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Commit | Line | Data |
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0f113f3e | 1 | /* |
6738bf14 | 2 | * Copyright 2008-2018 The OpenSSL Project Authors. All Rights Reserved. |
8931b30d | 3 | * |
b1322259 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8931b30d DSH |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
a1df06b3 | 11 | #include "internal/ctype.h" |
b39fc560 | 12 | #include "internal/cryptlib.h" |
8931b30d DSH |
13 | #include <openssl/rand.h> |
14 | #include <openssl/x509.h> | |
15 | #include <openssl/asn1.h> | |
16 | #include <openssl/asn1t.h> | |
ab0a14bb | 17 | #include "internal/evp_int.h" |
a146ae55 | 18 | #include "internal/bio.h" |
8931b30d DSH |
19 | #include "asn1_locl.h" |
20 | ||
0f113f3e MC |
21 | /* |
22 | * Generalised MIME like utilities for streaming ASN1. Although many have a | |
23 | * PKCS7/CMS like flavour others are more general purpose. | |
8931b30d DSH |
24 | */ |
25 | ||
0f113f3e MC |
26 | /* |
27 | * MIME format structures Note that all are translated to lower case apart | |
28 | * from parameter values. Quotes are stripped off | |
8931b30d DSH |
29 | */ |
30 | ||
4a1f3f27 | 31 | struct mime_param_st { |
0f113f3e MC |
32 | char *param_name; /* Param name e.g. "micalg" */ |
33 | char *param_value; /* Param value e.g. "sha1" */ | |
4a1f3f27 | 34 | }; |
8931b30d | 35 | |
4a1f3f27 | 36 | struct mime_header_st { |
0f113f3e MC |
37 | char *name; /* Name of line e.g. "content-type" */ |
38 | char *value; /* Value of line e.g. "text/plain" */ | |
39 | STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ | |
4a1f3f27 | 40 | }; |
8931b30d DSH |
41 | |
42 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, | |
0f113f3e MC |
43 | const ASN1_ITEM *it); |
44 | static char *strip_ends(char *name); | |
45 | static char *strip_start(char *name); | |
46 | static char *strip_end(char *name); | |
bd227450 F |
47 | static MIME_HEADER *mime_hdr_new(const char *name, const char *value); |
48 | static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value); | |
8931b30d | 49 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); |
0f113f3e MC |
50 | static int mime_hdr_cmp(const MIME_HEADER *const *a, |
51 | const MIME_HEADER *const *b); | |
52 | static int mime_param_cmp(const MIME_PARAM *const *a, | |
53 | const MIME_PARAM *const *b); | |
8931b30d | 54 | static void mime_param_free(MIME_PARAM *param); |
bd227450 F |
55 | static int mime_bound_check(char *line, int linelen, const char *bound, int blen); |
56 | static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret); | |
847865d0 | 57 | static int strip_eol(char *linebuf, int *plen, int flags); |
bd227450 F |
58 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name); |
59 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name); | |
8931b30d DSH |
60 | static void mime_hdr_free(MIME_HEADER *hdr); |
61 | ||
62 | #define MAX_SMLEN 1024 | |
0f113f3e | 63 | #define mime_debug(x) /* x */ |
8931b30d DSH |
64 | |
65 | /* Output an ASN1 structure in BER format streaming if necessary */ | |
66 | ||
67 | int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
68 | const ASN1_ITEM *it) |
69 | { | |
70 | /* If streaming create stream BIO and copy all content through it */ | |
71 | if (flags & SMIME_STREAM) { | |
72 | BIO *bio, *tbio; | |
73 | bio = BIO_new_NDEF(out, val, it); | |
74 | if (!bio) { | |
75 | ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE); | |
76 | return 0; | |
77 | } | |
78 | SMIME_crlf_copy(in, bio, flags); | |
79 | (void)BIO_flush(bio); | |
80 | /* Free up successive BIOs until we hit the old output BIO */ | |
81 | do { | |
82 | tbio = BIO_pop(bio); | |
83 | BIO_free(bio); | |
84 | bio = tbio; | |
85 | } while (bio != out); | |
86 | } | |
87 | /* | |
88 | * else just write out ASN1 structure which will have all content stored | |
89 | * internally | |
90 | */ | |
91 | else | |
92 | ASN1_item_i2d_bio(it, out, val); | |
93 | return 1; | |
94 | } | |
8931b30d DSH |
95 | |
96 | /* Base 64 read and write of ASN1 structure */ | |
