1*e146993eSDag-Erling Smørgrav /* $OpenBSD: auth.h,v 1.69 2011/05/23 03:30:07 djm Exp $ */ 2af12a3e7SDag-Erling Smørgrav 3b66f2d16SKris Kennaway /* 4b66f2d16SKris Kennaway * Copyright (c) 2000 Markus Friedl. All rights reserved. 5b66f2d16SKris Kennaway * 6b66f2d16SKris Kennaway * Redistribution and use in source and binary forms, with or without 7b66f2d16SKris Kennaway * modification, are permitted provided that the following conditions 8b66f2d16SKris Kennaway * are met: 9b66f2d16SKris Kennaway * 1. Redistributions of source code must retain the above copyright 10b66f2d16SKris Kennaway * notice, this list of conditions and the following disclaimer. 11b66f2d16SKris Kennaway * 2. Redistributions in binary form must reproduce the above copyright 12b66f2d16SKris Kennaway * notice, this list of conditions and the following disclaimer in the 13b66f2d16SKris Kennaway * documentation and/or other materials provided with the distribution. 14b66f2d16SKris Kennaway * 15b66f2d16SKris Kennaway * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16b66f2d16SKris Kennaway * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17b66f2d16SKris Kennaway * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18b66f2d16SKris Kennaway * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19b66f2d16SKris Kennaway * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20b66f2d16SKris Kennaway * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21b66f2d16SKris Kennaway * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22b66f2d16SKris Kennaway * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23b66f2d16SKris Kennaway * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24b66f2d16SKris Kennaway * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 255b9b2fafSBrian Feldman * 26b66f2d16SKris Kennaway */ 27af12a3e7SDag-Erling Smørgrav 28a04a10f8SKris Kennaway #ifndef AUTH_H 29a04a10f8SKris Kennaway #define AUTH_H 30a04a10f8SKris Kennaway 31333ee039SDag-Erling Smørgrav #include <signal.h> 32333ee039SDag-Erling Smørgrav 331e8db6e2SBrian Feldman #include <openssl/rsa.h> 341e8db6e2SBrian Feldman 351e8db6e2SBrian Feldman #ifdef HAVE_LOGIN_CAP 361e8db6e2SBrian Feldman #include <login_cap.h> 371e8db6e2SBrian Feldman #endif 381e8db6e2SBrian Feldman #ifdef BSD_AUTH 391e8db6e2SBrian Feldman #include <bsd_auth.h> 401e8db6e2SBrian Feldman #endif 41af12a3e7SDag-Erling Smørgrav #ifdef KRB5 42af12a3e7SDag-Erling Smørgrav #include <krb5.h> 43af12a3e7SDag-Erling Smørgrav #endif 441e8db6e2SBrian Feldman 455b9b2fafSBrian Feldman typedef struct Authctxt Authctxt; 4680628bacSDag-Erling Smørgrav typedef struct Authmethod Authmethod; 47af12a3e7SDag-Erling Smørgrav typedef struct KbdintDevice KbdintDevice; 48af12a3e7SDag-Erling Smørgrav 495b9b2fafSBrian Feldman struct Authctxt { 50333ee039SDag-Erling Smørgrav sig_atomic_t success; 51333ee039SDag-Erling Smørgrav int authenticated; /* authenticated and alarms cancelled */ 52cf2b5f3bSDag-Erling Smørgrav int postponed; /* authentication needs another step */ 53cf2b5f3bSDag-Erling Smørgrav int valid; /* user exists and is allowed to login */ 545b9b2fafSBrian Feldman int attempt; 551e8db6e2SBrian Feldman int failures; 56*e146993eSDag-Erling Smørgrav int server_caused_failure; 571ec0d754SDag-Erling Smørgrav int force_pwchange; 58cf2b5f3bSDag-Erling Smørgrav char *user; /* username sent by the client */ 595b9b2fafSBrian Feldman char *service; 60cf2b5f3bSDag-Erling Smørgrav struct passwd *pw; /* set if 'valid' */ 611e8db6e2SBrian Feldman char *style; 62af12a3e7SDag-Erling Smørgrav void *kbdintctxt; 63cce7d346SDag-Erling Smørgrav void *jpake_ctx; 641e8db6e2SBrian Feldman #ifdef BSD_AUTH 651e8db6e2SBrian Feldman auth_session_t *as; 661e8db6e2SBrian Feldman #endif 67af12a3e7SDag-Erling Smørgrav #ifdef KRB5 68af12a3e7SDag-Erling Smørgrav krb5_context krb5_ctx; 69af12a3e7SDag-Erling Smørgrav krb5_ccache krb5_fwd_ccache; 70af12a3e7SDag-Erling Smørgrav krb5_principal krb5_user; 71af12a3e7SDag-Erling Smørgrav char *krb5_ticket_file; 725962c0e9SDag-Erling Smørgrav char *krb5_ccname; 73af12a3e7SDag-Erling Smørgrav #endif 74aa49c926SDag-Erling Smørgrav Buffer *loginmsg; 75cf2b5f3bSDag-Erling Smørgrav void *methoddata; 765b9b2fafSBrian Feldman }; 77cf2b5f3bSDag-Erling Smørgrav /* 78cf2b5f3bSDag-Erling Smørgrav * Every authentication method has to handle authentication requests for 79cf2b5f3bSDag-Erling Smørgrav * non-existing users, or for users that are not allowed to login. In this 80cf2b5f3bSDag-Erling Smørgrav * case 'valid' is set to 0, but 'user' points to the username requested by 81cf2b5f3bSDag-Erling Smørgrav * the client. 