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openssh/openssh-7.7p1-fips.patch

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# HG changeset patch
# Parent 92d953171b34f6fba18d24085eeeaa24b1d2d5b5
FIPS 140-2 compliance. Perform selftests on start and use only FIPS approved
algorithms.
Index: openssh-7.9p1/Makefile.in
===================================================================
--- openssh-7.9p1.orig/Makefile.in
+++ openssh-7.9p1/Makefile.in
@@ -102,6 +102,8 @@ LIBSSH_OBJS=${LIBOPENSSH_OBJS} \
kexdhs.o kexgexs.o kexecdhs.o kexc25519s.o \
platform-pledge.o platform-tracing.o platform-misc.o
+LIBSSH_OBJS += fips.o
+
SSHOBJS= ssh.o readconf.o clientloop.o sshtty.o \
sshconnect.o sshconnect2.o mux.o
Index: openssh-7.9p1/cipher-ctr.c
===================================================================
--- openssh-7.9p1.orig/cipher-ctr.c
+++ openssh-7.9p1/cipher-ctr.c
@@ -27,6 +27,8 @@
#include "xmalloc.h"
#include "log.h"
+#include "fips.h"
+
/* compatibility with old or broken OpenSSL versions */
#include "openbsd-compat/openssl-compat.h"
@@ -139,6 +141,8 @@ evp_aes_128_ctr(void)
#ifndef SSH_OLD_EVP
aes_ctr.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV;
+ if (fips_mode())
+ aes_ctr.flags |= EVP_CIPH_FLAG_FIPS;
#endif
return (&aes_ctr);
}
Index: openssh-7.9p1/cipher.c
===================================================================
--- openssh-7.9p1.orig/cipher.c
+++ openssh-7.9p1/cipher.c
@@ -51,6 +51,8 @@
#include "openbsd-compat/openssl-compat.h"
+#include "fips.h"
+#include "log.h"
struct sshcipher_ctx {
int plaintext;
@@ -80,7 +82,7 @@ struct sshcipher {
#endif
};
-static const struct sshcipher ciphers[] = {
+static const struct sshcipher ciphers_all[] = {
#ifdef WITH_OPENSSL
#ifndef OPENSSL_NO_DES
{ "3des-cbc", 8, 24, 0, 0, CFLAG_CBC, EVP_des_ede3_cbc },
@@ -111,8 +113,52 @@ static const struct sshcipher ciphers[]
{ NULL, 0, 0, 0, 0, 0, NULL }
};
+static const struct sshcipher ciphers_fips140_2[] = {
+#ifdef WITH_OPENSSL
+ { "aes128-cbc", 16, 16, 0, 0, CFLAG_CBC, EVP_aes_128_cbc },
+ { "aes192-cbc", 16, 24, 0, 0, CFLAG_CBC, EVP_aes_192_cbc },
+ { "aes256-cbc", 16, 32, 0, 0, CFLAG_CBC, EVP_aes_256_cbc },
+ { "rijndael-cbc@lysator.liu.se",
+ 16, 32, 0, 0, CFLAG_CBC, EVP_aes_256_cbc },
+ { "aes128-ctr", 16, 16, 0, 0, 0, EVP_aes_128_ctr },
+ { "aes192-ctr", 16, 24, 0, 0, 0, EVP_aes_192_ctr },
+ { "aes256-ctr", 16, 32, 0, 0, 0, EVP_aes_256_ctr },
+# ifdef OPENSSL_HAVE_EVPGCM
+ { "aes128-gcm@openssh.com",
+ 16, 16, 12, 16, 0, EVP_aes_128_gcm },
+ { "aes256-gcm@openssh.com",
+ 16, 32, 12, 16, 0, EVP_aes_256_gcm },
+# endif /* OPENSSL_HAVE_EVPGCM */
+#else
+ { "aes128-ctr", 16, 16, 0, 0, CFLAG_AESCTR, NULL },
+ { "aes192-ctr", 16, 24, 0, 0, CFLAG_AESCTR, NULL },
+ { "aes256-ctr", 16, 32, 0, 0, CFLAG_AESCTR, NULL },
+#endif
+ { "none", 8, 0, 0, 0, CFLAG_NONE, NULL },
+
+ { NULL, 0, 0, 0, 0, 0, NULL }
+};
+
/*--*/
+/* Returns array of ciphers available depending on selected FIPS mode */
+static const struct sshcipher *
+fips_select_ciphers(void)
+{
+ int fips = fips_mode();
+ switch (fips) {
+ case 0:
+ return ciphers_all;
+ case 1:
+ return ciphers_fips140_2;
+ default:
+ /* should not be reached */
+ fatal("Fatal error: incorrect FIPS mode '%i' at %s:%u",
+ fips, __FILE__, __LINE__);
+ return NULL;
+ }
+}
+
/* Returns a comma-separated list of supported ciphers. */
char *
cipher_alg_list(char sep, int auth_only)
