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f9ff105e58
openssh/openssh-5.8p1-fips.patch
Jan F f9ff105e58 another audit improovements
2011-02-24 14:17:34 +01:00

502 lines
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diff -up openssh-5.8p1/authfile.c.fips openssh-5.8p1/authfile.c
--- openssh-5.8p1/authfile.c.fips 2010-12-01 02:03:39.000000000 +0100
+++ openssh-5.8p1/authfile.c 2011-02-24 10:34:41.000000000 +0100
@@ -145,8 +145,14 @@ key_private_rsa1_to_blob(Key *key, Buffe
/* Allocate space for the private part of the key in the buffer. */
cp = buffer_append_space(&encrypted, buffer_len(&buffer));
- cipher_set_key_string(&ciphercontext, cipher, passphrase,
- CIPHER_ENCRYPT);
+ if (cipher_set_key_string(&ciphercontext, cipher, passphrase,
+ CIPHER_ENCRYPT) < 0) {
+ error("cipher_set_key_string failed.");
+ buffer_free(&encrypted);
+ buffer_free(&buffer);
+ return 0;
+ }
+
cipher_crypt(&ciphercontext, cp,
buffer_ptr(&buffer), buffer_len(&buffer));
cipher_cleanup(&ciphercontext);
@@ -447,8 +453,13 @@ key_parse_private_rsa1(Buffer *blob, con
cp = buffer_append_space(&decrypted, buffer_len(blob));
/* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
- cipher_set_key_string(&ciphercontext, cipher, passphrase,
- CIPHER_DECRYPT);
+ if (cipher_set_key_string(&ciphercontext, cipher, passphrase,
+ CIPHER_DECRYPT) < 0) {
+ error("cipher_set_key_string failed.");
+ buffer_free(&decrypted);
+ goto fail;
+ }
+
cipher_crypt(&ciphercontext, cp,
buffer_ptr(blob), buffer_len(blob));
cipher_cleanup(&ciphercontext);
diff -up openssh-5.8p1/cipher.c.fips openssh-5.8p1/cipher.c
--- openssh-5.8p1/cipher.c.fips 2011-02-24 10:34:40.000000000 +0100
+++ openssh-5.8p1/cipher.c 2011-02-24 10:34:41.000000000 +0100
@@ -40,6 +40,7 @@
#include <sys/types.h>
#include <openssl/md5.h>
+#include <openssl/fips.h>
#include <string.h>
#include <stdarg.h>
@@ -85,6 +86,22 @@ struct Cipher ciphers[] = {
{ NULL, SSH_CIPHER_INVALID, 0, 0, 0, 0, NULL }
};
+struct Cipher fips_ciphers[] = {
+ { "none", SSH_CIPHER_NONE, 8, 0, 0, 0, EVP_enc_null },
+ { "3des", SSH_CIPHER_3DES, 8, 16, 0, 1, evp_ssh1_3des },
+
+ { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, 1, EVP_des_ede3_cbc },
+ { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, 1, EVP_aes_128_cbc },
+ { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, 1, EVP_aes_192_cbc },
+ { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, 1, EVP_aes_256_cbc },
+ { "rijndael-cbc@lysator.liu.se",
+ SSH_CIPHER_SSH2, 16, 32, 0, 1, EVP_aes_256_cbc },
+ { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, evp_aes_128_ctr },
+ { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, evp_aes_128_ctr },
+ { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, evp_aes_128_ctr },
+ { NULL, SSH_CIPHER_INVALID, 0, 0, 0, 0, NULL }
+};
+
/*--*/
u_int
@@ -127,7 +144,7 @@ Cipher *
cipher_by_name(const char *name)
{
Cipher *c;
- for (c = ciphers; c->name != NULL; c++)
+ for (c = FIPS_mode() ? fips_ciphers : ciphers; c->name != NULL; c++)
if (strcmp(c->name, name) == 0)
return c;
return NULL;
@@ -137,7 +154,7 @@ Cipher *
cipher_by_number(int id)
{
Cipher *c;
- for (c = ciphers; c->name != NULL; c++)
+ for (c = FIPS_mode() ? fips_ciphers : ciphers; c->name != NULL; c++)
if (c->number == id)
return c;
return NULL;
@@ -181,7 +198,7 @@ cipher_number(const char *name)
Cipher *c;
if (name == NULL)
return -1;
- for (c = ciphers; c->name != NULL; c++)
+ for (c = FIPS_mode() ? fips_ciphers : ciphers; c->name != NULL; c++)
if (strcasecmp(c->name, name) == 0)
return c->number;
return -1;
@@ -288,14 +305,15 @@ cipher_cleanup(CipherContext *cc)
* passphrase and using the resulting 16 bytes as the key.