97 | ||
98 | static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
99 | const ASN1_ITEM *it) |
100 | { | |
101 | BIO *b64; | |
102 | int r; | |
103 | b64 = BIO_new(BIO_f_base64()); | |
90945fa3 | 104 | if (b64 == NULL) { |
0f113f3e MC |
105 | ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE); |
106 | return 0; | |
107 | } | |
108 | /* | |
109 | * prepend the b64 BIO so all data is base64 encoded. | |
110 | */ | |
111 | out = BIO_push(b64, out); | |
112 | r = i2d_ASN1_bio_stream(out, val, in, flags, it); | |
113 | (void)BIO_flush(out); | |
114 | BIO_pop(out); | |
115 | BIO_free(b64); | |
116 | return r; | |
117 | } | |
8931b30d DSH |
118 | |
119 | /* Streaming ASN1 PEM write */ | |
120 | ||
121 | int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, | |
0f113f3e MC |
122 | const char *hdr, const ASN1_ITEM *it) |
123 | { | |
124 | int r; | |
125 | BIO_printf(out, "-----BEGIN %s-----\n", hdr); | |
126 | r = B64_write_ASN1(out, val, in, flags, it); | |
127 | BIO_printf(out, "-----END %s-----\n", hdr); | |
128 | return r; | |
129 | } | |
8931b30d DSH |
130 | |
131 | static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) | |
132 | { | |
0f113f3e MC |
133 | BIO *b64; |
134 | ASN1_VALUE *val; | |
75ebbd9a RS |
135 | |
136 | if ((b64 = BIO_new(BIO_f_base64())) == NULL) { | |
0f113f3e MC |
137 | ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE); |
138 | return 0; | |
139 | } | |
140 | bio = BIO_push(b64, bio); | |
141 | val = ASN1_item_d2i_bio(it, bio, NULL); | |
142 | if (!val) | |
143 | ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR); | |
144 | (void)BIO_flush(bio); | |
d278284e | 145 | BIO_pop(bio); |
0f113f3e MC |
146 | BIO_free(b64); |
147 | return val; | |
8931b30d DSH |
148 | } |
149 | ||
150 | /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ | |
151 | ||
152 | static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) | |
0f113f3e MC |
153 | { |
154 | const EVP_MD *md; | |
155 | int i, have_unknown = 0, write_comma, ret = 0, md_nid; | |
156 | have_unknown = 0; | |
157 | write_comma = 0; | |
158 | for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) { | |
159 | if (write_comma) | |
160 | BIO_write(out, ",", 1); | |
161 | write_comma = 1; | |
162 | md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); | |
163 | md = EVP_get_digestbynid(md_nid); | |
164 | if (md && md->md_ctrl) { | |
165 | int rv; | |
166 | char *micstr; | |
167 | rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); | |
168 | if (rv > 0) { | |
169 | BIO_puts(out, micstr); | |
170 | OPENSSL_free(micstr); | |
171 | continue; | |
172 | } | |
173 | if (rv != -2) | |
174 | goto err; | |
175 | } | |
176 | switch (md_nid) { | |
177 | case NID_sha1: | |
178 | BIO_puts(out, "sha1"); | |
179 | break; | |
180 | ||
181 | case NID_md5: | |
182 | BIO_puts(out, "md5"); | |
183 | break; | |
184 | ||
185 | case NID_sha256: | |
186 | BIO_puts(out, "sha-256"); | |
187 | break; | |
188 | ||
189 | case NID_sha384: | |
190 | BIO_puts(out, "sha-384"); | |
191 | break; | |
192 | ||
193 | case NID_sha512: | |
194 | BIO_puts(out, "sha-512"); | |
195 | break; | |
196 | ||
197 | case NID_id_GostR3411_94: | |
198 | BIO_puts(out, "gostr3411-94"); | |
199 | goto err; | |
0f113f3e MC |
200 | |
201 | default: | |
202 | if (have_unknown) | |
203 | write_comma = 0; | |
204 | else { | |
205 | BIO_puts(out, "unknown"); | |
206 | have_unknown = 1; | |
207 | } | |
208 | break; | |
209 | ||
210 | } | |
211 | } | |
212 | ||
213 | ret = 1; | |
214 | err: | |
215 | ||
216 | return ret; | |
217 | ||
218 | } | |
8931b30d DSH |
219 | |
220 | /* SMIME sender */ | |
221 | ||
222 | int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, | |
0f113f3e MC |
223 | int ctype_nid, int econt_nid, |
224 | STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it) | |
8931b30d | 225 | { |
0f113f3e MC |
226 | char bound[33], c; |
227 | int i; | |
228 | const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; | |
229 | const char *msg_type = NULL; | |
230 | if (flags & SMIME_OLDMIME) | |
231 | mime_prefix = "application/x-pkcs7-"; | |
