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openssh/backport-openssh-7.7p1-fips.patch
bitianyuan d9d3952e6d backport some upstream patches 
(cherry picked from commit 2ad55f43cb143356916313e5b648c32857f76555)
2024-11-18 14:28:58 +08:00

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From 94f3898f43a7ef0c53dd50c60ce6d6f884de28e1 Mon Sep 17 00:00:00 2001
Date: Tue, 20 Aug 2024 20:17:01 +0800
Subject: [PATCH] backport-openssh-7.7p1-fips
Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.7p1-fips.patch
Conflict:NA
---
cipher-aes.c | 3 +-
dh.c | 41 +++++++++++++++++++++++++++
dh.h | 1 +
kex.c | 6 +++-
kexgexc.c | 5 ++++
myproposal.h | 33 ++++++++++++++++++++++
readconf.c | 16 +++++++----
sandbox-seccomp-filter.c | 3 ++
servconf.c | 16 +++++++----
ssh-keygen.c | 17 ++++++++++-
ssh-rsa.c | 3 ++
ssh.c | 5 ++++
sshconnect2.c | 61 ++++++++++++++++++++++------------------
sshd.c | 19 ++++++++++---
sshkey.c | 1 +
15 files changed, 186 insertions(+), 44 deletions(-)
diff --git a/cipher-aes.c b/cipher-aes.c
index 8b10172..1a07697 100644
--- a/cipher-aes.c
+++ b/cipher-aes.c
@@ -154,7 +154,8 @@ evp_rijndael(void)
rijndal_cbc.do_cipher = ssh_rijndael_cbc;
#ifndef SSH_OLD_EVP
rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
- EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV;
+ EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV |
+ EVP_CIPH_FLAG_FIPS;
#endif
return (&rijndal_cbc);
}
diff --git a/dh.c b/dh.c
index ce2eb47..166cb02 100644
--- a/dh.c
+++ b/dh.c
@@ -36,6 +36,7 @@
#include <openssl/bn.h>
#include <openssl/dh.h>
+#include <openssl/fips.h>
#include "dh.h"
#include "pathnames.h"
@@ -164,6 +165,12 @@ choose_dh(int min, int wantbits, int max)
int best, bestcount, which, linenum;
struct dhgroup dhg;
+ if (FIPS_mode()) {
+ logit("Using arbitrary primes is not allowed in FIPS mode."
+ " Falling back to known groups.");
+ return (dh_new_group_fallback(max));
+ }
+
if ((f = fopen(get_moduli_filename(), "r")) == NULL) {
logit("WARNING: could not open %s (%s), using fixed modulus",
get_moduli_filename(), strerror(errno));
@@ -502,4 +509,38 @@ dh_estimate(int bits)
return 8192;
}
+/*
+ * Compares the received DH parameters with known-good groups,
+ * which might be either from group14, group16 or group18.
+ */
+int
+dh_is_known_group(const DH *dh)
+{
+ const BIGNUM *p, *g;
+ const BIGNUM *known_p, *known_g;
+ DH *known = NULL;
+ int bits = 0, rv = 0;
+
+ DH_get0_pqg(dh, &p, NULL, &g);
+ bits = BN_num_bits(p);
+
+ if (bits <= 3072) {
+ known = dh_new_group14();
+ } else if (bits <= 6144) {
+ known = dh_new_group16();
+ } else {
+ known = dh_new_group18();
+ }
+
+ DH_get0_pqg(known, &known_p, NULL, &known_g);
+
+ if (BN_cmp(g, known_g) == 0 &&
+ BN_cmp(p, known_p) == 0) {
+ rv = 1;
+ }
+
+ DH_free(known);
+ return rv;
+}
+
#endif /* WITH_OPENSSL */
diff --git a/dh.h b/dh.h
index c6326a3..e51e292 100644
--- a/dh.h
+++ b/dh.h
@@ -45,6 +45,7 @@ DH *dh_new_group_fallback(int);
int dh_gen_key(DH *, int);
int dh_pub_is_valid(const DH *, const BIGNUM *);
+int dh_is_known_group(const DH *);
u_int dh_estimate(int);
void dh_set_moduli_file(const char *);
diff --git a/kex.c b/kex.c
index 36ae36c..1636f25 100644
--- a/kex.c
+++ b/kex.c
@@ -40,6 +40,7 @@
#ifdef WITH_OPENSSL
#include <openssl/crypto.h>
#include <openssl/dh.h>