*/
-void
+int
cipher_set_key_string(CipherContext *cc, Cipher *cipher,
const char *passphrase, int do_encrypt)
{
MD5_CTX md;
u_char digest[16];
- MD5_Init(&md);
+ if (MD5_Init(&md) <= 0)
+ return -1;
MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
MD5_Final(digest, &md);
@@ -303,6 +321,7 @@ cipher_set_key_string(CipherContext *cc,
memset(digest, 0, sizeof(digest));
memset(&md, 0, sizeof(md));
+ return 0;
}
/*
diff -up openssh-5.8p1/cipher-ctr.c.fips openssh-5.8p1/cipher-ctr.c
--- openssh-5.8p1/cipher-ctr.c.fips 2010-10-07 13:06:42.000000000 +0200
+++ openssh-5.8p1/cipher-ctr.c 2011-02-24 10:34:41.000000000 +0100
@@ -140,7 +140,8 @@ evp_aes_128_ctr(void)
aes_ctr.do_cipher = ssh_aes_ctr;
#ifndef SSH_OLD_EVP
aes_ctr.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 (&aes_ctr);
}
diff -up openssh-5.8p1/cipher.h.fips openssh-5.8p1/cipher.h
--- openssh-5.8p1/cipher.h.fips 2011-02-24 10:34:40.000000000 +0100
+++ openssh-5.8p1/cipher.h 2011-02-24 10:34:41.000000000 +0100
@@ -87,7 +87,7 @@ void cipher_init(CipherContext *, Ciphe
const u_char *, u_int, int);
void cipher_crypt(CipherContext *, u_char *, const u_char *, u_int);
void cipher_cleanup(CipherContext *);
-void cipher_set_key_string(CipherContext *, Cipher *, const char *, int);
+int cipher_set_key_string(CipherContext *, Cipher *, const char *, int);
u_int cipher_blocksize(const Cipher *);
u_int cipher_keylen(const Cipher *);
u_int cipher_is_cbc(const Cipher *);
diff -up openssh-5.8p1/key.c.fips openssh-5.8p1/key.c
--- openssh-5.8p1/key.c.fips 2011-02-24 10:35:39.000000000 +0100
+++ openssh-5.8p1/key.c 2011-02-24 10:37:20.000000000 +0100
@@ -40,6 +40,7 @@
#include <sys/types.h>
#include <openssl/evp.h>
+#include <openssl/fips.h>
#include <openbsd-compat/openssl-compat.h>
#include <stdarg.h>
@@ -601,6 +602,8 @@ key_fingerprint_selection(void)
static int rv = -1;
if (rv == -1) {
+ if (FIPS_mode())
+ return (rv = 1);
env = getenv("SSH_FINGERPRINT_TYPE");
rv = env && !strcmp (env, "sha");
}
diff -up openssh-5.8p1/mac.c.fips openssh-5.8p1/mac.c
--- openssh-5.8p1/mac.c.fips 2011-02-24 10:34:40.000000000 +0100
+++ openssh-5.8p1/mac.c 2011-02-24 10:34:41.000000000 +0100
@@ -28,6 +28,7 @@
#include <sys/types.h>
#include <openssl/hmac.h>
+#include <openssl/fips.h>
#include <stdarg.h>
#include <string.h>
@@ -47,14 +48,14 @@
#define SSH_EVP 1 /* OpenSSL EVP-based MAC */
#define SSH_UMAC 2 /* UMAC (not integrated with OpenSSL) */
-struct {
+struct Macs {
char *name;
int type;
const EVP_MD * (*mdfunc)(void);
int truncatebits; /* truncate digest if != 0 */
int key_len; /* just for UMAC */
int len; /* just for UMAC */
-} macs[] = {
+} all_macs[] = {
{ "hmac-sha1", SSH_EVP, EVP_sha1, 0, -1, -1 },
{ "hmac-sha1-96", SSH_EVP, EVP_sha1, 96, -1, -1 },
{ "hmac-md5", SSH_EVP, EVP_md5, 0, -1, -1 },
@@ -65,9 +66,15 @@ struct {
{ NULL, 0, NULL, 0, -1, -1 }
};
+struct Macs fips_macs[] = {
+ { "hmac-sha1", SSH_EVP, EVP_sha1, 0, -1, -1 },
+ { NULL, 0, NULL, 0, -1, -1 }
+};
+
static void
mac_setup_by_id(Mac *mac, int which)
{
+ struct Macs *macs = FIPS_mode() ? fips_macs : all_macs;
int evp_len;
mac->type = macs[which].type;
if (mac->type == SSH_EVP) {
@@ -88,6 +95,7 @@ int
mac_setup(Mac *mac, char *name)
{
int i;