232 | else | |
233 | mime_prefix = "application/pkcs7-"; | |
234 | ||
235 | if (flags & SMIME_CRLFEOL) | |
236 | mime_eol = "\r\n"; | |
237 | else | |
238 | mime_eol = "\n"; | |
239 | if ((flags & SMIME_DETACHED) && data) { | |
240 | /* We want multipart/signed */ | |
241 | /* Generate a random boundary */ | |
266483d2 MC |
242 | if (RAND_bytes((unsigned char *)bound, 32) <= 0) |
243 | return 0; | |
0f113f3e MC |
244 | for (i = 0; i < 32; i++) { |
245 | c = bound[i] & 0xf; | |
246 | if (c < 10) | |
247 | c += '0'; | |
248 | else | |
249 | c += 'A' - 10; | |
250 | bound[i] = c; | |
251 | } | |
252 | bound[32] = 0; | |
253 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
254 | BIO_printf(bio, "Content-Type: multipart/signed;"); | |
255 | BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); | |
256 | BIO_puts(bio, " micalg=\""); | |
257 | asn1_write_micalg(bio, mdalgs); | |
258 | BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", | |
259 | bound, mime_eol, mime_eol); | |
260 | BIO_printf(bio, "This is an S/MIME signed message%s%s", | |
261 | mime_eol, mime_eol); | |
262 | /* Now write out the first part */ | |
263 | BIO_printf(bio, "------%s%s", bound, mime_eol); | |
264 | if (!asn1_output_data(bio, data, val, flags, it)) | |
265 | return 0; | |
266 | BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); | |
267 | ||
268 | /* Headers for signature */ | |
269 | ||
270 | BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); | |
271 | BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); | |
272 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol); | |
273 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
274 | BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol); | |
275 | B64_write_ASN1(bio, val, NULL, 0, it); | |
276 | BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound, | |
277 | mime_eol, mime_eol); | |
278 | return 1; | |
279 | } | |
280 | ||
281 | /* Determine smime-type header */ | |
282 | ||
283 | if (ctype_nid == NID_pkcs7_enveloped) | |
284 | msg_type = "enveloped-data"; | |
285 | else if (ctype_nid == NID_pkcs7_signed) { | |
286 | if (econt_nid == NID_id_smime_ct_receipt) | |
287 | msg_type = "signed-receipt"; | |
288 | else if (sk_X509_ALGOR_num(mdalgs) >= 0) | |
289 | msg_type = "signed-data"; | |
290 | else | |
291 | msg_type = "certs-only"; | |
292 | } else if (ctype_nid == NID_id_smime_ct_compressedData) { | |
293 | msg_type = "compressed-data"; | |
294 | cname = "smime.p7z"; | |
295 | } | |
296 | /* MIME headers */ | |
297 | BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); | |
298 | BIO_printf(bio, "Content-Disposition: attachment;"); | |
299 | BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); | |
300 | BIO_printf(bio, "Content-Type: %smime;", mime_prefix); | |
301 | if (msg_type) | |
302 | BIO_printf(bio, " smime-type=%s;", msg_type); | |
303 | BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); | |
304 | BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", | |
305 | mime_eol, mime_eol); | |
306 | if (!B64_write_ASN1(bio, val, data, flags, it)) | |
307 | return 0; | |
308 | BIO_printf(bio, "%s", mime_eol); | |
309 | return 1; | |
8931b30d DSH |
310 | } |
311 | ||
312 | /* Handle output of ASN1 data */ | |
313 | ||
8931b30d | 314 | static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, |
0f113f3e MC |
315 | const ASN1_ITEM *it) |
316 | { | |
317 | BIO *tmpbio; | |
318 | const ASN1_AUX *aux = it->funcs; | |
319 | ASN1_STREAM_ARG sarg; | |
320 | int rv = 1; | |
321 | ||
322 | /* | |
0d4fb843 | 323 | * If data is not detached or resigning then the output BIO is already |
0f113f3e MC |
324 | * set up to finalise when it is written through. |
325 | */ | |
326 | if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) { | |
327 | SMIME_crlf_copy(data, out, flags); | |
328 | return 1; | |
329 | } | |
330 | ||
331 | if (!aux || !aux->asn1_cb) { | |
332 | ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED); | |
333 | return 0; | |
334 | } | |
335 | ||
336 | sarg.out = out; | |
337 | sarg.ndef_bio = NULL; | |
