Mercurial > hg > quicktun
annotate src/proto.nacltai.c @ 32:51c6d2fc712f V2.1.8
Fixes contributed by Daniel Dickinson <daniel@cshore.neomailbox.net>
| author | Ivo Smits <Ivo@UCIS.nl> |
|---|---|
| date | Wed, 12 Oct 2011 01:34:46 +0200 |
| parents | 6f0e6b7dc088 |
| children | bb4bbf380938 |
| rev | line source |
|---|---|
| 0 | 1 /* Copyright 2010 Ivo Smits <Ivo@UCIS.nl>. All rights reserved. |
| 2 Redistribution and use in source and binary forms, with or without modification, are | |
| 3 permitted provided that the following conditions are met: | |
| 4 | |
| 5 1. Redistributions of source code must retain the above copyright notice, this list of | |
| 6 conditions and the following disclaimer. | |
| 7 | |
| 8 2. Redistributions in binary form must reproduce the above copyright notice, this list | |
| 9 of conditions and the following disclaimer in the documentation and/or other materials | |
| 10 provided with the distribution. | |
| 11 | |
| 12 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
| 13 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 14 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR | |
| 15 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 16 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 17 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
| 18 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 19 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 20 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 21 | |
| 22 The views and conclusions contained in the software and documentation are those of the | |
| 23 authors and should not be interpreted as representing official policies, either expressed | |
| 24 or implied, of Ivo Smits.*/ | |
| 25 | |
| 26 #include "common.c" | |
|
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27 #include "crypto_box_curve25519xsalsa20poly1305.h" |
|
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28 #include "crypto_scalarmult_curve25519.h" |
| 0 | 29 #include <sys/types.h> |
| 30 #include <sys/time.h> | |
| 31 | |
| 32 #define uint64 unsigned long long //typedef unsigned long long uint64; | |
| 33 | |
| 34 struct tai { | |
| 35 uint64 x; | |
| 36 }; | |
| 37 struct taia { | |
| 38 struct tai sec; | |
| 39 unsigned long nano; /* 0...999999999 */ | |
| 40 unsigned long atto; /* 0...999999999 */ | |
| 41 }; | |
| 42 | |
| 43 struct qt_proto_data_nacltai { | |
|
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44 unsigned char cenonce[crypto_box_curve25519xsalsa20poly1305_NONCEBYTES], cdnonce[crypto_box_curve25519xsalsa20poly1305_NONCEBYTES]; |
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45 unsigned char cbefore[crypto_box_curve25519xsalsa20poly1305_BEFORENMBYTES]; |
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46 struct taia cdtaip, cdtaie; |
| 0 | 47 }; |
| 48 | |
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49 #define noncelength 16 |
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50 #define nonceoffset (crypto_box_curve25519xsalsa20poly1305_NONCEBYTES - noncelength) |
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51 /*static unsigned char cbefore[crypto_box_curve25519xsalsa20poly1305_BEFORENMBYTES]; |
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52 static unsigned char buffer1[MAX_PACKET_LEN+crypto_box_curve25519xsalsa20poly1305_ZEROBYTES], buffer2[MAX_PACKET_LEN+crypto_box_curve25519xsalsa20poly1305_ZEROBYTES]; |
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53 static const unsigned char* buffer1offset = buffer1 + crypto_box_curve25519xsalsa20poly1305_ZEROBYTES; |
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54 static const unsigned char* buffer2offset = buffer2 + crypto_box_curve25519xsalsa20poly1305_BOXZEROBYTES - noncelength;*/ |
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55 static const int overhead = crypto_box_curve25519xsalsa20poly1305_BOXZEROBYTES + noncelength; |
| 0 | 56 |
| 57 void tai_pack(char *s, struct tai *t) { | |
| 58 uint64 x; | |
| 59 x = t->x; | |
| 60 s[7] = x & 255; x >>= 8; | |
| 61 s[6] = x & 255; x >>= 8; | |
| 62 s[5] = x & 255; x >>= 8; | |
| 63 s[4] = x & 255; x >>= 8; | |
| 64 s[3] = x & 255; x >>= 8; | |
| 65 s[2] = x & 255; x >>= 8; | |
| 66 s[1] = x & 255; x >>= 8; | |
| 67 s[0] = x; | |
| 68 } | |
| 69 void tai_unpack(char *s, struct tai *t) { | |
| 70 uint64 x; | |
| 71 x = (unsigned char) s[0]; | |
