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openssh/openssh-7.7p1-fips.patch
Hans Petter Jansson 6543c1a02b Accepting request 863944 from home:dirkmueller:branches:network 
- update to 8.4p1:
  Security
  ========
 * ssh-agent(1): restrict ssh-agent from signing web challenges for
   FIDO/U2F keys.
 * ssh-keygen(1): Enable FIDO 2.1 credProtect extension when generating
   a FIDO resident key.
 * ssh(1), ssh-keygen(1): support for FIDO keys that require a PIN for
   each use. These keys may be generated using ssh-keygen using a new
   "verify-required" option. When a PIN-required key is used, the user
   will be prompted for a PIN to complete the signature operation.
  New Features
  ------------
 * sshd(8): authorized_keys now supports a new "verify-required"
   option to require FIDO signatures assert that the token verified
   that the user was present before making the signature. The FIDO
   protocol supports multiple methods for user-verification, but
   currently OpenSSH only supports PIN verification.
 * sshd(8), ssh-keygen(1): add support for verifying FIDO webauthn
   signatures. Webauthn is a standard for using FIDO keys in web
   browsers. These signatures are a slightly different format to plain
   FIDO signatures and thus require explicit support.
 * ssh(1): allow some keywords to expand shell-style ${ENV}
   environment variables. The supported keywords are CertificateFile,
   ControlPath, IdentityAgent and IdentityFile, plus LocalForward and
   RemoteForward when used for Unix domain socket paths. bz#3140
 * ssh(1), ssh-agent(1): allow some additional control over the use of
   ssh-askpass via a new $SSH_ASKPASS_REQUIRE environment variable,
   including forcibly enabling and disabling its use. bz#69
 * ssh(1): allow ssh_config(5)'s AddKeysToAgent keyword accept a time

OBS-URL: https://build.opensuse.org/request/show/863944
OBS-URL: https://build.opensuse.org/package/show/network/openssh?expand=0&rev=222
2021-01-18 01:12:55 +00:00

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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-8.4p1/Makefile.in
===================================================================
--- openssh-8.4p1.orig/Makefile.in
+++ openssh-8.4p1/Makefile.in
@@ -112,6 +112,8 @@ LIBSSH_OBJS=${LIBOPENSSH_OBJS} \
SKOBJS= ssh-sk-client.o
+LIBSSH_OBJS += fips.o
+
SSHOBJS= ssh.o readconf.o clientloop.o sshtty.o \
sshconnect.o sshconnect2.o mux.o $(SKOBJS)
Index: openssh-8.4p1/cipher-ctr.c
===================================================================
--- openssh-8.4p1.orig/cipher-ctr.c
+++ openssh-8.4p1/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-8.4p1/cipher.c
===================================================================
--- openssh-8.4p1.orig/cipher.c
+++ openssh-8.4p1/cipher.c
@@ -51,6 +51,9 @@
#include "openbsd-compat/openssl-compat.h"
+#include "fips.h"
+#include "log.h"
+
#ifndef WITH_OPENSSL
#define EVP_CIPHER_CTX void
#endif
@@ -83,7 +86,7 @@ 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 },
@@ -114,8 +117,52 @@ 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)
@@ -124,7 +171,7 @@ 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)
@@ -207,7 +254,7 @@ 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-8.4p1/fips.c
===================================================================
--- /dev/null
+++ openssh-8.4p1/fips.c
@@ -0,0 +1,212 @@
+/*
+ * 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>
+
+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;
+}
+
Index: openssh-8.4p1/fips.h
===================================================================
--- /dev/null
+++ openssh-8.4p1/fips.h
@@ -0,0 +1,44 @@
+/*
+ * 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);
+enum fp_type fips_correct_fp_type(enum fp_type);
+int fips_filter_crypto(char **, fips_filters);
+
+#endif
+
Index: openssh-8.4p1/hmac.c
===================================================================
--- openssh-8.4p1.orig/hmac.c
+++ openssh-8.4p1/hmac.c
@@ -145,7 +145,7 @@ 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-8.4p1/kex.c
===================================================================
--- openssh-8.4p1.orig/kex.c
+++ openssh-8.4p1/kex.c
@@ -62,6 +62,8 @@
#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 *);
@@ -85,7 +87,7 @@ 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 },
@@ -116,6 +118,47 @@ static const struct kexalg kexalgs[] = {
{ NULL, 0, -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)
{
@@ -123,7 +166,7 @@ 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);
