1*0957b409SSimon J. Gerraty /*
2*0957b409SSimon J. Gerraty * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
3*0957b409SSimon J. Gerraty *
4*0957b409SSimon J. Gerraty * Permission is hereby granted, free of charge, to any person obtaining
5*0957b409SSimon J. Gerraty * a copy of this software and associated documentation files (the
6*0957b409SSimon J. Gerraty * "Software"), to deal in the Software without restriction, including
7*0957b409SSimon J. Gerraty * without limitation the rights to use, copy, modify, merge, publish,
8*0957b409SSimon J. Gerraty * distribute, sublicense, and/or sell copies of the Software, and to
9*0957b409SSimon J. Gerraty * permit persons to whom the Software is furnished to do so, subject to
10*0957b409SSimon J. Gerraty * the following conditions:
11*0957b409SSimon J. Gerraty *
12*0957b409SSimon J. Gerraty * The above copyright notice and this permission notice shall be
13*0957b409SSimon J. Gerraty * included in all copies or substantial portions of the Software.
14*0957b409SSimon J. Gerraty *
15*0957b409SSimon J. Gerraty * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16*0957b409SSimon J. Gerraty * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17*0957b409SSimon J. Gerraty * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18*0957b409SSimon J. Gerraty * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19*0957b409SSimon J. Gerraty * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20*0957b409SSimon J. Gerraty * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21*0957b409SSimon J. Gerraty * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22*0957b409SSimon J. Gerraty * SOFTWARE.
23*0957b409SSimon J. Gerraty */
24*0957b409SSimon J. Gerraty
25*0957b409SSimon J. Gerraty #include <stdio.h>
26*0957b409SSimon J. Gerraty #include <stdlib.h>
27*0957b409SSimon J. Gerraty #include <string.h>
28*0957b409SSimon J. Gerraty #include <stdint.h>
29*0957b409SSimon J. Gerraty #include <errno.h>
30*0957b409SSimon J. Gerraty
31*0957b409SSimon J. Gerraty #include "brssl.h"
32*0957b409SSimon J. Gerraty
33*0957b409SSimon J. Gerraty /* see brssl.h */
34*0957b409SSimon J. Gerraty unsigned char *
read_file(const char * fname,size_t * len)35*0957b409SSimon J. Gerraty read_file(const char *fname, size_t *len)
36*0957b409SSimon J. Gerraty {
37*0957b409SSimon J. Gerraty bvector vbuf = VEC_INIT;
38*0957b409SSimon J. Gerraty FILE *f;
39*0957b409SSimon J. Gerraty
40*0957b409SSimon J. Gerraty *len = 0;
41*0957b409SSimon J. Gerraty f = fopen(fname, "rb");
42*0957b409SSimon J. Gerraty if (f == NULL) {
43*0957b409SSimon J. Gerraty fprintf(stderr,
44*0957b409SSimon J. Gerraty "ERROR: could not open file '%s' for reading\n", fname);
45*0957b409SSimon J. Gerraty return NULL;
46*0957b409SSimon J. Gerraty }
47*0957b409SSimon J. Gerraty for (;;) {
48*0957b409SSimon J. Gerraty unsigned char tmp[1024];
49*0957b409SSimon J. Gerraty size_t rlen;
50*0957b409SSimon J. Gerraty
51*0957b409SSimon J. Gerraty rlen = fread(tmp, 1, sizeof tmp, f);
52*0957b409SSimon J. Gerraty if (rlen == 0) {
53*0957b409SSimon J. Gerraty unsigned char *buf;
54*0957b409SSimon J. Gerraty
55*0957b409SSimon J. Gerraty if (ferror(f)) {
56*0957b409SSimon J. Gerraty fprintf(stderr,
57*0957b409SSimon J. Gerraty "ERROR: read error on file '%s'\n",
58*0957b409SSimon J. Gerraty fname);
