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supply callback to PEM_read_bio_PrivateKey

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OpenSSL 1.1.0i has changed the behaviour of their PEM APIs,
so that empty passphrases are interpreted differently. This
probabalistically breaks loading some keys, because the PEM format
is terrible and doesn't include a proper MAC.

Avoid this by providing a basic callback to avoid passing empty
passphrases to OpenSSL in cases where one is required.

Based on patch from Jakub Jelen in bz#2913; ok dtucker@
This commit is contained in:
Damien Miller 2018-10-11 10:29:29 +11:00
parent d1d301a1dd
commit 12731158c7
1 changed files with 15 additions and 1 deletions
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16
sshkey.c
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@ -3913,6 +3913,20 @@ convert_libcrypto_error(void)
return translate_libcrypto_error(ERR_peek_last_error());
}
static int
pem_passphrase_cb(char *buf, int size, int rwflag, void *u)
{
char *p = (char *)u;
size_t len;
if (p == NULL || (len = strlen(p)) == 0)
return -1;
if (size < 0 || len > (size_t)size)
return -1;
memcpy(buf, p, len);
return (int)len;
}
static int
sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
const char *passphrase, struct sshkey **keyp)
@ -3934,7 +3948,7 @@ sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
}
clear_libcrypto_errors();
if ((pk = PEM_read_bio_PrivateKey(bio, NULL, NULL,
if ((pk = PEM_read_bio_PrivateKey(bio, NULL, pem_passphrase_cb,
(char *)passphrase)) == NULL) {
/*
* libcrypto may return various ASN.1 errors when attempting