@@ -121,7 +167,7 @@ cipher_alg_list(char sep, int auth_only)
size_t nlen, rlen = 0;
const struct sshcipher *c;
- for (c = ciphers; c->name != NULL; c++) {
+ for (c = fips_select_ciphers(); c->name != NULL; c++) {
if ((c->flags & CFLAG_INTERNAL) != 0)
continue;
if (auth_only && c->auth_len == 0)
@@ -193,7 +239,7 @@ const struct sshcipher *
cipher_by_name(const char *name)
{
const struct sshcipher *c;
- for (c = ciphers; c->name != NULL; c++)
+ for (c = fips_select_ciphers(); c->name != NULL; c++)
if (strcmp(c->name, name) == 0)
return c;
return NULL;
Index: openssh-7.9p1/dh.h
===================================================================
--- openssh-7.9p1.orig/dh.h
+++ openssh-7.9p1/dh.h
@@ -52,6 +52,7 @@ u_int dh_estimate(int);
*/
#define DH_GRP_MIN_RFC 1024
#define DH_GRP_MIN 2048
+#define DH_GRP_MIN_FIPS 2048
#define DH_GRP_MAX 8192
/*
Index: openssh-7.9p1/fips.c
===================================================================
--- /dev/null
+++ openssh-7.9p1/fips.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright (c) 2012 Petr Cerny. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#include "fips.h"
+
+#include "cipher.h"
+#include "dh.h"
+#include "digest.h"
+#include "kex.h"
+#include "sshkey.h"
+#include "mac.h"
+#include "log.h"
+#include "xmalloc.h"
+
+#include <string.h>
+#include <openssl/crypto.h>
+
+/* import from dh.c */
+extern int dh_grp_min;
+
+static int fips_state = -1;
+
+static int
+fips_check_required_env(void)
+{
+ int fips_required = 0;
+ char *env = getenv(SSH_FORCE_FIPS_ENV);
+
+ if (env) {
+ errno = 0;
+ fips_required = strtol(env, NULL, 10);
+ if (errno) {
+ debug("bogus value in the %s environment variable, ignoring\n"
+ , SSH_FORCE_FIPS_ENV);
+ fips_required = 0;
+ } else
+ fips_required = 1;
+ }
+ return fips_required;
+}
+
+int
+fips_mode(void)
+{
+ if (-1 == fips_state) {
+ fips_state = FIPS_mode();
+ if (fips_state)
+ debug("FIPS mode initialized");
+ else {
+ if (fips_check_required_env()) {
+ debug("FIPS mode requested through the environment variable '%s'"
+ , SSH_FORCE_FIPS_ENV);
+ if (!FIPS_mode_set(1))
+ fatal("Unable to enter FIPS mode as requested through the environment variable '%s'"
+ , SSH_FORCE_FIPS_ENV);
+ fips_state = 1;
+ }
+ }
+ }
+ return fips_state;
+}
+
+int
+fips_correct_dgst(int digest)
+{
+ int fips;
+ int rv = -1;
+
+ fips = fips_mode();
+ switch (fips) {
+ case 0:
+ rv = digest;
+ break;
+ case 1:
+ switch (digest) {
+ case SSH_DIGEST_MD5:
+ case SSH_DIGEST_SHA1:
+ debug("MD5/RIPEMD160 digests not allowed in FIPS 140-2 mode"
+ "using SHA-256 instead.");
+ rv = SSH_DIGEST_SHA256;
+ break;
+ default:
+ rv = digest;
+ break;
+ }
+ break;
+ default:
+ /* should not be reached */
+ fatal("Fatal error: incorrect FIPS mode '%i' at %s:%u",
+ fips, __FILE__, __LINE__);
+ }
+
+ return rv;
+}
+
+/*
+ * filter out FIPS disallowed algorithms
+ * *crypto MUST be free()-able - it is assigned newly allocated memory and
+ * the previous one is freed
+ *
+ * returns zero if all algorithms were rejected, non-zero otherwise
+ */
+int
+fips_filter_crypto(char **crypto, fips_filters filter)
+{
+ char *token, *tmp, *tmp_sav, *new;
+ int plus = 0;
+ int valid;
+ int comma = 0;
+ int empty = 1;
+ size_t len;
+
+ tmp = tmp_sav = xstrdup(*crypto);
+
+ len = strlen(tmp) + 1;
+ new = xcalloc(1, len);
+
+ if ('+' == *tmp) {
+ plus = 1;
+ tmp++;
+ }
+
+ while ((token = strsep(&tmp, ",")) != NULL) {