| 72 x <<= 8; x += (unsigned char) s[1]; | |
| 73 x <<= 8; x += (unsigned char) s[2]; | |
| 74 x <<= 8; x += (unsigned char) s[3]; | |
| 75 x <<= 8; x += (unsigned char) s[4]; | |
| 76 x <<= 8; x += (unsigned char) s[5]; | |
| 77 x <<= 8; x += (unsigned char) s[6]; | |
| 78 x <<= 8; x += (unsigned char) s[7]; | |
| 79 t->x = x; | |
| 80 } | |
| 81 void taia_pack(char *s, struct taia *t) { | |
| 82 unsigned long x; | |
| 83 tai_pack(s,&t->sec); | |
| 84 s += 8; | |
| 85 x = t->atto; | |
| 86 s[7] = x & 255; x >>= 8; | |
| 87 s[6] = x & 255; x >>= 8; | |
| 88 s[5] = x & 255; x >>= 8; | |
| 89 s[4] = x; | |
| 90 x = t->nano; | |
| 91 s[3] = x & 255; x >>= 8; | |
| 92 s[2] = x & 255; x >>= 8; | |
| 93 s[1] = x & 255; x >>= 8; | |
| 94 s[0] = x; | |
| 95 } | |
| 96 void taia_unpack(char *s, struct taia *t) { | |
| 97 unsigned long x; | |
| 98 tai_unpack(s,&t->sec); | |
| 99 s += 8; | |
| 100 x = (unsigned char) s[4]; | |
| 101 x <<= 8; x += (unsigned char) s[5]; | |
| 102 x <<= 8; x += (unsigned char) s[6]; | |
| 103 x <<= 8; x += (unsigned char) s[7]; | |
| 104 t->atto = x; | |
| 105 x = (unsigned char) s[0]; | |
| 106 x <<= 8; x += (unsigned char) s[1]; | |
| 107 x <<= 8; x += (unsigned char) s[2]; | |
| 108 x <<= 8; x += (unsigned char) s[3]; | |
| 109 t->nano = x; | |
| 110 } | |
| 111 | |
| 112 void taia_now(struct taia *t) { | |
| 113 struct timeval now; | |
| 114 gettimeofday(&now,(struct timezone *) 0); | |
| 115 t->sec.x = 4611686018427387914ULL + (uint64) now.tv_sec; | |
| 116 t->nano = 1000 * now.tv_usec + 500; | |
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117 t->atto++; |
| 0 | 118 } |
| 119 | |
| 120 static int encode(struct qtsession* sess, char* raw, char* enc, int len) { | |
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121 if (debug) fprintf(stderr, "Encoding packet of %d bytes from %p to %p\n", len, raw, enc); |
| 0 | 122 struct qt_proto_data_nacltai* d = (struct qt_proto_data_nacltai*)sess->protocol_data; |
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123 memset(raw, 0, crypto_box_curve25519xsalsa20poly1305_ZEROBYTES); |
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124 taia_now(&d->cdtaie); |
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125 taia_pack(d->cenonce + nonceoffset, &(d->cdtaie)); |
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126 if (crypto_box_curve25519xsalsa20poly1305_afternm(enc, raw, len + crypto_box_curve25519xsalsa20poly1305_ZEROBYTES, d->cenonce, d->cbefore)) return errorexit("Encryption failed"); |
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127 memcpy((void*)(enc + crypto_box_curve25519xsalsa20poly1305_BOXZEROBYTES - noncelength), d->cenonce + nonceoffset, noncelength); |
| 0 | 128 len += overhead; |
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129 if (debug) fprintf(stderr, "Encoded packet of %d bytes from %p to %p\n", len, raw, enc); |
| 0 | 130 return len; |
| 131 } | |
| 132 | |
| 133 static int decode(struct qtsession* sess, char* enc, char* raw, int len) { | |
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134 if (debug) fprintf(stderr, "Decoding packet of %d bytes from %p to %p\n", len, enc, raw); |
| 0 | 135 struct qt_proto_data_nacltai* d = (struct qt_proto_data_nacltai*)sess->protocol_data; |
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136 struct taia cdtaic; |
| 0 | 137 int i; |
| 138 if (len < overhead) { | |
| 139 fprintf(stderr, "Short packet received: %d\n", len); | |
| 140 return 0; | |
| 141 } | |
| 142 len -= overhead; | |
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143 taia_unpack((char*)(enc + crypto_box_curve25519xsalsa20poly1305_BOXZEROBYTES - noncelength), &cdtaic); |
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144 if (cdtaic.sec.x <= d->cdtaip.sec.x && cdtaic.nano <= d->cdtaip.nano && cdtaic.atto <= d->cdtaip.atto) { |
| 0 | 145 fprintf(stderr, "Timestamp going back, ignoring packet\n"); |
| 146 return 0; | |
| 147 } | |
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148 memcpy(d->cdnonce + nonceoffset, enc + crypto_box_curve25519xsalsa20poly1305_BOXZEROBYTES - noncelength, noncelength); |
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149 memset(enc, 0, crypto_box_curve25519xsalsa20poly1305_BOXZEROBYTES); |
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150 if (i = crypto_box_curve25519xsalsa20poly1305_open_afternm(raw, enc, len + crypto_box_curve25519xsalsa20poly1305_ZEROBYTES, d->cdnonce, d->cbefore)) { |