82cf2b5f3bSDag-Erling Smørgrav */ 835b9b2fafSBrian Feldman 8480628bacSDag-Erling Smørgrav struct Authmethod { 8580628bacSDag-Erling Smørgrav char *name; 8680628bacSDag-Erling Smørgrav int (*userauth)(Authctxt *authctxt); 8780628bacSDag-Erling Smørgrav int *enabled; 8880628bacSDag-Erling Smørgrav }; 8980628bacSDag-Erling Smørgrav 901e8db6e2SBrian Feldman /* 91af12a3e7SDag-Erling Smørgrav * Keyboard interactive device: 92af12a3e7SDag-Erling Smørgrav * init_ctx returns: non NULL upon success 93af12a3e7SDag-Erling Smørgrav * query returns: 0 - success, otherwise failure 94af12a3e7SDag-Erling Smørgrav * respond returns: 0 - success, 1 - need further interaction, 95af12a3e7SDag-Erling Smørgrav * otherwise - failure 961e8db6e2SBrian Feldman */ 97af12a3e7SDag-Erling Smørgrav struct KbdintDevice 98af12a3e7SDag-Erling Smørgrav { 99af12a3e7SDag-Erling Smørgrav const char *name; 100af12a3e7SDag-Erling Smørgrav void* (*init_ctx)(Authctxt*); 101af12a3e7SDag-Erling Smørgrav int (*query)(void *ctx, char **name, char **infotxt, 102af12a3e7SDag-Erling Smørgrav u_int *numprompts, char ***prompts, u_int **echo_on); 103af12a3e7SDag-Erling Smørgrav int (*respond)(void *ctx, u_int numresp, char **responses); 104af12a3e7SDag-Erling Smørgrav void (*free_ctx)(void *ctx); 105af12a3e7SDag-Erling Smørgrav }; 1061e8db6e2SBrian Feldman 107af12a3e7SDag-Erling Smørgrav int auth_rhosts(struct passwd *, const char *); 1081e8db6e2SBrian Feldman int 109af12a3e7SDag-Erling Smørgrav auth_rhosts2(struct passwd *, const char *, const char *, const char *); 1101e8db6e2SBrian Feldman 1111ec0d754SDag-Erling Smørgrav int auth_rhosts_rsa(Authctxt *, char *, Key *); 112af12a3e7SDag-Erling Smørgrav int auth_password(Authctxt *, const char *); 1131ec0d754SDag-Erling Smørgrav int auth_rsa(Authctxt *, BIGNUM *); 11480628bacSDag-Erling Smørgrav int auth_rsa_challenge_dialog(Key *); 11580628bacSDag-Erling Smørgrav BIGNUM *auth_rsa_generate_challenge(Key *); 11680628bacSDag-Erling Smørgrav int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 11780628bacSDag-Erling Smørgrav int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 11880628bacSDag-Erling Smørgrav 11980628bacSDag-Erling Smørgrav int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 12080628bacSDag-Erling Smørgrav int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 12180628bacSDag-Erling Smørgrav int user_key_allowed(struct passwd *, Key *); 1221e8db6e2SBrian Feldman 123af12a3e7SDag-Erling Smørgrav #ifdef KRB5 124f388f5efSDag-Erling Smørgrav int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 125af12a3e7SDag-Erling Smørgrav int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 126af12a3e7SDag-Erling Smørgrav int auth_krb5_password(Authctxt *authctxt, const char *password); 1271ec0d754SDag-Erling Smørgrav void krb5_cleanup_proc(Authctxt *authctxt); 128af12a3e7SDag-Erling Smørgrav #endif /* KRB5 */ 129af12a3e7SDag-Erling Smørgrav 1301ec0d754SDag-Erling Smørgrav #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) 1311ec0d754SDag-Erling Smørgrav #include <shadow.h> 1321ec0d754SDag-Erling Smørgrav int auth_shadow_acctexpired(struct spwd *); 1331ec0d754SDag-Erling Smørgrav int auth_shadow_pwexpired(Authctxt *); 1341ec0d754SDag-Erling Smørgrav #endif 1351ec0d754SDag-Erling Smørgrav 136989dd127SDag-Erling Smørgrav #include "auth-pam.h" 137aa49c926SDag-Erling Smørgrav #include "audit.h" 138aa49c926SDag-Erling Smørgrav void remove_kbdint_device(const char *); 139aa49c926SDag-Erling Smørgrav 