+ switch(filter) {
+ case FIPS_FILTER_CIPHERS:
+ valid = ciphers_valid(token);
+ if (!valid)
+ debug("Cipher '%s' is not allowed in FIPS mode",
+ token);
+ break;
+ case FIPS_FILTER_MACS:
+ valid = mac_valid(token);
+ if (!valid)
+ debug("MAC '%s' is not allowed in FIPS mode",
+ token);
+ break;
+ case FIPS_FILTER_KEX_ALGS:
+ valid = kex_names_valid(token);
+ if (!valid)
+ debug("KEX '%s' is not allowed in FIPS mode",
+ token);
+ break;
+ default:
+ /* should not be reached */
+ fatal("Fatal error: incorrect FIPS filter '%i' requested at %s:%u",
+ filter, __FILE__, __LINE__);
+ }
+
+ if (valid) {
+ empty = 0;
+ if (plus) {
+ strlcat(new, "+", len);
+ plus = 0;
+ }
+ if (comma)
+ strlcat(new, ",", len);
+ else
+ comma = 1;
+ strlcat(new, token, len);
+ }
+ }
+
+ /* free tmp and re-allocate shorter buffer for result if necessary */
+ free(tmp_sav);
+ free(*crypto);
+ *crypto = new;
+
+ return (!empty);
+}
+
+int
+fips_dgst_min(void)
+{
+ int fips;
+ int dgst;
+
+ fips = fips_mode();
+ switch (fips) {
+ case 0:
+ dgst = SSH_DIGEST_MD5;
+ break;
+ case 1:
+ dgst = SSH_DIGEST_SHA256;
+ break;
+ default:
+ /* should not be reached */
+ fatal("Fatal error: incorrect FIPS mode '%i' at %s:%u",
+ fips, __FILE__, __LINE__);
+ }
+ return dgst;
+}
+
+int
+fips_dh_grp_min(void)
+{
+ int fips;
+ int dh;
+
+ fips = fips_mode();
+ switch (fips) {
+ case 0:
+ dh = dh_grp_min;
+ break;
+ case 1:
+ dh = DH_GRP_MIN_FIPS;
+ break;
+ default:
+ /* should not be reached */
+ fatal("Fatal error: incorrect FIPS mode '%i' at %s:%u",
+ fips, __FILE__, __LINE__);
+ }
+ return dh;
+}
+
Index: openssh-7.9p1/fips.h
===================================================================
--- /dev/null
+++ openssh-7.9p1/fips.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2012 Petr Cerny. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef FIPS_H
+#define FIPS_H
+
+#include "sshkey.h"
+
+#define SSH_FORCE_FIPS_ENV "SSH_FORCE_FIPS"
+
+typedef enum {
+ FIPS_FILTER_CIPHERS,
+ FIPS_FILTER_MACS,
+ FIPS_FILTER_KEX_ALGS
+} fips_filters;
+
+int fips_mode(void);
+int fips_correct_dgst(int);
+int fips_dgst_min(void);
+int fips_dh_grp_min(void);
+enum fp_type fips_correct_fp_type(enum fp_type);
+int fips_filter_crypto(char **, fips_filters);
+
+#endif
+
Index: openssh-7.9p1/hmac.c
===================================================================
--- openssh-7.9p1.orig/hmac.c
+++ openssh-7.9p1/hmac.c
@@ -144,7 +144,7 @@ hmac_test(void *key, size_t klen, void *
size_t i;
u_char digest[16];
- if ((ctx = ssh_hmac_start(SSH_DIGEST_MD5)) == NULL)
+ if ((ctx = ssh_hmac_start(fips_correct_dgst(SSH_DIGEST_MD5))) == NULL)
printf("ssh_hmac_start failed");
if (ssh_hmac_init(ctx, key, klen) < 0 ||
ssh_hmac_update(ctx, m, mlen) < 0 ||
Index: openssh-7.9p1/kex.c
===================================================================
--- openssh-7.9p1.orig/kex.c
+++ openssh-7.9p1/kex.c
@@ -54,6 +54,8 @@
#include "sshbuf.h"
#include "digest.h"
+#include "fips.h"
+
/* prototype */
static int kex_choose_conf(struct ssh *);
static int kex_input_newkeys(int, u_int32_t, struct ssh *);
@@ -77,7 +79,7 @@ struct kexalg {
int ec_nid;
int hash_alg;
};
-static const struct kexalg kexalgs[] = {
+static const struct kexalg kexalgs_all[] = {
#ifdef WITH_OPENSSL
{ KEX_DH1, KEX_DH_GRP1_SHA1, 0, SSH_DIGEST_SHA1 },
{ KEX_DH14_SHA1, KEX_DH_GRP14_SHA1, 0, SSH_DIGEST_SHA1 },