+ struct Macs *macs = FIPS_mode() ? fips_macs : all_macs;
for (i = 0; macs[i].name; i++) {
if (strcmp(name, macs[i].name) == 0) {
diff -up openssh-5.8p1/Makefile.in.fips openssh-5.8p1/Makefile.in
--- openssh-5.8p1/Makefile.in.fips 2011-02-24 10:34:40.000000000 +0100
+++ openssh-5.8p1/Makefile.in 2011-02-24 10:34:41.000000000 +0100
@@ -145,25 +145,25 @@ libssh.a: $(LIBSSH_OBJS)
$(RANLIB) $@
ssh$(EXEEXT): $(LIBCOMPAT) libssh.a $(SSHOBJS)
- $(LD) -o $@ $(SSHOBJS) $(LDFLAGS) -lssh -lopenbsd-compat $(SSHLIBS) $(LIBS)
+ $(LD) -o $@ $(SSHOBJS) $(LDFLAGS) -lssh -lopenbsd-compat -lfipscheck $(SSHLIBS) $(LIBS)
sshd$(EXEEXT): libssh.a $(LIBCOMPAT) $(SSHDOBJS)
- $(LD) -o $@ $(SSHDOBJS) $(LDFLAGS) -lssh -lopenbsd-compat $(SSHDLIBS) $(LIBS)
+ $(LD) -o $@ $(SSHDOBJS) $(LDFLAGS) -lssh -lopenbsd-compat -lfipscheck $(SSHDLIBS) $(LIBS)
scp$(EXEEXT): $(LIBCOMPAT) libssh.a scp.o progressmeter.o
$(LD) -o $@ scp.o progressmeter.o bufaux.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS)
ssh-add$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-add.o
- $(LD) -o $@ ssh-add.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS)
+ $(LD) -o $@ ssh-add.o $(LDFLAGS) -lssh -lopenbsd-compat -lfipscheck $(LIBS)
ssh-agent$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-agent.o ssh-pkcs11-client.o
- $(LD) -o $@ ssh-agent.o ssh-pkcs11-client.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS)
+ $(LD) -o $@ ssh-agent.o ssh-pkcs11-client.o $(LDFLAGS) -lssh -lopenbsd-compat -lfipscheck $(LIBS)
ssh-keygen$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-keygen.o
- $(LD) -o $@ ssh-keygen.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS)
+ $(LD) -o $@ ssh-keygen.o $(LDFLAGS) -lssh -lopenbsd-compat -lfipscheck $(LIBS)
ssh-keysign$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-keysign.o roaming_dummy.o readconf.o
- $(LD) -o $@ ssh-keysign.o readconf.o roaming_dummy.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS)
+ $(LD) -o $@ ssh-keysign.o readconf.o roaming_dummy.o $(LDFLAGS) -lssh -lopenbsd-compat -lfipscheck $(LIBS)
ssh-pkcs11-helper$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-pkcs11-helper.o ssh-pkcs11.o
$(LD) -o $@ ssh-pkcs11-helper.o ssh-pkcs11.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh -lopenbsd-compat $(LIBS)
@@ -172,7 +172,7 @@ ssh-ldap-helper$(EXEEXT): $(LIBCOMPAT) l
$(LD) -o $@ ldapconf.o ldapbody.o ldapmisc.o ldap-helper.o $(LDFLAGS) -lssh -lopenbsd-compat -lfipscheck $(LIBS)
ssh-keyscan$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-keyscan.o roaming_dummy.o
- $(LD) -o $@ ssh-keyscan.o roaming_dummy.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh $(LIBS)
+ $(LD) -o $@ ssh-keyscan.o roaming_dummy.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh -lfipscheck $(LIBS)
sftp-server$(EXEEXT): $(LIBCOMPAT) libssh.a sftp.o sftp-common.o sftp-server.o sftp-server-main.o
$(LD) -o $@ sftp-server.o sftp-common.o sftp-server-main.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS)
diff -up openssh-5.8p1/myproposal.h.fips openssh-5.8p1/myproposal.h
--- openssh-5.8p1/myproposal.h.fips 2011-01-13 12:00:22.000000000 +0100
+++ openssh-5.8p1/myproposal.h 2011-02-24 10:34:41.000000000 +0100
@@ -81,7 +81,12 @@
"hmac-sha1-96,hmac-md5-96"
