1/* $OpenBSD: auth.h,v 1.76 2013/07/19 07:37:48 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 <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 server_caused_failure; 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 char *info; /* Extra info for next auth_log */ 64 void *jpake_ctx; 65#ifdef BSD_AUTH 66 auth_session_t *as; 67#endif 68 char **auth_methods; /* modified from server config */ 69 u_int num_auth_methods; 70#ifdef KRB5 71 krb5_context krb5_ctx; 72 krb5_ccache krb5_fwd_ccache; 73 krb5_principal krb5_user; 74 char *krb5_ticket_file; 75 char *krb5_ccname; 76#endif 77 Buffer *loginmsg; 78 void *methoddata; 79}; 80/* 81 * Every authentication method has to handle authentication requests for 82 * non-existing users, or for users that are not allowed to login. In this 83 * case 'valid' is set to 0, but 'user' points to the username requested by 84 * the client. 85 */ 86 87struct Authmethod { 88 char *name; 89 int (*userauth)(Authctxt *authctxt); 90 int *enabled; 91}; 92 93/* 94 * Keyboard interactive device: 95 * init_ctx returns: non NULL upon success 96 * query returns: 0 - success, otherwise failure 97 * respond returns: 0 - success, 1 - need further interaction, 98 * otherwise - failure 99 */ 100struct KbdintDevice 101{ 102 const char *name; 103 void* (*init_ctx)(Authctxt*); 104 int (*query)(void *ctx, char **name, char **infotxt, 105 u_int *numprompts, char ***prompts, u_int **echo_on); 106 int (*respond)(void *ctx, u_int numresp, char **responses); 107 void (*free_ctx)(void *ctx); 108}; 109 110int auth_rhosts(struct passwd *, const char *); 111int 112auth_rhosts2(struct passwd *, const char *, const char *, const char *); 113 114int auth_rhosts_rsa(Authctxt *, char *, Key *); 115int auth_password(Authctxt *, const char *); 116int auth_rsa(Authctxt *, BIGNUM *); 117int auth_rsa_challenge_dialog(Key *); 118BIGNUM *auth_rsa_generate_challenge(Key *); 119int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 120int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 121 122int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 123int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 124int user_key_allowed(struct passwd *, Key *); 125void pubkey_auth_info(Authctxt *, const Key *, const char *, ...) 126 __attribute__((__format__ (printf, 3, 4))); 127 128struct stat; 129int auth_secure_path(const char *, struct stat *, const char *, uid_t, 130 char *, size_t); 131 132#ifdef KRB5 133int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); 134int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); 135int auth_krb5_password(Authctxt *authctxt, const char *password); 136void krb5_cleanup_proc(Authctxt *authctxt); 137#endif /* KRB5 */ 138 139#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) 140#include <shadow.h> 141int auth_shadow_acctexpired(struct spwd *); 142int auth_shadow_pwexpired(Authctxt *); 143#endif 144 145#include "auth-pam.h" 146#include "audit.h" 147void remove_kbdint_device(const char *); 148 149void disable_forwarding(void); 150 151void do_authentication(Authctxt *); 152void do_authentication2(Authctxt *); 153 154void auth_info(Authctxt *authctxt, const char *, ...) 155 __attribute__((__format__ (printf, 2, 3))) 156 __attribute__((__nonnull__ (2))); 157void auth_log(Authctxt *, int, int, const char *, const char *); 158void userauth_finish(Authctxt *, int, const char *, const char *); 159int auth_root_allowed(const char *); 160 161void userauth_send_banner(const char *); 162 163char *auth2_read_banner(void); 164int auth2_methods_valid(const char *, int); 165int auth2_update_methods_lists(Authctxt *, const char *, const char *); 166int auth2_setup_methods_lists(Authctxt *); 167int auth2_method_allowed(Authctxt *, const char *, const char *); 168 169void privsep_challenge_enable(void); 170 171int auth2_challenge(Authctxt *, char *); 172void auth2_challenge_stop(Authctxt *); 173int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 174int bsdauth_respond(void *, u_int, char **); 175int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 176int skey_respond(void *, u_int, char **); 177 178void auth2_jpake_get_pwdata(Authctxt *, BIGNUM **, char **, char **); 179void auth2_jpake_stop(Authctxt *); 180 181int allowed_user(struct passwd *); 182struct passwd * getpwnamallow(const char *user); 183 184char *get_challenge(Authctxt *); 185int verify_response(Authctxt *, const char *); 186void abandon_challenge_response(Authctxt *); 187 188char *expand_authorized_keys(const char *, struct passwd *pw); 189char *authorized_principals_file(struct passwd *); 190 191FILE *auth_openkeyfile(const char *, struct passwd *, int); 192FILE *auth_openprincipals(const char *, struct passwd *, int); 193int auth_key_is_revoked(Key *); 194 195HostStatus 196check_key_in_hostfiles(struct passwd *, Key *, const char *, 197 const char *, const char *); 198 199/* hostkey handling */ 200Key *get_hostkey_by_index(int); 201Key *get_hostkey_public_by_index(int); 202Key *get_hostkey_public_by_type(int); 203Key *get_hostkey_private_by_type(int); 204int get_hostkey_index(Key *); 205int ssh1_session_key(BIGNUM *); 206void sshd_hostkey_sign(Key *, Key *, u_char **, u_int *, u_char *, u_int); 207 208/* debug messages during authentication */ 209void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); 210void auth_debug_send(void); 211void auth_debug_reset(void); 212 213struct passwd *fakepw(void); 214 215int sys_auth_passwd(Authctxt *, const char *); 216 217#define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 218 219#define SKEY_PROMPT "\nS/Key Password: " 220 221#if defined(KRB5) && !defined(HEIMDAL) 222#include <krb5.h> 223krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); 224#endif 225#endif 226