59*0957b409SSimon J. Gerraty fclose(f);
60*0957b409SSimon J. Gerraty return NULL;
61*0957b409SSimon J. Gerraty }
62*0957b409SSimon J. Gerraty buf = VEC_TOARRAY(vbuf);
63*0957b409SSimon J. Gerraty *len = VEC_LEN(vbuf);
64*0957b409SSimon J. Gerraty VEC_CLEAR(vbuf);
65*0957b409SSimon J. Gerraty fclose(f);
66*0957b409SSimon J. Gerraty return buf;
67*0957b409SSimon J. Gerraty }
68*0957b409SSimon J. Gerraty VEC_ADDMANY(vbuf, tmp, rlen);
69*0957b409SSimon J. Gerraty }
70*0957b409SSimon J. Gerraty }
71*0957b409SSimon J. Gerraty
72*0957b409SSimon J. Gerraty /* see brssl.h */
73*0957b409SSimon J. Gerraty int
write_file(const char * fname,const void * data,size_t len)74*0957b409SSimon J. Gerraty write_file(const char *fname, const void *data, size_t len)
75*0957b409SSimon J. Gerraty {
76*0957b409SSimon J. Gerraty FILE *f;
77*0957b409SSimon J. Gerraty const unsigned char *buf;
78*0957b409SSimon J. Gerraty
79*0957b409SSimon J. Gerraty f = fopen(fname, "wb");
80*0957b409SSimon J. Gerraty if (f == NULL) {
81*0957b409SSimon J. Gerraty fprintf(stderr,
82*0957b409SSimon J. Gerraty "ERROR: could not open file '%s' for reading\n", fname);
83*0957b409SSimon J. Gerraty return -1;
84*0957b409SSimon J. Gerraty }
85*0957b409SSimon J. Gerraty buf = data;
86*0957b409SSimon J. Gerraty while (len > 0) {
87*0957b409SSimon J. Gerraty size_t wlen;
88*0957b409SSimon J. Gerraty
89*0957b409SSimon J. Gerraty wlen = fwrite(buf, 1, len, f);
90*0957b409SSimon J. Gerraty if (wlen == 0) {
91*0957b409SSimon J. Gerraty fprintf(stderr,
92*0957b409SSimon J. Gerraty "ERROR: could not write all bytes to '%s'\n",
93*0957b409SSimon J. Gerraty fname);
94*0957b409SSimon J. Gerraty fclose(f);
95*0957b409SSimon J. Gerraty return -1;
96*0957b409SSimon J. Gerraty }
97*0957b409SSimon J. Gerraty buf += wlen;
98*0957b409SSimon J. Gerraty len -= wlen;
99*0957b409SSimon J. Gerraty }
100*0957b409SSimon J. Gerraty if (ferror(f)) {
101*0957b409SSimon J. Gerraty fprintf(stderr, "ERROR: write error on file '%s'\n", fname);
102*0957b409SSimon J. Gerraty fclose(f);
103*0957b409SSimon J. Gerraty return -1;
104*0957b409SSimon J. Gerraty }
105*0957b409SSimon J. Gerraty fclose(f);
106*0957b409SSimon J. Gerraty return 0;
107*0957b409SSimon J. Gerraty }
108*0957b409SSimon J. Gerraty
109*0957b409SSimon J. Gerraty /* see brssl.h */
110*0957b409SSimon J. Gerraty int
looks_like_DER(const unsigned char * buf,size_t len)111*0957b409SSimon J. Gerraty looks_like_DER(const unsigned char *buf, size_t len)
112*0957b409SSimon J. Gerraty {
113*0957b409SSimon J. Gerraty int fb;
114*0957b409SSimon J. Gerraty size_t dlen;
115*0957b409SSimon J. Gerraty
116*0957b409SSimon J. Gerraty if (len < 2) {
117*0957b409SSimon J. Gerraty return 0;
118*0957b409SSimon J. Gerraty }
119*0957b409SSimon J. Gerraty if (*buf ++ != 0x30) {
120*0957b409SSimon J. Gerraty return 0;
121*0957b409SSimon J. Gerraty }
122*0957b409SSimon J. Gerraty fb = *buf ++;
123*0957b409SSimon J. Gerraty len -= 2;
124*0957b409SSimon J. Gerraty if (fb < 0x80) {
125*0957b409SSimon J. Gerraty return (size_t)fb == len;
126*0957b409SSimon J. Gerraty } else if (fb == 0x80) {
127*0957b409SSimon J. Gerraty return 0;
128*0957b409SSimon J. Gerraty } else {
129*0957b409SSimon J. Gerraty fb -= 0x80;
130*0957b409SSimon J. Gerraty if (len < (size_t)fb + 2) {
131*0957b409SSimon J. Gerraty return 0;
