}
}
-char *
-auth2_read_banner(void)
-{
- struct stat st;
- char *banner = NULL;
- off_t len, n;
- int fd;
-
- if ((fd = open(options.banner, O_RDONLY)) == -1)
- return (NULL);
- if (fstat(fd, &st) == -1) {
- close(fd);
- return (NULL);
- }
- len = st.st_size;
- banner = xmalloc(len + 1);
- n = atomicio(read, fd, banner, len);
- close(fd);
-
- if (n != len) {
- free(banner);
- return (NULL);
- }
- banner[n] = '\0';
-
- return (banner);
-}
-
-static void
-userauth_banner(void)
-{
- char *banner = NULL;
-
- if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
- return;
-
- if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
- goto done;
-
- packet_start(SSH2_MSG_USERAUTH_BANNER);
- packet_put_cstring(banner);
- packet_put_cstring(""); /* language, unused */
- packet_send();
- debug("userauth_banner: sent");
-done:
- if (banner)
- xfree(banner);
- return;
-}
-
-static int
-userauth_none(Authctxt *authctxt)
-{
- /* disable method "none", only allowed one time */
- Authmethod *m = authmethod_lookup("none");
- if (m != NULL)
- m->enabled = NULL;
- packet_check_eom();
- userauth_banner();
-
- if (authctxt->valid == 0)
- return(0);
-
-#ifdef HAVE_CYGWIN
- if (check_nt_auth(1, authctxt->pw) == 0)
- return(0);
-#endif
- return PRIVSEP(auth_password(authctxt, ""));
-}
-
-static int
-userauth_passwd(Authctxt *authctxt)
-{
- char *password;
- int authenticated = 0;
- int change;
- u_int len;
- change = packet_get_char();
- if (change)
- log("password change not supported");
- password = packet_get_string(&len);
- packet_check_eom();
- if (authctxt->valid &&
-#ifdef HAVE_CYGWIN
- check_nt_auth(1, authctxt->pw) &&
-#endif
- PRIVSEP(auth_password(authctxt, password)) == 1)
- authenticated = 1;
- memset(password, 0, len);
- xfree(password);
- return authenticated;
-}
-
-static int
-userauth_kbdint(Authctxt *authctxt)
-{
- int authenticated = 0;
- char *lang, *devs;
-
- lang = packet_get_string(NULL);
- devs = packet_get_string(NULL);
- packet_check_eom();
-
- debug("keyboard-interactive devs %s", devs);
-
- if (options.challenge_response_authentication)
- authenticated = auth2_challenge(authctxt, devs);
-
-#ifdef USE_PAM
- if (authenticated == 0 && options.pam_authentication_via_kbd_int)
- authenticated = auth2_pam(authctxt);
-#endif
- xfree(devs);
- xfree(lang);
-#ifdef HAVE_CYGWIN
- if (check_nt_auth(0, authctxt->pw) == 0)
- return(0);
-#endif
- return authenticated;
-}
-
-static int
-userauth_pubkey(Authctxt *authctxt)
-{
- Buffer b;
- Key *key = NULL;
- char *pkalg;
- u_char *pkblob, *sig;
- u_int alen, blen, slen;
- int have_sig, pktype;
- int authenticated = 0;
-
- if (!authctxt->valid) {
- debug2("userauth_pubkey: disabled because of invalid user");
- return 0;
- }
- have_sig = packet_get_char();
- if (datafellows & SSH_BUG_PKAUTH) {
- debug2("userauth_pubkey: SSH_BUG_PKAUTH");
- /* no explicit pkalg given */
- pkblob = packet_get_string(&blen);
- buffer_init(&b);
- buffer_append(&b, pkblob, blen);
- /* so we have to extract the pkalg from the pkblob */
- pkalg = buffer_get_string(&b, &alen);
- buffer_free(&b);
- } else {
- pkalg = packet_get_string(&alen);
- pkblob = packet_get_string(&blen);
- }
- pktype = key_type_from_name(pkalg);
- if (pktype == KEY_UNSPEC) {
- /* this is perfectly legal */
- log("userauth_pubkey: unsupported public key algorithm: %s",
- pkalg);
- goto done;
- }
- key = key_from_blob(pkblob, blen);
- if (key == NULL) {
- error("userauth_pubkey: cannot decode key: %s", pkalg);
- goto done;
- }
- if (key->type != pktype) {
- error("userauth_pubkey: type mismatch for decoded key "
- "(received %d, expected %d)", key->type, pktype);
- goto done;
- }
- if (have_sig) {
- sig = packet_get_string(&slen);
- packet_check_eom();
- buffer_init(&b);
- if (datafellows & SSH_OLD_SESSIONID) {
- buffer_append(&b, session_id2, session_id2_len);
- } else {
- buffer_put_string(&b, session_id2, session_id2_len);
- }
- /* reconstruct packet */
- buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
- buffer_put_cstring(&b, authctxt->user);
- buffer_put_cstring(&b,
- datafellows & SSH_BUG_PKSERVICE ?
