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5a9a4b29 DSH |
1 | /* pk7_mime.c */ |
2 | /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL | |
27068df7 | 3 | * project. |
5a9a4b29 DSH |
4 | */ |
5 | /* ==================================================================== | |
27068df7 | 6 | * Copyright (c) 1999-2003 The OpenSSL Project. All rights reserved. |
5a9a4b29 DSH |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include <ctype.h> | |
61 | #include "cryptlib.h" | |
62 | #include <openssl/rand.h> | |
63 | #include <openssl/x509.h> | |
64 | ||
65 | /* MIME and related routines */ | |
66 | ||
67 | /* MIME format structures | |
68 | * Note that all are translated to lower case apart from | |
69 | * parameter values. Quotes are stripped off | |
70 | */ | |
71 | ||
5a9a4b29 DSH |
72 | typedef struct { |
73 | char *param_name; /* Param name e.g. "micalg" */ | |
74 | char *param_value; /* Param value e.g. "sha1" */ | |
75 | } MIME_PARAM; | |
76 | ||
e20d7d71 | 77 | DECLARE_STACK_OF(MIME_PARAM) |
371acb22 BL |
78 | IMPLEMENT_STACK_OF(MIME_PARAM) |
79 | ||
80 | typedef struct { | |
81 | char *name; /* Name of line e.g. "content-type" */ | |
82 | char *value; /* Value of line e.g. "text/plain" */ | |
83 | STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ | |
84 | } MIME_HEADER; | |
85 | ||
e20d7d71 | 86 | DECLARE_STACK_OF(MIME_HEADER) |
371acb22 | 87 | IMPLEMENT_STACK_OF(MIME_HEADER) |
5a9a4b29 | 88 | |
27068df7 | 89 | static int pkcs7_output_data(BIO *bio, BIO *data, PKCS7 *p7, int flags); |
5a9a4b29 DSH |
90 | static int B64_write_PKCS7(BIO *bio, PKCS7 *p7); |
91 | static PKCS7 *B64_read_PKCS7(BIO *bio); | |
92 | static char * strip_ends(char *name); | |
93 | static char * strip_start(char *name); | |
94 | static char * strip_end(char *name); | |
95 | static MIME_HEADER *mime_hdr_new(char *name, char *value); | |
96 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); | |
371acb22 | 97 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); |
ccd86b68 GT |
98 | static int mime_hdr_cmp(const MIME_HEADER * const *a, |
99 | const MIME_HEADER * const *b); | |
100 | static int mime_param_cmp(const MIME_PARAM * const *a, | |
101 | const MIME_PARAM * const *b); | |
5a9a4b29 DSH |
102 | static void mime_param_free(MIME_PARAM *param); |
103 | static int mime_bound_check(char *line, int linelen, char *bound, int blen); | |
371acb22 | 104 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); |
5a9a4b29 | 105 | static int iscrlf(char c); |
371acb22 | 106 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); |
5a9a4b29 DSH |
107 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); |
108 | static void mime_hdr_free(MIME_HEADER *hdr); | |
109 | ||
110 | #define MAX_SMLEN 1024 | |
111 | #define mime_debug(x) /* x */ | |
112 | ||
113 | ||
114 | typedef void (*stkfree)(); | |
115 | ||
116 | /* Base 64 read and write of PKCS#7 structure */ | |
117 | ||
118 | static int B64_write_PKCS7(BIO *bio, PKCS7 *p7) | |
119 | { | |
120 | BIO *b64; | |
121 | if(!(b64 = BIO_new(BIO_f_base64()))) { | |
122 | PKCS7err(PKCS7_F_B64_WRITE_PKCS7,ERR_R_MALLOC_FAILURE); | |
123 | return 0; | |
124 | } | |
125 | bio = BIO_push(b64, bio); | |
126 | i2d_PKCS7_bio(bio, p7); | |
127 | BIO_flush(bio); | |
128 | bio = BIO_pop(bio); | |
129 | BIO_free(b64); | |
130 | return 1; | |
131 | } | |
132 | ||
133 | static PKCS7 *B64_read_PKCS7(BIO *bio) | |
134 | { | |
135 | BIO *b64; | |
