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Fix minor issues with openssh-8.7p1-evp-fips-compl-dh.patch 

- Check return values
- Use EVP API to get the size of DH

Related: rhbz#2091694

Signed-off-by: Norbert Pocs <npocs@redhat.com>
This commit is contained in:
Norbert Pocs 2023-05-16 15:50:52 +02:00
parent 587d7b215f
commit 1490ffd3e0
2 changed files with 65 additions and 27 deletions
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83
openssh-8.7p1-evp-fips-compl-dh.patch
View File

@ -1,7 +1,7 @@
diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x config.status -x configure~ -x configure.ac ../../openssh-8.7p1/dh.c ./dh.c
--- ../../openssh-8.7p1/dh.c 2023-03-01 14:26:52.504445780 +0100
+++ ./dh.c 2023-03-01 14:20:09.823193384 +0100
@@ -37,6 +37,9 @@
diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x config.status -x configure~ -x configure.ac openssh-8.7p1/dh.c openssh-8.7p1-patched/dh.c
--- openssh-8.7p1/dh.c 2023-05-16 15:38:53.461326047 +0200
+++ openssh-8.7p1-patched/dh.c 2023-05-16 15:37:14.785260359 +0200
@@ -37,6 +37,9 @@
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/fips.h>
@ -11,7 +11,7 @@ diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x
#include "dh.h"
#include "pathnames.h"
@@ -289,10 +292,15 @@
@@ -290,10 +293,15 @@
int
dh_gen_key(DH *dh, int need)
{
@ -30,7 +30,7 @@ diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x
if (need < 0 || dh_p == NULL ||
(pbits = BN_num_bits(dh_p)) <= 0 ||
@@ -300,19 +308,85 @@
@@ -301,19 +309,85 @@
return SSH_ERR_INVALID_ARGUMENT;
if (need < 256)
need = 256;
@ -125,10 +125,10 @@ diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x
}
DH *
diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x config.status -x configure~ -x configure.ac ../../openssh-8.7p1/kex.c ./kex.c
--- ../../openssh-8.7p1/kex.c 2023-03-01 14:26:52.508445832 +0100
+++ ./kex.c 2023-02-28 14:09:27.164743771 +0100
@@ -1602,3 +1602,47 @@
diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x config.status -x configure~ -x configure.ac openssh-8.7p1/kex.c openssh-8.7p1-patched/kex.c
--- openssh-8.7p1/kex.c 2023-05-16 15:38:53.465326090 +0200
+++ openssh-8.7p1-patched/kex.c 2023-05-16 15:37:14.785260359 +0200
@@ -1603,3 +1603,47 @@
return r;
}
@ -176,20 +176,21 @@ diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x
+ return r;
+}
+#endif /* WITH_OPENSSL */
diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x config.status -x configure~ -x configure.ac ../../openssh-8.7p1/kexdh.c ./kexdh.c
--- ../../openssh-8.7p1/kexdh.c 2023-03-01 14:26:52.448445050 +0100
+++ ./kexdh.c 2023-02-28 14:05:00.700902124 +0100
@@ -35,6 +35,9 @@
diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x config.status -x configure~ -x configure.ac openssh-8.7p1/kexdh.c openssh-8.7p1-patched/kexdh.c
--- openssh-8.7p1/kexdh.c 2023-05-16 15:38:53.403325420 +0200
+++ openssh-8.7p1-patched/kexdh.c 2023-05-16 15:37:34.097468928 +0200
@@ -35,6 +35,10 @@
#include "openbsd-compat/openssl-compat.h"
#include <openssl/dh.h>
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <openssl/core_names.h>
+#include <openssl/param_build.h>
#include "sshkey.h"
#include "kex.h"
@@ -83,6 +86,9 @@
@@ -83,9 +87,12 @@
kex_dh_compute_key(struct kex *kex, BIGNUM *dh_pub, struct sshbuf *out)
{
BIGNUM *shared_secret = NULL;
@ -198,31 +199,61 @@ diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x
+ EVP_PKEY_CTX *ctx = NULL;
u_char *kbuf = NULL;