+#include <openssl/fips.h>
# ifdef HAVE_EVP_KDF_CTX_NEW_ID
# include <openssl/kdf.h>
# endif
@@ -205,7 +206,10 @@ kex_names_valid(const char *names)
for ((p = strsep(&cp, ",")); p && *p != '\0';
(p = strsep(&cp, ","))) {
if (kex_alg_by_name(p) == NULL) {
- error("Unsupported KEX algorithm \"%.100s\"", p);
+ if (FIPS_mode())
+ error("\"%.100s\" is not allowed in FIPS mode", p);
+ else
+ error("Unsupported KEX algorithm \"%.100s\"", p);
free(s);
return 0;
}
diff --git a/kexgexc.c b/kexgexc.c
index e99e0cf..4c3feae 100644
--- a/kexgexc.c
+++ b/kexgexc.c
@@ -28,6 +28,7 @@
#ifdef WITH_OPENSSL
+#include <openssl/fips.h>
#include <sys/types.h>
#include <openssl/dh.h>
@@ -115,6 +116,10 @@ input_kex_dh_gex_group(int type, u_int32_t seq, struct ssh *ssh)
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
+ if (FIPS_mode() && dh_is_known_group(kex->dh) == 0) {
+ r = SSH_ERR_INVALID_ARGUMENT;
+ goto out;
+ }
p = g = NULL; /* belong to kex->dh now */
/* generate and send 'e', client DH public key */
diff --git a/myproposal.h b/myproposal.h
index ee6e9f7..ff8dfa8 100644
--- a/myproposal.h
+++ b/myproposal.h
@@ -56,6 +56,18 @@
"rsa-sha2-512," \
"rsa-sha2-256"
+#define KEX_FIPS_PK_ALG \
+ "ecdsa-sha2-nistp256-cert-v01@openssh.com," \
+ "ecdsa-sha2-nistp384-cert-v01@openssh.com," \
+ "ecdsa-sha2-nistp521-cert-v01@openssh.com," \
+ "rsa-sha2-512-cert-v01@openssh.com," \
+ "rsa-sha2-256-cert-v01@openssh.com," \
+ "ecdsa-sha2-nistp256," \
+ "ecdsa-sha2-nistp384," \
+ "ecdsa-sha2-nistp521," \
+ "rsa-sha2-512," \
+ "rsa-sha2-256," \
+
#define KEX_SERVER_ENCRYPT \
"chacha20-poly1305@openssh.com," \
"aes128-ctr,aes192-ctr,aes256-ctr," \
@@ -77,6 +89,27 @@
#define KEX_CLIENT_MAC KEX_SERVER_MAC
+#define KEX_FIPS_ENCRYPT \
+ "aes128-ctr,aes192-ctr,aes256-ctr," \
+ "aes128-cbc,3des-cbc," \
+ "aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se," \
+ "aes128-gcm@openssh.com,aes256-gcm@openssh.com"
+#define KEX_DEFAULT_KEX_FIPS \
+ "ecdh-sha2-nistp256," \
+ "ecdh-sha2-nistp384," \
+ "ecdh-sha2-nistp521," \
+ "diffie-hellman-group-exchange-sha256," \
+ "diffie-hellman-group16-sha512," \
+ "diffie-hellman-group18-sha512," \
+ "diffie-hellman-group14-sha256"
+#define KEX_FIPS_MAC \
+ "hmac-sha1," \
+ "hmac-sha2-256," \
+ "hmac-sha2-512," \
+ "hmac-sha1-etm@openssh.com," \
+ "hmac-sha2-256-etm@openssh.com," \
+ "hmac-sha2-512-etm@openssh.com"
+
/* Not a KEX value, but here so all the algorithm defaults are together */
#define SSH_ALLOWED_CA_SIGALGS \
"ssh-ed25519," \
diff --git a/readconf.c b/readconf.c
index bd8627c..dd22c3c 100644
--- a/readconf.c
+++ b/readconf.c
@@ -24,6 +24,7 @@
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
+#include <openssl/fips.h>
#include <ctype.h>
#include <errno.h>
@@ -2711,11 +2712,16 @@ fill_default_options(Options * options)
all_key = sshkey_alg_list(0, 0, 1, ',');
all_sig = sshkey_alg_list(0, 1, 1, ',');
/* remove unsupported algos from default lists */
- def_cipher = match_filter_allowlist(KEX_CLIENT_ENCRYPT, all_cipher);
- def_mac = match_filter_allowlist(KEX_CLIENT_MAC, all_mac);
- def_kex = match_filter_allowlist(KEX_CLIENT_KEX, all_kex);
- def_key = match_filter_allowlist(KEX_DEFAULT_PK_ALG, all_key);
- def_sig = match_filter_allowlist(SSH_ALLOWED_CA_SIGALGS, all_sig);
+ def_cipher = match_filter_allowlist((FIPS_mode() ?