@@ -143,7 +186,7 @@ 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;
}
@@ -163,7 +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) {
+ /* do not complain here - MACs and ciphers checks
+ * are silent here
error("Unsupported KEX algorithm \"%.100s\"", p);
+ */
free(s);
return 0;
}
Index: openssh-8.4p1/mac.c
===================================================================
--- openssh-8.4p1.orig/mac.c
+++ openssh-8.4p1/mac.c
@@ -41,6 +41,9 @@
#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
@@ -55,7 +58,7 @@ 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 },
@@ -79,6 +82,41 @@ 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)
@@ -87,7 +125,7 @@ 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);
@@ -126,7 +164,7 @@ 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-8.4p1/readconf.c
===================================================================
--- openssh-8.4p1.orig/readconf.c
+++ openssh-8.4p1/readconf.c
@@ -68,6 +68,8 @@
#include "myproposal.h"
#include "digest.h"
+#include "fips.h"
+
/* Format of the configuration file:
# Configuration data is parsed as follows:
@@ -1949,6 +1951,23 @@ 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
@@ -2240,6 +2259,9 @@ 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);
+
#ifdef ENABLE_SK_INTERNAL
if (options->sk_provider == NULL)
options->sk_provider = xstrdup("internal");
@@ -2273,6 +2295,7 @@ fill_default_options(Options * options)
ASSEMBLE(pubkey_key_types, def_key, all_key);
ASSEMBLE(ca_sign_algorithms, def_sig, all_sig);
#undef ASSEMBLE
+
free(all_cipher);
free(all_mac);
free(all_kex);
@@ -2284,6 +2307,8 @@ fill_default_options(Options * options)
kex_default_pk_alg_filtered = def_key; /* save for later use */
free(def_sig);
+ filter_fips_algorithms(options);
+
#define CLEAR_ON_NONE(v) \
do { \
if (option_clear_or_none(v)) { \
Index: openssh-8.4p1/readconf.h
===================================================================
--- openssh-8.4p1.orig/readconf.h
+++ openssh-8.4p1/readconf.h
@@ -200,6 +200,7 @@ typedef struct {
#define SSH_STRICT_HOSTKEY_YES 2
#define SSH_STRICT_HOSTKEY_ASK 3
+void filter_fips_algorithms(Options *o);
const char *kex_default_pk_alg(void);
char *ssh_connection_hash(const char *thishost, const char *host,
const char *portstr, const char *user);
Index: openssh-8.4p1/servconf.c
===================================================================
--- openssh-8.4p1.orig/servconf.c
+++ openssh-8.4p1/servconf.c
@@ -70,6 +70,7 @@
#include "auth.h"
#include "myproposal.h"
#include "digest.h"
+#include "fips.h"
static void add_listen_addr(ServerOptions *, const char *,
const char *, int);
@@ -201,6 +202,23 @@ 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)
{
@@ -242,6 +260,8 @@ assemble_algorithms(ServerOptions *o)
free(def_kex);
free(def_key);
free(def_sig);
+
+ filter_fips_algorithms_s(o);
}
static void
@@ -454,6 +474,8 @@ 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-8.4p1/ssh-keygen.c
===================================================================
--- openssh-8.4p1.orig/ssh-keygen.c
+++ openssh-8.4p1/ssh-keygen.c
@@ -66,6 +66,8 @@
#include "ssh-sk.h"
#include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */
+#include "fips.h"
+
#ifdef WITH_OPENSSL
# define DEFAULT_KEY_TYPE_NAME "rsa"
#else
@@ -1036,11 +1038,13 @@ 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 },
@@ -1055,6 +1059,17 @@ 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;
u_int32_t bits = 0;
int first = 0;
struct stat st;
@@ -1062,6 +1077,12 @@ do_gen_all_hostkeys(struct passwd *pw)
char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file;
int i, type, fd, r;
+ 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;
@@ -3586,6 +3607,15 @@ 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-8.4p1/ssh_config.5
===================================================================
--- openssh-8.4p1.orig/ssh_config.5
+++ openssh-8.4p1/ssh_config.5
@@ -682,6 +682,8 @@ 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.
Index: openssh-8.4p1/sshd.c
===================================================================
--- openssh-8.4p1.orig/sshd.c
+++ openssh-8.4p1/sshd.c
@@ -124,6 +124,8 @@
#include "ssherr.h"
#include "sk-api.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-8.4p1/sshd_config.5
===================================================================
--- openssh-8.4p1.orig/sshd_config.5
+++ openssh-8.4p1/sshd_config.5
@@ -594,6 +594,8 @@ 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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