auth.h revision 98941
1/* $OpenBSD: auth.h,v 1.39 2002/05/31 11:35:15 markus 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 "key.h" 32#include "hostfile.h" 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 int success; 51 int postponed; 52 int valid; 53 int attempt; 54 int failures; 55 char *user; 56 char *service; 57 struct passwd *pw; 58 char *style; 59 void *kbdintctxt; 60#ifdef BSD_AUTH 61 auth_session_t *as; 62#endif 63#ifdef KRB4 64 char *krb4_ticket_file; 65#endif 66#ifdef KRB5 67 krb5_context krb5_ctx; 68 krb5_auth_context krb5_auth_ctx; 69 krb5_ccache krb5_fwd_ccache; 70 krb5_principal krb5_user; 71 char *krb5_ticket_file; 72#endif 73}; 74 75struct Authmethod { 76 char *name; 77 int (*userauth)(Authctxt *authctxt); 78 int *enabled; 79}; 80 81/* 82 * Keyboard interactive device: 83 * init_ctx returns: non NULL upon success 84 * query returns: 0 - success, otherwise failure 85 * respond returns: 0 - success, 1 - need further interaction, 86 * otherwise - failure 87 */ 88struct KbdintDevice 89{ 90 const char *name; 91 void* (*init_ctx)(Authctxt*); 92 int (*query)(void *ctx, char **name, char **infotxt, 93 u_int *numprompts, char ***prompts, u_int **echo_on); 94 int (*respond)(void *ctx, u_int numresp, char **responses); 95 void (*free_ctx)(void *ctx); 96}; 97 98int auth_rhosts(struct passwd *, const char *); 99int 100auth_rhosts2(struct passwd *, const char *, const char *, const char *); 101 102int auth_rhosts_rsa(struct passwd *, char *, Key *); 103int auth_password(Authctxt *, const char *); 104int auth_rsa(struct passwd *, BIGNUM *); 105int auth_rsa_challenge_dialog(Key *); 106BIGNUM *auth_rsa_generate_challenge(Key *); 107int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 108int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 109 110int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 111int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 112int user_key_allowed(struct passwd *, Key *); 113 114#ifdef KRB4 115#include <krb.h> 116int auth_krb4(Authctxt *, KTEXT, char **); 117int auth_krb4_password(Authctxt *, const char *); 118void krb4_cleanup_proc(void *); 119 120#ifdef AFS 121#include <kafs.h> 122int auth_krb4_tgt(Authctxt *, const char *); 123int auth_afs_token(Authctxt *, const char *); 124#endif /* AFS */ 125 126#endif /* KRB4 */ 127 128#ifdef KRB5 129int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client); 130int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 131int auth_krb5_password(Authctxt *authctxt, const char *password); 132void krb5_cleanup_proc(void *authctxt); 133#endif /* KRB5 */ 134 135#include "auth-pam.h" 136#include "auth2-pam.h" 137 138Authctxt *do_authentication(void); 139Authctxt *do_authentication2(void); 140 141Authctxt *authctxt_new(void); 142void auth_log(Authctxt *, int, char *, char *); 143void userauth_finish(Authctxt *, int, char *); 144int auth_root_allowed(char *); 145 146char *auth2_read_banner(void); 147 148void privsep_challenge_enable(void); 149 150int auth2_challenge(Authctxt *, char *); 151void auth2_challenge_stop(Authctxt *); 152int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 153int bsdauth_respond(void *, u_int, char **); 154int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 155int skey_respond(void *, u_int, char **); 156 157int allowed_user(struct passwd *); 158struct passwd * getpwnamallow(const char *user); 159 160char *get_challenge(Authctxt *); 161int verify_response(Authctxt *, const char *); 162 163struct passwd * auth_get_user(void); 164 165char *expand_filename(const char *, struct passwd *); 166char *authorized_keys_file(struct passwd *); 167char *authorized_keys_file2(struct passwd *); 168 169int 170secure_filename(FILE *, const char *, struct passwd *, char *, size_t); 171 172HostStatus 173check_key_in_hostfiles(struct passwd *, Key *, const char *, 174 const char *, const char *); 175 176/* hostkey handling */ 177Key *get_hostkey_by_index(int); 178Key *get_hostkey_by_type(int); 179int get_hostkey_index(Key *); 180int ssh1_session_key(BIGNUM *); 181 182/* debug messages during authentication */ 183void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 184void auth_debug_send(void); 185void auth_debug_reset(void); 186 187#define AUTH_FAIL_MAX 6 188#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2) 189#define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 190 191#define SKEY_PROMPT "\nS/Key Password: " 192#endif 193