@@ -106,6 +108,47 @@ static const struct kexalg kexalgs[] = {
{ NULL, -1, -1, -1},
};
+static const struct kexalg kexalgs_fips140_2[] = {
+#ifdef WITH_OPENSSL
+ { KEX_DH14_SHA1, KEX_DH_GRP14_SHA1, 0, SSH_DIGEST_SHA1 },
+ { KEX_DH14_SHA256, KEX_DH_GRP14_SHA256, 0, SSH_DIGEST_SHA256 },
+ { KEX_DH16_SHA512, KEX_DH_GRP16_SHA512, 0, SSH_DIGEST_SHA512 },
+ { KEX_DH18_SHA512, KEX_DH_GRP18_SHA512, 0, SSH_DIGEST_SHA512 },
+ { KEX_DHGEX_SHA1, KEX_DH_GEX_SHA1, 0, SSH_DIGEST_SHA1 },
+#ifdef HAVE_EVP_SHA256
+ { KEX_DHGEX_SHA256, KEX_DH_GEX_SHA256, 0, SSH_DIGEST_SHA256 },
+#endif /* HAVE_EVP_SHA256 */
+#ifdef OPENSSL_HAS_ECC
+ { KEX_ECDH_SHA2_NISTP256, KEX_ECDH_SHA2,
+ NID_X9_62_prime256v1, SSH_DIGEST_SHA256 },
+ { KEX_ECDH_SHA2_NISTP384, KEX_ECDH_SHA2, NID_secp384r1,
+ SSH_DIGEST_SHA384 },
+# ifdef OPENSSL_HAS_NISTP521
+ { KEX_ECDH_SHA2_NISTP521, KEX_ECDH_SHA2, NID_secp521r1,
+ SSH_DIGEST_SHA512 },
+# endif /* OPENSSL_HAS_NISTP521 */
+#endif /* OPENSSL_HAS_ECC */
+#endif /* WITH_OPENSSL */
+ { NULL, -1, -1, -1},
+};
+
+/* Returns array of macs available depending on selected FIPS mode */
+static const struct kexalg *
+fips_select_kexalgs(void)
+{
+ int fips = fips_mode();
+ switch (fips) {
+ case 0:
+ return kexalgs_all;
+ case 1:
+ return kexalgs_fips140_2;
+ default:
+ /* should not be reached */
+ fatal("Fatal error: incorrect FIPS mode '%i' at %s:%u",
+ fips, __FILE__, __LINE__);
+ }
+}
+
char *
kex_alg_list(char sep)
{
@@ -113,7 +156,7 @@ kex_alg_list(char sep)
size_t nlen, rlen = 0;
const struct kexalg *k;
- for (k = kexalgs; k->name != NULL; k++) {
+ for (k = fips_select_kexalgs(); k->name != NULL; k++) {
if (ret != NULL)
ret[rlen++] = sep;
nlen = strlen(k->name);
@@ -133,7 +176,7 @@ kex_alg_by_name(const char *name)
{
const struct kexalg *k;
- for (k = kexalgs; k->name != NULL; k++) {
+ for (k = fips_select_kexalgs(); k->name != NULL; k++) {
if (strcmp(k->name, name) == 0)
return k;
}
@@ -153,7 +196,10 @@ kex_names_valid(const char *names)
for ((p = strsep(&cp, ",")); p && *p != '\0';
(p = strsep(&cp, ","))) {
if (kex_alg_by_name(p) == NULL) {
+ /* do not complain here - MACs and ciphers checks
+ * are silent here
error("Unsupported KEX algorithm \"%.100s\"", p);
+ */
free(s);
return 0;
}
Index: openssh-7.9p1/kexgexc.c
===================================================================
--- openssh-7.9p1.orig/kexgexc.c
+++ openssh-7.9p1/kexgexc.c
@@ -53,8 +53,7 @@
#include "sshbuf.h"
#include "misc.h"
-/* import from dh.c */
-extern int dh_grp_min;
+#include "fips.h"
static int input_kex_dh_gex_group(int, u_int32_t, struct ssh *);
static int input_kex_dh_gex_reply(int, u_int32_t, struct ssh *);
@@ -68,7 +67,7 @@ kexgex_client(struct ssh *ssh)
nbits = dh_estimate(kex->dh_need * 8);
- kex->min = dh_grp_min;
+ kex->min = fips_dh_grp_min();
kex->max = DH_GRP_MAX;
kex->nbits = nbits;
if (datafellows & SSH_BUG_DHGEX_LARGE)
Index: openssh-7.9p1/kexgexs.c
===================================================================
--- openssh-7.9p1.orig/kexgexs.c
+++ openssh-7.9p1/kexgexs.c
@@ -56,8 +56,7 @@
#include "sshbuf.h"
#include "misc.h"
-/* import from dh.c */
-extern int dh_grp_min;
+#include "fips.h"
static int input_kex_dh_gex_request(int, u_int32_t, struct ssh *);
static int input_kex_dh_gex_init(int, u_int32_t, struct ssh *);
@@ -88,9 +87,9 @@ input_kex_dh_gex_request(int type, u_int
kex->nbits = nbits;
kex->min = min;
kex->max = max;
- min = MAXIMUM(dh_grp_min, min);