338 | sarg.boundary = NULL; | |
339 | ||
340 | /* Let ASN1 code prepend any needed BIOs */ | |
341 | ||
342 | if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) | |
343 | return 0; | |
344 | ||
345 | /* Copy data across, passing through filter BIOs for processing */ | |
346 | SMIME_crlf_copy(data, sarg.ndef_bio, flags); | |
347 | ||
348 | /* Finalize structure */ | |
349 | if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) | |
350 | rv = 0; | |
351 | ||
352 | /* Now remove any digests prepended to the BIO */ | |
353 | ||
354 | while (sarg.ndef_bio != out) { | |
355 | tmpbio = BIO_pop(sarg.ndef_bio); | |
356 | BIO_free(sarg.ndef_bio); | |
357 | sarg.ndef_bio = tmpbio; | |
358 | } | |
359 | ||
360 | return rv; | |
361 | ||
362 | } | |
363 | ||
364 | /* | |
365 | * SMIME reader: handle multipart/signed and opaque signing. in multipart | |
366 | * case the content is placed in a memory BIO pointed to by "bcont". In | |
367 | * opaque this is set to NULL | |
8931b30d DSH |
368 | */ |
369 | ||
2e86f0d8 | 370 | ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) |
8931b30d | 371 | { |
0f113f3e MC |
372 | BIO *asnin; |
373 | STACK_OF(MIME_HEADER) *headers = NULL; | |
374 | STACK_OF(BIO) *parts = NULL; | |
375 | MIME_HEADER *hdr; | |
376 | MIME_PARAM *prm; | |
377 | ASN1_VALUE *val; | |
378 | int ret; | |
379 | ||
380 | if (bcont) | |
381 | *bcont = NULL; | |
382 | ||
75ebbd9a | 383 | if ((headers = mime_parse_hdr(bio)) == NULL) { |
0f113f3e MC |
384 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR); |
385 | return NULL; | |
386 | } | |
387 | ||
75ebbd9a RS |
388 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
389 | || hdr->value == NULL) { | |
0f113f3e MC |
390 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
391 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); | |
392 | return NULL; | |
393 | } | |
394 | ||
395 | /* Handle multipart/signed */ | |
396 | ||
86885c28 | 397 | if (strcmp(hdr->value, "multipart/signed") == 0) { |
0f113f3e MC |
398 | /* Split into two parts */ |
399 | prm = mime_param_find(hdr, "boundary"); | |
400 | if (!prm || !prm->param_value) { | |
401 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
402 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); | |
403 | return NULL; | |
404 | } | |
405 | ret = multi_split(bio, prm->param_value, &parts); | |
406 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
407 | if (!ret || (sk_BIO_num(parts) != 2)) { | |
408 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); | |
409 | sk_BIO_pop_free(parts, BIO_vfree); | |
410 | return NULL; | |
411 | } | |
412 | ||
413 | /* Parse the signature piece */ | |
414 | asnin = sk_BIO_value(parts, 1); | |
415 | ||
75ebbd9a | 416 | if ((headers = mime_parse_hdr(asnin)) == NULL) { |
0f113f3e MC |
417 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR); |
418 | sk_BIO_pop_free(parts, BIO_vfree); | |
419 | return NULL; | |
420 | } | |
421 | ||
422 | /* Get content type */ | |
423 | ||
75ebbd9a RS |
424 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
425 | || hdr->value == NULL) { | |
0f113f3e MC |
426 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); |
427 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); | |
a26dd465 | 428 | sk_BIO_pop_free(parts, BIO_vfree); |
0f113f3e MC |
429 | return NULL; |
430 | } | |
431 | ||
432 | if (strcmp(hdr->value, "application/x-pkcs7-signature") && | |
433 | strcmp(hdr->value, "application/pkcs7-signature")) { | |
434 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE); | |
435 | ERR_add_error_data(2, "type: ", hdr->value); | |
436 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
437 | sk_BIO_pop_free(parts, BIO_vfree); | |
438 | return NULL; | |
439 | } | |
440 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
441 | /* Read in ASN1 */ | |
75ebbd9a | 442 | if ((val = b64_read_asn1(asnin, it)) == NULL) { |
0f113f3e MC |
443 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR); |
444 | sk_BIO_pop_free(parts, BIO_vfree); | |
445 | return NULL; | |
446 | } | |
447 | ||
448 | if (bcont) { | |
