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server: Correctly handle extensions

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If the server had an RSA host key, it provided unconditionally SHA2
signatures without consulting the client proposed list of supported host
keys.

This commit implements more fine-grained detection of the extension
to provide the client with valid signatures according to RFC 8332
Section 3.1.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 27fe60954c)
This commit is contained in:
Jakub Jelen
2019-01-07 18:49:58 +01:00
committed by Andreas Schneider
parent d028b2495d
commit 0acfd81f85
3 changed files with 25 additions and 8 deletions
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7
include/libssh/session.h
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@@ -87,10 +87,11 @@ enum ssh_pending_call_e {
#define SSH_OPT_FLAG_GSSAPI_AUTH 0x8
/* extensions flags */
/* negotiation enabled */
#define SSH_EXT_NEGOTIATION 0x01
/* server-sig-algs extension */
#define SSH_EXT_SIG_RSA_SHA256 0x01
#define SSH_EXT_SIG_RSA_SHA512 0x02
#define SSH_EXT_ALL SSH_EXT_SIG_RSA_SHA256 | SSH_EXT_SIG_RSA_SHA512
#define SSH_EXT_SIG_RSA_SHA256 0x02
#define SSH_EXT_SIG_RSA_SHA512 0x04
/* members that are common to ssh_session and ssh_bind */
struct ssh_common_struct {