136 | PKCS7 *p7; | |
137 | if(!(b64 = BIO_new(BIO_f_base64()))) { | |
138 | PKCS7err(PKCS7_F_B64_READ_PKCS7,ERR_R_MALLOC_FAILURE); | |
139 | return 0; | |
140 | } | |
141 | bio = BIO_push(b64, bio); | |
142 | if(!(p7 = d2i_PKCS7_bio(bio, NULL))) | |
143 | PKCS7err(PKCS7_F_B64_READ_PKCS7,PKCS7_R_DECODE_ERROR); | |
144 | BIO_flush(bio); | |
145 | bio = BIO_pop(bio); | |
146 | BIO_free(b64); | |
147 | return p7; | |
148 | } | |
149 | ||
150 | /* SMIME sender */ | |
151 | ||
152 | int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags) | |
153 | { | |
5a9a4b29 DSH |
154 | char bound[33], c; |
155 | int i; | |
156 | if((flags & PKCS7_DETACHED) && data) { | |
157 | /* We want multipart/signed */ | |
158 | /* Generate a random boundary */ | |
373b575f | 159 | RAND_pseudo_bytes((unsigned char *)bound, 32); |
5a9a4b29 DSH |
160 | for(i = 0; i < 32; i++) { |
161 | c = bound[i] & 0xf; | |
162 | if(c < 10) c += '0'; | |
163 | else c += 'A' - 10; | |
164 | bound[i] = c; | |
165 | } | |
166 | bound[32] = 0; | |
ca6dde5d | 167 | BIO_printf(bio, "MIME-Version: 1.0\n"); |
16a44ae7 RL |
168 | BIO_printf(bio, "Content-Type: multipart/signed;"); |
169 | BIO_printf(bio, " protocol=\"application/x-pkcs7-signature\";"); | |
ca6dde5d | 170 | BIO_printf(bio, " micalg=sha1; boundary=\"----%s\"\n\n", bound); |
5a9a4b29 DSH |
171 | BIO_printf(bio, "This is an S/MIME signed message\n\n"); |
172 | /* Now write out the first part */ | |
8e6cbcd7 | 173 | BIO_printf(bio, "------%s\r\n", bound); |
27068df7 DSH |
174 | |
175 | pkcs7_output_data(bio, data, p7, flags); | |
176 | ||
ca6dde5d | 177 | BIO_printf(bio, "\n------%s\n", bound); |
5a9a4b29 DSH |
178 | |
179 | /* Headers for signature */ | |
180 | ||
ca6dde5d RL |
181 | BIO_printf(bio, "Content-Type: application/x-pkcs7-signature; name=\"smime.p7s\"\n"); |
182 | BIO_printf(bio, "Content-Transfer-Encoding: base64\n"); | |
183 | BIO_printf(bio, "Content-Disposition: attachment; filename=\"smime.p7s\"\n\n"); | |
5a9a4b29 | 184 | B64_write_PKCS7(bio, p7); |
ca6dde5d | 185 | BIO_printf(bio,"\n------%s--\n\n", bound); |
5a9a4b29 DSH |
186 | return 1; |
187 | } | |
188 | /* MIME headers */ | |
ca6dde5d RL |
189 | BIO_printf(bio, "MIME-Version: 1.0\n"); |
190 | BIO_printf(bio, "Content-Disposition: attachment; filename=\"smime.p7m\"\n"); | |
191 | BIO_printf(bio, "Content-Type: application/x-pkcs7-mime; name=\"smime.p7m\"\n"); | |
192 | BIO_printf(bio, "Content-Transfer-Encoding: base64\n\n"); | |
5a9a4b29 | 193 | B64_write_PKCS7(bio, p7); |
ca6dde5d | 194 | BIO_printf(bio, "\n"); |
5a9a4b29 DSH |
195 | return 1; |
196 | } | |
197 | ||
27068df7 DSH |
198 | /* Handle output of PKCS#7 data */ |
199 | ||
200 | ||
201 | static int pkcs7_output_data(BIO *out, BIO *data, PKCS7 *p7, int flags) | |
202 | { | |
203 | BIO *tmpbio, *p7bio; | |
204 | ||
205 | if (!(flags & PKCS7_PARTSIGN)) | |
206 | { | |
207 | SMIME_crlf_copy(data, out, flags); | |
208 | return 1; | |
209 | } | |
210 | ||
211 | /* Partial sign operation */ | |
212 | ||
213 | /* Initialize sign operation */ | |
214 | p7bio = PKCS7_dataInit(p7, out); | |
215 | ||
216 | /* Copy data across, computing digests etc */ | |
217 | SMIME_crlf_copy(data, p7bio, flags); | |
218 | ||
219 | /* Must be detached */ | |
220 | PKCS7_set_detached(p7, 1); | |
221 | ||
222 | /* Finalize signatures */ | |
223 | PKCS7_dataFinal(p7, p7bio); | |
224 | ||
225 | /* Now remove any digests from output BIO */ | |