size_t klen = 0;
int kout, r;
@@ -106,18 +112,39 @@
r = SSH_ERR_ALLOC_FAIL;
- int kout, r;
+ int kout, r = 0;
#ifdef DEBUG_KEXDH
fprintf(stderr, "dh_pub= ");
@@ -100,24 +107,64 @@
r = SSH_ERR_MESSAGE_INCOMPLETE;
goto out;
}
- if ((kout = DH_compute_key(kbuf, dh_pub, kex->dh)) < 0 ||
- BN_bin2bn(kbuf, kout, shared_secret) == NULL) {
- klen = DH_size(kex->dh);
+
+ DH_get0_key(kex->dh, &pub, &priv);
+ DH_get0_pqg(kex->dh, &p, &q, &g);
+ /* import key */
+ kex_create_evp_dh(&pkey, p, q, g, pub, priv);
+ r = kex_create_evp_dh(&pkey, p, q, g, pub, priv);
+ if (r != 0) {
+ error_f("Could not create EVP_PKEY for dh");
+ ERR_print_errors_fp(stderr);
+ goto out;
+ }
+ /* import peer key
+ * the parameters should be the same as with pkey
+ */
+ kex_create_evp_dh(&dh_pkey, p, q, g, dh_pub, NULL);
+ debug_f("import peer key to evp");
+ r = kex_create_evp_dh(&dh_pkey, p, q, g, dh_pub, NULL);
+ if (r != 0) {
+ error_f("Could not import peer key for dh");
+ ERR_print_errors_fp(stderr);
+ goto out;
+ }
+
+ debug_f("creating EVP_PKEY_CTX");
+ if ((ctx = EVP_PKEY_CTX_new_from_pkey(NULL, pkey, NULL)) == NULL) {
+ error_f("Could not init EVP_PKEY_CTX for dh");
+ r = SSH_ERR_ALLOC_FAIL;
+ goto out;
+ }
+ debug_f("Deriving - init context");
+ if (EVP_PKEY_derive_init(ctx) != 1 ||
+ EVP_PKEY_derive_set_peer(ctx, dh_pkey) != 1 ||
+ EVP_PKEY_derive(ctx, kbuf, &klen) != 1 ||
+ EVP_PKEY_derive(ctx, NULL, &klen) != 1) {
+ error_f("Could not get key size");
+ r = SSH_ERR_LIBCRYPTO_ERROR;
+ goto out;
+ }
+ debug_f("Deriving - buffer size is %d", (int)klen);
if ((kbuf = malloc(klen)) == NULL ||
(shared_secret = BN_new()) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
- if ((kout = DH_compute_key(kbuf, dh_pub, kex->dh)) < 0 ||
- BN_bin2bn(kbuf, kout, shared_secret) == NULL) {
+ debug_f("Deriving - using real buffer");
+ if (EVP_PKEY_derive(ctx, kbuf, &klen) != 1 ||
+ BN_bin2bn(kbuf, klen, shared_secret) == NULL) {
+ error_f("Could not derive key");
r = SSH_ERR_LIBCRYPTO_ERROR;
@ -242,9 +273,9 @@ diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x
return r;
}
diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x config.status -x configure~ -x configure.ac ../../openssh-8.7p1/kex.h ./kex.h
--- ../../openssh-8.7p1/kex.h 2023-03-01 14:26:52.508445832 +0100
+++ ./kex.h 2023-02-28 13:16:49.811047554 +0100
diff --color -ru -x regress -x autom4te.cache -x '*.o' -x '*.lo' -x Makefile -x config.status -x configure~ -x configure.ac openssh-8.7p1/kex.h openssh-8.7p1-patched/kex.h
--- openssh-8.7p1/kex.h 2023-05-16 15:38:53.465326090 +0200
+++ openssh-8.7p1-patched/kex.h 2023-05-16 15:37:14.786260370 +0200
@@ -33,6 +33,9 @@
# include <openssl/bn.h>
# include <openssl/dh.h>

9
openssh.spec
View File

@ -51,7 +51,7 @@
# Do not forget to bump pam_ssh_agent_auth release if you rewind the main package release to 1
%global openssh_ver 8.7p1
%global openssh_rel 30
%global openssh_rel 31
%global pam_ssh_agent_ver 0.10.4
%global pam_ssh_agent_rel 5
@ -770,6 +770,13 @@ test -f %{sysconfig_anaconda} && \
%endif
%changelog
* Tue May 16 2023 Norbert Pocs <npocs@redhat.com> - 8.7p1-31
- Fix minor issues with openssh-8.7p1-evp-fips-compl-dh.patch:
- Check return values
- Use EVP API to get the size of DH
- Add some log debug lines
- Related: rhbz#2091694
* Thu Apr 20 2023 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-30
- Some non-terminating processes were listening on ports.
Resolves: rhbz#2177768