190d] | 891 | free(keystring); |
---|
| 892 | |
---|
[edae037] | 893 | while (read_ascii_block(input)) |
---|
| 894 | { |
---|
[356465e] | 895 | des_ecb_encrypt(&input, &output, schedule, FALSE); |
---|
[60fcd71] | 896 | memcpy(tmp, output, 8); |
---|
| 897 | printf("%s", tmp); |
---|
[edae037] | 898 | } |
---|
| 899 | |
---|
[60fcd71] | 900 | if (!tmp[0] || tmp[strlen(tmp) - 1] != '\n') |
---|
[edae037] | 901 | printf("\n"); |
---|
[9a4077c] | 902 | return TRUE; |
---|
[edae037] | 903 | } |
---|