+ KEX_FIPS_ENCRYPT : KEX_CLIENT_ENCRYPT), all_cipher);
+ def_mac = match_filter_allowlist((FIPS_mode() ?
+ KEX_FIPS_MAC : KEX_CLIENT_MAC), all_mac);
+ def_kex = match_filter_allowlist((FIPS_mode() ?
+ KEX_DEFAULT_KEX_FIPS : KEX_CLIENT_KEX), all_kex);
+ def_key = match_filter_allowlist((FIPS_mode() ?
+ KEX_FIPS_PK_ALG : KEX_DEFAULT_PK_ALG), all_key);
+ def_sig = match_filter_allowlist((FIPS_mode() ?
+ KEX_FIPS_PK_ALG : SSH_ALLOWED_CA_SIGALGS), all_sig);
#define ASSEMBLE(what, defaults, all) \
do { \
if ((r = kex_assemble_names(&options->what, \
diff --git a/sandbox-seccomp-filter.c b/sandbox-seccomp-filter.c
index 139b6fb..5376800 100644
--- a/sandbox-seccomp-filter.c
+++ b/sandbox-seccomp-filter.c
@@ -230,6 +230,9 @@ static const struct sock_filter preauth_insns[] = {
#ifdef __NR_open
SC_DENY(__NR_open, EACCES),
#endif
+#ifdef __NR_socket
+ SC_DENY(__NR_socket, EACCES),
+#endif
#ifdef __NR_openat
SC_DENY(__NR_openat, EACCES),
#endif
diff --git a/servconf.c b/servconf.c
index 0dbf90c..24db0cc 100644
--- a/servconf.c
+++ b/servconf.c
@@ -26,6 +26,7 @@
#ifdef HAVE_NET_ROUTE_H
#include <net/route.h>
#endif
+#include <openssl/fips.h>
#include <ctype.h>
#include <netdb.h>
@@ -230,11 +231,16 @@ assemble_algorithms(ServerOptions *o)
all_key = sshkey_alg_list(0, 0, 1, ',');
all_sig = sshkey_alg_list(0, 1, 1, ',');
/* remove unsupported algos from default lists */
- def_cipher = match_filter_allowlist(KEX_SERVER_ENCRYPT, all_cipher);
- def_mac = match_filter_allowlist(KEX_SERVER_MAC, all_mac);
- def_kex = match_filter_allowlist(KEX_SERVER_KEX, all_kex);
- def_key = match_filter_allowlist(KEX_DEFAULT_PK_ALG, all_key);
- def_sig = match_filter_allowlist(SSH_ALLOWED_CA_SIGALGS, all_sig);
+ def_cipher = match_filter_allowlist((FIPS_mode() ?
+ KEX_FIPS_ENCRYPT : KEX_SERVER_ENCRYPT), all_cipher);
+ def_mac = match_filter_allowlist((FIPS_mode() ?
+ KEX_FIPS_MAC : KEX_SERVER_MAC), all_mac);
+ def_kex = match_filter_allowlist((FIPS_mode() ?
+ KEX_DEFAULT_KEX_FIPS : KEX_SERVER_KEX), all_kex);
+ def_key = match_filter_allowlist((FIPS_mode() ?
+ KEX_FIPS_PK_ALG : KEX_DEFAULT_PK_ALG), all_key);
+ def_sig = match_filter_allowlist((FIPS_mode() ?
