385 lines
13 KiB
C
385 lines
13 KiB
C
/*
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Copyright 2005 Red Hat, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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In addition, as a special exception, Red Hat, Inc. gives permission
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to link the code of this program with the OpenSSL library (or with
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modified versions of OpenSSL that use the same license as OpenSSL),
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and distribute linked combinations including the two. You must obey
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the GNU General Public License in all respects for all of the code
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used other than OpenSSL. If you modify this file, you may extend
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this exception to your version of the file, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version.
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Dr Vipul Gupta <vipul.gupta@sun.com>, Sun Microsystems Laboratories
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* $Id$ */
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/* Certificate expiry warning generation code, based on code from
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* Stronghold. Joe Orton <jorton@redhat.com> */
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/* Replaced usage of OpenSSL with NSS.
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* Elio Maldonado <emaldona@redhat.com> */
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#include <nspr.h>
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#include <nss.h>
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#include <cert.h>
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#include <certt.h>
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#include <prlong.h>
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#include <prtime.h>
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#include <pk11func.h>
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#include <assert.h>
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#include <secmod.h>
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#include <base64.h>
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#include <seccomon.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <time.h>
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#define TIME_BUF_SIZE 100
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/* Return a certificate structure from a pem-encoded cert in a file;
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* or NULL on failure. Semantics similar to the OpenSSL call
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* PEM_read_X509(fp, NULL, NULL, NULL);
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*/
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extern CERTCertificate *
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PEMUTIL_PEM_read_X509(const char *filename);
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/* size big enough for formatting time buffer */
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#define TIME_SIZE 30
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static int warn_period = 30;
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static char *warn_address = "root";
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/* Format a PRTime value into a buffer with format "%a %b %d %H:%M:%S %Y"
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* and return the buffer. The buffer returned must the freed with PORT_Free.
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* Semantics are similar to asctime.
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*/
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char * AsciiTime(PRTime time)
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{
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PRExplodedTime printable;
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char *timebuf;
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PR_ExplodeTime(time, PR_GMTParameters, &printable);
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timebuf = PORT_Alloc(TIME_BUF_SIZE);
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(void) PR_FormatTime(timebuf, TIME_BUF_SIZE, "%a %b %d %H:%M:%S %Y", &printable);
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if (strlen(timebuf) < TIME_BUF_SIZE) timebuf[strlen(timebuf)] = '\0';
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return (timebuf);
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}
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/* Uses the password passed in the -f(pwfile) argument of the command line.
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* After use once, null it out otherwise PKCS11 calls us forever.?
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*
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* Code based on SECU_GetModulePassword from the Mozilla NSS secutils
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* imternal librart.
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*/
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static char *GetModulePassword(PK11SlotInfo *slot, PRBool retry, void *arg)
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{
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int i;
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unsigned char phrase[200];
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PRFileDesc *fd;
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PRInt32 nb;
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char *pwFile = arg;
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if (!pwFile) return 0;
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if (retry) return 0; /* no good retrying - file contents will be the same */
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if (!(fd = PR_Open(pwFile, PR_RDONLY, 0))) return 0;
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nb = PR_Read(fd, phrase, sizeof(phrase));
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PR_Close(fd);
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/* handle the Windows EOL case */
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i = 0;
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while (phrase[i] != '\r' && phrase[i] != '\n' && i < nb) i++;
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phrase[i] = '\0';
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if (nb == 0) return NULL;
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return (char*) PORT_Strdup((char*)phrase);
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}
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/* Format a PRTime value into a buffer with format "%a %b %d %H:%M:%S %Y";
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* semantics are those of ctime_r(). */
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char *pr_ctime(PRTime time, char *buf, int size)
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{
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PRUint32 bytesCopied;
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PRExplodedTime et;
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PR_ExplodeTime(time, PR_GMTParameters, &et);
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bytesCopied = PR_FormatTime(buf, size, "%a %b %d %H:%M:%S %Y", &et);
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if (!bytesCopied) return NULL;
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return buf;
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}
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/* Print a warning message that the certificate in 'filename', issued
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* to hostname 'hostname', will expire (or has expired). */
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static int warning(FILE *out, const char *filename, const char *hostname,
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SECCertTimeValidity validity,
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PRTime start, PRTime end, PRTime now, int quiet)
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{
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/* Note that filename can be the cert nickname. */
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int renew = 1;
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char subj[50];
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PRTime prtimeDiff;
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LL_SUB(prtimeDiff, end, start);
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if ( LL_CMP(start, >, now) ) {
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strcpy(subj, "is not yet valid");
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renew = 0;
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} else if (LL_EQ(now, end)) {
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strcpy(subj, "will expire today");
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} else if (LL_EQ(prtimeDiff, 1)) {
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sprintf(subj, "will expire tomorrow");
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} else if (LL_CMP(prtimeDiff, <, warn_period)) {
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sprintf(subj, "will expire on %s", AsciiTime(end));
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} else {
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return 0; /* nothing to warn about. */
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}
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if (quiet) return 1;
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fprintf(out, "To: %s\n", warn_address);
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fprintf(out, "Subject: The certificate for %s %s\n", hostname, subj);
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fputs("\n", out);
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fprintf(out,
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" ################# SSL Certificate Warning ################\n\n");
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fprintf(out,
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" Certificate for hostname '%s', in file (or by nickname):\n"
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" %s\n\n",
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hostname, filename);
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if (renew) {
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fputs(" The certificate needs to be renewed; this can be done\n"
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" using the 'genkey' program.\n\n"
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" Browsers will not be able to correctly connect to this\n"
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" web site using SSL until the certificate is renewed.\n",
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out);
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} else {
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char until[TIME_SIZE];
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char *result = pr_ctime(start, until, TIME_SIZE);
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assert(result == until);
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if (strlen(until) < sizeof(until)) until[strlen(until)] = '\0';
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fprintf(out,
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" The certificate is not valid until %s.\n\n"
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" Browsers will not be able to correctly connect to this\n"
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" web site using SSL until the certificate becomes valid.\n",
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until);
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}
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fputs("\n"
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" ##########################################################\n"
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" Generated by certwatch(1)\n\n",
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out);
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return 1;
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}
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/* Extract the common name of 'cert' into 'buf'. */
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static int get_common_name(CERTCertificate *cert, char *buf, size_t bufsiz)
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{
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/* FIXME --- truncating names with spaces */
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size_t namelen;
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char *name = CERT_GetCommonName(&cert->subject);
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if (!name) return -1;
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namelen = strlen(name);
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if (bufsiz < namelen+1) return -1;
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strncpy(buf, name, namelen);
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buf[namelen] = '\0';
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PORT_Free(name);
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return 0;
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}
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/* Check whether the certificate in filename 'name' has expired;
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* issue a warning message if 'quiet' is zero. If quiet is non-zero,
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* returns one to indicate that a warning would have been issued, zero
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* to indicate no warning would be issued, or -1 if an error
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* occurred.
