458 lines
12 KiB
C
458 lines
12 KiB
C
/* $Id: audit-bsm.c,v 1.8 2012/02/23 23:40:43 dtucker Exp $ */
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/*
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* TODO
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*
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* - deal with overlap between this and sys_auth_allowed_user
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* sys_auth_record_login and record_failed_login.
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*/
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/*
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* Copyright 1988-2002 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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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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/* #pragma ident "@(#)bsmaudit.c 1.1 01/09/17 SMI" */
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#include "includes.h"
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#if defined(USE_BSM_AUDIT)
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#include <sys/types.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef BROKEN_BSM_API
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#include <libscf.h>
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#endif
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#include "ssh.h"
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#include "log.h"
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#include "key.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "xmalloc.h"
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#ifndef AUE_openssh
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# define AUE_openssh 32800
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#endif
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#include <bsm/audit.h>
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#include <bsm/libbsm.h>
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#include <bsm/audit_uevents.h>
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#include <bsm/audit_record.h>
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#include <locale.h>
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#if defined(HAVE_GETAUDIT_ADDR)
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#define AuditInfoStruct auditinfo_addr
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#define AuditInfoTermID au_tid_addr_t
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#define SetAuditFunc(a,b) setaudit_addr((a),(b))
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#define SetAuditFuncText "setaudit_addr"
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#define AUToSubjectFunc au_to_subject_ex
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#define AUToReturnFunc(a,b) au_to_return32((a), (int32_t)(b))
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#else
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#define AuditInfoStruct auditinfo
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#define AuditInfoTermID au_tid_t
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#define SetAuditFunc(a,b) setaudit(a)
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#define SetAuditFuncText "setaudit"
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#define AUToSubjectFunc au_to_subject
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#define AUToReturnFunc(a,b) au_to_return((a), (u_int)(b))
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#endif
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#ifndef cannot_audit
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extern int cannot_audit(int);
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#endif
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extern void aug_init(void);
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extern void aug_save_auid(au_id_t);
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extern void aug_save_uid(uid_t);
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extern void aug_save_euid(uid_t);
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extern void aug_save_gid(gid_t);
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extern void aug_save_egid(gid_t);
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extern void aug_save_pid(pid_t);
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extern void aug_save_asid(au_asid_t);
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extern void aug_save_tid(dev_t, unsigned int);
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extern void aug_save_tid_ex(dev_t, u_int32_t *, u_int32_t);
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extern int aug_save_me(void);
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extern int aug_save_namask(void);
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extern void aug_save_event(au_event_t);
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extern void aug_save_sorf(int);
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extern void aug_save_text(char *);
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extern void aug_save_text1(char *);
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extern void aug_save_text2(char *);
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extern void aug_save_na(int);
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extern void aug_save_user(char *);
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extern void aug_save_path(char *);
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extern int aug_save_policy(void);
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extern void aug_save_afunc(int (*)(int));
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extern int aug_audit(void);
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extern int aug_na_selected(void);
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extern int aug_selected(void);
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extern int aug_daemon_session(void);
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#ifndef HAVE_GETTEXT
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# define gettext(a) (a)
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#endif
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extern Authctxt *the_authctxt;
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static AuditInfoTermID ssh_bsm_tid;
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#ifdef BROKEN_BSM_API
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/* For some reason this constant is no longer defined
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in Solaris 11. */
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#define BSM_TEXTBUFSZ 256
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#endif
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/* Below is the low-level BSM interface code */
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/*
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* aug_get_machine is only required on IPv6 capable machines, we use a
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* different mechanism in audit_connection_from() for IPv4-only machines.
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* getaudit_addr() is only present on IPv6 capable machines.
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*/
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#if defined(HAVE_AUG_GET_MACHINE) || !defined(HAVE_GETAUDIT_ADDR)
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extern int aug_get_machine(char *, u_int32_t *, u_int32_t *);
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#else
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static int
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aug_get_machine(char *host, u_int32_t *addr, u_int32_t *type)
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{
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struct addrinfo *ai;
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struct sockaddr_in *in4;
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struct sockaddr_in6 *in6;
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int ret = 0, r;
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if ((r = getaddrinfo(host, NULL, NULL, &ai)) != 0) {
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error("BSM audit: getaddrinfo failed for %.100s: %.100s", host,
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r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
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return -1;
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}
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switch (ai->ai_family) {
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case AF_INET:
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in4 = (struct sockaddr_in *)ai->ai_addr;
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*type = AU_IPv4;
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memcpy(addr, &in4->sin_addr, sizeof(struct in_addr));
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break;
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#ifdef AU_IPv6
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case AF_INET6:
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in6 = (struct sockaddr_in6 *)ai->ai_addr;
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*type = AU_IPv6;
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memcpy(addr, &in6->sin6_addr, sizeof(struct in6_addr));
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break;
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#endif
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default:
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error("BSM audit: unknown address family for %.100s: %d",
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host, ai->ai_family);
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ret = -1;
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}
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freeaddrinfo(ai);
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return ret;
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}
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#endif
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#ifdef BROKEN_BSM_API
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/*
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In Solaris 11 the audit daemon has been moved to SMF. In the process
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they simply dropped getacna() from the API, since it read from a now
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non-existent config file. This function re-implements getacna() to
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read from the SMF repository instead.
