1 /* $MirOS: src/usr.bin/ssh/auth.h,v 1.14 2014/03/28 22:31:54 tg Exp $ */ 2 /* $OpenBSD: auth.h,v 1.63 2009/08/15 18:56:34 fgsch Exp $ */ 3 4 /* 5 * Copyright © 2013 6 * Thorsten “mirabilos” Glaser <tg@mirbsd.org> 7 * Copyright (c) 2000 Markus Friedl. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 */ 30 31 #ifndef AUTH_H 32 #define AUTH_H 33 34 #include <signal.h> 35 36 #include <openssl/rsa.h> 37 38 #ifdef BSD_AUTH 39 #include <bsd_auth.h> 40 #endif 41 42 typedef struct Authctxt Authctxt; 43 typedef struct Authmethod Authmethod; 44 typedef struct KbdintDevice KbdintDevice; 45 46 struct Authctxt { 47 sig_atomic_t success; 48 int authenticated; /* authenticated and alarms cancelled */ 49 int postponed; /* authentication needs another step */ 50 int valid; /* user exists and is allowed to login */ 51 int attempt; 52 int failures; 53 int force_pwchange; 54 char *user; /* username sent by the client */ 55 char *service; 56 struct passwd *pw; /* set if 'valid' */ 57 char *style; 58 void *kbdintctxt; 59 #ifdef BSD_AUTH 60 auth_session_t *as; 61 #endif 62 void *methoddata; 63 }; 64 /* 65 * Every authentication method has to handle authentication requests for 66 * non-existing users, or for users that are not allowed to login. In this 67 * case 'valid' is set to 0, but 'user' points to the username requested by 68 * the client. 69 */ 70 71 struct Authmethod { 72 const char *name; 73 int (*userauth)(Authctxt *authctxt); 74 int *enabled; 75 }; 76 77 /* 78 * Keyboard interactive device: 79 * init_ctx returns: non NULL upon success 80 * query returns: 0 - success, otherwise failure 81 * respond returns: 0 - success, 1 - need further interaction, 82 * otherwise - failure 83 */ 84 struct KbdintDevice 85 { 86 const char *name; 87 void* (*init_ctx)(Authctxt*); 88 int (*query)(void *ctx, char **name, char **infotxt, 89 u_int *numprompts, char ***prompts, u_int **echo_on); 90 int (*respond)(void *ctx, u_int numresp, char **responses); 91 void (*free_ctx)(void *ctx); 92 }; 93 94 int auth_rhosts(struct passwd *, const char *); 95 int 96 auth_rhosts2(struct passwd *, const char *, const char *, const char *); 97 98 int auth_rhosts_rsa(Authctxt *, char *, Key *); 99 int auth_password(Authctxt *, const char *); 100 int auth_rsa(Authctxt *, BIGNUM *); 101 int auth_rsa_challenge_dialog(Key *); 102 BIGNUM *auth_rsa_generate_challenge(Key *); 103 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); 104 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); 105 106 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); 107 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); 108 int user_key_allowed(struct passwd *, Key *); 109 110 void do_authentication(Authctxt *); 111 void do_authentication2(Authctxt *); 112 113 void auth_log(Authctxt *, int, const char *, const char *); 114 void userauth_finish(Authctxt *, int, char *); 115 int auth_root_allowed(const char *); 116 117 char *auth2_read_banner(void); 118 119 void privsep_challenge_enable(void); 120 121 int auth2_challenge(Authctxt *, char *); 122 void auth2_challenge_stop(Authctxt *); 123 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); 124 int bsdauth_respond(void *, u_int, char **); 125 int skey_query(void *, char **, char **, u_int *, char ***, u_int **); 126 int skey_respond(void *, u_int, char **); 127 128 int allowed_user(struct passwd *); 129 struct passwd * getpwnamallow(const char *user); 130 131 char *get_challenge(Authctxt *); 132 int verify_response(Authctxt *, const char *); 133 134 char *authorised_keys_file(struct passwd *); 135 char *authorised_keys_file2(struct passwd *); 136 137 FILE *auth_openkeyfile(const char *, struct passwd *, int); 138 139 HostStatus 140 check_key_in_hostfiles(struct passwd *, Key *, const char *, 141 const char *, const char *); 142 143 /* hostkey handling */ 144 Key *get_hostkey_by_index(int); 145 Key *get_hostkey_by_type(int); 146 int get_hostkey_index(Key *); 147 int ssh1_session_key(BIGNUM *); 148 149 /* debug messages during authentication */ 150 void auth_debug_add(const char *fmt,...) __attribute__((__format__(__printf__, 1, 2))); 151 void auth_debug_send(void); 152 void auth_debug_reset(void); 153 154 struct passwd *fakepw(void); 155 156 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" 157 158 #endif 159