132*0957b409SSimon J. Gerraty }
133*0957b409SSimon J. Gerraty len -= (size_t)fb;
134*0957b409SSimon J. Gerraty dlen = 0;
135*0957b409SSimon J. Gerraty while (fb -- > 0) {
136*0957b409SSimon J. Gerraty if (dlen > (len >> 8)) {
137*0957b409SSimon J. Gerraty return 0;
138*0957b409SSimon J. Gerraty }
139*0957b409SSimon J. Gerraty dlen = (dlen << 8) + (size_t)*buf ++;
140*0957b409SSimon J. Gerraty }
141*0957b409SSimon J. Gerraty return dlen == len;
142*0957b409SSimon J. Gerraty }
143*0957b409SSimon J. Gerraty }
144*0957b409SSimon J. Gerraty
145*0957b409SSimon J. Gerraty static void
vblob_append(void * cc,const void * data,size_t len)146*0957b409SSimon J. Gerraty vblob_append(void *cc, const void *data, size_t len)
147*0957b409SSimon J. Gerraty {
148*0957b409SSimon J. Gerraty bvector *bv;
149*0957b409SSimon J. Gerraty
150*0957b409SSimon J. Gerraty bv = cc;
151*0957b409SSimon J. Gerraty VEC_ADDMANY(*bv, data, len);
152*0957b409SSimon J. Gerraty }
153*0957b409SSimon J. Gerraty
154*0957b409SSimon J. Gerraty /* see brssl.h */
155*0957b409SSimon J. Gerraty void
free_pem_object_contents(pem_object * po)156*0957b409SSimon J. Gerraty free_pem_object_contents(pem_object *po)
157*0957b409SSimon J. Gerraty {
158*0957b409SSimon J. Gerraty if (po != NULL) {
159*0957b409SSimon J. Gerraty xfree(po->name);
160*0957b409SSimon J. Gerraty xfree(po->data);
161*0957b409SSimon J. Gerraty }
162*0957b409SSimon J. Gerraty }
163*0957b409SSimon J. Gerraty
164*0957b409SSimon J. Gerraty /* see brssl.h */
165*0957b409SSimon J. Gerraty pem_object *
decode_pem(const void * src,size_t len,size_t * num)166*0957b409SSimon J. Gerraty decode_pem(const void *src, size_t len, size_t *num)
167*0957b409SSimon J. Gerraty {
168*0957b409SSimon J. Gerraty VECTOR(pem_object) pem_list = VEC_INIT;
169*0957b409SSimon J. Gerraty br_pem_decoder_context pc;
170*0957b409SSimon J. Gerraty pem_object po, *pos;
171*0957b409SSimon J. Gerraty const unsigned char *buf;
172*0957b409SSimon J. Gerraty bvector bv = VEC_INIT;
173*0957b409SSimon J. Gerraty int inobj;
174*0957b409SSimon J. Gerraty int extra_nl;
175*0957b409SSimon J. Gerraty
176*0957b409SSimon J. Gerraty *num = 0;
177*0957b409SSimon J. Gerraty br_pem_decoder_init(&pc);
178*0957b409SSimon J. Gerraty buf = src;
179*0957b409SSimon J. Gerraty inobj = 0;
180*0957b409SSimon J. Gerraty po.name = NULL;
181*0957b409SSimon J. Gerraty po.data = NULL;
182*0957b409SSimon J. Gerraty po.data_len = 0;
183*0957b409SSimon J. Gerraty extra_nl = 1;
184*0957b409SSimon J. Gerraty while (len > 0) {
185*0957b409SSimon J. Gerraty size_t tlen;
186*0957b409SSimon J. Gerraty
187*0957b409SSimon J. Gerraty tlen = br_pem_decoder_push(&pc, buf, len);
188*0957b409SSimon J. Gerraty buf += tlen;
189*0957b409SSimon J. Gerraty len -= tlen;
190*0957b409SSimon J. Gerraty switch (br_pem_decoder_event(&pc)) {
191*0957b409SSimon J. Gerraty
192*0957b409SSimon J. Gerraty case BR_PEM_BEGIN_OBJ:
193*0957b409SSimon J. Gerraty po.name = xstrdup(br_pem_decoder_name(&pc));
194*0957b409SSimon J. Gerraty br_pem_decoder_setdest(&pc, vblob_append, &bv);
195*0957b409SSimon J. Gerraty inobj = 1;
196*0957b409SSimon J. Gerraty break;
197*0957b409SSimon J. Gerraty
198*0957b409SSimon J. Gerraty case BR_PEM_END_OBJ:
199*0957b409SSimon J. Gerraty if (inobj) {
200*0957b409SSimon J. Gerraty po.data = VEC_TOARRAY(bv);
