auth.h revision 181111
1/* $OpenBSD: auth.h,v 1.61 2008/07/02 12:03:51 dtucker Exp $ */ 2 3/* 4 * Copyright (c) 2000 Markus Friedl. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28#ifndef AUTH_H 29#define AUTH_H 30 31#include <signal.h> 32 33#include <openssl/rsa.h> 34 35#ifdef HAVE_LOGIN_CAP 36#include <login_cap.h> 37#endif 38#ifdef BSD_AUTH 39#include <bsd_auth.h> 40#endif 41#ifdef KRB5 42#include <krb5.h> 43#endif 44 45typedef struct Authctxt Authctxt; 46typedef struct Authmethod Authmethod; 47typedef struct KbdintDevice KbdintDevice; 48 49struct Authctxt { 50 sig_atomic_t success; 51 int authenticated; /* authenticated and alarms cancelled */ 52 int postponed; /* authentication needs another step */ 53 int valid; /* user exists and is allowed to login */ 54 int attempt; 55 int failures; 56 int force_pwchange; 57 char *user; /* username sent by the client */ 58 char *service; 59 struct passwd *pw; /* set if 'valid' */ 60 char *style; 61 void *kbdintctxt; 62#ifdef BSD_AUTH 63 auth_session_t *as; 64#endif 65#ifdef KRB5 66 krb5_context krb5_ctx; 67 krb5_ccache krb5_fwd_ccache; 68 krb5_principal krb5_user; 69 char *krb5_ticket_file; 70 char *krb5_ccname; 71#endif 72 Buffer *loginmsg; 73 void *methoddata; 74}; 75/* 76 * Every authentication method has to handle authentication requests for 77 * non-existing users, or for users that are not allowed to login. In this 78 * case 'valid' is set to 0, but 'user' points to the username requested by 79 * the client. 80 */ 81 82struct Authmethod { 83 char *name; 84 int (*userauth)(Authctxt *authctxt); 85 int *enabled; 86}; 87 88/* 89 * Keyboard interactive device: 90 * init_ctx returns: non NULL upon success 91 * query returns: 0 - success, otherwise failure 92 * respond returns: 0 - success, 1 - need further interaction, 93 * otherwise - failure 94 */ 95struct KbdintDevice 96{ 97 const char *name; 98 void* (*init_ctx)(Authctxt*); 99 int (*query)(void *ctx, char **name, char **infotxt, 100 u_int *numprompts, char ***prompts, u_int **echo_on); 101 int (*respond)(void *ctx, u_int numresp, char **responses); 102 void (*free_ctx)(void *ctx); 103}; 104 105int auth_rhosts(struct passwd *, const char *); 106int 107auth_rhosts2(struct passwd *, const char *, const char *, const char *); 108 109int auth_rhosts_rsa(Authctxt *, char *, Key *); 110int auth_password(Authctxt *, const char *); 111int auth_rsa(Authctxt *, BIGNUM *); 112int auth_rsa_challenge_dialog(Key *); 113BIGNUM *auth_rsa_generate_challenge(Key *); 114int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 115int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 116 117int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 118int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 119int user_key_allowed(struct passwd *, Key *); 120 121#ifdef KRB5 122int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 123int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 124int auth_krb5_password(Authctxt *authctxt, const char *password); 125void krb5_cleanup_proc(Authctxt *authctxt); 126#endif /* KRB5 */ 127 128#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) 129#include <shadow.h> 130int auth_shadow_acctexpired(struct spwd *); 131int auth_shadow_pwexpired(Authctxt *); 132#endif 133 134#include "auth-pam.h" 135#include "audit.h" 136void remove_kbdint_device(const char *); 137 138void disable_forwarding(void); 139 140void do_authentication(Authctxt *); 141void do_authentication2(Authctxt *); 142 143void auth_log(Authctxt *, int, char *, char *); 144void userauth_finish(Authctxt *, int, char *); 145void userauth_send_banner(const char *); 146int auth_root_allowed(char *); 147 148char *auth2_read_banner(void); 149 150void privsep_challenge_enable(void); 151 152int auth2_challenge(Authctxt *, char *); 153void auth2_challenge_stop(Authctxt *); 154int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 155int bsdauth_respond(void *, u_int, char **); 156int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 157int skey_respond(void *, u_int, char **); 158 159int allowed_user(struct passwd *); 160struct passwd * getpwnamallow(const char *user); 161 162char *get_challenge(Authctxt *); 163int verify_response(Authctxt *, const char *); 164void abandon_challenge_response(Authctxt *); 165 166char *authorized_keys_file(struct passwd *); 167char *authorized_keys_file2(struct passwd *); 168 169FILE *auth_openkeyfile(const char *, struct passwd *, int); 170 171HostStatus 172check_key_in_hostfiles(struct passwd *, Key *, const char *, 173 const char *, const char *); 174 175/* hostkey handling */ 176Key *get_hostkey_by_index(int); 177Key *get_hostkey_by_type(int); 178int get_hostkey_index(Key *); 179int ssh1_session_key(BIGNUM *); 180 181/* debug messages during authentication */ 182void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 183void auth_debug_send(void); 184void auth_debug_reset(void); 185 186struct passwd *fakepw(void); 187 188int sys_auth_passwd(Authctxt *, const char *); 189 190#define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 191 192#define SKEY_PROMPT "\nS/Key Password: " 193 194#if defined(KRB5) && !defined(HEIMDAL) 195#include <krb5.h> 196krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); 197#endif 198#endif 199