226 | ||
227 | while (1) | |
228 | { | |
229 | tmpbio = BIO_pop(p7bio); | |
230 | if (tmpbio == out) | |
231 | break; | |
232 | BIO_free(tmpbio); | |
233 | } | |
234 | ||
235 | return 1; | |
236 | ||
237 | } | |
238 | ||
5a9a4b29 DSH |
239 | /* SMIME reader: handle multipart/signed and opaque signing. |
240 | * in multipart case the content is placed in a memory BIO | |
241 | * pointed to by "bcont". In opaque this is set to NULL | |
242 | */ | |
243 | ||
244 | PKCS7 *SMIME_read_PKCS7(BIO *bio, BIO **bcont) | |
245 | { | |
246 | BIO *p7in; | |
371acb22 BL |
247 | STACK_OF(MIME_HEADER) *headers = NULL; |
248 | STACK_OF(BIO) *parts = NULL; | |
5a9a4b29 DSH |
249 | MIME_HEADER *hdr; |
250 | MIME_PARAM *prm; | |
251 | PKCS7 *p7; | |
252 | int ret; | |
253 | ||
254 | if(bcont) *bcont = NULL; | |
255 | ||
256 | if (!(headers = mime_parse_hdr(bio))) { | |
257 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_PARSE_ERROR); | |
258 | return NULL; | |
259 | } | |
260 | ||
261 | if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
371acb22 | 262 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
263 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_CONTENT_TYPE); |
264 | return NULL; | |
265 | } | |
266 | ||
267 | /* Handle multipart/signed */ | |
268 | ||
269 | if(!strcmp(hdr->value, "multipart/signed")) { | |
270 | /* Split into two parts */ | |
271 | prm = mime_param_find(hdr, "boundary"); | |
272 | if(!prm || !prm->param_value) { | |
371acb22 | 273 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
274 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BOUNDARY); |
275 | return NULL; | |
276 | } | |
277 | ret = multi_split(bio, prm->param_value, &parts); | |
371acb22 BL |
278 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
279 | if(!ret || (sk_BIO_num(parts) != 2) ) { | |
5a9a4b29 | 280 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_MULTIPART_BODY_FAILURE); |
371acb22 | 281 | sk_BIO_pop_free(parts, BIO_vfree); |
5a9a4b29 DSH |
282 | return NULL; |
283 | } | |
284 | ||
285 | /* Parse the signature piece */ | |
371acb22 | 286 | p7in = sk_BIO_value(parts, 1); |
5a9a4b29 DSH |
287 | |
288 | if (!(headers = mime_parse_hdr(p7in))) { | |
289 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_MIME_SIG_PARSE_ERROR); | |
371acb22 | 290 | sk_BIO_pop_free(parts, BIO_vfree); |
5a9a4b29 DSH |
291 | return NULL; |
292 | } | |
293 | ||
294 | /* Get content type */ | |
295 | ||
296 | if(!(hdr = mime_hdr_find(headers, "content-type")) || | |
297 | !hdr->value) { | |
371acb22 | 298 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
299 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_NO_SIG_CONTENT_TYPE); |
300 | return NULL; | |
301 | } | |
302 | ||
303 | if(strcmp(hdr->value, "application/x-pkcs7-signature") && | |
304 | strcmp(hdr->value, "application/pkcs7-signature")) { | |
371acb22 | 305 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
306 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_SIG_INVALID_MIME_TYPE); |
307 | ERR_add_error_data(2, "type: ", hdr->value); | |
371acb22 | 308 | sk_BIO_pop_free(parts, BIO_vfree); |
5a9a4b29 DSH |
309 | return NULL; |
310 | } | |
371acb22 | 311 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
312 | /* Read in PKCS#7 */ |
313 | if(!(p7 = B64_read_PKCS7(p7in))) { | |
314 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_PKCS7_SIG_PARSE_ERROR); | |
371acb22 | 315 | sk_BIO_pop_free(parts, BIO_vfree); |
