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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 11:13:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 11:13:18 +0000
commit9e7e4ab6617fef1d1681fc2d3e02554264ccc954 (patch)
tree336445493163aa0370cb7830d97ebd8819b2e2c5 /auth.h
parentInitial commit. (diff)
downloadopenssh-9e7e4ab6617fef1d1681fc2d3e02554264ccc954.tar.xz
openssh-9e7e4ab6617fef1d1681fc2d3e02554264ccc954.zip
Adding upstream version 1:8.4p1.upstream/1%8.4p1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'auth.h')
-rw-r--r--auth.h240
1 files changed, 240 insertions, 0 deletions
diff --git a/auth.h b/auth.h
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+/* $OpenBSD: auth.h,v 1.100 2019/09/06 05:23:55 djm 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 <signal.h>
+
+#ifdef HAVE_LOGIN_CAP
+#include <login_cap.h>
+#endif
+#ifdef BSD_AUTH
+#include <bsd_auth.h>
+#endif
+#ifdef KRB5
+#include <krb5.h>
+#endif
+
+struct passwd;
+struct ssh;
+struct sshbuf;
+struct sshkey;
+struct sshauthopt;
+
+typedef struct Authctxt Authctxt;
+typedef struct Authmethod Authmethod;
+typedef struct KbdintDevice KbdintDevice;
+
+struct Authctxt {
+ sig_atomic_t success;
+ int authenticated; /* authenticated and alarms cancelled */
+ int postponed; /* authentication needs another step */
+ int valid; /* user exists and is allowed to login */
+ int attempt;
+ int failures;
+ int server_caused_failure;
+ int force_pwchange;
+ char *user; /* username sent by the client */
+ char *service;
+ struct passwd *pw; /* set if 'valid' */
+ char *style;
+
+ /* Method lists for multiple authentication */
+ char **auth_methods; /* modified from server config */
+ u_int num_auth_methods;
+
+ /* Authentication method-specific data */
+ void *methoddata;
+ 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
+ struct sshbuf *loginmsg;
+
+ /* Authentication keys already used; these will be refused henceforth */
+ struct sshkey **prev_keys;
+ u_int nprev_keys;
+
+ /* Last used key and ancillary information from active auth method */
+ struct sshkey *auth_method_key;
+ char *auth_method_info;
+
+ /* Information exposed to session */
+ struct sshbuf *session_info; /* Auth info for environment */
+};
+
+/*
+ * 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)(struct ssh *);
+ 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_rhosts2(struct passwd *, const char *, const char *, const char *);
+
+int auth_password(struct ssh *, const char *);
+
+int hostbased_key_allowed(struct ssh *, struct passwd *,
+ const char *, char *, struct sshkey *);
+int user_key_allowed(struct ssh *, struct passwd *, struct sshkey *, int,
+ struct sshauthopt **);
+int auth2_key_already_used(Authctxt *, const struct sshkey *);
+
+/*
+ * Handling auth method-specific information for logging and prevention
+ * of key reuse during multiple authentication.
+ */
+void auth2_authctxt_reset_info(Authctxt *);
+void auth2_record_key(Authctxt *, int, const struct sshkey *);
+void auth2_record_info(Authctxt *authctxt, const char *, ...)
+ __attribute__((__format__ (printf, 2, 3)))
+ __attribute__((__nonnull__ (2)));
+void auth2_update_session_info(Authctxt *, const char *, const char *);
+
+#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 <shadow.h>
+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 do_authentication2(struct ssh *);
+
+void auth_log(struct ssh *, int, int, const char *, const char *);
+void auth_maxtries_exceeded(struct ssh *) __attribute__((noreturn));
+void userauth_finish(struct ssh *, int, const char *, const char *);
+int auth_root_allowed(struct ssh *, const char *);
+
+char *auth2_read_banner(void);
+int auth2_methods_valid(const char *, int);
+int auth2_update_methods_lists(Authctxt *, const char *, const char *);
+int auth2_setup_methods_lists(Authctxt *);
+int auth2_method_allowed(Authctxt *, const char *, const char *);
+
+void privsep_challenge_enable(void);
+
+int auth2_challenge(struct ssh *, char *);
+void auth2_challenge_stop(struct ssh *);
+int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
+int bsdauth_respond(void *, u_int, char **);
+
+int allowed_user(struct ssh *, struct passwd *);
+struct passwd * getpwnamallow(struct ssh *, const char *user);
+
+char *expand_authorized_keys(const char *, struct passwd *pw);
+char *authorized_principals_file(struct passwd *);
+
+FILE *auth_openkeyfile(const char *, struct passwd *, int);
+FILE *auth_openprincipals(const char *, struct passwd *, int);
+int auth_key_is_revoked(struct sshkey *);
+
+const char *auth_get_canonical_hostname(struct ssh *, int);
+
+HostStatus
+check_key_in_hostfiles(struct passwd *, struct sshkey *, const char *,
+ const char *, const char *);
+
+/* hostkey handling */
+struct sshkey *get_hostkey_by_index(int);
+struct sshkey *get_hostkey_public_by_index(int, struct ssh *);
+struct sshkey *get_hostkey_public_by_type(int, int, struct ssh *);
+struct sshkey *get_hostkey_private_by_type(int, int, struct ssh *);
+int get_hostkey_index(struct sshkey *, int, struct ssh *);
+int sshd_hostkey_sign(struct ssh *, struct sshkey *, struct sshkey *,
+ u_char **, size_t *, const u_char *, size_t, const char *);
+
+/* Key / cert options linkage to auth layer */
+const struct sshauthopt *auth_options(struct ssh *);
+int auth_activate_options(struct ssh *, struct sshauthopt *);
+void auth_restrict_session(struct ssh *);
+int auth_authorise_keyopts(struct ssh *, struct passwd *pw,
+ struct sshauthopt *, int, const char *);
+void auth_log_authopts(const char *, const struct sshauthopt *, int);
+
+/* debug messages during authentication */
+void auth_debug_add(const char *fmt,...)
+ __attribute__((format(printf, 1, 2)));
+void auth_debug_send(struct ssh *);
+void auth_debug_reset(void);
+
+struct passwd *fakepw(void);
+
+#define SSH_SUBPROCESS_STDOUT_DISCARD (1) /* Discard stdout */
+#define SSH_SUBPROCESS_STDOUT_CAPTURE (1<<1) /* Redirect stdout */
+#define SSH_SUBPROCESS_STDERR_DISCARD (1<<2) /* Discard stderr */
+pid_t subprocess(const char *, struct passwd *,
+ const char *, int, char **, FILE **, u_int flags);
+
+int sys_auth_passwd(struct ssh *, const char *);
+
+#if defined(KRB5) && !defined(HEIMDAL)
+krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *);
+#endif
+
+#endif /* AUTH_H */