245 lines
8.0 KiB
C
245 lines
8.0 KiB
C
/* $OpenBSD: auth.h,v 1.96 2018/04/10 00:10:49 djm Exp $ */
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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 <signal.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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struct passwd;
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struct ssh;
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struct sshbuf;
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struct sshkey;
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struct sshauthopt;
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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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sig_atomic_t success;
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int authenticated; /* authenticated and alarms cancelled */
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int postponed; /* authentication needs another step */
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int valid; /* user exists and is allowed to login */
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int attempt;
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int failures;
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int server_caused_failure;
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int force_pwchange;
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char *user; /* username sent by the client */
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char *service;
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struct passwd *pw; /* set if 'valid' */
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char *style;
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/* Method lists for multiple authentication */
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char **auth_methods; /* modified from server config */
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u_int num_auth_methods;
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/* Authentication method-specific data */
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void *methoddata;
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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 KRB5
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krb5_context krb5_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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char *krb5_ccname;
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#endif
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struct sshbuf *loginmsg;
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/* Authentication keys already used; these will be refused henceforth */
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struct sshkey **prev_keys;
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u_int nprev_keys;
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/* Last used key and ancillary information from active auth method */
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struct sshkey *auth_method_key;
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char *auth_method_info;
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/* Information exposed to session */
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struct sshbuf *session_info; /* Auth info for environment */
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};
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/*
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* Every authentication method has to handle authentication requests for
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* non-existing users, or for users that are not allowed to login. In this
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* case 'valid' is set to 0, but 'user' points to the username requested by
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* the client.
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*/
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struct Authmethod {
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char *name;
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int (*userauth)(struct ssh *);
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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
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auth_rhosts2(struct passwd *, const char *, const char *, const char *);
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int auth_password(struct ssh *, const char *);
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int hostbased_key_allowed(struct passwd *, const char *, char *,
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struct sshkey *);
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int user_key_allowed(struct ssh *, struct passwd *, struct sshkey *, int,
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struct sshauthopt **);
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int auth2_key_already_used(Authctxt *, const struct sshkey *);
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/*
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* Handling auth method-specific information for logging and prevention
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* of key reuse during multiple authentication.
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*/
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void auth2_authctxt_reset_info(Authctxt *);
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void auth2_record_key(Authctxt *, int, const struct sshkey *);
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void auth2_record_info(Authctxt *authctxt, const char *, ...)
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__attribute__((__format__ (printf, 2, 3)))
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__attribute__((__nonnull__ (2)));
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void auth2_update_session_info(Authctxt *, const char *, const char *);
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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(Authctxt *authctxt);
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#endif /* KRB5 */
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#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
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#include <shadow.h>
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int auth_shadow_acctexpired(struct spwd *);
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int auth_shadow_pwexpired(Authctxt *);
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#endif
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#include "auth-pam.h"
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#include "audit.h"
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void remove_kbdint_device(const char *);
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void do_authentication2(Authctxt *);
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void auth_log(Authctxt *, int, int, const char *, const char *);
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void auth_maxtries_exceeded(Authctxt *) __attribute__((noreturn));
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void userauth_finish(struct ssh *, int, const char *, const char *);
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int auth_root_allowed(struct ssh *, const char *);
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void userauth_send_banner(const char *);
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char *auth2_read_banner(void);
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int auth2_methods_valid(const char *, int);
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int auth2_update_methods_lists(Authctxt *, const char *, const char *);
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int auth2_setup_methods_lists(Authctxt *);
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int auth2_method_allowed(Authctxt *, const char *, const char *);
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void privsep_challenge_enable(void);
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int auth2_challenge(struct ssh *, char *);
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void auth2_challenge_stop(struct ssh *);
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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 allowed_user(struct passwd *);
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struct passwd * getpwnamallow(const char *user);
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char *expand_authorized_keys(const char *, struct passwd *pw);
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char *authorized_principals_file(struct passwd *);
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FILE *auth_openkeyfile(const char *, struct passwd *, int);
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FILE *auth_openprincipals(const char *, struct passwd *, int);
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int auth_key_is_revoked(struct sshkey *);
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const char *auth_get_canonical_hostname(struct ssh *, int);
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HostStatus
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check_key_in_hostfiles(struct passwd *, struct sshkey *, const char *,
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const char *, const char *);
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/* hostkey handling */
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struct sshkey *get_hostkey_by_index(int);
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struct sshkey *get_hostkey_public_by_index(int, struct ssh *);
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struct sshkey *get_hostkey_public_by_type(int, int, struct ssh *);
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struct sshkey *get_hostkey_private_by_type(int, int, struct ssh *);
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int get_hostkey_index(struct sshkey *, int, struct ssh *);
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int sshd_hostkey_sign(struct sshkey *, struct sshkey *, u_char **,
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size_t *, const u_char *, size_t, const char *, u_int);
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/* Key / cert options linkage to auth layer */
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const struct sshauthopt *auth_options(struct ssh *);
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int auth_activate_options(struct ssh *, struct sshauthopt *);
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void auth_restrict_session(struct ssh *);
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int auth_authorise_keyopts(struct ssh *, struct passwd *pw,
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struct sshauthopt *, int, const char *);
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void auth_log_authopts(const char *, const struct sshauthopt *, int);
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/* debug messages during authentication */
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void auth_debug_add(const char *fmt,...)
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__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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struct passwd *fakepw(void);
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#define SSH_SUBPROCESS_STDOUT_DISCARD (1) /* Discard stdout */
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#define SSH_SUBPROCESS_STDOUT_CAPTURE (1<<1) /* Redirect stdout */
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#define SSH_SUBPROCESS_STDERR_DISCARD (1<<2) /* Discard stderr */
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pid_t subprocess(const char *, struct passwd *,
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const char *, int, char **, FILE **, u_int flags);
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int sys_auth_passwd(struct ssh *, const char *);
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#if defined(KRB5) && !defined(HEIMDAL)
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#include <krb5.h>
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krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *);
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#endif
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#endif
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