5a9a4b29 DSH |
316 | return NULL; |
317 | } | |
318 | ||
319 | if(bcont) { | |
371acb22 | 320 | *bcont = sk_BIO_value(parts, 0); |
5a9a4b29 | 321 | BIO_free(p7in); |
371acb22 BL |
322 | sk_BIO_free(parts); |
323 | } else sk_BIO_pop_free(parts, BIO_vfree); | |
5a9a4b29 DSH |
324 | return p7; |
325 | } | |
326 | ||
327 | /* OK, if not multipart/signed try opaque signature */ | |
328 | ||
329 | if (strcmp (hdr->value, "application/x-pkcs7-mime") && | |
330 | strcmp (hdr->value, "application/pkcs7-mime")) { | |
331 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7,PKCS7_R_INVALID_MIME_TYPE); | |
332 | ERR_add_error_data(2, "type: ", hdr->value); | |
371acb22 | 333 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
334 | return NULL; |
335 | } | |
336 | ||
371acb22 | 337 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
338 | |
339 | if(!(p7 = B64_read_PKCS7(bio))) { | |
340 | PKCS7err(PKCS7_F_SMIME_READ_PKCS7, PKCS7_R_PKCS7_PARSE_ERROR); | |
341 | return NULL; | |
342 | } | |
343 | return p7; | |
344 | ||
345 | } | |
346 | ||
347 | /* Copy text from one BIO to another making the output CRLF at EOL */ | |
348 | int SMIME_crlf_copy(BIO *in, BIO *out, int flags) | |
349 | { | |
350 | char eol; | |
351 | int len; | |
352 | char linebuf[MAX_SMLEN]; | |
353 | if(flags & PKCS7_BINARY) { | |
354 | while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) | |
355 | BIO_write(out, linebuf, len); | |
356 | return 1; | |
357 | } | |
27068df7 DSH |
358 | if(flags & PKCS7_TEXT) |
359 | BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); | |
5a9a4b29 DSH |
360 | while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) { |
361 | eol = 0; | |
362 | while(iscrlf(linebuf[len - 1])) { | |
363 | len--; | |
364 | eol = 1; | |
365 | } | |
366 | BIO_write(out, linebuf, len); | |
367 | if(eol) BIO_write(out, "\r\n", 2); | |
368 | } | |
369 | return 1; | |
370 | } | |
371 | ||
372 | /* Strip off headers if they are text/plain */ | |
373 | int SMIME_text(BIO *in, BIO *out) | |
374 | { | |
375 | char iobuf[4096]; | |
376 | int len; | |
371acb22 | 377 | STACK_OF(MIME_HEADER) *headers; |
5a9a4b29 | 378 | MIME_HEADER *hdr; |
371acb22 | 379 | |
5a9a4b29 DSH |
380 | if (!(headers = mime_parse_hdr(in))) { |
381 | PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_PARSE_ERROR); | |
382 | return 0; | |
383 | } | |
384 | if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { | |
385 | PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_MIME_NO_CONTENT_TYPE); | |
371acb22 | 386 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
387 | return 0; |
388 | } | |
389 | if (strcmp (hdr->value, "text/plain")) { | |
390 | PKCS7err(PKCS7_F_SMIME_TEXT,PKCS7_R_INVALID_MIME_TYPE); | |
391 | ERR_add_error_data(2, "type: ", hdr->value); | |
371acb22 | 392 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
393 | return 0; |
394 | } | |
371acb22 | 395 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
5a9a4b29 DSH |
396 | while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) |
397 | BIO_write(out, iobuf, len); | |
398 | return 1; | |
399 | } | |
400 | ||
401 | /* Split a multipart/XXX message body into component parts: result is | |
402 | * canonical parts in a STACK of bios | |
403 | */ | |
404 | ||
371acb22 | 405 | static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) |
5a9a4b29 DSH |
406 | { |
407 | char linebuf[MAX_SMLEN]; | |