201*0957b409SSimon J. Gerraty po.data_len = VEC_LEN(bv);
202*0957b409SSimon J. Gerraty VEC_ADD(pem_list, po);
203*0957b409SSimon J. Gerraty VEC_CLEAR(bv);
204*0957b409SSimon J. Gerraty po.name = NULL;
205*0957b409SSimon J. Gerraty po.data = NULL;
206*0957b409SSimon J. Gerraty po.data_len = 0;
207*0957b409SSimon J. Gerraty inobj = 0;
208*0957b409SSimon J. Gerraty }
209*0957b409SSimon J. Gerraty break;
210*0957b409SSimon J. Gerraty
211*0957b409SSimon J. Gerraty case BR_PEM_ERROR:
212*0957b409SSimon J. Gerraty xfree(po.name);
213*0957b409SSimon J. Gerraty VEC_CLEAR(bv);
214*0957b409SSimon J. Gerraty fprintf(stderr,
215*0957b409SSimon J. Gerraty "ERROR: invalid PEM encoding\n");
216*0957b409SSimon J. Gerraty VEC_CLEAREXT(pem_list, &free_pem_object_contents);
217*0957b409SSimon J. Gerraty return NULL;
218*0957b409SSimon J. Gerraty }
219*0957b409SSimon J. Gerraty
220*0957b409SSimon J. Gerraty /*
221*0957b409SSimon J. Gerraty * We add an extra newline at the end, in order to
222*0957b409SSimon J. Gerraty * support PEM files that lack the newline on their last
223*0957b409SSimon J. Gerraty * line (this is somwehat invalid, but PEM format is not
224*0957b409SSimon J. Gerraty * standardised and such files do exist in the wild, so
225*0957b409SSimon J. Gerraty * we'd better accept them).
226*0957b409SSimon J. Gerraty */
227*0957b409SSimon J. Gerraty if (len == 0 && extra_nl) {
228*0957b409SSimon J. Gerraty extra_nl = 0;
229*0957b409SSimon J. Gerraty buf = (const unsigned char *)"\n";
230*0957b409SSimon J. Gerraty len = 1;
231*0957b409SSimon J. Gerraty }
232*0957b409SSimon J. Gerraty }
233*0957b409SSimon J. Gerraty if (inobj) {
234*0957b409SSimon J. Gerraty fprintf(stderr, "ERROR: unfinished PEM object\n");
235*0957b409SSimon J. Gerraty xfree(po.name);
236*0957b409SSimon J. Gerraty VEC_CLEAR(bv);
237*0957b409SSimon J. Gerraty VEC_CLEAREXT(pem_list, &free_pem_object_contents);
238*0957b409SSimon J. Gerraty return NULL;
239*0957b409SSimon J. Gerraty }
240*0957b409SSimon J. Gerraty
241*0957b409SSimon J. Gerraty *num = VEC_LEN(pem_list);
242*0957b409SSimon J. Gerraty VEC_ADD(pem_list, po);
243*0957b409SSimon J. Gerraty pos = VEC_TOARRAY(pem_list);
244*0957b409SSimon J. Gerraty VEC_CLEAR(pem_list);
245*0957b409SSimon J. Gerraty return pos;
246*0957b409SSimon J. Gerraty }
247*0957b409SSimon J. Gerraty
248*0957b409SSimon J. Gerraty /* see brssl.h */
249*0957b409SSimon J. Gerraty br_x509_certificate *
read_certificates(const char * fname,size_t * num)250*0957b409SSimon J. Gerraty read_certificates(const char *fname, size_t *num)
251*0957b409SSimon J. Gerraty {
252*0957b409SSimon J. Gerraty VECTOR(br_x509_certificate) cert_list = VEC_INIT;
253*0957b409SSimon J. Gerraty unsigned char *buf;
254*0957b409SSimon J. Gerraty size_t len;
255*0957b409SSimon J. Gerraty pem_object *pos;
256*0957b409SSimon J. Gerraty size_t u, num_pos;
257*0957b409SSimon J. Gerraty br_x509_certificate *xcs;
258*0957b409SSimon J. Gerraty br_x509_certificate dummy;
259*0957b409SSimon J. Gerraty
260*0957b409SSimon J. Gerraty *num = 0;
261*0957b409SSimon J. Gerraty
262*0957b409SSimon J. Gerraty /*
263*0957b409SSimon J. Gerraty * TODO: reading the whole file is crude; we could parse them
264*0957b409SSimon J. Gerraty * in a streamed fashion. But it does not matter much in practice.