+ KEX_FIPS_PK_ALG : SSH_ALLOWED_CA_SIGALGS), all_sig);
#define ASSEMBLE(what, defaults, all) \
do { \
if ((r = kex_assemble_names(&o->what, defaults, all)) != 0) \
diff --git a/ssh-keygen.c b/ssh-keygen.c
index 46f4998..5c48ee0 100644
--- a/ssh-keygen.c
+++ b/ssh-keygen.c
@@ -23,6 +23,7 @@
#include <openssl/pem.h>
#include "openbsd-compat/openssl-compat.h"
#endif
+#include <openssl/fips.h>
#ifdef HAVE_STDINT_H
# include <stdint.h>
@@ -207,6 +208,12 @@ type_bits_valid(int type, const char *name, u_int32_t *bitsp)
#endif
}
#ifdef WITH_OPENSSL
+ if (FIPS_mode()) {
+ if (type == KEY_DSA)
+ fatal("DSA keys are not allowed in FIPS mode");
+ if (type == KEY_ED25519)
+ fatal("ED25519 keys are not allowed in FIPS mode");
+ }
switch (type) {
case KEY_DSA:
if (*bitsp != 1024)
@@ -1113,9 +1120,17 @@ do_gen_all_hostkeys(struct passwd *pw)
first = 1;
printf("%s: generating new host keys: ", __progname);
}
+ type = sshkey_type_from_name(key_types[i].key_type);
+
+ /* Skip the keys that are not supported in FIPS mode */
+ if (FIPS_mode() && (type == KEY_DSA || type == KEY_ED25519)) {
+ logit("Skipping %s key in FIPS mode",
+ key_types[i].key_type_display);
+ goto next;
+ }
+
printf("%s ", key_types[i].key_type_display);
fflush(stdout);
- type = sshkey_type_from_name(key_types[i].key_type);
if ((fd = mkstemp(prv_tmp)) == -1) {
error("Could not save your private key in %s: %s",
prv_tmp, strerror(errno));
diff --git a/ssh-rsa.c b/ssh-rsa.c
index 88a98fd..17662be 100644
--- a/ssh-rsa.c
+++ b/ssh-rsa.c
@@ -25,6 +25,7 @@
#include <openssl/err.h>
#include <openssl/core_names.h>
#include <openssl/param_build.h>
+#include <openssl/fips.h>
#include <stdarg.h>
#include <string.h>
@@ -162,6 +163,8 @@ ssh_rsa_generate(struct sshkey *k, int bits)
goto out;
if (EVP_PKEY_keygen(ctx, &res) <= 0) {
+ if (FIPS_mode())
+ logit_f("the key length might be unsupported by FIPS mode approved key generation method");
ret = SSH_ERR_LIBCRYPTO_ERROR;
goto out;
}
diff --git a/ssh.c b/ssh.c
index 4caa6e1..d144a25 100644
--- a/ssh.c
+++ b/ssh.c
@@ -77,6 +77,7 @@
#include <openssl/evp.h>
#include <openssl/err.h>
#endif
+#include <openssl/fips.h>
#include "openbsd-compat/openssl-compat.h"
#include "openbsd-compat/sys-queue.h"
@@ -1564,6 +1565,10 @@ main(int ac, char **av)
exit(0);
}
+ if (FIPS_mode()) {
+ debug("FIPS mode initialized");
+ }
+
/* Expand SecurityKeyProvider if it refers to an environment variable */
if (options.sk_provider != NULL && *options.sk_provider == '$' &&
strlen(options.sk_provider) > 1) {
diff --git a/sshconnect2.c b/sshconnect2.c
index 1e217e4..1d72a91 100644
--- a/sshconnect2.c
+++ b/sshconnect2.c
@@ -45,6 +45,8 @@
#include <vis.h>
#endif
+#include <openssl/fips.h>
+
#include "openbsd-compat/sys-queue.h"
#include "xmalloc.h"
@@ -276,36 +278,41 @@ ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port,
#if defined(GSSAPI) && defined(WITH_OPENSSL)
if (options.gss_keyex) {
- /* Add the GSSAPI mechanisms currently supported on this
- * client to the key exchange algorithm proposal */
- orig = myproposal[PROPOSAL_KEX_ALGS];
-
- if (options.gss_server_identity) {
- gss_host = xstrdup(options.gss_server_identity);
- } else if (options.gss_trust_dns) {
- gss_host = remote_hostname(ssh);
- /* Fall back to specified host if we are using proxy command
- * and can not use DNS on that socket */
- if (strcmp(gss_host, "UNKNOWN") == 0) {
- free(gss_host);
+ if (FIPS_mode()) {
+ logit("Disabling GSSAPIKeyExchange. Not usable in FIPS mode");