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*
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* When byNickname is 1 then 'name' is a nickname to search
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* for in the database otherwise it's the certificate file.
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*/
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static int check_cert(const char *name, int byNickname, int quiet)
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{
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CERTCertificate *cert;
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SECCertTimeValidity validity;
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PRTime notBefore, notAfter;
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char cname[128];
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int doWarning = 0;
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/* parse the cert */
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cert = byNickname
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? CERT_FindCertByNickname(CERT_GetDefaultCertDB(), (char *)name)
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: PEMUTIL_PEM_read_X509(name);
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if (cert == NULL) return -1;
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/* determine the validity period of the cert. */
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validity = CERT_CheckCertValidTimes(cert, PR_Now(), PR_FALSE);
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if (validity == secCertTimeUndetermined) goto cleanup;
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/* get times out of the cert */
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if (CERT_GetCertTimes(cert, ¬Before, ¬After)
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!= SECSuccess) goto cleanup;
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/* find the subject's commonName attribute */
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if (get_common_name(cert, cname, sizeof cname))
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goto cleanup;
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/* don't warn about the automatically generated certificate */
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if (strcmp(cname, "localhost") == 0 ||
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strcmp(cname, "localhost.localdomain") == 0)
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goto cleanup;
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doWarning = 1; /* ok so far, may do the warning */
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cleanup:
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if (cert) CERT_DestroyCertificate(cert);
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if (!doWarning) return -1;
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return warning(stdout, name, cname, validity,
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notBefore, notAfter, PR_Now(), quiet);
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}
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int main(int argc, char **argv)
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{
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int optc, quiet = 0;
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static const struct option options[] = {
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{ "quiet", no_argument, NULL, 'q' },
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{ "period", required_argument, NULL, 'p' },
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{ "address", required_argument, NULL, 'a' },
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{ "configdir", required_argument, NULL, 'd' },
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{ "passwordfile", required_argument, NULL, 'w' },
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{ "certdbprefix", required_argument, NULL, 'c' },
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{ "keydbprexix", required_argument, NULL, 'k' },
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{ NULL }
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};
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char *certDBPrefix = "";
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char *keyDBPrefix = "";
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char *configdir = NULL; /* contains the cert database */
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char *passwordfile = NULL; /* module password file */
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int byNickname = 0; /* whether to search by nickname */
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/* The 'timezone' global is needed to adjust local times from
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* mktime() back to UTC: */
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tzset();
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while ((optc = getopt_long(argc, argv, "qp:a:d:w:c:k:", options, NULL)) != -1) {
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switch (optc) {
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case 'q':
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quiet = 1;
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break;
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case 'p':
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warn_period = atoi(optarg);
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break;
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case 'a':
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warn_address = strdup(optarg);
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break;
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case 'd':
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configdir = strdup(optarg);
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byNickname = 1;
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break;
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case 'w':
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passwordfile = strdup(optarg);
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break;
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case 'c':
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certDBPrefix = strdup(optarg);
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break;
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case 'k':
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keyDBPrefix = strdup(optarg);
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break;
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default:
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exit(2);
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break;
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}
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}
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/* NSS initialization */
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if (byNickname) {
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/* cert in database */
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if (NSS_Initialize(configdir, certDBPrefix, keyDBPrefix,
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SECMOD_DB, NSS_INIT_READONLY) != SECSuccess) {
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return EXIT_FAILURE;
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}
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/* in case module requires a password */
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if (passwordfile) {
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PK11_SetPasswordFunc(GetModulePassword);
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}
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} else {
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/* cert in a pem file */
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char *certDir = getenv("SSL_DIR"); /* Look in $SSL_DIR */
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if (!certDir) {
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certDir = "/etc/pki/nssdb";
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}
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if (NSS_Initialize(certDir, certDBPrefix, keyDBPrefix,
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SECMOD_DB, NSS_INIT_READONLY) != SECSuccess) {
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printf("NSS_Init(\"%s\") failed\n", certDir);
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return EXIT_FAILURE;
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}
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}
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/* When byNickname is 1 argv[optind] is a nickname otherwise a filename. */
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return check_cert(argv[optind], byNickname, quiet) == 1 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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