fc0824d97d
not respond to challenge, and later successfully authenticated itself using another method, the kbdint context would never be released, leaving the PAM child process behind even after the connection ended. Fix this by automatically releasing the kbdint context if a packet of type SSH_CMSG_AUTH_TIS is follwed by anything but a packet of type SSH_CMSG_AUTH_TIS_RESPONSE. MFC after: 1 week
202 lines
5.8 KiB
C
202 lines
5.8 KiB
C
/* $OpenBSD: auth.h,v 1.41 2002/09/26 11:38:43 markus Exp $ */
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/* $FreeBSD$ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef AUTH_H
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#define AUTH_H
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#include "key.h"
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#include "hostfile.h"
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#include <openssl/rsa.h>
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#ifdef HAVE_LOGIN_CAP
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#include <login_cap.h>
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#endif
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#ifdef BSD_AUTH
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#include <bsd_auth.h>
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#endif
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#ifdef KRB5
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#include <krb5.h>
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#endif
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typedef struct Authctxt Authctxt;
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typedef struct Authmethod Authmethod;
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typedef struct KbdintDevice KbdintDevice;
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struct Authctxt {
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int success;
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int postponed;
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int valid;
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int attempt;
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int failures;
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char *user;
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char *service;
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struct passwd *pw;
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char *style;
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void *kbdintctxt;
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#ifdef BSD_AUTH
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auth_session_t *as;
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#endif
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#ifdef KRB4
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char *krb4_ticket_file;
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#endif
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#ifdef KRB5
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krb5_context krb5_ctx;
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krb5_auth_context krb5_auth_ctx;
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krb5_ccache krb5_fwd_ccache;
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krb5_principal krb5_user;
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char *krb5_ticket_file;
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#endif
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};
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struct Authmethod {
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char *name;
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int (*userauth)(Authctxt *authctxt);
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int *enabled;
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};
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/*
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* Keyboard interactive device:
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* init_ctx returns: non NULL upon success
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* query returns: 0 - success, otherwise failure
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* respond returns: 0 - success, 1 - need further interaction,
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* otherwise - failure
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*/
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struct KbdintDevice
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{
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const char *name;
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void* (*init_ctx)(Authctxt*);
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int (*query)(void *ctx, char **name, char **infotxt,
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u_int *numprompts, char ***prompts, u_int **echo_on);
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int (*respond)(void *ctx, u_int numresp, char **responses);
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void (*free_ctx)(void *ctx);
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};
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int auth_rhosts(struct passwd *, const char *);
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int
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auth_rhosts2(struct passwd *, const char *, const char *, const char *);
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int auth_rhosts_rsa(struct passwd *, char *, Key *);
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int auth_password(Authctxt *, const char *);
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int auth_rsa(struct passwd *, BIGNUM *);
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int auth_rsa_challenge_dialog(Key *);
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BIGNUM *auth_rsa_generate_challenge(Key *);
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int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
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int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
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int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
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int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
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int user_key_allowed(struct passwd *, Key *);
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#ifdef KRB4
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#include <krb.h>
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int auth_krb4(Authctxt *, KTEXT, char **, KTEXT);
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int auth_krb4_password(Authctxt *, const char *);
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void krb4_cleanup_proc(void *);
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#ifdef AFS
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#include <kafs.h>
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int auth_krb4_tgt(Authctxt *, const char *);
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int auth_afs_token(Authctxt *, const char *);
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#endif /* AFS */
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#endif /* KRB4 */
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#ifdef KRB5
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int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
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int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
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int auth_krb5_password(Authctxt *authctxt, const char *password);
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void krb5_cleanup_proc(void *authctxt);
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#endif /* KRB5 */
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#include "auth-pam.h"
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#include "auth2-pam.h"
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Authctxt *do_authentication(void);
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Authctxt *do_authentication2(void);
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Authctxt *authctxt_new(void);
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void auth_log(Authctxt *, int, char *, char *);
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void userauth_finish(Authctxt *, int, char *);
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int auth_root_allowed(char *);
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char *auth2_read_banner(void);
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void privsep_challenge_enable(void);
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int auth2_challenge(Authctxt *, char *);
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void auth2_challenge_stop(Authctxt *);
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int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
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int bsdauth_respond(void *, u_int, char **);
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int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
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int skey_respond(void *, u_int, char **);
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int allowed_user(struct passwd *);
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struct passwd * getpwnamallow(const char *user);
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char *get_challenge(Authctxt *);
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int verify_response(Authctxt *, const char *);
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void abandon_challenge_response(Authctxt *);
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struct passwd * auth_get_user(void);
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char *expand_filename(const char *, struct passwd *);
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char *authorized_keys_file(struct passwd *);
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char *authorized_keys_file2(struct passwd *);
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int
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secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
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HostStatus
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check_key_in_hostfiles(struct passwd *, Key *, const char *,
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const char *, const char *);
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/* hostkey handling */
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Key *get_hostkey_by_index(int);
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Key *get_hostkey_by_type(int);
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int get_hostkey_index(Key *);
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int ssh1_session_key(BIGNUM *);
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/* debug messages during authentication */
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void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
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void auth_debug_send(void);
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void auth_debug_reset(void);
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#define AUTH_FAIL_MAX 6
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#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
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#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
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#ifdef SKEY
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#ifdef OPIE
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#define SKEY_PROMPT "\nOPIE Password: "
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#else
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#define SKEY_PROMPT "\nS/Key Password: "
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#endif
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#endif
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#endif
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