diff -up openssh-8.6p1/cipher-ctr.c.fips openssh-8.6p1/cipher-ctr.c --- openssh-8.6p1/cipher-ctr.c.fips 2021-04-19 16:53:02.994577324 +0200 +++ openssh-8.6p1/cipher-ctr.c 2021-04-19 16:53:03.064577862 +0200 @@ -179,7 +179,8 @@ 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-8.6p1/dh.c.fips openssh-8.6p1/dh.c --- openssh-8.6p1/dh.c.fips 2021-04-16 05:55:25.000000000 +0200 +++ openssh-8.6p1/dh.c 2021-04-19 16:58:47.750263410 +0200 @@ -164,6 +164,12 @@ 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 +508,38 @@ 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 -up openssh-8.6p1/dh.h.fips openssh-8.6p1/dh.h --- openssh-8.6p1/dh.h.fips 2021-04-19 16:53:03.064577862 +0200 +++ openssh-8.6p1/dh.h 2021-04-19 16:59:31.951616078 +0200 @@ -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 -up openssh-8.6p1/kex.c.fips openssh-8.6p1/kex.c --- openssh-8.6p1/kex.c.fips 2021-04-19 16:53:03.058577815 +0200 +++ openssh-8.6p1/kex.c 2021-04-19 16:53:03.065577869 +0200 @@ -203,7 +203,10 @@ 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 -up openssh-8.6p1/kexgexc.c.fips openssh-8.6p1/kexgexc.c --- openssh-8.6p1/kexgexc.c.fips 2021-04-16 05:55:25.000000000 +0200 +++ openssh-8.6p1/kexgexc.c 2021-04-19 16:53:03.065577869 +0200 @@ -28,6 +28,7 @@ #ifdef WITH_OPENSSL +#include #include #include @@ -115,6 +116,10 @@ input_kex_dh_gex_group(int type, u_int32 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 -up openssh-8.6p1/myproposal.h.fips openssh-8.6p1/myproposal.h --- openssh-8.6p1/myproposal.h.fips 2021-04-16 05:55:25.000000000 +0200 +++ openssh-8.6p1/myproposal.h 2021-04-19 16:53:03.065577869 +0200 @@ -57,6 +57,20 @@ "rsa-sha2-256," \ "ssh-rsa" +#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," \ + "ssh-rsa-cert-v01@openssh.com," \ + "ecdsa-sha2-nistp256," \ + "ecdsa-sha2-nistp384," \ + "ecdsa-sha2-nistp521," \ + "rsa-sha2-512," \ + "rsa-sha2-256," \ + "ssh-rsa" + #define KEX_SERVER_ENCRYPT \ "chacha20-poly1305@openssh.com," \ "aes128-ctr,aes192-ctr,aes256-ctr," \ @@ -78,6 +92,27 @@ #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 -up openssh-8.6p1/readconf.c.fips openssh-8.6p1/readconf.c --- openssh-8.6p1/readconf.c.fips 2021-04-19 16:53:02.999577362 +0200 +++ openssh-8.6p1/readconf.c 2021-04-19 16:53:03.065577869 +0200 @@ -2538,11 +2538,16 @@ 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 -up openssh-8.6p1/sandbox-seccomp-filter.c.fips openssh-8.6p1/sandbox-seccomp-filter.c --- openssh-8.6p1/sandbox-seccomp-filter.c.fips 2021-04-19 16:53:03.034577631 +0200 +++ openssh-8.6p1/sandbox-seccomp-filter.c 2021-04-19 16:53:03.065577869 +0200 @@ -160,6 +160,9 @@ static const struct sock_filter preauth_ #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 -up openssh-8.6p1/servconf.c.fips openssh-8.6p1/servconf.c --- openssh-8.6p1/servconf.c.fips 2021-04-19 16:53:03.027577577 +0200 +++ openssh-8.6p1/servconf.c 2021-04-19 16:53:03.066577877 +0200 @@ -226,11 +226,16 @@ 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 -up openssh-8.6p1/ssh.c.fips openssh-8.6p1/ssh.c --- openssh-8.6p1/ssh.c.fips 2021-04-19 16:53:03.038577662 +0200 +++ openssh-8.6p1/ssh.c 2021-04-19 16:53:03.066577877 +0200 @@ -77,6 +77,7 @@ #include #include #endif +#include #include "openbsd-compat/openssl-compat.h" #include "openbsd-compat/sys-queue.h" @@ -1516,6 +1517,10 @@ 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 -up openssh-8.6p1/sshconnect2.c.fips openssh-8.6p1/sshconnect2.c --- openssh-8.6p1/sshconnect2.c.fips 2021-04-19 16:53:03.055577792 +0200 +++ openssh-8.6p1/sshconnect2.c 2021-04-19 16:53:03.066577877 +0200 @@ -45,6 +45,8 @@ #include #endif +#include + #include "openbsd-compat/sys-queue.h" #include "xmalloc.h" @@ -269,36 +271,41 @@ ssh_kex2(struct ssh *ssh, char *host, st #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 -up openssh-8.6p1/sshd.c.fips openssh-8.6p1/sshd.c --- openssh-8.6p1/sshd.c.fips 2021-04-19 16:53:03.060577831 +0200 +++ openssh-8.6p1/sshd.c 2021-04-19 16:57:45.827769340 +0200 @@ -66,6 +66,7 @@ #include #include #include +#include #include #include #include @@ -77,6 +78,7 @@ #include #include #include +#include #include "openbsd-compat/openssl-compat.h" #endif @@ -1619,6 +1621,7 @@ main(int ac, char **av) #endif __progname = ssh_get_progname(av[0]); + OpenSSL_add_all_algorithms(); /* Save argv. Duplicate so setproctitle emulation doesn't clobber it */ saved_argc = ac; rexec_argc = ac; @@ -2110,6 +2113,10 @@ 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. @@ -2494,10 +2501,14 @@ 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 -up openssh-8.6p1/sshkey.c.fips openssh-8.6p1/sshkey.c --- openssh-8.6p1/sshkey.c.fips 2021-04-19 16:53:03.061577838 +0200 +++ openssh-8.6p1/sshkey.c 2021-04-19 16:53:03.067577885 +0200 @@ -34,6 +34,7 @@ #include #include #include +#include #endif #include "crypto_api.h" @@ -57,6 +58,7 @@ #define SSHKEY_INTERNAL #include "sshkey.h" #include "match.h" +#include "log.h" #include "ssh-sk.h" #ifdef WITH_XMSS @@ -1705,6 +1707,8 @@ rsa_generate_private_key(u_int bits, RSA } if (!BN_set_word(f4, RSA_F4) || !RSA_generate_key_ex(private, bits, f4, NULL)) { + 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 -up openssh-8.6p1/ssh-keygen.c.fips openssh-8.6p1/ssh-keygen.c --- openssh-8.6p1/ssh-keygen.c.fips 2021-04-19 16:53:03.038577662 +0200 +++ openssh-8.6p1/ssh-keygen.c 2021-04-19 16:53:03.068577892 +0200 @@ -205,6 +205,12 @@ type_bits_valid(int type, const char *na #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) @@ -1098,9 +1104,17 @@ 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));