auth.h revision 147005
1/* $OpenBSD: auth.h,v 1.50 2004/05/23 23:59:53 dtucker Exp $ */ 2/* $FreeBSD: head/crypto/openssh/auth.h 147005 2005-06-05 15:46:09Z des $ */ 3 4/* 5 * Copyright (c) 2000 Markus Friedl. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 29#ifndef AUTH_H 30#define AUTH_H 31 32#include "key.h" 33#include "hostfile.h" 34#include "buffer.h" 35#include <openssl/rsa.h> 36 37#ifdef HAVE_LOGIN_CAP 38#include <login_cap.h> 39#endif 40#ifdef BSD_AUTH 41#include <bsd_auth.h> 42#endif 43#ifdef KRB5 44#include <krb5.h> 45#endif 46 47typedef struct Authctxt Authctxt; 48typedef struct Authmethod Authmethod; 49typedef struct KbdintDevice KbdintDevice; 50 51struct Authctxt { 52 int success; 53 int postponed; /* authentication needs another step */ 54 int valid; /* user exists and is allowed to login */ 55 int attempt; 56 int failures; 57 int force_pwchange; 58 char *user; /* username sent by the client */ 59 char *service; 60 struct passwd *pw; /* set if 'valid' */ 61 char *style; 62 void *kbdintctxt; 63#ifdef BSD_AUTH 64 auth_session_t *as; 65#endif 66#ifdef KRB5 67 krb5_context krb5_ctx; 68 krb5_ccache krb5_fwd_ccache; 69 krb5_principal krb5_user; 70 char *krb5_ticket_file; 71 char *krb5_ccname; 72#endif 73 Buffer *loginmsg; 74 void *methoddata; 75}; 76/* 77 * Every authentication method has to handle authentication requests for 78 * non-existing users, or for users that are not allowed to login. In this 79 * case 'valid' is set to 0, but 'user' points to the username requested by 80 * the client. 81 */ 82 83struct Authmethod { 84 char *name; 85 int (*userauth)(Authctxt *authctxt); 86 int *enabled; 87}; 88 89/* 90 * Keyboard interactive device: 91 * init_ctx returns: non NULL upon success 92 * query returns: 0 - success, otherwise failure 93 * respond returns: 0 - success, 1 - need further interaction, 94 * otherwise - failure 95 */ 96struct KbdintDevice 97{ 98 const char *name; 99 void* (*init_ctx)(Authctxt*); 100 int (*query)(void *ctx, char **name, char **infotxt, 101 u_int *numprompts, char ***prompts, u_int **echo_on); 102 int (*respond)(void *ctx, u_int numresp, char **responses); 103 void (*free_ctx)(void *ctx); 104}; 105 106int auth_rhosts(struct passwd *, const char *); 107int 108auth_rhosts2(struct passwd *, const char *, const char *, const char *); 109 110int auth_rhosts_rsa(Authctxt *, char *, Key *); 111int auth_password(Authctxt *, const char *); 112int auth_rsa(Authctxt *, BIGNUM *); 113int auth_rsa_challenge_dialog(Key *); 114BIGNUM *auth_rsa_generate_challenge(Key *); 115int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 116int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 117 118int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 119int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 120int user_key_allowed(struct passwd *, Key *); 121 122#ifdef KRB5 123int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 124int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 125int auth_krb5_password(Authctxt *authctxt, const char *password); 126void krb5_cleanup_proc(Authctxt *authctxt); 127#endif /* KRB5 */ 128 129#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) 130#include <shadow.h> 131int auth_shadow_acctexpired(struct spwd *); 132int auth_shadow_pwexpired(Authctxt *); 133#endif 134 135#include "auth-pam.h" 136#include "audit.h" 137void remove_kbdint_device(const char *); 138 139void disable_forwarding(void); 140 141void do_authentication(Authctxt *); 142void do_authentication2(Authctxt *); 143 144void auth_log(Authctxt *, int, char *, char *); 145void userauth_finish(Authctxt *, int, char *); 146void userauth_send_banner(const char *); 147int auth_root_allowed(char *); 148 149char *auth2_read_banner(void); 150 151void privsep_challenge_enable(void); 152 153int auth2_challenge(Authctxt *, char *); 154void auth2_challenge_stop(Authctxt *); 155int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 156int bsdauth_respond(void *, u_int, char **); 157int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 158int skey_respond(void *, u_int, char **); 159 160int allowed_user(struct passwd *); 161struct passwd * getpwnamallow(const char *user); 162 163char *get_challenge(Authctxt *); 164int verify_response(Authctxt *, const char *); 165void abandon_challenge_response(Authctxt *); 166 167char *expand_filename(const char *, struct passwd *); 168char *authorized_keys_file(struct passwd *); 169char *authorized_keys_file2(struct passwd *); 170 171int 172secure_filename(FILE *, const char *, struct passwd *, char *, size_t); 173 174HostStatus 175check_key_in_hostfiles(struct passwd *, Key *, const char *, 176 const char *, const char *); 177 178/* hostkey handling */ 179Key *get_hostkey_by_index(int); 180Key *get_hostkey_by_type(int); 181int get_hostkey_index(Key *); 182int ssh1_session_key(BIGNUM *); 183 184/* debug messages during authentication */ 185void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 186void auth_debug_send(void); 187void auth_debug_reset(void); 188 189struct passwd *fakepw(void); 190 191int sys_auth_passwd(Authctxt *, const char *); 192 193#define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 194 195#ifdef SKEY 196#ifdef OPIE 197#define SKEY_PROMPT "\nOPIE Password: " 198#else 199#define SKEY_PROMPT "\nS/Key Password: " 200#endif 201#endif 202 203#endif 204