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gpg: Limit keysize for unattended key generation to useful values.

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* g10/keygen.c (gen_elg): Enforce keysize 1024 to 4096.
(gen_rsa): Enforce keysize 1024 to 4096.
(gen_dsa): Enforce keysize 768 to 3072.
--

It was possible to create 16k RSA keys in batch mode. In addition to the
silliness of such keys, they have the major drawback that under GnuPG
and Libgcrypt, with their limited amount of specially secured memory
areas, the use of such keys may lead to an "out of secure memory"
condition.
This commit is contained in:
Werner Koch 2014-06-25 20:25:28 +02:00
parent 045c979a76
commit 48d92bcc88
1 changed files with 12 additions and 2 deletions
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14
g10/keygen.c
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@ -1170,11 +1170,16 @@ gen_elg (int algo, unsigned int nbits,
assert( is_ELGAMAL(algo) );
if (nbits < 512)
if (nbits < 1024)
{
nbits = 2048;
log_info (_("keysize invalid; using %u bits\n"), nbits );
}
else if (nbits > 4096)
{
nbits = 4096;
log_info (_("keysize invalid; using %u bits\n"), nbits );
}
if ((nbits % 32))
{
@ -1281,7 +1286,7 @@ gen_dsa (unsigned int nbits, KBNODE pub_root, KBNODE sec_root, DEK *dek,
gcry_sexp_t misc_key_info;
unsigned int qbits;
if ( nbits < 512)
if (nbits < 768)
{
nbits = 2048;
log_info(_("keysize invalid; using %u bits\n"), nbits );
@ -1437,6 +1442,11 @@ gen_rsa (int algo, unsigned nbits, KBNODE pub_root, KBNODE sec_root, DEK *dek,
nbits = 2048;
log_info (_("keysize invalid; using %u bits\n"), nbits );
}
else if (nbits > 4096)
{
nbits = 4096;
log_info (_("keysize invalid; using %u bits\n"), nbits );
}
if ((nbits % 32))
{