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//krazy:excludeall=license (program, not a library)
/*
** cert_extract.c -- Extract CA Certs out of Netscape certN.db files
**
** Copyright Ariel Glenn <ariel@columbia.edu>
** Copyright 1998 Ralf S. Engelschall <rse@engelschall.com>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
**
**
** Originally written and released under the GPL by
** Ariel Glenn from the AcIS R&D group at Columbia
** as the two sources findoffset.c and dblist.c. See under
** http://www.columbia.edu/~ariel/good-certs/ for more details.
**
** Merged into one single program in August 1998
** by Ralf S. Engelschall for use in the mod_ssl project.
** See under http://www.engelschall.com/sw/mod_ssl/ for more details.
**
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <db1/db.h>
#include "openssl/asn1.h"
#include "openssl/x509.h"
int findoffset(char *dbname);
int findoffset(char *dbname)
{
DB *db;
DBT dkey, dvalue;
int result;
int offset = 0;
char *p;
int ptag = 0, pclass, plen;
X509 *mycert;
if ((db = dbopen(dbname, O_RDONLY, 0, DB_HASH, NULL)) == NULL) {
fprintf(stderr, "Failed to open DB file '%s': %s\n", dbname, strerror(errno));
exit(1);
}
while ((result = (db->seq(db, &dkey, &dvalue, R_NEXT))) == 0) {
if ((dvalue.size) > 520) {
while (offset < dvalue.size) {
p = (char *)dvalue.data + offset - 1;
ASN1_get_object((unsigned char **)&p, (long *)&plen, &ptag, &pclass, dvalue.size);
if (ptag == V_ASN1_SEQUENCE) { /* ok, it might be a cert then. */
/* include length of object header junk */
plen += p - ((char *) dvalue.data + offset - 1);
mycert = NULL;
p = (char *) dvalue.data + offset - 1;
d2i_X509(&mycert, (unsigned char **) &p, plen);
if (mycert == NULL) { /* must be garbage after all */
offset++;
continue;
}
break;
}
else
offset++;
}
if (offset > 0)
break; /* found it, let's quit */
}
}
db->close(db);
return (offset);
}
int main(int argc, char **argv)
{
char *dbname;
DB *db;
int j;
int offset;
DBT dkey, dvalue;
int result;
char oname[40];
int fout;
int find;
char *p;
int ptag = 0, pclass, plen;
X509 *mycert;
char *shortname;
char byte1, byte2;
if (argc != 2) {
fprintf(stderr, "usage: %s /path/to/netscape/cert.db\n", argv[0]);
exit(1);
}
dbname = argv[1];
offset = findoffset(dbname);
if (offset == 0) {
fprintf(stderr, "Could not determine cert offset in DB file '%s'\n", dbname);
exit(1);
}
else {
fprintf(stderr, "Ok: certificates are at offset %d\n", offset);
}
if ((db = dbopen(dbname, O_RDONLY, 0, DB_HASH, NULL)) == NULL) {
fprintf(stderr, "Failed to open DB file '%s': %s\n", dbname, strerror(errno));
exit(1);
}
if ((find = open("cert.index", O_WRONLY | O_CREAT | O_TRUNC, 0755)) == -1) {
fprintf(stderr, "Failed to open Index file '%s': %s\n", "cert-index", strerror(errno));
exit(1);
}
j = 0;
byte1 = -1;
byte2 = -1;
while ((result = (db->seq(db, &dkey, &dvalue, R_NEXT))) == 0) {
if (dvalue.size > offset && ((dvalue.size) - offset) > 500) {
p = (char *)dvalue.data + offset - 1;
if (byte1 != -1 && byte2 != -1)
if (byte1 != p[0] || byte2 != p[1])
continue;
ASN1_get_object((unsigned char **)&p, (long *)&plen, &ptag, &pclass, dvalue.size);
if (ptag == V_ASN1_SEQUENCE) { /* ok, it might be a cert then. */
if (byte1 == -1 && byte2 == -1) {
byte1 = p[0];
byte2 = p[1];
}
/* include length of object header junk */
plen += p - ((char *) dvalue.data + offset - 1);
mycert = NULL;
p = (char *) dvalue.data + offset - 1;
d2i_X509(&mycert, (unsigned char **) &p, plen);
if (mycert == NULL) { /* must be garbage after all */
continue;
}
j++;
sprintf(oname, "cert.%02d.der", j);
if ((fout = open(oname, O_WRONLY | O_CREAT | O_TRUNC, 0755)) == -1) {
fprintf(stderr, "could not open %s\n", oname);
continue;
}
write(fout, (char *) dvalue.data + offset - 1, plen);
close(fout);
write(find, oname, strlen(oname));
write(find, ": ", 2);
shortname = (char *) dvalue.data + offset - 1 + plen;
write(find, shortname, dvalue.size - plen - offset);
write(find, "\n", 1);
fprintf(stderr, "Extracted: %s (", oname);
write(fileno(stderr), shortname, dvalue.size - plen - offset);
fprintf(stderr, ")\n");
}
else {
/* fprintf(stderr, "Hmmm... ptag is %d, plen is %d\n", ptag, plen); */
}
}
}
close(find);
db->close(db);
return (0);
}
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