#define KEX_DEFAULT_COMP "none,zlib@openssh.com,zlib"
#define KEX_DEFAULT_LANG ""
-
+#define KEX_FIPS_ENCRYPT \
+ "aes128-ctr,aes192-ctr,aes256-ctr," \
+ "aes128-cbc,3des-cbc," \
+ "aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se"
+#define KEX_FIPS_MAC \
+ "hmac-sha1"
static char *myproposal[PROPOSAL_MAX] = {
KEX_DEFAULT_KEX,
diff -up openssh-5.8p1/openbsd-compat/bsd-arc4random.c.fips openssh-5.8p1/openbsd-compat/bsd-arc4random.c
--- openssh-5.8p1/openbsd-compat/bsd-arc4random.c.fips 2010-03-25 22:52:02.000000000 +0100
+++ openssh-5.8p1/openbsd-compat/bsd-arc4random.c 2011-02-24 10:34:41.000000000 +0100
@@ -39,6 +39,7 @@
static int rc4_ready = 0;
static RC4_KEY rc4;
+#if 0
unsigned int
arc4random(void)
{
@@ -82,6 +83,32 @@ arc4random_stir(void)
rc4_ready = REKEY_BYTES;
}
+#else
+unsigned int
+arc4random(void)
+{
+ unsigned int r = 0;
+ void *rp = &r;
+
+ if (!rc4_ready) {
+ arc4random_stir();
+ }
+ RAND_bytes(rp, sizeof(r));
+
+ return(r);
+}
+
+void
+arc4random_stir(void)
+{
+ unsigned char rand_buf[SEED_SIZE];
+
+ if (RAND_bytes(rand_buf, sizeof(rand_buf)) <= 0)
+ fatal("Couldn't obtain random bytes (error %ld)",
+ ERR_get_error());
+ rc4_ready = 1;
+}
+#endif
#endif /* !HAVE_ARC4RANDOM */
#ifndef HAVE_ARC4RANDOM_BUF
diff -up openssh-5.8p1/ssh.c.fips openssh-5.8p1/ssh.c
--- openssh-5.8p1/ssh.c.fips 2011-02-04 01:42:15.000000000 +0100
+++ openssh-5.8p1/ssh.c 2011-02-24 10:34:41.000000000 +0100
@@ -73,6 +73,8 @@
#include <openssl/evp.h>
#include <openssl/err.h>
+#include <openssl/fips.h>
+#include <fipscheck.h>
#include "openbsd-compat/openssl-compat.h"
#include "openbsd-compat/sys-queue.h"
@@ -234,6 +236,10 @@ main(int ac, char **av)
sanitise_stdfd();
__progname = ssh_get_progname(av[0]);
+ SSLeay_add_all_algorithms();
+ if (FIPS_mode() && !FIPSCHECK_verify(NULL, NULL)) {
+ fatal("FIPS integrity verification test failed.");
+ }
init_rng();
/*
@@ -300,6 +306,9 @@ main(int ac, char **av)
"ACD:F:I:KL:MNO:PR:S:TVw:W:XYy")) != -1) {
switch (opt) {
case '1':
+ if (FIPS_mode()) {
+ fatal("Protocol 1 not allowed in the FIPS mode.");
+ }
options.protocol = SSH_PROTO_1;
break;
case '2':
@@ -598,7 +607,6 @@ main(int ac, char **av)
if (!host)
usage();
- OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
/* Initialize the command to execute on remote host. */
@@ -684,6 +692,10 @@ main(int ac, char **av)
seed_rng();
+ if (FIPS_mode()) {
+ logit("FIPS mode initialized");
+ }
+
if (options.user == NULL)
options.user = xstrdup(pw->pw_name);
@@ -753,6 +765,12 @@ main(int ac, char **av)
timeout_ms = options.connection_timeout * 1000;
+ if (FIPS_mode()) {
+ options.protocol &= SSH_PROTO_2;
+ if (options.protocol == 0)
+ fatal("Protocol 2 disabled by configuration but required in the FIPS mode.");
+ }
+
/* Open a connection to the remote host. */
if (ssh_connect(host, &hostaddr, options.port,
options.address_family, options.connection_attempts, &timeout_ms,
diff -up openssh-5.8p1/sshconnect2.c.fips openssh-5.8p1/sshconnect2.c
--- openssh-5.8p1/sshconnect2.c.fips 2011-02-24 10:34:40.000000000 +0100
+++ openssh-5.8p1/sshconnect2.c 2011-02-24 10:34:41.000000000 +0100
@@ -44,6 +44,8 @@
#include <vis.h>
#endif
+#include <openssl/fips.h>
+
#include "openbsd-compat/sys-queue.h"
#include "xmalloc.h"
