auth.h revision 124211
1/* $OpenBSD: auth.h,v 1.46 2003/08/28 12:54:34 markus Exp $ */ 2/* $FreeBSD: head/crypto/openssh/auth.h 124211 2004-01-07 11:16:27Z 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 <openssl/rsa.h> 35 36#ifdef HAVE_LOGIN_CAP 37#include <login_cap.h> 38#endif 39#ifdef BSD_AUTH 40#include <bsd_auth.h> 41#endif 42#ifdef KRB5 43#include <krb5.h> 44#endif 45 46typedef struct Authctxt Authctxt; 47typedef struct Authmethod Authmethod; 48typedef struct KbdintDevice KbdintDevice; 49 50struct Authctxt { 51 int success; 52 int postponed; /* authentication needs another step */ 53 int valid; /* user exists and is allowed to login */ 54 int attempt; 55 int failures; 56 char *user; /* username sent by the client */ 57 char *service; 58 struct passwd *pw; /* set if 'valid' */ 59 char *style; 60 void *kbdintctxt; 61#ifdef BSD_AUTH 62 auth_session_t *as; 63#endif 64#ifdef KRB5 65 krb5_context krb5_ctx; 66 krb5_ccache krb5_fwd_ccache; 67 krb5_principal krb5_user; 68 char *krb5_ticket_file; 69#endif 70 void *methoddata; 71}; 72/* 73 * Every authentication method has to handle authentication requests for 74 * non-existing users, or for users that are not allowed to login. In this 75 * case 'valid' is set to 0, but 'user' points to the username requested by 76 * the client. 77 */ 78 79struct Authmethod { 80 char *name; 81 int (*userauth)(Authctxt *authctxt); 82 int *enabled; 83}; 84 85/* 86 * Keyboard interactive device: 87 * init_ctx returns: non NULL upon success 88 * query returns: 0 - success, otherwise failure 89 * respond returns: 0 - success, 1 - need further interaction, 90 * otherwise - failure 91 */ 92struct KbdintDevice 93{ 94 const char *name; 95 void* (*init_ctx)(Authctxt*); 96 int (*query)(void *ctx, char **name, char **infotxt, 97 u_int *numprompts, char ***prompts, u_int **echo_on); 98 int (*respond)(void *ctx, u_int numresp, char **responses); 99 void (*free_ctx)(void *ctx); 100}; 101 102int auth_rhosts(struct passwd *, const char *); 103int 104auth_rhosts2(struct passwd *, const char *, const char *, const char *); 105 106int auth_rhosts_rsa(struct passwd *, char *, Key *); 107int auth_password(Authctxt *, const char *); 108int auth_rsa(struct passwd *, BIGNUM *); 109int auth_rsa_challenge_dialog(Key *); 110BIGNUM *auth_rsa_generate_challenge(Key *); 111int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 112int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 113 114int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 115int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 116int user_key_allowed(struct passwd *, Key *); 117 118#ifdef KRB5 119int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 120int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 121int auth_krb5_password(Authctxt *authctxt, const char *password); 122void krb5_cleanup_proc(void *authctxt); 123#endif /* KRB5 */ 124 125#include "auth-pam.h" 126 127Authctxt *do_authentication(void); 128Authctxt *do_authentication2(void); 129 130Authctxt *authctxt_new(void); 131void auth_log(Authctxt *, int, char *, char *); 132void userauth_finish(Authctxt *, int, char *); 133int auth_root_allowed(char *); 134 135char *auth2_read_banner(void); 136 137void privsep_challenge_enable(void); 138 139int auth2_challenge(Authctxt *, char *); 140void auth2_challenge_stop(Authctxt *); 141int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 142int bsdauth_respond(void *, u_int, char **); 143int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 144int skey_respond(void *, u_int, char **); 145 146int allowed_user(struct passwd *); 147struct passwd * getpwnamallow(const char *user); 148 149char *get_challenge(Authctxt *); 150int verify_response(Authctxt *, const char *); 151void abandon_challenge_response(Authctxt *); 152 153struct passwd * auth_get_user(void); 154 155char *expand_filename(const char *, struct passwd *); 156char *authorized_keys_file(struct passwd *); 157char *authorized_keys_file2(struct passwd *); 158 159int 160secure_filename(FILE *, const char *, struct passwd *, char *, size_t); 161 162HostStatus 163check_key_in_hostfiles(struct passwd *, Key *, const char *, 164 const char *, const char *); 165 166/* hostkey handling */ 167Key *get_hostkey_by_index(int); 168Key *get_hostkey_by_type(int); 169int get_hostkey_index(Key *); 170int ssh1_session_key(BIGNUM *); 171 172/* debug messages during authentication */ 173void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 174void auth_debug_send(void); 175void auth_debug_reset(void); 176 177struct passwd *fakepw(void); 178 179#define AUTH_FAIL_MAX 6 180#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) 181#define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 182 183#ifdef SKEY 184#ifdef OPIE 185#define SKEY_PROMPT "\nOPIE Password: " 186#else 187#define SKEY_PROMPT "\nS/Key Password: " 188#endif 189#endif 190 191#endif 192