+ min = MAXIMUM(fips_dh_grp_min(), min);
max = MINIMUM(DH_GRP_MAX, max);
- nbits = MAXIMUM(dh_grp_min, nbits);
+ nbits = MAXIMUM(fips_dh_grp_min(), nbits);
nbits = MINIMUM(DH_GRP_MAX, nbits);
if (kex->max < kex->min || kex->nbits < kex->min ||
Index: openssh-7.9p1/mac.c
===================================================================
--- openssh-7.9p1.orig/mac.c
+++ openssh-7.9p1/mac.c
@@ -40,6 +40,9 @@
#include "openbsd-compat/openssl-compat.h"
+#include "fips.h"
+#include "log.h"
+
#define SSH_DIGEST 1 /* SSH_DIGEST_XXX */
#define SSH_UMAC 2 /* UMAC (not integrated with OpenSSL) */
#define SSH_UMAC128 3
@@ -54,7 +57,7 @@ struct macalg {
int etm; /* Encrypt-then-MAC */
};
-static const struct macalg macs[] = {
+static const struct macalg macs_all[] = {
/* Encrypt-and-MAC (encrypt-and-authenticate) variants */
{ "hmac-sha1", SSH_DIGEST, SSH_DIGEST_SHA1, 0, 0, 0, 0 },
{ "hmac-sha1-96", SSH_DIGEST, SSH_DIGEST_SHA1, 96, 0, 0, 0 },
@@ -82,6 +85,41 @@ static const struct macalg macs[] = {
{ NULL, 0, 0, 0, 0, 0, 0 }
};
+static const struct macalg macs_fips140_2[] = {
+ /* Encrypt-and-MAC (encrypt-and-authenticate) variants */
+ { "hmac-sha1", SSH_DIGEST, SSH_DIGEST_SHA1, 0, 0, 0, 0 },
+#ifdef HAVE_EVP_SHA256
+ { "hmac-sha2-256", SSH_DIGEST, SSH_DIGEST_SHA256, 0, 0, 0, 0 },
+ { "hmac-sha2-512", SSH_DIGEST, SSH_DIGEST_SHA512, 0, 0, 0, 0 },
+#endif
+
+ /* Encrypt-then-MAC variants */
+ { "hmac-sha1-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA1, 0, 0, 0, 1 },
+#ifdef HAVE_EVP_SHA256
+ { "hmac-sha2-256-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA256, 0, 0, 0, 1 },
+ { "hmac-sha2-512-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA512, 0, 0, 0, 1 },
+#endif
+
+ { NULL, 0, 0, 0, 0, 0, 0 }
+};
+
+/* Returns array of macs available depending on selected FIPS mode */
+static const struct macalg *
+fips_select_macs(void)
+{
+ int fips = fips_mode();
+ switch (fips) {
+ case 0:
+ return macs_all;
+ case 1:
+ return macs_fips140_2;
+ default:
+ /* should not be reached */
+ fatal("Fatal error: incorrect FIPS mode '%i' at %s:%u",
+ fips, __FILE__, __LINE__);
+ }
+}
+
/* Returns a list of supported MACs separated by the specified char. */
char *
mac_alg_list(char sep)
@@ -90,7 +128,7 @@ mac_alg_list(char sep)
size_t nlen, rlen = 0;
const struct macalg *m;
- for (m = macs; m->name != NULL; m++) {
+ for (m = fips_select_macs(); m->name != NULL; m++) {
if (ret != NULL)
ret[rlen++] = sep;
nlen = strlen(m->name);
@@ -129,7 +167,7 @@ mac_setup(struct sshmac *mac, char *name
{
const struct macalg *m;
- for (m = macs; m->name != NULL; m++) {
+ for (m = fips_select_macs(); m->name != NULL; m++) {
if (strcmp(name, m->name) != 0)
continue;
if (mac != NULL)
Index: openssh-7.9p1/myproposal.h
===================================================================
--- openssh-7.9p1.orig/myproposal.h
+++ openssh-7.9p1/myproposal.h
@@ -151,6 +151,8 @@
#else /* WITH_OPENSSL */
+#error "OpenSSL support is needed for FIPS mode to compile"
+
#define KEX_SERVER_KEX \
"curve25519-sha256," \
"curve25519-sha256@libssh.org"
Index: openssh-7.9p1/readconf.c
===================================================================
--- openssh-7.9p1.orig/readconf.c
+++ openssh-7.9p1/readconf.c
@@ -68,6 +68,7 @@
#include "myproposal.h"
#include "digest.h"
#include "dh.h"
+#include "fips.h"
/* Format of the configuration file:
