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length check the hello extensions

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This commit is contained in:
John Safranek 2013-02-18 12:52:08 -08:00
parent df011b2e40
commit d9a9982bc8
2 changed files with 21 additions and 20 deletions
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1
cyassl/internal.h
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@ -462,6 +462,7 @@ enum Misc {
ALERT_SIZE = 2, /* level + description */
REQUEST_HEADER = 2, /* always use 2 bytes */
VERIFY_HEADER = 2, /* always use 2 bytes */
EXT_ID_SZ = 2, /* always use 2 bytes */
MAX_DH_SIZE = 513, /* 4096 bit plus possible leading 0 */
MAX_SUITE_SZ = 200, /* 100 suites for now! */

40
src/internal.c
View File

@ -8500,6 +8500,7 @@ int SetCipherList(Suites* s, const char* list)
return BUFFER_ERROR;
XMEMCPY(clSuites.suites, input + i, clSuites.suiteSz);
i += clSuites.suiteSz;
clSuites.hashSigAlgoSz = 0;
b = input[i++]; /* comp len */
if (i + b > totalSz)
@ -8523,46 +8524,45 @@ int SetCipherList(Suites* s, const char* list)
ssl->options.clientState = CLIENT_HELLO_COMPLETE;
*inOutIdx = i;
clSuites.hashSigAlgoSz = 0;
if ( (i - begin) < helloSz) {
if (IsAtLeastTLSv1_2(ssl)) {
/* Need to process all extensions, i.e. skip the ones we don't
* support. */
word16 totalExtSz, extId, extSz;
/* Process the hello extension. Skip unsupported. */
word16 totalExtSz;
ato16(&input[i], &totalExtSz);
i += 2;
i += LENGTH_SZ;
if (totalExtSz > helloSz + begin - i)
return INCOMPLETE_DATA;
while (totalExtSz) {
word16 extId, extSz;
ato16(&input[i], &extId);
i += 2;
i += LENGTH_SZ;
ato16(&input[i], &extSz);
i += 2;
totalExtSz -= 4 + extSz;
i += EXT_ID_SZ;
if (extSz > totalExtSz - LENGTH_SZ - EXT_ID_SZ)
return INCOMPLETE_DATA;
if (extId == HELLO_EXT_SIG_ALGO) {
ato16(&input[i], &clSuites.hashSigAlgoSz);
i += 2;
if (i + clSuites.hashSigAlgoSz > totalSz)
i += LENGTH_SZ;
if (clSuites.hashSigAlgoSz > extSz - LENGTH_SZ)
return INCOMPLETE_DATA;
if (clSuites.hashSigAlgoSz > HELLO_EXT_SIGALGO_MAX)
return BUFFER_ERROR;
XMEMCPY(clSuites.hashSigAlgo,
input+i, clSuites.hashSigAlgoSz);
XMEMCPY(clSuites.hashSigAlgo, &input[i],
min(clSuites.hashSigAlgoSz, HELLO_EXT_SIGALGO_MAX));
i += clSuites.hashSigAlgoSz;
}
else
i += extSz;
totalExtSz -= LENGTH_SZ + EXT_ID_SZ + extSz;
}
*inOutIdx = i;
}
else
*inOutIdx = begin + helloSz; /* skip extensions */
}
else {
clSuites.hashSigAlgoSz = 0;
}
ssl->options.haveSessionId = 1;
/* ProcessOld uses same resume code */