408 | int len, blen; | |
409 | BIO *bpart = NULL; | |
371acb22 | 410 | STACK_OF(BIO) *parts; |
5a9a4b29 | 411 | char state, part, first; |
371acb22 | 412 | |
5a9a4b29 DSH |
413 | blen = strlen(bound); |
414 | part = 0; | |
415 | state = 0; | |
416 | first = 1; | |
62324627 | 417 | parts = sk_BIO_new_null(); |
5a9a4b29 DSH |
418 | *ret = parts; |
419 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
420 | state = mime_bound_check(linebuf, len, bound, blen); | |
421 | if(state == 1) { | |
422 | first = 1; | |
423 | part++; | |
424 | } else if(state == 2) { | |
371acb22 | 425 | sk_BIO_push(parts, bpart); |
5a9a4b29 DSH |
426 | return 1; |
427 | } else if(part) { | |
428 | if(first) { | |
429 | first = 0; | |
371acb22 | 430 | if(bpart) sk_BIO_push(parts, bpart); |
5a9a4b29 DSH |
431 | bpart = BIO_new(BIO_s_mem()); |
432 | ||
433 | } else BIO_write(bpart, "\r\n", 2); | |
434 | /* Strip CR+LF from linebuf */ | |
435 | while(iscrlf(linebuf[len - 1])) len--; | |
436 | BIO_write(bpart, linebuf, len); | |
437 | } | |
438 | } | |
439 | return 0; | |
440 | } | |
441 | ||
442 | static int iscrlf(char c) | |
443 | { | |
444 | if(c == '\r' || c == '\n') return 1; | |
445 | return 0; | |
446 | } | |
447 | ||
448 | /* This is the big one: parse MIME header lines up to message body */ | |
449 | ||
450 | #define MIME_INVALID 0 | |
451 | #define MIME_START 1 | |
452 | #define MIME_TYPE 2 | |
453 | #define MIME_NAME 3 | |
454 | #define MIME_VALUE 4 | |
455 | #define MIME_QUOTE 5 | |
456 | #define MIME_COMMENT 6 | |
457 | ||
458 | ||
371acb22 | 459 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) |
5a9a4b29 DSH |
460 | { |
461 | char *p, *q, c; | |
462 | char *ntmp; | |
463 | char linebuf[MAX_SMLEN]; | |
464 | MIME_HEADER *mhdr = NULL; | |
371acb22 | 465 | STACK_OF(MIME_HEADER) *headers; |
5a9a4b29 | 466 | int len, state, save_state = 0; |
371acb22 BL |
467 | |
468 | headers = sk_MIME_HEADER_new(mime_hdr_cmp); | |
5a9a4b29 DSH |
469 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { |
470 | /* If whitespace at line start then continuation line */ | |
a8eeb155 | 471 | if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME; |
5a9a4b29 DSH |
472 | else state = MIME_START; |
473 | ntmp = NULL; | |
474 | /* Go through all characters */ | |
475 | for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) { | |
476 | ||
477 | /* State machine to handle MIME headers | |
478 | * if this looks horrible that's because it *is* | |
479 | */ | |
480 | ||
481 | switch(state) { | |
482 | case MIME_START: | |
483 | if(c == ':') { | |
484 | state = MIME_TYPE; | |
485 | *p = 0; | |
486 | ntmp = strip_ends(q); | |
487 | q = p + 1; | |
488 | } | |
489 | break; | |
490 | ||
491 | case MIME_TYPE: | |
492 | if(c == ';') { | |
493 | mime_debug("Found End Value\n"); | |
494 | *p = 0; | |
495 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
371acb22 | 496 | sk_MIME_HEADER_push(headers, mhdr); |
5a9a4b29 DSH |
497 | ntmp = NULL; |
498 | q = p + 1; | |
499 | state = MIME_NAME; | |
500 | } else if(c == '(') { | |
501 | save_state = state; | |
502 | state = MIME_COMMENT; | |
503 | } | |
504 | break; | |
505 | ||
506 | case MIME_COMMENT: | |
507 | if(c == ')') { | |
508 | state = save_state; | |
509 | } | |
510 | break; | |
511 | ||
512 | case MIME_NAME: | |
513 | if(c == '=') { | |
514 | state = MIME_VALUE; | |
515 | *p = 0; | |
516 | ntmp = strip_ends(q); | |
517 | q = p + 1; | |
518 | } | |