@@ -169,6 +171,10 @@ ssh_kex2(char *host, struct sockaddr *ho
if (options.ciphers != NULL) {
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
+ } else if (FIPS_mode()) {
+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+ myproposal[PROPOSAL_ENC_ALGS_STOC] = KEX_FIPS_ENCRYPT;
+
}
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
@@ -184,7 +190,11 @@ ssh_kex2(char *host, struct sockaddr *ho
if (options.macs != NULL) {
myproposal[PROPOSAL_MAC_ALGS_CTOS] =
myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
+ } else if (FIPS_mode()) {
+ myproposal[PROPOSAL_MAC_ALGS_CTOS] =
+ myproposal[PROPOSAL_MAC_ALGS_STOC] = KEX_FIPS_MAC;
}
+
if (options.hostkeyalgorithms != NULL)
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
options.hostkeyalgorithms;
diff -up openssh-5.8p1/sshd.c.fips openssh-5.8p1/sshd.c
--- openssh-5.8p1/sshd.c.fips 2011-02-24 10:34:41.000000000 +0100
+++ openssh-5.8p1/sshd.c 2011-02-24 10:34:41.000000000 +0100
@@ -76,6 +76,8 @@
#include <openssl/bn.h>
#include <openssl/md5.h>
#include <openssl/rand.h>
+#include <openssl/fips.h>
+#include <fipscheck.h>
#include "openbsd-compat/openssl-compat.h"
#ifdef HAVE_SECUREWARE
@@ -1363,6 +1365,12 @@ main(int ac, char **av)
(void)set_auth_parameters(ac, av);
#endif
__progname = ssh_get_progname(av[0]);
+
+ SSLeay_add_all_algorithms();
+ if (FIPS_mode() && !FIPSCHECK_verify(NULL, NULL)) {
+ fatal("FIPS integrity verification test failed.");
+ }
+
init_rng();
/* Save argv. Duplicate so setproctitle emulation doesn't clobber it */
@@ -1524,8 +1532,6 @@ main(int ac, char **av)
else
closefrom(REEXEC_DEVCRYPTO_RESERVED_FD);
- OpenSSL_add_all_algorithms();
-
/*
* Force logging to stderr until we have loaded the private host
* key (unless started from inetd)
@@ -1644,6 +1650,10 @@ main(int ac, char **av)
debug("private host key: #%d type %d %s", i, key->type,
key_type(key));
}
+ if ((options.protocol & SSH_PROTO_1) && FIPS_mode()) {
+ logit("Disabling protocol version 1. Not allowed in the FIPS mode.");
+ options.protocol &= ~SSH_PROTO_1;
+ }
if ((options.protocol & SSH_PROTO_1) && !sensitive_data.have_ssh1_key) {
logit("Disabling protocol version 1. Could not load host key");
options.protocol &= ~SSH_PROTO_1;
@@ -1808,6 +1818,10 @@ main(int ac, char **av)
/* Initialize the random number generator. */
arc4random_stir();
+ if (FIPS_mode()) {
+ logit("FIPS mode initialized");
+ }
+
/* Chdir to the root directory so that the current disk can be
unmounted if desired. */
chdir("/");
@@ -2349,6 +2363,9 @@ do_ssh2_kex(void)
if (options.ciphers != NULL) {
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
+ } else if (FIPS_mode()) {
+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+ myproposal[PROPOSAL_ENC_ALGS_STOC] = KEX_FIPS_ENCRYPT;
}
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
@@ -2358,6 +2375,9 @@ do_ssh2_kex(void)
if (options.macs != NULL) {
myproposal[PROPOSAL_MAC_ALGS_CTOS] =
myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
+ } else if (FIPS_mode()) {
+ myproposal[PROPOSAL_MAC_ALGS_CTOS] =
+ myproposal[PROPOSAL_MAC_ALGS_STOC] = KEX_FIPS_MAC;
}
if (options.compression == COMP_NONE) {
myproposal[PROPOSAL_COMP_ALGS_CTOS] =
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