1401ec0d754SDag-Erling Smørgrav void disable_forwarding(void); 141989dd127SDag-Erling Smørgrav 1421ec0d754SDag-Erling Smørgrav void do_authentication(Authctxt *); 1431ec0d754SDag-Erling Smørgrav void do_authentication2(Authctxt *); 144a04a10f8SKris Kennaway 145af12a3e7SDag-Erling Smørgrav void auth_log(Authctxt *, int, char *, char *); 146af12a3e7SDag-Erling Smørgrav void userauth_finish(Authctxt *, int, char *); 147aa49c926SDag-Erling Smørgrav void userauth_send_banner(const char *); 148af12a3e7SDag-Erling Smørgrav int auth_root_allowed(char *); 1495b9b2fafSBrian Feldman 15080628bacSDag-Erling Smørgrav char *auth2_read_banner(void); 15180628bacSDag-Erling Smørgrav 15280628bacSDag-Erling Smørgrav void privsep_challenge_enable(void); 15380628bacSDag-Erling Smørgrav 154af12a3e7SDag-Erling Smørgrav int auth2_challenge(Authctxt *, char *); 155af12a3e7SDag-Erling Smørgrav void auth2_challenge_stop(Authctxt *); 15680628bacSDag-Erling Smørgrav int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 15780628bacSDag-Erling Smørgrav int bsdauth_respond(void *, u_int, char **); 15880628bacSDag-Erling Smørgrav int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 15980628bacSDag-Erling Smørgrav int skey_respond(void *, u_int, char **); 160a04a10f8SKris Kennaway 161cce7d346SDag-Erling Smørgrav void auth2_jpake_get_pwdata(Authctxt *, BIGNUM **, char **, char **); 162cce7d346SDag-Erling Smørgrav void auth2_jpake_stop(Authctxt *); 163cce7d346SDag-Erling Smørgrav 164af12a3e7SDag-Erling Smørgrav int allowed_user(struct passwd *); 16580628bacSDag-Erling Smørgrav struct passwd * getpwnamallow(const char *user); 1661e8db6e2SBrian Feldman 167af12a3e7SDag-Erling Smørgrav char *get_challenge(Authctxt *); 168af12a3e7SDag-Erling Smørgrav int verify_response(Authctxt *, const char *); 169fc0824d9SDag-Erling Smørgrav void abandon_challenge_response(Authctxt *); 1701e8db6e2SBrian Feldman 171*e146993eSDag-Erling Smørgrav char *expand_authorized_keys(const char *, struct passwd *pw); 172e2f6069cSDag-Erling Smørgrav char *authorized_principals_file(struct passwd *); 173af12a3e7SDag-Erling Smørgrav 174d4af9e69SDag-Erling Smørgrav FILE *auth_openkeyfile(const char *, struct passwd *, int); 175e2f6069cSDag-Erling Smørgrav FILE *auth_openprincipals(const char *, struct passwd *, int); 176b15c8340SDag-Erling Smørgrav int auth_key_is_revoked(Key *); 177af12a3e7SDag-Erling Smørgrav 178af12a3e7SDag-Erling Smørgrav HostStatus 179af12a3e7SDag-Erling Smørgrav check_key_in_hostfiles(struct passwd *, Key *, const char *, 180af12a3e7SDag-Erling Smørgrav const char *, const char *); 181af12a3e7SDag-Erling Smørgrav 18280628bacSDag-Erling Smørgrav /* hostkey handling */ 18380628bacSDag-Erling Smørgrav Key *get_hostkey_by_index(int); 184b15c8340SDag-Erling Smørgrav Key *get_hostkey_public_by_type(int); 185b15c8340SDag-Erling Smørgrav Key *get_hostkey_private_by_type(int); 18680628bacSDag-Erling Smørgrav int get_hostkey_index(Key *); 18780628bacSDag-Erling Smørgrav int ssh1_session_key(BIGNUM *); 18880628bacSDag-Erling Smørgrav 18980628bacSDag-Erling Smørgrav /* debug messages during authentication */ 19080628bacSDag-Erling Smørgrav void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 19180628bacSDag-Erling Smørgrav void auth_debug_send(void); 19280628bacSDag-Erling Smørgrav void auth_debug_reset(void); 19380628bacSDag-Erling Smørgrav 194cf2b5f3bSDag-Erling Smørgrav struct passwd *fakepw(void); 195cf2b5f3bSDag-Erling Smørgrav 196aa49c926SDag-Erling Smørgrav int sys_auth_passwd(Authctxt *, const char *); 197aa49c926SDag-Erling Smørgrav 198a04a10f8SKris Kennaway #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 199a04a10f8SKris Kennaway 200989dd127SDag-Erling Smørgrav #define SKEY_PROMPT "\nS/Key Password: " 201d4ecd108SDag-Erling Smørgrav 202d4ecd108SDag-Erling Smørgrav #if defined(KRB5) && !defined(HEIMDAL) 203d4ecd108SDag-Erling Smørgrav #include <krb5.h> 204d4ecd108SDag-Erling Smørgrav krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); 205d4ecd108SDag-Erling Smørgrav #endif 206a04a10f8SKris Kennaway #endif 207