519 | break ; | |
520 | ||
521 | case MIME_VALUE: | |
522 | if(c == ';') { | |
523 | state = MIME_NAME; | |
524 | *p = 0; | |
525 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
526 | ntmp = NULL; | |
527 | q = p + 1; | |
528 | } else if (c == '"') { | |
529 | mime_debug("Found Quote\n"); | |
530 | state = MIME_QUOTE; | |
531 | } else if(c == '(') { | |
532 | save_state = state; | |
533 | state = MIME_COMMENT; | |
534 | } | |
535 | break; | |
536 | ||
537 | case MIME_QUOTE: | |
538 | if(c == '"') { | |
539 | mime_debug("Found Match Quote\n"); | |
540 | state = MIME_VALUE; | |
541 | } | |
542 | break; | |
543 | } | |
544 | } | |
545 | ||
546 | if(state == MIME_TYPE) { | |
547 | mhdr = mime_hdr_new(ntmp, strip_ends(q)); | |
371acb22 | 548 | sk_MIME_HEADER_push(headers, mhdr); |
5a9a4b29 DSH |
549 | } else if(state == MIME_VALUE) |
550 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
551 | if(p == linebuf) break; /* Blank line means end of headers */ | |
552 | } | |
553 | ||
554 | return headers; | |
555 | ||
556 | } | |
557 | ||
558 | static char *strip_ends(char *name) | |
559 | { | |
560 | return strip_end(strip_start(name)); | |
561 | } | |
562 | ||
563 | /* Strip a parameter of whitespace from start of param */ | |
564 | static char *strip_start(char *name) | |
565 | { | |
566 | char *p, c; | |
567 | /* Look for first non white space or quote */ | |
568 | for(p = name; (c = *p) ;p++) { | |
569 | if(c == '"') { | |
570 | /* Next char is start of string if non null */ | |
571 | if(p[1]) return p + 1; | |
572 | /* Else null string */ | |
573 | return NULL; | |
574 | } | |
a8eeb155 | 575 | if(!isspace((unsigned char)c)) return p; |
5a9a4b29 DSH |
576 | } |
577 | return NULL; | |
578 | } | |
579 | ||
580 | /* As above but strip from end of string : maybe should handle brackets? */ | |
581 | static char *strip_end(char *name) | |
582 | { | |
583 | char *p, c; | |
584 | if(!name) return NULL; | |
585 | /* Look for first non white space or quote */ | |
586 | for(p = name + strlen(name) - 1; p >= name ;p--) { | |
587 | c = *p; | |
588 | if(c == '"') { | |
589 | if(p - 1 == name) return NULL; | |
590 | *p = 0; | |
591 | return name; | |
592 | } | |
a8eeb155 | 593 | if(isspace((unsigned char)c)) *p = 0; |
5a9a4b29 DSH |
594 | else return name; |
595 | } | |
596 | return NULL; | |
597 | } | |
598 | ||
599 | static MIME_HEADER *mime_hdr_new(char *name, char *value) | |
600 | { | |
601 | MIME_HEADER *mhdr; | |
602 | char *tmpname, *tmpval, *p; | |
603 | int c; | |
604 | if(name) { | |
605 | if(!(tmpname = BUF_strdup(name))) return NULL; | |
606 | for(p = tmpname ; *p; p++) { | |
607 | c = *p; | |
608 | if(isupper(c)) { | |
609 | c = tolower(c); | |
610 | *p = c; | |
611 | } | |
612 | } | |
613 | } else tmpname = NULL; | |
614 | if(value) { | |
615 | if(!(tmpval = BUF_strdup(value))) return NULL; | |
616 | for(p = tmpval ; *p; p++) { | |
617 | c = *p; | |
618 | if(isupper(c)) { | |
619 | c = tolower(c); | |
620 | *p = c; | |
621 | } | |
622 | } | |
623 | } else tmpval = NULL; | |
26a3a48d | 624 | mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER)); |
5a9a4b29 DSH |
625 | if(!mhdr) return NULL; |
626 | mhdr->name = tmpname; | |
627 | mhdr->value = tmpval; | |
371acb22 | 628 | if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL; |
5a9a4b29 DSH |
629 | return mhdr; |
630 | } | |
631 | ||
632 | static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) | |
