/* $OpenBSD: auth.h,v 1.56 2006/08/01 23:22:47 stevesk Exp $ */ /* * Copyright (c) 2000 Markus Friedl. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #ifndef AUTH_H #define AUTH_H #include #include #include #include #include #include "buffer.h" #include #ifdef HAVE_LOGIN_CAP #include #endif #ifdef BSD_AUTH #include #endif #ifdef KRB5 #include #endif #include "key.h" #include "hostfile.h" typedef struct Authctxt Authctxt; typedef struct Authmethod Authmethod; typedef struct KbdintDevice KbdintDevice; struct Authctxt { sig_atomic_t success; int postponed; /* authentication needs another step */ int valid; /* user exists and is allowed to login */ int attempt; int failures; int force_pwchange; char *user; /* username sent by the client */ char *service; struct passwd *pw; /* set if 'valid' */ char *style; void *kbdintctxt; #ifdef BSD_AUTH auth_session_t *as; #endif #ifdef KRB5 krb5_context krb5_ctx; krb5_ccache krb5_fwd_ccache; krb5_principal krb5_user; char *krb5_ticket_file; char *krb5_ccname; #endif Buffer *loginmsg; void *methoddata; }; /* * Every authentication method has to handle authentication requests for * non-existing users, or for users that are not allowed to login. In this * case 'valid' is set to 0, but 'user' points to the username requested by * the client. */ struct Authmethod { char *name; int (*userauth)(Authctxt *authctxt); int *enabled; }; /* * Keyboard interactive device: * init_ctx returns: non NULL upon success * query returns: 0 - success, otherwise failure * respond returns: 0 - success, 1 - need further interaction, * otherwise - failure */ struct KbdintDevice { const char *name; void* (*init_ctx)(Authctxt*); int (*query)(void *ctx, char **name, char **infotxt, u_int *numprompts, char ***prompts, u_int **echo_on); int (*respond)(void *ctx, u_int numresp, char **responses); void (*free_ctx)(void *ctx); }; int auth_rhosts(struct passwd *, const char *); int auth_rhosts2(struct passwd *, const char *, const char *, const char *); int auth_rhosts_rsa(Authctxt *, char *, Key *); int auth_password(Authctxt *, const char *); int auth_rsa(Authctxt *, BIGNUM *); int auth_rsa_challenge_dialog(Key *); BIGNUM *auth_rsa_generate_challenge(Key *); int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]); int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **); int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *); int hostbased_key_allowed(struct passwd *, const char *, char *, Key *); int user_key_allowed(struct passwd *, Key *); #ifdef KRB5 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *); int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt); int auth_krb5_password(Authctxt *authctxt, const char *password); void krb5_cleanup_proc(Authctxt *authctxt); #endif /* KRB5 */ #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) #include int auth_shadow_acctexpired(struct spwd *); int auth_shadow_pwexpired(Authctxt *); #endif #include "auth-pam.h" #include "audit.h" void remove_kbdint_device(const char *); void disable_forwarding(void); void do_authentication(Authctxt *); void do_authentication2(Authctxt *); void auth_log(Authctxt *, int, char *, char *); void userauth_finish(Authctxt *, int, char *); void userauth_send_banner(const char *); int auth_root_allowed(char *); char *auth2_read_banner(void); void privsep_challenge_enable(void); int auth2_challenge(Authctxt *, char *); void auth2_challenge_stop(Authctxt *); int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **); int bsdauth_respond(void *, u_int, char **); int skey_query(void *, char **, char **, u_int *, char ***, u_int **); int skey_respond(void *, u_int, char **); int allowed_user(struct passwd *); struct passwd * getpwnamallow(const char *user); char *get_challenge(Authctxt *); int verify_response(Authctxt *, const char *); void abandon_challenge_response(Authctxt *); char *authorized_keys_file(struct passwd *); char *authorized_keys_file2(struct passwd *); int secure_filename(FILE *, const char *, struct passwd *, char *, size_t); HostStatus check_key_in_hostfiles(struct passwd *, Key *, const char *, const char *, const char *); /* hostkey handling */ Key *get_hostkey_by_index(int); Key *get_hostkey_by_type(int); int get_hostkey_index(Key *); int ssh1_session_key(BIGNUM *); /* debug messages during authentication */ void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2))); void auth_debug_send(void); void auth_debug_reset(void); struct passwd *fakepw(void); int sys_auth_passwd(Authctxt *, const char *); #define AUTH_FAIL_MSG "Too many authentication failures for %.100s" #define SKEY_PROMPT "\nS/Key Password: " #if defined(KRB5) && !defined(HEIMDAL) #include krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *); #endif #endif