@@ -1825,6 +1826,23 @@ option_clear_or_none(const char *o)
return o == NULL || strcasecmp(o, "none") == 0;
}
+/* remove algorithms not approved for use in FIPS mode, when running in FIPS
+ * mode
+ */
+void
+filter_fips_algorithms(Options *o)
+{
+ if (fips_mode()) {
+ if (!fips_filter_crypto(&o->ciphers, FIPS_FILTER_CIPHERS))
+ fatal("None of selected ciphers can be used in FIPS mode");
+ if (!fips_filter_crypto(&o->macs, FIPS_FILTER_MACS))
+ fatal("None of selected MAC algorithms can be used in FIPS mode");
+ if (!fips_filter_crypto(&o->kex_algorithms, FIPS_FILTER_KEX_ALGS))
+ fatal("None of selected KEX algorithms can be used in FIPS mode");
+ }
+ return;
+}
+
/*
* Initializes options to special values that indicate that they have not yet
* been set. Read_config_file will only set options with this value. Options
@@ -2025,9 +2043,9 @@ fill_default_options(Options * options)
if (options->number_of_password_prompts == -1)
options->number_of_password_prompts = 3;
if (options->kex_dhmin == -1)
- options->kex_dhmin = DH_GRP_MIN;
+ options->kex_dhmin = fips_dh_grp_min();
else {
- options->kex_dhmin = MAXIMUM(options->kex_dhmin, DH_GRP_MIN_RFC);
+ options->kex_dhmin = MAXIMUM(options->kex_dhmin, fips_dh_grp_min());
options->kex_dhmin = MINIMUM(options->kex_dhmin, DH_GRP_MAX);
}
dh_grp_min = options->kex_dhmin;
@@ -2112,6 +2130,8 @@ fill_default_options(Options * options)
options->canonicalize_hostname = SSH_CANONICALISE_NO;
if (options->fingerprint_hash == -1)
options->fingerprint_hash = SSH_FP_HASH_DEFAULT;
+ options->fingerprint_hash =
+ fips_correct_dgst(options->fingerprint_hash);
if (options->update_hostkeys == -1)
options->update_hostkeys = 0;
@@ -2594,6 +2614,7 @@ dump_client_config(Options *o, const cha
KEX_DEFAULT_PK_ALG, all_key) != 0)
fatal("%s: kex_assemble_names failed", __func__);
free(all_key);
+ filter_fips_algorithms(o);
/* Most interesting options first: user, host, port */
dump_cfg_string(oUser, o->user);
Index: openssh-7.9p1/readconf.h
===================================================================
--- openssh-7.9p1.orig/readconf.h
+++ openssh-7.9p1/readconf.h
@@ -198,6 +198,7 @@ typedef struct {
#define SSH_STRICT_HOSTKEY_YES 2
#define SSH_STRICT_HOSTKEY_ASK 3
+void filter_fips_algorithms(Options *o);
void initialize_options(Options *);
void fill_default_options(Options *);
void fill_default_options_for_canonicalization(Options *);
Index: openssh-7.9p1/servconf.c
===================================================================
--- openssh-7.9p1.orig/servconf.c
+++ openssh-7.9p1/servconf.c
@@ -65,6 +65,7 @@
#include "myproposal.h"
#include "digest.h"
#include "dh.h"
+#include "fips.h"
/* import from dh.c */
extern int dh_grp_min;
@@ -195,6 +196,23 @@ option_clear_or_none(const char *o)
return o == NULL || strcasecmp(o, "none") == 0;
}
+/* remove algorithms not approved for use in FIPS mode, when running in FIPS
+ * mode
+ */
+static void
+filter_fips_algorithms_s(ServerOptions *o)
+{
+ if (fips_mode()) {
+ if (!fips_filter_crypto(&o->ciphers, FIPS_FILTER_CIPHERS))
+ fatal("None of selected ciphers can be used in FIPS mode");
+ if (!fips_filter_crypto(&o->macs, FIPS_FILTER_MACS))
+ fatal("None of selected MAC algorithms can be used in FIPS mode");
+ if (!fips_filter_crypto(&o->kex_algorithms, FIPS_FILTER_KEX_ALGS))
+ fatal("None of selected KEX algorithms can be used in FIPS mode");
+ }
+ return;
+}
+
static void
