1: /* $NetBSD: plainrsa-gen.c,v 1.6 2011/02/11 10:07:19 tteras Exp $ */
2:
3: /* Id: plainrsa-gen.c,v 1.6 2005/04/21 09:08:40 monas Exp */
4: /*
5: * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
6: * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
7: * All rights reserved.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: * 3. Neither the name of the project nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: */
33:
34: /* This file contains a generator for FreeS/WAN-style ipsec.secrets RSA keys. */
35:
36: #include "config.h"
37:
38: #include <stdio.h>
39: #include <string.h>
40: #include <errno.h>
41:
42: #include <sys/types.h>
43: #include <sys/stat.h>
44: #include <sys/socket.h>
45: #include <unistd.h>
46: #include <fcntl.h>
47:
48: #include <openssl/bio.h>
49: #include <openssl/bn.h>
50: #include <openssl/err.h>
51: #include <openssl/objects.h>
52: #include <openssl/pem.h>
53: #include <openssl/rsa.h>
54: #include <openssl/evp.h>
55: #ifdef HAVE_OPENSSL_ENGINE_H
56: #include <openssl/engine.h>
57: #endif
58:
59: #include "misc.h"
60: #include "vmbuf.h"
61: #include "plog.h"
62: #include "crypto_openssl.h"
63:
64: #include "package_version.h"
65:
66: void
67: usage (char *argv0)
68: {
69: fprintf(stderr, "Plain RSA key generator, part of %s\n", TOP_PACKAGE_STRING);
70: fprintf(stderr, "By Michal Ludvig (http://www.logix.cz/michal)\n");
71: fprintf(stderr, "\n");
72: fprintf(stderr, "Usage: %s [options]\n", argv0);
73: fprintf(stderr, "\n");
74: fprintf(stderr, " -b bits Generate <bits> long RSA key (default=1024)\n");
75: fprintf(stderr, " -e pubexp Public exponent to use (default=0x3)\n");
76: fprintf(stderr, " -f filename Filename to store the key to (default=stdout)\n");
77: fprintf(stderr, " -i filename Input source for format conversion\n");
78: fprintf(stderr, " -h Help\n");
79: fprintf(stderr, "\n");
80: fprintf(stderr, "Report bugs to <ipsec-tools-devel@lists.sourceforge.net>\n");
81: exit(1);
82: }
83:
84: /*
85: * See RFC 2065, section 3.5 for details about the output format.
86: */
87: vchar_t *
88: mix_b64_pubkey(const RSA *key)
89: {
90: char *binbuf;
91: long binlen, ret;
92: vchar_t *res;
93:
94: binlen = 1 + BN_num_bytes(key->e) + BN_num_bytes(key->n);
95: binbuf = malloc(binlen);
96: memset(binbuf, 0, binlen);
97: binbuf[0] = BN_bn2bin(key->e, (unsigned char *) &binbuf[1]);
98: ret = BN_bn2bin(key->n, (unsigned char *) (&binbuf[binbuf[0] + 1]));
99: if (1 + binbuf[0] + ret != binlen) {
100: plog(LLV_ERROR, LOCATION, NULL,
101: "Pubkey generation failed. This is really strange...\n");
102: return NULL;
103: }
104:
105: return base64_encode(binbuf, binlen);
106: }
107:
108: char *
109: lowercase(char *input)
110: {
111: char *ptr = input;
112: while (*ptr) {
113: if (*ptr >= 'A' && *ptr <= 'F')
114: *ptr -= 'A' - 'a';
115: *ptr++;
116: }
117:
118: return input;
119: }
120:
121: int
122: print_rsa_key(FILE *fp, const RSA *key)
123: {
124: vchar_t *pubkey64 = NULL;
125:
126: pubkey64 = mix_b64_pubkey(key);
127: if (!pubkey64) {
128: fprintf(stderr, "mix_b64_pubkey(): %s\n", eay_strerror());
129: return -1;
130: }
131:
132: fprintf(fp, "# : PUB 0s%s\n", pubkey64->v);
133: fprintf(fp, ": RSA\t{\n");
134: fprintf(fp, "\t# RSA %d bits\n", BN_num_bits(key->n));
135: fprintf(fp, "\t# pubkey=0s%s\n", pubkey64->v);
136: fprintf(fp, "\tModulus: 0x%s\n", lowercase(BN_bn2hex(key->n)));
137: fprintf(fp, "\tPublicExponent: 0x%s\n", lowercase(BN_bn2hex(key->e)));
138: fprintf(fp, "\tPrivateExponent: 0x%s\n", lowercase(BN_bn2hex(key->d)));
139: fprintf(fp, "\tPrime1: 0x%s\n", lowercase(BN_bn2hex(key->p)));
140: fprintf(fp, "\tPrime2: 0x%s\n", lowercase(BN_bn2hex(key->q)));
141: fprintf(fp, "\tExponent1: 0x%s\n", lowercase(BN_bn2hex(key->dmp1)));
142: fprintf(fp, "\tExponent2: 0x%s\n", lowercase(BN_bn2hex(key->dmq1)));
