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- /*
- * Copyright (c) 2004, 2005 Darren Tucker. 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.
- */
-
- #include "includes.h"
-
- #include <stdarg.h>
- #include <string.h>
- #include <unistd.h>
-
- #ifdef SSH_AUDIT_EVENTS
-
- #include "audit.h"
- #include "log.h"
- #include "hostfile.h"
- #include "auth.h"
-
- /*
- * Care must be taken when using this since it WILL NOT be initialized when
- * audit_connection_from() is called and MAY NOT be initialized when
- * audit_event(CONNECTION_ABANDON) is called. Test for NULL before using.
- */
- extern Authctxt *the_authctxt;
-
- /* Maybe add the audit class to struct Authmethod? */
- ssh_audit_event_t
- audit_classify_auth(const char *method)
- {
- if (strcmp(method, "none") == 0)
- return SSH_AUTH_FAIL_NONE;
- else if (strcmp(method, "password") == 0)
- return SSH_AUTH_FAIL_PASSWD;
- else if (strcmp(method, "publickey") == 0 ||
- strcmp(method, "rsa") == 0)
- return SSH_AUTH_FAIL_PUBKEY;
- else if (strncmp(method, "keyboard-interactive", 20) == 0 ||
- strcmp(method, "challenge-response") == 0)
- return SSH_AUTH_FAIL_KBDINT;
- else if (strcmp(method, "hostbased") == 0 ||
- strcmp(method, "rhosts-rsa") == 0)
- return SSH_AUTH_FAIL_HOSTBASED;
- else if (strcmp(method, "gssapi-with-mic") == 0)
- return SSH_AUTH_FAIL_GSSAPI;
- else
- return SSH_AUDIT_UNKNOWN;
- }
-
- /* helper to return supplied username */
- const char *
- audit_username(void)
- {
- static const char unknownuser[] = "(unknown user)";
- static const char invaliduser[] = "(invalid user)";
-
- if (the_authctxt == NULL || the_authctxt->user == NULL)
- return (unknownuser);
- if (!the_authctxt->valid)
- return (invaliduser);
- return (the_authctxt->user);
- }
-
- const char *
- audit_event_lookup(ssh_audit_event_t ev)
- {
- int i;
- static struct event_lookup_struct {
- ssh_audit_event_t event;
- const char *name;
- } event_lookup[] = {
- {SSH_LOGIN_EXCEED_MAXTRIES, "LOGIN_EXCEED_MAXTRIES"},
- {SSH_LOGIN_ROOT_DENIED, "LOGIN_ROOT_DENIED"},
- {SSH_AUTH_SUCCESS, "AUTH_SUCCESS"},
- {SSH_AUTH_FAIL_NONE, "AUTH_FAIL_NONE"},
- {SSH_AUTH_FAIL_PASSWD, "AUTH_FAIL_PASSWD"},
- {SSH_AUTH_FAIL_KBDINT, "AUTH_FAIL_KBDINT"},
- {SSH_AUTH_FAIL_PUBKEY, "AUTH_FAIL_PUBKEY"},
- {SSH_AUTH_FAIL_HOSTBASED, "AUTH_FAIL_HOSTBASED"},
- {SSH_AUTH_FAIL_GSSAPI, "AUTH_FAIL_GSSAPI"},
- {SSH_INVALID_USER, "INVALID_USER"},
- {SSH_NOLOGIN, "NOLOGIN"},
- {SSH_CONNECTION_CLOSE, "CONNECTION_CLOSE"},
- {SSH_CONNECTION_ABANDON, "CONNECTION_ABANDON"},
- {SSH_AUDIT_UNKNOWN, "AUDIT_UNKNOWN"}
- };
-
- for (i = 0; event_lookup[i].event != SSH_AUDIT_UNKNOWN; i++)
- if (event_lookup[i].event == ev)
- break;
- return(event_lookup[i].name);
- }
-
- # ifndef CUSTOM_SSH_AUDIT_EVENTS
- /*
- * Null implementations of audit functions.
- * These get used if SSH_AUDIT_EVENTS is defined but no audit module is enabled.
- */
-
- /*
- * Called after a connection has been accepted but before any authentication
- * has been attempted.
- */
- void
- audit_connection_from(const char *host, int port)
- {
- debug("audit connection from %s port %d euid %d", host, port,
- (int)geteuid());
- }
-
- /*
- * Called when various events occur (see audit.h for a list of possible
- * events and what they mean).
- */
- void
- audit_event(struct ssh *ssh, ssh_audit_event_t event)
- {
- debug("audit event euid %d user %s event %d (%s)", geteuid(),
- audit_username(), event, audit_event_lookup(event));
- }
-
- /*
- * Called when a user session is started. Argument is the tty allocated to
- * the session, or NULL if no tty was allocated.
- *
- * Note that this may be called multiple times if multiple sessions are used
- * within a single connection.
- */
- void
- audit_session_open(struct logininfo *li)
- {
- const char *t = li->line ? li->line : "(no tty)";
-
- debug("audit session open euid %d user %s tty name %s", geteuid(),
- audit_username(), t);
- }
-
- /*
- * Called when a user session is closed. Argument is the tty allocated to
- * the session, or NULL if no tty was allocated.
- *
- * Note that this may be called multiple times if multiple sessions are used
- * within a single connection.
- */
- void
- audit_session_close(struct logininfo *li)
- {
- const char *t = li->line ? li->line : "(no tty)";
-
- debug("audit session close euid %d user %s tty name %s", geteuid(),
- audit_username(), t);
- }
-
- /*
- * This will be called when a user runs a non-interactive command. Note that
- * it may be called multiple times for a single connection since SSH2 allows
- * multiple sessions within a single connection.
- */
- void
- audit_run_command(const char *command)
- {
- debug("audit run command euid %d user %s command '%.200s'", geteuid(),
- audit_username(), command);
- }
- # endif /* !defined CUSTOM_SSH_AUDIT_EVENTS */
- #endif /* SSH_AUDIT_EVENTS */
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