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- djm@cvs.openbsd.org 2013/06/21 05:42:32 

[dh.c]
     sprinkle in some error() to explain moduli(5) parse failures
This commit is contained in:
Damien Miller 2013-07-18 16:10:49 +10:00
parent 7f2b438ca0
commit bbeb1dac55
2 changed files with 50 additions and 27 deletions
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3
ChangeLog
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@ -20,6 +20,9 @@
[ssh_config.5]
explicitly mention that IdentitiesOnly can be used with IdentityFile
to control which keys are offered from an agent.
- djm@cvs.openbsd.org 2013/06/21 05:42:32
[dh.c]
sprinkle in some error() to explain moduli(5) parse failures
20130702
- (dtucker) [contrib/cygwin/README contrib/cygwin/ssh-host-config

74
dh.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: dh.c,v 1.49 2011/12/07 05:44:38 djm Exp $ */
/* $OpenBSD: dh.c,v 1.50 2013/06/21 05:42:32 djm Exp $ */
/*
* Copyright (c) 2000 Niels Provos. All rights reserved.
*
@ -48,6 +48,7 @@ parse_prime(int linenum, char *line, struct dhgroup *dhg)
const char *errstr = NULL;
long long n;
dhg->p = dhg-> g = NULL;
cp = line;
if ((arg = strdelim(&cp)) == NULL)
return 0;
@ -59,66 +60,85 @@ parse_prime(int linenum, char *line, struct dhgroup *dhg)
/* time */
if (cp == NULL || *arg == '\0')
goto fail;
goto truncated;
arg = strsep(&cp, " "); /* type */
if (cp == NULL || *arg == '\0')
goto fail;
goto truncated;
/* Ensure this is a safe prime */
n = strtonum(arg, 0, 5, &errstr);
if (errstr != NULL || n != MODULI_TYPE_SAFE)
if (errstr != NULL || n != MODULI_TYPE_SAFE) {
error("moduli:%d: type is not %d", linenum, MODULI_TYPE_SAFE);
goto fail;
}
arg = strsep(&cp, " "); /* tests */
if (cp == NULL || *arg == '\0')
goto fail;
goto truncated;
/* Ensure prime has been tested and is not composite */
n = strtonum(arg, 0, 0x1f, &errstr);
if (errstr != NULL ||
(n & MODULI_TESTS_COMPOSITE) || !(n & ~MODULI_TESTS_COMPOSITE))
(n & MODULI_TESTS_COMPOSITE) || !(n & ~MODULI_TESTS_COMPOSITE)) {
error("moduli:%d: invalid moduli tests flag", linenum);
goto fail;
}
arg = strsep(&cp, " "); /* tries */
if (cp == NULL || *arg == '\0')
goto fail;
goto truncated;
n = strtonum(arg, 0, 1<<30, &errstr);
if (errstr != NULL || n == 0)
if (errstr != NULL || n == 0) {
error("moduli:%d: invalid primality trial count", linenum);
goto fail;
}
strsize = strsep(&cp, " "); /* size */
if (cp == NULL || *strsize == '\0' ||
(dhg->size = (int)strtonum(strsize, 0, 64*1024, &errstr)) == 0 ||
errstr)
errstr) {
error("moduli:%d: invalid prime length", linenum);
goto fail;
}
/* The whole group is one bit larger */
dhg->size++;
gen = strsep(&cp, " "); /* gen */
if (cp == NULL || *gen == '\0')
goto fail;
goto truncated;
prime = strsep(&cp, " "); /* prime */
if (cp != NULL || *prime == '\0')
if (cp != NULL || *prime == '\0') {
truncated:
error("moduli:%d: truncated", linenum);
goto fail;
}
if ((dhg->g = BN_new()) == NULL)
fatal("parse_prime: BN_new failed");
if ((dhg->p = BN_new()) == NULL)
fatal("parse_prime: BN_new failed");
if (BN_hex2bn(&dhg->g, gen) == 0)
goto failclean;
if (BN_hex2bn(&dhg->g, gen) == 0) {
error("moduli:%d: could not parse generator value", linenum);
goto fail;
}
if (BN_hex2bn(&dhg->p, prime) == 0) {
error("moduli:%d: could not parse prime value", linenum);
goto fail;
}
if (BN_num_bits(dhg->p) != dhg->size) {
error("moduli:%d: prime has wrong size: actual %d listed %d",
linenum, BN_num_bits(dhg->p), dhg->size - 1);
goto fail;
}
if (BN_cmp(dhg->g, BN_value_one()) <= 0) {
error("moduli:%d: generator is invalid", linenum);
goto fail;
}
if (BN_hex2bn(&dhg->p, prime) == 0)
goto failclean;
return 1;
if (BN_num_bits(dhg->p) != dhg->size)
goto failclean;
if (BN_is_zero(dhg->g) || BN_is_one(dhg->g))
goto failclean;
return (1);
failclean:
BN_clear_free(dhg->g);
BN_clear_free(dhg->p);
fail:
if (dhg->g != NULL)
BN_clear_free(dhg->g);
if (dhg->p != NULL)
BN_clear_free(dhg->p);
dhg->g = dhg->p = NULL;
error("Bad prime description in line %d", linenum);
return (0);
return 0;
}
DH *