- "ssh-userauth" :
- authctxt->service);
- if (datafellows & SSH_BUG_PKAUTH) {
- buffer_put_char(&b, have_sig);
- } else {
- buffer_put_cstring(&b, "publickey");
- buffer_put_char(&b, have_sig);
- buffer_put_cstring(&b, pkalg);
- }
- buffer_put_string(&b, pkblob, blen);
-#ifdef DEBUG_PK
- buffer_dump(&b);
-#endif
- /* test for correct signature */
- authenticated = 0;
- if (PRIVSEP(user_key_allowed(authctxt->pw, key)) &&
- PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
- buffer_len(&b))) == 1)
- authenticated = 1;
- buffer_clear(&b);
- xfree(sig);
- } else {
- debug("test whether pkalg/pkblob are acceptable");
- packet_check_eom();
-
- /* XXX fake reply and always send PK_OK ? */
- /*
- * XXX this allows testing whether a user is allowed
- * to login: if you happen to have a valid pubkey this
- * message is sent. the message is NEVER sent at all
- * if a user is not allowed to login. is this an
- * issue? -markus
- */
- if (PRIVSEP(user_key_allowed(authctxt->pw, key))) {
- packet_start(SSH2_MSG_USERAUTH_PK_OK);
- packet_put_string(pkalg, alen);
- packet_put_string(pkblob, blen);
- packet_send();
- packet_write_wait();
- authctxt->postponed = 1;
- }
- }
- if (authenticated != 1)
- auth_clear_options();
-done:
- debug2("userauth_pubkey: authenticated %d pkalg %s", authenticated, pkalg);
- if (key != NULL)
- key_free(key);
- xfree(pkalg);
- xfree(pkblob);
-#ifdef HAVE_CYGWIN
- if (check_nt_auth(0, authctxt->pw) == 0)
- return(0);
-#endif
- return authenticated;
-}
-
-static int
-userauth_hostbased(Authctxt *authctxt)
-{
- Buffer b;
- Key *key = NULL;
- char *pkalg, *cuser, *chost, *service;
- u_char *pkblob, *sig;
- u_int alen, blen, slen;
- int pktype;
- int authenticated = 0;
-
- if (!authctxt->valid) {
- debug2("userauth_hostbased: disabled because of invalid user");
- return 0;
- }
- pkalg = packet_get_string(&alen);
- pkblob = packet_get_string(&blen);
- chost = packet_get_string(NULL);
- cuser = packet_get_string(NULL);
- sig = packet_get_string(&slen);
-
- debug("userauth_hostbased: cuser %s chost %s pkalg %s slen %d",
- cuser, chost, pkalg, slen);
-#ifdef DEBUG_PK
- debug("signature:");
- buffer_init(&b);
- buffer_append(&b, sig, slen);
- buffer_dump(&b);
- buffer_free(&b);
-#endif
- pktype = key_type_from_name(pkalg);
- if (pktype == KEY_UNSPEC) {
- /* this is perfectly legal */
- log("userauth_hostbased: unsupported "
- "public key algorithm: %s", pkalg);
- goto done;
- }
- key = key_from_blob(pkblob, blen);
- if (key == NULL) {
- error("userauth_hostbased: cannot decode key: %s", pkalg);
- goto done;
- }
- if (key->type != pktype) {
- error("userauth_hostbased: type mismatch for decoded key "
- "(received %d, expected %d)", key->type, pktype);
- goto done;
- }
- service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
- authctxt->service;
- buffer_init(&b);
- buffer_put_string(&b, session_id2, session_id2_len);
- /* reconstruct packet */
- buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
- buffer_put_cstring(&b, authctxt->user);
- buffer_put_cstring(&b, service);
- buffer_put_cstring(&b, "hostbased");
- buffer_put_string(&b, pkalg, alen);
- buffer_put_string(&b, pkblob, blen);
- buffer_put_cstring(&b, chost);
- buffer_put_cstring(&b, cuser);
-#ifdef DEBUG_PK
- buffer_dump(&b);
-#endif
- /* test for allowed key and correct signature */
- authenticated = 0;
- if (PRIVSEP(hostbased_key_allowed(authctxt->pw, cuser, chost, key)) &&
- PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
- buffer_len(&b))) == 1)
- authenticated = 1;
-
- buffer_clear(&b);
-done:
- debug2("userauth_hostbased: authenticated %d", authenticated);
- if (key != NULL)
- key_free(key);
- xfree(pkalg);
- xfree(pkblob);
- xfree(cuser);
- xfree(chost);
- xfree(sig);
- return authenticated;
-}
-
/* get current user */
struct passwd*
andersk / openssh.git / commitdiff