143: fprintf(fp, "\tCoefficient: 0x%s\n", lowercase(BN_bn2hex(key->iqmp)));
144: fprintf(fp, " }\n");
145:
146: vfree(pubkey64);
147: return 0;
148: }
149:
150: int
151: print_public_rsa_key(FILE *fp, const RSA *key)
152: {
153: vchar_t *pubkey64 = NULL;
154:
155: pubkey64 = mix_b64_pubkey(key);
156: if (!pubkey64) {
157: fprintf(stderr, "mix_b64_pubkey(): %s\n", eay_strerror());
158: return -1;
159: }
160:
161: fprintf(fp, ": PUB 0s%s\n", pubkey64->v);
162:
163: vfree(pubkey64);
164: return 0;
165: }
166:
167: int
168: convert_rsa_key(FILE *fpout, FILE *fpin)
169: {
170: int ret;
171: RSA *key = NULL;
172:
173: key = PEM_read_RSAPrivateKey(fpin, NULL, NULL, NULL);
174: if (key) {
175: ret = print_rsa_key(fpout, key);
176: RSA_free(key);
177:
178: return ret;
179: }
180:
181: rewind(fpin);
182:
183: key = PEM_read_RSA_PUBKEY(fpin, NULL, NULL, NULL);
184: if (key) {
185: ret = print_public_rsa_key(fpout, key);
186: RSA_free(key);
187:
188: return ret;
189: }
190:
191: /* Implement parsing of input stream containing
192: * private or public "plainrsa" formatted text.
193: * Convert the result to PEM formatted output.
194: *
195: * This seemingly needs manual use of prsaparse().
196: * An expert ought to do this. */
197:
198: fprintf(stderr, "convert_rsa_key: %s\n", "Only conversion from PEM at this time");
199: return -1;
200: }
201:
202: int
203: gen_rsa_key(FILE *fp, size_t bits, unsigned long exp)
204: {
205: int ret;
206: RSA *key;
207:
208: key = RSA_generate_key(bits, exp, NULL, NULL);
209: if (!key) {
210: fprintf(stderr, "RSA_generate_key(): %s\n", eay_strerror());
211: return -1;
212: }
213:
214: ret = print_rsa_key(fp, key);
215: RSA_free(key);
216:
217: return ret;
218: }
219:
220: int
221: main (int argc, char *argv[])
222: {
223: FILE *fp = stdout, *fpin = NULL;
224: size_t bits = 1024;
225: unsigned int pubexp = 0x3;
226: struct stat st;
227: extern char *optarg;
228: extern int optind;
229: int c, fd = -1, fdin = -1;
230: char *fname = NULL, *finput = NULL;
231:
232: while ((c = getopt(argc, argv, "e:b:f:i:h")) != -1)
233: switch (c) {
234: case 'e':
235: if (strncmp(optarg, "0x", 2) == 0)
236: sscanf(optarg, "0x%x", &pubexp);
237: else
238: pubexp = atoi(optarg);
239: break;
240: case 'b':
241: bits = atoi(optarg);
242: break;
243: case 'f':
244: fname = optarg;
245: break;
246: case 'i':
247: finput = optarg;
248: break;
249: case 'h':
250: default:
251: usage(argv[0]);
252: }
253:
254: if (fname) {
255: umask(0077);
256: /* Restrictive access due to private key material. */
257: fd = open(fname, O_WRONLY | O_CREAT | O_EXCL | O_NOFOLLOW, S_IRUSR | S_IWUSR);
258: if (fd < 0) {
259: if (errno == EEXIST)
260: fprintf(stderr, "%s: file exists! Please use a different name.\n", fname);
261: else
262: fprintf(stderr, "%s: %s\n", fname, strerror(errno));
263: exit(1);
264: }
265: fp = fdopen(fd, "w");
266: if (fp == NULL) {
267: fprintf(stderr, "%s: %s\n", fname, strerror(errno));
268: close(fd);
269: exit(1);
270: }
271: }
272:
273: if (finput) {
274: /* Restrictive access once more. Do not be fooled by a link. */
275: fdin = open(finput, O_RDONLY | O_NOFOLLOW);
276: if (fdin < 0) {
277: if (errno == ELOOP)
278: fprintf(stderr, "%s: file is a link. Discarded for security.\n", fname);
279: if (fp)
280: fclose(fp);
281: exit(1);
282: }
283: fpin = fdopen(fdin, "r");
284: if (fpin == NULL) {
285: fprintf(stderr, "%s: %s\n", fname, strerror(errno));
286: close(fdin);
287: if (fp)
288: fclose(fp);
289: exit(1);
290: }
291:
292: }
293:
294: ploginit();
295: eay_init();
296:
297: if (fpin)
298: convert_rsa_key(fp, fpin);
299: else
300: gen_rsa_key(fp, bits, pubexp);
301:
302: fclose(fp);
303: if (fpin)
304: fclose(fpin);
305:
306: return 0;
307: }
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