mirror of git://anongit.mindrot.org/openssh.git
473 lines
12 KiB
C
473 lines
12 KiB
C
/*
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*
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* Copyright (c) 2001 Gert Doering. All rights reserved.
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* Copyright (c) 2003,2004,2005,2006 Darren Tucker. 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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#include "includes.h"
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#include "xmalloc.h"
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#include "buffer.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 "ssh.h"
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#include "log.h"
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#ifdef _AIX
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#include <errno.h>
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#if defined(HAVE_NETDB_H)
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# include <netdb.h>
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#endif
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#include <uinfo.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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#include <sys/socket.h>
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#ifdef WITH_AIXAUTHENTICATE
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# include <login.h>
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# include <userpw.h>
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# if defined(HAVE_SYS_AUDIT_H) && defined(AIX_LOGINFAILED_4ARG)
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# include <sys/audit.h>
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# endif
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# include <usersec.h>
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#endif
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#include "port-aix.h"
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static char *lastlogin_msg = NULL;
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# ifdef HAVE_SETAUTHDB
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static char old_registry[REGISTRY_SIZE] = "";
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# endif
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/*
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* AIX has a "usrinfo" area where logname and other stuff is stored -
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* a few applications actually use this and die if it's not set
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*
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* NOTE: TTY= should be set, but since no one uses it and it's hard to
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* acquire due to privsep code. We will just drop support.
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*/
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void
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aix_usrinfo(struct passwd *pw)
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{
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u_int i;
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size_t len;
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char *cp;
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len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name));
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cp = xmalloc(len);
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i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0',
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pw->pw_name, '\0');
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if (usrinfo(SETUINFO, cp, i) == -1)
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fatal("Couldn't set usrinfo: %s", strerror(errno));
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debug3("AIX/UsrInfo: set len %d", i);
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free(cp);
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}
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# ifdef WITH_AIXAUTHENTICATE
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/*
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* Remove embedded newlines in string (if any).
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* Used before logging messages returned by AIX authentication functions
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* so the message is logged on one line.
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*/
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void
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aix_remove_embedded_newlines(char *p)
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{
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if (p == NULL)
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return;
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for (; *p; p++) {
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if (*p == '\n')
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*p = ' ';
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}
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/* Remove trailing whitespace */
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if (*--p == ' ')
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*p = '\0';
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}
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/*
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* Test specifically for the case where SYSTEM == NONE and AUTH1 contains
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* anything other than NONE or SYSTEM, which indicates that the admin has
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* configured the account for purely AUTH1-type authentication.
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*
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* Since authenticate() doesn't check AUTH1, and sshd can't sanely support
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* AUTH1 itself, in such a case authenticate() will allow access without
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* authentation, which is almost certainly not what the admin intends.
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*
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* (The native tools, eg login, will process the AUTH1 list in addition to
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* the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods
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* have been deprecated since AIX 4.2.x and would be very difficult for sshd
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* to support.
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*
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* Returns 0 if an unsupportable combination is found, 1 otherwise.
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*/
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static int
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aix_valid_authentications(const char *user)
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{
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char *auth1, *sys, *p;
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int valid = 1;
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if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) {
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logit("Can't retrieve attribute SYSTEM for %s: %.100s",
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user, strerror(errno));
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return 0;
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}
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debug3("AIX SYSTEM attribute %s", sys);
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if (strcmp(sys, "NONE") != 0)
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return 1; /* not "NONE", so is OK */
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if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) {
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logit("Can't retrieve attribute auth1 for %s: %.100s",
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user, strerror(errno));
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return 0;
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}
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p = auth1;
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/* A SEC_LIST is concatenated strings, ending with two NULs. */
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while (p[0] != '\0' && p[1] != '\0') {
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debug3("AIX auth1 attribute list member %s", p);
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if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) {
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logit("Account %s has unsupported auth1 value '%s'",
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user, p);
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valid = 0;
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}
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p += strlen(p) + 1;
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}
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return (valid);
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}
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/*
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* Do authentication via AIX's authenticate routine. We loop until the
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* reenter parameter is 0, but normally authenticate is called only once.
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*
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* Note: this function returns 1 on success, whereas AIX's authenticate()
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* returns 0.