assemble_algorithms(ServerOptions *o)
{
@@ -224,6 +242,8 @@ assemble_algorithms(ServerOptions *o)
free(all_kex);
free(all_key);
free(all_sig);
+
+ filter_fips_algorithms_s(o);
}
static void
@@ -273,9 +293,9 @@ fill_default_server_options(ServerOption
options->use_pam_check_locks = 0;
if (options->kex_dhmin == -1)
- options->kex_dhmin = DH_GRP_MIN;
+ options->kex_dhmin = fips_dh_grp_min();
else {
- options->kex_dhmin = MAXIMUM(options->kex_dhmin, DH_GRP_MIN_RFC);
+ options->kex_dhmin = MAXIMUM(options->kex_dhmin, fips_dh_grp_min());
options->kex_dhmin = MINIMUM(options->kex_dhmin, DH_GRP_MAX);
}
dh_grp_min = options->kex_dhmin;
@@ -423,6 +443,8 @@ fill_default_server_options(ServerOption
options->fwd_opts.streamlocal_bind_unlink = 0;
if (options->fingerprint_hash == -1)
options->fingerprint_hash = SSH_FP_HASH_DEFAULT;
+ options->fingerprint_hash =
+ fips_correct_dgst(options->fingerprint_hash);
if (options->disable_forwarding == -1)
options->disable_forwarding = 0;
if (options->expose_userauth_info == -1)
Index: openssh-7.9p1/ssh-keygen.c
===================================================================
--- openssh-7.9p1.orig/ssh-keygen.c
+++ openssh-7.9p1/ssh-keygen.c
@@ -61,6 +61,8 @@
#include "utf8.h"
#include "authfd.h"
+#include "fips.h"
+
#ifdef WITH_OPENSSL
# define DEFAULT_KEY_TYPE_NAME "rsa"
#else
@@ -996,11 +998,13 @@ do_fingerprint(struct passwd *pw)
static void
do_gen_all_hostkeys(struct passwd *pw)
{
- struct {
+ struct Key_types {
char *key_type;
char *key_type_display;
char *path;
- } key_types[] = {
+ };
+
+ struct Key_types key_types_all[] = {
#ifdef WITH_OPENSSL
{ "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
{ "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE },
@@ -1015,6 +1019,17 @@ do_gen_all_hostkeys(struct passwd *pw)
{ NULL, NULL, NULL }
};
+ struct Key_types key_types_fips140_2[] = {
+#ifdef WITH_OPENSSL
+ { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
+#ifdef OPENSSL_HAS_ECC
+ { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE },
+#endif /* OPENSSL_HAS_ECC */
+#endif /* WITH_OPENSSL */
+ { NULL, NULL, NULL }
+ };
+
+ struct Key_types *key_types;
int first = 0;
struct stat st;
struct sshkey *private, *public;
@@ -1022,6 +1037,12 @@ do_gen_all_hostkeys(struct passwd *pw)
int i, type, fd, r;
FILE *f;
+ if (fips_mode()) {
+ key_types = key_types_fips140_2;
+ } else {
+ key_types = key_types_all;
+ }
+
for (i = 0; key_types[i].key_type; i++) {
public = private = NULL;
prv_tmp = pub_tmp = prv_file = pub_file = NULL;
@@ -2817,6 +2838,15 @@ main(int argc, char **argv)
key_type_name = DEFAULT_KEY_TYPE_NAME;
type = sshkey_type_from_name(key_type_name);
+
+ /* protocol v1 is not allowed in FIPS mode, DSA is not acceptable because
+ * it has to be 1024 bit due to RFC 4253 using SHA-1 which implies 1024 bit
+ * keys due to FIPS-186 specification for DSS */
+ if (fips_mode() &&
+ (type == KEY_DSA || type == KEY_ED25519 ||
+ type == KEY_DSA_CERT || type == KEY_ED25519_CERT))
+ fatal("Key type %s not alowed in FIPS mode", key_type_name);
+
type_bits_valid(type, key_type_name, &bits);
if (!quiet)
Index: openssh-7.9p1/ssh_config.0
===================================================================
--- openssh-7.9p1.orig/ssh_config.0
+++ openssh-7.9p1/ssh_config.0
@@ -353,6 +353,9 @@ DESCRIPTION
Specifies the hash algorithm used when displaying key
fingerprints. Valid options are: md5 and sha256 (the default).