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*/
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int
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getacna(char *auditstring, int len)
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{
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scf_handle_t *handle = NULL;
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scf_property_t *property = NULL;
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scf_value_t *value = NULL;
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int ret = 0;
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handle = scf_handle_create(SCF_VERSION);
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if (handle == NULL)
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return -2; /* The man page for getacna on Solaris 10 states
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we should return -2 in case of error and set
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errno to indicate the error. We don't bother
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with errno here, though, since the only use
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of this function below doesn't check for errors
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anyway.
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*/
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ret = scf_handle_bind(handle);
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if (ret == -1)
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return -2;
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property = scf_property_create(handle);
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if (property == NULL)
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return -2;
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ret = scf_handle_decode_fmri(handle,
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"svc:/system/auditd:default/:properties/preselection/naflags",
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NULL, NULL, NULL, NULL, property, 0);
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if (ret == -1)
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return -2;
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value = scf_value_create(handle);
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if (value == NULL)
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return -2;
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ret = scf_property_get_value(property, value);
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if (ret == -1)
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return -2;
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ret = scf_value_get_astring(value, auditstring, len);
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if (ret == -1)
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return -2;
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scf_value_destroy(value);
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scf_property_destroy(property);
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scf_handle_destroy(handle);
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return 0;
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}
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#endif
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/*
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* Check if the specified event is selected (enabled) for auditing.
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* Returns 1 if the event is selected, 0 if not and -1 on failure.
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*/
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static int
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selected(char *username, uid_t uid, au_event_t event, int sf)
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{
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int rc, sorf;
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char naflags[512];
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struct au_mask mask;
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mask.am_success = mask.am_failure = 0;
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if (uid < 0) {
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/* get flags for non-attributable (to a real user) events */
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rc = getacna(naflags, sizeof(naflags));
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if (rc == 0)
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(void) getauditflagsbin(naflags, &mask);
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} else
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rc = au_user_mask(username, &mask);
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sorf = (sf == 0) ? AU_PRS_SUCCESS : AU_PRS_FAILURE;
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return(au_preselect(event, &mask, sorf, AU_PRS_REREAD));
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}
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static void
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bsm_audit_record(int typ, char *string, au_event_t event_no)
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{
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int ad, rc, sel;
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uid_t uid = -1;
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gid_t gid = -1;
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pid_t pid = getpid();
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AuditInfoTermID tid = ssh_bsm_tid;
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if (the_authctxt != NULL && the_authctxt->valid) {
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uid = the_authctxt->pw->pw_uid;
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gid = the_authctxt->pw->pw_gid;
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}
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rc = (typ == 0) ? 0 : -1;
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sel = selected(the_authctxt->user, uid, event_no, rc);
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debug3("BSM audit: typ %d rc %d \"%s\"", typ, rc, string);
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if (!sel)
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return; /* audit event does not match mask, do not write */
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debug3("BSM audit: writing audit new record");
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ad = au_open();
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(void) au_write(ad, AUToSubjectFunc(uid, uid, gid, uid, gid,
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pid, pid, &tid));
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(void) au_write(ad, au_to_text(string));
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(void) au_write(ad, AUToReturnFunc(typ, rc));
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#ifdef BROKEN_BSM_API
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/* The last argument is the event modifier flags. For
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some seemingly undocumented reason it was added in
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Solaris 11. */
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rc = au_close(ad, AU_TO_WRITE, event_no, 0);
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#else
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rc = au_close(ad, AU_TO_WRITE, event_no);
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#endif
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if (rc < 0)
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error("BSM audit: %s failed to write \"%s\" record: %s",
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__func__, string, strerror(errno));
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}
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static void
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bsm_audit_session_setup(void)
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{
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int rc;
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struct AuditInfoStruct info;
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au_mask_t mask;
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if (the_authctxt == NULL) {
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error("BSM audit: session setup internal error (NULL ctxt)");
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return;
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}
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if (the_authctxt->valid)
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info.ai_auid = the_authctxt->pw->pw_uid;
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else
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info.ai_auid = -1;
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info.ai_asid = getpid();
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mask.am_success = 0;
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mask.am_failure = 0;