| 0 | 151 fprintf(stderr, "Decryption failed len=%d result=%d\n", len, i); |
| 152 return 0; | |
| 153 } | |
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154 d->cdtaip = cdtaic; |
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155 if (debug) fprintf(stderr, "Decoded packet of %d bytes from %p to %p\n", len, enc, raw); |
| 0 | 156 return len; |
| 157 } | |
| 158 | |
| 159 static int init(struct qtsession* sess) { | |
| 160 struct qt_proto_data_nacltai* d = (struct qt_proto_data_nacltai*)sess->protocol_data; | |
| 161 char* envval; | |
| 162 printf("Initializing cryptography...\n"); | |
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163 unsigned char cownpublickey[crypto_box_curve25519xsalsa20poly1305_PUBLICKEYBYTES], cpublickey[crypto_box_curve25519xsalsa20poly1305_PUBLICKEYBYTES], csecretkey[crypto_box_curve25519xsalsa20poly1305_SECRETKEYBYTES]; |
| 0 | 164 if (!(envval = getconf("PUBLIC_KEY"))) return errorexit("Missing PUBLIC_KEY"); |
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165 if (strlen(envval) != 2*crypto_box_curve25519xsalsa20poly1305_PUBLICKEYBYTES) return errorexit("PUBLIC_KEY length"); |
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166 hex2bin(cpublickey, envval, crypto_box_curve25519xsalsa20poly1305_PUBLICKEYBYTES); |
| 0 | 167 if (!(envval = getconf("PRIVATE_KEY"))) return errorexit("Missing PRIVATE_KEY"); |
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168 if (strlen(envval) != 2*crypto_box_curve25519xsalsa20poly1305_PUBLICKEYBYTES) return errorexit("PRIVATE_KEY length"); |
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169 hex2bin(csecretkey, envval, crypto_box_curve25519xsalsa20poly1305_SECRETKEYBYTES); |
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170 crypto_box_curve25519xsalsa20poly1305_beforenm(d->cbefore, cpublickey, csecretkey); |
| 0 | 171 |
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172 memset(d->cenonce, 0, crypto_box_curve25519xsalsa20poly1305_NONCEBYTES); |
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173 memset(d->cdnonce, 0, crypto_box_curve25519xsalsa20poly1305_NONCEBYTES); |
| 0 | 174 |
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175 crypto_scalarmult_curve25519_base(cownpublickey, csecretkey); |
| 0 | 176 |
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177 if (envval = getconf("TIME_WINDOW")) { |
| 0 | 178 taia_now(&d->cdtaip); |
| 179 d->cdtaip.sec.x -= atol(envval); | |
| 180 } else { | |
| 4 | 181 fprintf(stderr, "Warning: TIME_WINDOW not set, risking an initial replay attack\n"); |
| 0 | 182 } |
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183 if (envval = getconf("ROLE")) { |
| 0 | 184 d->cenonce[nonceoffset-1] = atoi(envval) ? 1 : 0; |
| 185 } else { | |
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186 d->cenonce[nonceoffset-1] = memcmp(cownpublickey, cpublickey, crypto_box_curve25519xsalsa20poly1305_PUBLICKEYBYTES) > 0 ? 1 : 0; |
| 0 | 187 } |
| 188 d->cdnonce[nonceoffset-1] = d->cenonce[nonceoffset-1] ? 0 : 1; | |
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189 return 0; |
| 0 | 190 } |
| 191 | |
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192 struct qtproto qtproto_nacltai = { |
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193 1, |
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194 MAX_PACKET_LEN + crypto_box_curve25519xsalsa20poly1305_ZEROBYTES, |
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195 MAX_PACKET_LEN + crypto_box_curve25519xsalsa20poly1305_ZEROBYTES, |
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196 crypto_box_curve25519xsalsa20poly1305_ZEROBYTES, |
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197 crypto_box_curve25519xsalsa20poly1305_BOXZEROBYTES - noncelength, |
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198 encode, |
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199 decode, |
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200 init, |
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201 sizeof(struct qt_proto_data_nacltai), |
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202 }; |
| 0 | 203 |
| 204 #ifndef COMBINED_BINARY | |
| 205 int main() { | |
| 206 print_header(); | |
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207 return qtrun(&qtproto_nacltai); |
| 0 | 208 } |
| 209 #endif |