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*/
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int
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sys_auth_passwd(Authctxt *ctxt, const char *password)
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{
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char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name;
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int authsuccess = 0, expired, reenter, result;
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do {
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result = authenticate((char *)name, (char *)password, &reenter,
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&authmsg);
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aix_remove_embedded_newlines(authmsg);
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debug3("AIX/authenticate result %d, authmsg %.100s", result,
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authmsg);
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} while (reenter);
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if (!aix_valid_authentications(name))
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result = -1;
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if (result == 0) {
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authsuccess = 1;
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/*
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* Record successful login. We don't have a pty yet, so just
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* label the line as "ssh"
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*/
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aix_setauthdb(name);
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/*
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* Check if the user's password is expired.
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*/
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expired = passwdexpired(name, &msg);
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if (msg && *msg) {
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buffer_append(ctxt->loginmsg, msg, strlen(msg));
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aix_remove_embedded_newlines(msg);
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}
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debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg);
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switch (expired) {
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case 0: /* password not expired */
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break;
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case 1: /* expired, password change required */
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ctxt->force_pwchange = 1;
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break;
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default: /* user can't change(2) or other error (-1) */
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logit("Password can't be changed for user %s: %.100s",
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name, msg);
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free(msg);
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authsuccess = 0;
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}
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aix_restoreauthdb();
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}
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free(authmsg);
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return authsuccess;
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}
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/*
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* Check if specified account is permitted to log in.
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* Returns 1 if login is allowed, 0 if not allowed.
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*/
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int
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sys_auth_allowed_user(struct passwd *pw, Buffer *loginmsg)
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{
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char *msg = NULL;
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int result, permitted = 0;
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struct stat st;
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/*
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* Don't perform checks for root account (PermitRootLogin controls
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* logins via ssh) or if running as non-root user (since
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* loginrestrictions will always fail due to insufficient privilege).
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*/
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if (pw->pw_uid == 0 || geteuid() != 0) {
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debug3("%s: not checking", __func__);
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return 1;
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}
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result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg);
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if (result == 0)
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permitted = 1;
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/*
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* If restricted because /etc/nologin exists, the login will be denied
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* in session.c after the nologin message is sent, so allow for now
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* and do not append the returned message.
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*/
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if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0)
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permitted = 1;
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else if (msg != NULL)
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buffer_append(loginmsg, msg, strlen(msg));
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if (msg == NULL)
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msg = xstrdup("(none)");
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aix_remove_embedded_newlines(msg);
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debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg);
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if (!permitted)
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logit("Login restricted for %s: %.100s", pw->pw_name, msg);
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free(msg);
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return permitted;
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}
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int
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sys_auth_record_login(const char *user, const char *host, const char *ttynm,
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Buffer *loginmsg)
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{
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char *msg = NULL;
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int success = 0;
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aix_setauthdb(user);
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if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
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success = 1;
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if (msg != NULL) {
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debug("AIX/loginsuccess: msg %s", msg);
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if (lastlogin_msg == NULL)
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lastlogin_msg = msg;
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}
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}
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aix_restoreauthdb();
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return (success);
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}
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char *
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sys_auth_get_lastlogin_msg(const char *user, uid_t uid)
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{
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char *msg = lastlogin_msg;
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lastlogin_msg = NULL;
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return msg;
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}
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# ifdef CUSTOM_FAILED_LOGIN
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/*
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* record_failed_login: generic "login failed" interface function
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*/
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void
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record_failed_login(const char *user, const char *hostname, const char *ttyname)
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{
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if (geteuid() != 0)
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return;
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aix_setauthdb(user);
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# ifdef AIX_LOGINFAILED_4ARG
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loginfailed((char *)user, (char *)hostname, (char *)ttyname,
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AUDIT_FAIL_AUTH);
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# else
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loginfailed((char *)user, (char *)hostname, (char *)ttyname);
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# endif
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aix_restoreauthdb();
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}
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# endif /* CUSTOM_FAILED_LOGIN */
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/*
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* If we have setauthdb, retrieve the password registry for the user's
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* account then feed it to setauthdb. This will mean that subsequent AIX auth
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* functions will only use the specified loadable module. If we don't have
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* setauthdb this is a no-op.