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(void) au_user_mask(the_authctxt->user, &mask);
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info.ai_mask.am_success = mask.am_success;
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info.ai_mask.am_failure = mask.am_failure;
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info.ai_termid = ssh_bsm_tid;
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rc = SetAuditFunc(&info, sizeof(info));
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if (rc < 0)
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error("BSM audit: %s: %s failed: %s", __func__,
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SetAuditFuncText, strerror(errno));
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}
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static void
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bsm_audit_bad_login(const char *what)
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{
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char textbuf[BSM_TEXTBUFSZ];
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if (the_authctxt->valid) {
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(void) snprintf(textbuf, sizeof (textbuf),
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gettext("invalid %s for user %s"),
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what, the_authctxt->user);
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bsm_audit_record(4, textbuf, AUE_openssh);
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} else {
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(void) snprintf(textbuf, sizeof (textbuf),
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gettext("invalid user name \"%s\""),
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the_authctxt->user);
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bsm_audit_record(3, textbuf, AUE_openssh);
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}
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}
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/* Below is the sshd audit API code */
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void
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audit_connection_from(const char *host, int port)
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{
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AuditInfoTermID *tid = &ssh_bsm_tid;
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char buf[1024];
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if (cannot_audit(0))
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return;
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debug3("BSM audit: connection from %.100s port %d", host, port);
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/* populate our terminal id structure */
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#if defined(HAVE_GETAUDIT_ADDR)
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tid->at_port = (dev_t)port;
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aug_get_machine((char *)host, &(tid->at_addr[0]), &(tid->at_type));
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snprintf(buf, sizeof(buf), "%08x %08x %08x %08x", tid->at_addr[0],
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tid->at_addr[1], tid->at_addr[2], tid->at_addr[3]);
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debug3("BSM audit: iptype %d machine ID %s", (int)tid->at_type, buf);
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#else
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/* this is used on IPv4-only machines */
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tid->port = (dev_t)port;
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tid->machine = inet_addr(host);
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snprintf(buf, sizeof(buf), "%08x", tid->machine);
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debug3("BSM audit: machine ID %s", buf);
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#endif
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}
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void
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audit_run_command(const char *command)
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{
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/* not implemented */
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}
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void
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audit_session_open(struct logininfo *li)
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{
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/* not implemented */
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}
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void
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audit_session_close(struct logininfo *li)
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{
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/* not implemented */
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}
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void
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audit_event(ssh_audit_event_t event)
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{
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char textbuf[BSM_TEXTBUFSZ];
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static int logged_in = 0;
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const char *user = the_authctxt ? the_authctxt->user : "(unknown user)";
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if (cannot_audit(0))
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return;
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switch(event) {
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case SSH_AUTH_SUCCESS:
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logged_in = 1;
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bsm_audit_session_setup();
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snprintf(textbuf, sizeof(textbuf),
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gettext("successful login %s"), user);
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bsm_audit_record(0, textbuf, AUE_openssh);
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break;
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case SSH_CONNECTION_CLOSE:
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/*
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* We can also get a close event if the user attempted auth
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* but never succeeded.
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*/
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if (logged_in) {
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snprintf(textbuf, sizeof(textbuf),
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gettext("sshd logout %s"), the_authctxt->user);
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bsm_audit_record(0, textbuf, AUE_logout);
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} else {
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debug("%s: connection closed without authentication",
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__func__);
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}
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break;
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case SSH_NOLOGIN:
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bsm_audit_record(1,
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gettext("logins disabled by /etc/nologin"), AUE_openssh);
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break;
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case SSH_LOGIN_EXCEED_MAXTRIES:
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snprintf(textbuf, sizeof(textbuf),
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gettext("too many tries for user %s"), the_authctxt->user);
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bsm_audit_record(1, textbuf, AUE_openssh);
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break;
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case SSH_LOGIN_ROOT_DENIED:
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bsm_audit_record(2, gettext("not_console"), AUE_openssh);
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break;
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case SSH_AUTH_FAIL_PASSWD:
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bsm_audit_bad_login("password");
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break;
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case SSH_AUTH_FAIL_KBDINT:
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bsm_audit_bad_login("interactive password entry");
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break;
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default:
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debug("%s: unhandled event %d", __func__, event);
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}
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}
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#endif /* BSM */
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