633 | { | |
634 | char *tmpname, *tmpval, *p; | |
635 | int c; | |
636 | MIME_PARAM *mparam; | |
637 | if(name) { | |
638 | tmpname = BUF_strdup(name); | |
639 | if(!tmpname) return 0; | |
640 | for(p = tmpname ; *p; p++) { | |
641 | c = *p; | |
642 | if(isupper(c)) { | |
643 | c = tolower(c); | |
644 | *p = c; | |
645 | } | |
646 | } | |
647 | } else tmpname = NULL; | |
648 | if(value) { | |
649 | tmpval = BUF_strdup(value); | |
650 | if(!tmpval) return 0; | |
651 | } else tmpval = NULL; | |
657e60fa | 652 | /* Parameter values are case sensitive so leave as is */ |
26a3a48d | 653 | mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM)); |
5a9a4b29 DSH |
654 | if(!mparam) return 0; |
655 | mparam->param_name = tmpname; | |
656 | mparam->param_value = tmpval; | |
371acb22 | 657 | sk_MIME_PARAM_push(mhdr->params, mparam); |
5a9a4b29 DSH |
658 | return 1; |
659 | } | |
660 | ||
ccd86b68 GT |
661 | static int mime_hdr_cmp(const MIME_HEADER * const *a, |
662 | const MIME_HEADER * const *b) | |
5a9a4b29 DSH |
663 | { |
664 | return(strcmp((*a)->name, (*b)->name)); | |
665 | } | |
666 | ||
ccd86b68 GT |
667 | static int mime_param_cmp(const MIME_PARAM * const *a, |
668 | const MIME_PARAM * const *b) | |
5a9a4b29 DSH |
669 | { |
670 | return(strcmp((*a)->param_name, (*b)->param_name)); | |
671 | } | |
672 | ||
673 | /* Find a header with a given name (if possible) */ | |
674 | ||
371acb22 | 675 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) |
5a9a4b29 DSH |
676 | { |
677 | MIME_HEADER htmp; | |
678 | int idx; | |
679 | htmp.name = name; | |
371acb22 | 680 | idx = sk_MIME_HEADER_find(hdrs, &htmp); |
5a9a4b29 | 681 | if(idx < 0) return NULL; |
371acb22 | 682 | return sk_MIME_HEADER_value(hdrs, idx); |
5a9a4b29 DSH |
683 | } |
684 | ||
685 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) | |
686 | { | |
687 | MIME_PARAM param; | |
688 | int idx; | |
689 | param.param_name = name; | |
371acb22 | 690 | idx = sk_MIME_PARAM_find(hdr->params, ¶m); |
5a9a4b29 | 691 | if(idx < 0) return NULL; |
371acb22 | 692 | return sk_MIME_PARAM_value(hdr->params, idx); |
5a9a4b29 DSH |
693 | } |
694 | ||
695 | static void mime_hdr_free(MIME_HEADER *hdr) | |
696 | { | |
26a3a48d RL |
697 | if(hdr->name) OPENSSL_free(hdr->name); |
698 | if(hdr->value) OPENSSL_free(hdr->value); | |
371acb22 | 699 | if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); |
26a3a48d | 700 | OPENSSL_free(hdr); |
5a9a4b29 DSH |
701 | } |
702 | ||
703 | static void mime_param_free(MIME_PARAM *param) | |
704 | { | |
26a3a48d RL |
705 | if(param->param_name) OPENSSL_free(param->param_name); |
706 | if(param->param_value) OPENSSL_free(param->param_value); | |
707 | OPENSSL_free(param); | |
5a9a4b29 DSH |
708 | } |
709 | ||
710 | /* Check for a multipart boundary. Returns: | |
711 | * 0 : no boundary | |
712 | * 1 : part boundary | |
713 | * 2 : final boundary | |
714 | */ | |
715 | static int mime_bound_check(char *line, int linelen, char *bound, int blen) | |
716 | { | |
717 | if(linelen == -1) linelen = strlen(line); | |
718 | if(blen == -1) blen = strlen(bound); | |
719 | /* Quickly eliminate if line length too short */ | |
720 | if(blen + 2 > linelen) return 0; | |
721 | /* Check for part boundary */ | |
722 | if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { | |
723 | if(!strncmp(line + blen + 2, "--", 2)) return 2; | |
724 | else return 1; | |
725 | } | |
726 | return 0; | |
727 | } |