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*/
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void
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aix_setauthdb(const char *user)
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{
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# ifdef HAVE_SETAUTHDB
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char *registry;
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if (setuserdb(S_READ) == -1) {
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debug3("%s: Could not open userdb to read", __func__);
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return;
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}
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if (getuserattr((char *)user, S_REGISTRY, ®istry, SEC_CHAR) == 0) {
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if (setauthdb(registry, old_registry) == 0)
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debug3("AIX/setauthdb set registry '%s'", registry);
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else
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debug3("AIX/setauthdb set registry '%s' failed: %s",
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registry, strerror(errno));
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} else
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debug3("%s: Could not read S_REGISTRY for user: %s", __func__,
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strerror(errno));
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enduserdb();
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# endif /* HAVE_SETAUTHDB */
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}
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/*
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* Restore the user's registry settings from old_registry.
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* Note that if the first aix_setauthdb fails, setauthdb("") is still safe
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* (it restores the system default behaviour). If we don't have setauthdb,
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* this is a no-op.
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*/
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void
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aix_restoreauthdb(void)
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{
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# ifdef HAVE_SETAUTHDB
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if (setauthdb(old_registry, NULL) == 0)
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debug3("%s: restoring old registry '%s'", __func__,
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old_registry);
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else
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debug3("%s: failed to restore old registry %s", __func__,
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old_registry);
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# endif /* HAVE_SETAUTHDB */
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}
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# endif /* WITH_AIXAUTHENTICATE */
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# ifdef USE_AIX_KRB_NAME
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/*
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* aix_krb5_get_principal_name: returns the user's kerberos client principal name if
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* configured, otherwise NULL. Caller must free returned string.
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*/
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char *
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aix_krb5_get_principal_name(char *pw_name)
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{
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char *authname = NULL, *authdomain = NULL, *principal = NULL;
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setuserdb(S_READ);
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if (getuserattr(pw_name, S_AUTHDOMAIN, &authdomain, SEC_CHAR) != 0)
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debug("AIX getuserattr S_AUTHDOMAIN: %s", strerror(errno));
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if (getuserattr(pw_name, S_AUTHNAME, &authname, SEC_CHAR) != 0)
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debug("AIX getuserattr S_AUTHNAME: %s", strerror(errno));
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if (authdomain != NULL)
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xasprintf(&principal, "%s@%s", authname ? authname : pw_name, authdomain);
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else if (authname != NULL)
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principal = xstrdup(authname);
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enduserdb();
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return principal;
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}
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# endif /* USE_AIX_KRB_NAME */
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# if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO)
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# undef getnameinfo
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/*
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* For some reason, AIX's getnameinfo will refuse to resolve the all-zeros
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* IPv6 address into its textual representation ("::"), so we wrap it
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* with a function that will.
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*/
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int
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sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
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size_t hostlen, char *serv, size_t servlen, int flags)
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{
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struct sockaddr_in6 *sa6;
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u_int32_t *a6;
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if (flags & (NI_NUMERICHOST|NI_NUMERICSERV) &&
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sa->sa_family == AF_INET6) {
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sa6 = (struct sockaddr_in6 *)sa;
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a6 = sa6->sin6_addr.u6_addr.u6_addr32;
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if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) {
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strlcpy(host, "::", hostlen);
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snprintf(serv, servlen, "%d", sa6->sin6_port);
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return 0;
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}
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}
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return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
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}
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# endif /* AIX_GETNAMEINFO_HACK */
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# if defined(USE_GETGRSET)
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# include <stdlib.h>
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int
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getgrouplist(const char *user, gid_t pgid, gid_t *groups, int *grpcnt)
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{
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char *cp, *grplist, *grp;
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gid_t gid;
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int ret = 0, ngroups = 0, maxgroups;
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long l;
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maxgroups = *grpcnt;
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if ((cp = grplist = getgrset(user)) == NULL)
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return -1;
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/* handle zero-length case */
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if (maxgroups <= 0) {
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*grpcnt = 0;
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return -1;
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}
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/* copy primary group */
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groups[ngroups++] = pgid;
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/* copy each entry from getgrset into group list */
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while ((grp = strsep(&grplist, ",")) != NULL) {
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l = strtol(grp, NULL, 10);
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if (ngroups >= maxgroups || l == LONG_MIN || l == LONG_MAX) {
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ret = -1;
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goto out;
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}
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gid = (gid_t)l;
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if (gid == pgid)
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continue; /* we have already added primary gid */
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groups[ngroups++] = gid;
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}
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out:
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free(cp);
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*grpcnt = ngroups;
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return ret;
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}
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# endif /* USE_GETGRSET */
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#endif /* _AIX */
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