265*0957b409SSimon J. Gerraty */
266*0957b409SSimon J. Gerraty buf = read_file(fname, &len);
267*0957b409SSimon J. Gerraty if (buf == NULL) {
268*0957b409SSimon J. Gerraty return NULL;
269*0957b409SSimon J. Gerraty }
270*0957b409SSimon J. Gerraty
271*0957b409SSimon J. Gerraty /*
272*0957b409SSimon J. Gerraty * Check for a DER-encoded certificate.
273*0957b409SSimon J. Gerraty */
274*0957b409SSimon J. Gerraty if (looks_like_DER(buf, len)) {
275*0957b409SSimon J. Gerraty xcs = xmalloc(2 * sizeof *xcs);
276*0957b409SSimon J. Gerraty xcs[0].data = buf;
277*0957b409SSimon J. Gerraty xcs[0].data_len = len;
278*0957b409SSimon J. Gerraty xcs[1].data = NULL;
279*0957b409SSimon J. Gerraty xcs[1].data_len = 0;
280*0957b409SSimon J. Gerraty *num = 1;
281*0957b409SSimon J. Gerraty return xcs;
282*0957b409SSimon J. Gerraty }
283*0957b409SSimon J. Gerraty
284*0957b409SSimon J. Gerraty pos = decode_pem(buf, len, &num_pos);
285*0957b409SSimon J. Gerraty xfree(buf);
286*0957b409SSimon J. Gerraty if (pos == NULL) {
287*0957b409SSimon J. Gerraty return NULL;
288*0957b409SSimon J. Gerraty }
289*0957b409SSimon J. Gerraty for (u = 0; u < num_pos; u ++) {
290*0957b409SSimon J. Gerraty if (eqstr(pos[u].name, "CERTIFICATE")
291*0957b409SSimon J. Gerraty || eqstr(pos[u].name, "X509 CERTIFICATE"))
292*0957b409SSimon J. Gerraty {
293*0957b409SSimon J. Gerraty br_x509_certificate xc;
294*0957b409SSimon J. Gerraty
295*0957b409SSimon J. Gerraty xc.data = pos[u].data;
296*0957b409SSimon J. Gerraty xc.data_len = pos[u].data_len;
297*0957b409SSimon J. Gerraty pos[u].data = NULL;
298*0957b409SSimon J. Gerraty VEC_ADD(cert_list, xc);
299*0957b409SSimon J. Gerraty }
300*0957b409SSimon J. Gerraty }
301*0957b409SSimon J. Gerraty for (u = 0; u < num_pos; u ++) {
302*0957b409SSimon J. Gerraty free_pem_object_contents(&pos[u]);
303*0957b409SSimon J. Gerraty }
304*0957b409SSimon J. Gerraty xfree(pos);
305*0957b409SSimon J. Gerraty
306*0957b409SSimon J. Gerraty if (VEC_LEN(cert_list) == 0) {
307*0957b409SSimon J. Gerraty fprintf(stderr, "ERROR: no certificate in file '%s'\n", fname);
308*0957b409SSimon J. Gerraty return NULL;
309*0957b409SSimon J. Gerraty }
310*0957b409SSimon J. Gerraty *num = VEC_LEN(cert_list);
311*0957b409SSimon J. Gerraty dummy.data = NULL;
312*0957b409SSimon J. Gerraty dummy.data_len = 0;
313*0957b409SSimon J. Gerraty VEC_ADD(cert_list, dummy);
314*0957b409SSimon J. Gerraty xcs = VEC_TOARRAY(cert_list);
315*0957b409SSimon J. Gerraty VEC_CLEAR(cert_list);
316*0957b409SSimon J. Gerraty return xcs;
317*0957b409SSimon J. Gerraty }
318*0957b409SSimon J. Gerraty
319*0957b409SSimon J. Gerraty /* see brssl.h */
320*0957b409SSimon J. Gerraty void
free_certificates(br_x509_certificate * certs,size_t num)321*0957b409SSimon J. Gerraty free_certificates(br_x509_certificate *certs, size_t num)
322*0957b409SSimon J. Gerraty {
323*0957b409SSimon J. Gerraty size_t u;
324*0957b409SSimon J. Gerraty
325*0957b409SSimon J. Gerraty for (u = 0; u < num; u ++) {
326*0957b409SSimon J. Gerraty xfree(certs[u].data);
327*0957b409SSimon J. Gerraty }
328*0957b409SSimon J. Gerraty xfree(certs);
329*0957b409SSimon J. Gerraty }
330