+ In the FIPS mode the minimum of SHA-1 is enforced (which means
+ sha256).
+
ForwardAgent
Specifies whether the connection to the authentication agent (if
any) will be forwarded to the remote machine. The argument must
@@ -627,6 +630,9 @@ DESCRIPTION
resort and all efforts should be made to fix the (broken)
counterparty.
+ In the FIPS mode the FIPS standard takes precedence over RFC and
+ forces the minimum to a higher value, currently 2048 bits.
+
LocalCommand
Specifies a command to execute on the local machine after
successfully connecting to the server. The command string
Index: openssh-7.9p1/ssh_config.5
===================================================================
--- openssh-7.9p1.orig/ssh_config.5
+++ openssh-7.9p1/ssh_config.5
@@ -642,6 +642,8 @@ Valid options are:
and
.Cm sha256
(the default).
+.Pp
+In the FIPS mode the minimum of SHA-1 is enforced (which means sha256).
.It Cm ForwardAgent
Specifies whether the connection to the authentication agent (if any)
will be forwarded to the remote machine.
@@ -1063,6 +1065,9 @@ maximum backward compatibility, using it
security and thus should be viewed as a temporary fix of last
resort and all efforts should be made to fix the (broken)
counterparty.
+.Pp
+In the FIPS mode the FIPS standard takes precedence over RFC and
+forces the minimum to a higher value, currently 2048 bits.
.It Cm LocalCommand
Specifies a command to execute on the local machine after successfully
connecting to the server.
Index: openssh-7.9p1/sshd.c
===================================================================
--- openssh-7.9p1.orig/sshd.c
+++ openssh-7.9p1/sshd.c
@@ -123,6 +123,8 @@
#include "version.h"
#include "ssherr.h"
+#include "fips.h"
+
/* Re-exec fds */
#define REEXEC_DEVCRYPTO_RESERVED_FD (STDERR_FILENO + 1)
#define REEXEC_STARTUP_PIPE_FD (STDERR_FILENO + 2)
Index: openssh-7.9p1/sshd_config.0
===================================================================
--- openssh-7.9p1.orig/sshd_config.0
+++ openssh-7.9p1/sshd_config.0
@@ -348,6 +348,9 @@ DESCRIPTION
Specifies the hash algorithm used when logging key fingerprints.
Valid options are: md5 and sha256. The default is sha256.
+ In the FIPS mode the minimum of SHA-1 is enforced (which means
+ sha256).
+
ForceCommand
Forces the execution of the command specified by ForceCommand,
ignoring any command supplied by the client and ~/.ssh/rc if
@@ -572,6 +575,9 @@ DESCRIPTION
resort and all efforts should be made to fix the (broken)
counterparty.
+ In the FIPS mode the FIPS standard takes precedence over RFC and
+ forces the minimum to a higher value, currently 2048 bits.
+
ListenAddress
Specifies the local addresses sshd(8) should listen on. The
following forms may be used:
Index: openssh-7.9p1/sshd_config.5
===================================================================
--- openssh-7.9p1.orig/sshd_config.5
+++ openssh-7.9p1/sshd_config.5
@@ -603,6 +603,8 @@ and
.Cm sha256 .
The default is
.Cm sha256 .
+.Pp
+In the FIPS mode the minimum of SHA-1 is enforced (which means sha256).
.It Cm ForceCommand
Forces the execution of the command specified by
.Cm ForceCommand ,
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