+ options.gss_keyex = 0;
+ } else {
+ /* Add the GSSAPI mechanisms currently supported on this
+ * client to the key exchange algorithm proposal */
+ orig = myproposal[PROPOSAL_KEX_ALGS];
+
+ if (options.gss_server_identity) {
+ gss_host = xstrdup(options.gss_server_identity);
+ } else if (options.gss_trust_dns) {
+ gss_host = remote_hostname(ssh);
+ /* Fall back to specified host if we are using proxy command
+ * and can not use DNS on that socket */
+ if (strcmp(gss_host, "UNKNOWN") == 0) {
+ free(gss_host);
+ gss_host = xstrdup(host);
+ }
+ } else {
gss_host = xstrdup(host);
}
- } else {
- gss_host = xstrdup(host);
- }
- gss = ssh_gssapi_client_mechanisms(gss_host,
- options.gss_client_identity, options.gss_kex_algorithms);
- if (gss) {
- debug("Offering GSSAPI proposal: %s", gss);
- xasprintf(&myproposal[PROPOSAL_KEX_ALGS],
- "%s,%s", gss, orig);
-
- /* If we've got GSSAPI algorithms, then we also support the
- * 'null' hostkey, as a last resort */
- orig = myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS];
- xasprintf(&myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS],
- "%s,null", orig);
+ gss = ssh_gssapi_client_mechanisms(gss_host,
+ options.gss_client_identity, options.gss_kex_algorithms);
+ if (gss) {
+ debug("Offering GSSAPI proposal: %s", gss);
+ xasprintf(&myproposal[PROPOSAL_KEX_ALGS],
+ "%s,%s", gss, orig);
+
+ /* If we've got GSSAPI algorithms, then we also support the
+ * 'null' hostkey, as a last resort */
+ orig = myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS];
+ xasprintf(&myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS],
+ "%s,null", orig);
+ }
}
}
#endif
diff --git a/sshd.c b/sshd.c
index 595e44a..f49e2e5 100644
--- a/sshd.c
+++ b/sshd.c
@@ -69,6 +69,7 @@
#endif
#include <pwd.h>
#include <signal.h>
+#include <syslog.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
@@ -80,6 +81,7 @@
#include <openssl/dh.h>
#include <openssl/bn.h>
#include <openssl/rand.h>
+#include <openssl/fips.h>
#include "openbsd-compat/openssl-compat.h"
#endif
@@ -1665,6 +1667,7 @@ main(int ac, char **av)
sigemptyset(&sigmask);
sigprocmask(SIG_SETMASK, &sigmask, NULL);
+ OpenSSL_add_all_algorithms();
/* Save argv. Duplicate so setproctitle emulation doesn't clobber it */
saved_argc = ac;
rexec_argc = ac;
@@ -2160,6 +2163,10 @@ main(int ac, char **av)
/* Reinitialize the log (because of the fork above). */
log_init(__progname, options.log_level, options.log_facility, log_stderr);
+ if (FIPS_mode()) {
+ debug("FIPS mode initialized");
+ }
+
/*
* Chdir to the root directory so that the current disk can be
* unmounted if desired.
@@ -2535,10 +2542,14 @@ do_ssh2_kex(struct ssh *ssh)
if (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]) == 0)
orig = NULL;
- if (options.gss_keyex)
- gss = ssh_gssapi_server_mechanisms();
- else
- gss = NULL;
+ if (options.gss_keyex) {
+ if (FIPS_mode()) {
+ logit("Disabling GSSAPIKeyExchange. Not usable in FIPS mode");
+ options.gss_keyex = 0;
+ } else {
+ gss = ssh_gssapi_server_mechanisms();
+ }
+ }
if (gss && orig)
xasprintf(&newstr, "%s,%s", gss, orig);
diff --git a/sshkey.c b/sshkey.c
index 1aee244..be2c399 100644
--- a/sshkey.c
+++ b/sshkey.c
@@ -34,6 +34,7 @@
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/pem.h>
+#include <openssl/crypto.h>
#include <openssl/core_names.h>
#include <openssl/param_build.h>
#endif
--
2.33.0
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