449 | *bcont = sk_BIO_value(parts, 0); | |
450 | BIO_free(asnin); | |
451 | sk_BIO_free(parts); | |
452 | } else | |
453 | sk_BIO_pop_free(parts, BIO_vfree); | |
454 | return val; | |
455 | } | |
456 | ||
457 | /* OK, if not multipart/signed try opaque signature */ | |
458 | ||
459 | if (strcmp(hdr->value, "application/x-pkcs7-mime") && | |
460 | strcmp(hdr->value, "application/pkcs7-mime")) { | |
461 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE); | |
462 | ERR_add_error_data(2, "type: ", hdr->value); | |
463 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
464 | return NULL; | |
465 | } | |
466 | ||
467 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
468 | ||
75ebbd9a | 469 | if ((val = b64_read_asn1(bio, it)) == NULL) { |
0f113f3e MC |
470 | ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); |
471 | return NULL; | |
472 | } | |
473 | return val; | |
8931b30d DSH |
474 | |
475 | } | |
476 | ||
477 | /* Copy text from one BIO to another making the output CRLF at EOL */ | |
478 | int SMIME_crlf_copy(BIO *in, BIO *out, int flags) | |
479 | { | |
0f113f3e MC |
480 | BIO *bf; |
481 | char eol; | |
482 | int len; | |
483 | char linebuf[MAX_SMLEN]; | |
484 | /* | |
485 | * Buffer output so we don't write one line at a time. This is useful | |
486 | * when streaming as we don't end up with one OCTET STRING per line. | |
487 | */ | |
488 | bf = BIO_new(BIO_f_buffer()); | |
90945fa3 | 489 | if (bf == NULL) |
0f113f3e MC |
490 | return 0; |
491 | out = BIO_push(bf, out); | |
492 | if (flags & SMIME_BINARY) { | |
493 | while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) | |
494 | BIO_write(out, linebuf, len); | |
495 | } else { | |
496 | int eolcnt = 0; | |
497 | if (flags & SMIME_TEXT) | |
498 | BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); | |
499 | while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) { | |
500 | eol = strip_eol(linebuf, &len, flags); | |
501 | if (len) { | |
502 | /* Not EOF: write out all CRLF */ | |
503 | if (flags & SMIME_ASCIICRLF) { | |
504 | int i; | |
505 | for (i = 0; i < eolcnt; i++) | |
506 | BIO_write(out, "\r\n", 2); | |
507 | eolcnt = 0; | |
508 | } | |
509 | BIO_write(out, linebuf, len); | |
510 | if (eol) | |
511 | BIO_write(out, "\r\n", 2); | |
512 | } else if (flags & SMIME_ASCIICRLF) | |
513 | eolcnt++; | |
514 | else if (eol) | |
515 | BIO_write(out, "\r\n", 2); | |
516 | } | |
517 | } | |
518 | (void)BIO_flush(out); | |
519 | BIO_pop(out); | |
520 | BIO_free(bf); | |
521 | return 1; | |
8931b30d DSH |
522 | } |
523 | ||
524 | /* Strip off headers if they are text/plain */ | |
525 | int SMIME_text(BIO *in, BIO *out) | |
526 | { | |
0f113f3e MC |
527 | char iobuf[4096]; |
528 | int len; | |
529 | STACK_OF(MIME_HEADER) *headers; | |
530 | MIME_HEADER *hdr; | |
531 | ||
75ebbd9a | 532 | if ((headers = mime_parse_hdr(in)) == NULL) { |
0f113f3e MC |
533 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR); |
534 | return 0; | |
535 | } | |
75ebbd9a RS |
536 | if ((hdr = mime_hdr_find(headers, "content-type")) == NULL |
537 | || hdr->value == NULL) { | |
0f113f3e MC |
538 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE); |
539 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
540 | return 0; | |
541 | } | |
542 | if (strcmp(hdr->value, "text/plain")) { | |
543 | ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE); | |
544 | ERR_add_error_data(2, "type: ", hdr->value); | |
545 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
546 | return 0; | |
547 | } | |
548 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
549 | while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) | |
550 | BIO_write(out, iobuf, len); | |
551 | if (len < 0) | |
552 | return 0; | |
553 | return 1; | |
8931b30d DSH |
554 | } |
555 | ||
0f113f3e MC |
556 | /* |
557 | * Split a multipart/XXX message body into component parts: result is | |
8931b30d DSH |
558 | * canonical parts in a STACK of bios |
559 | */ | |
560 | ||
bd227450 | 561 | static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret) |
8931b30d | 562 | { |
0f113f3e MC |
563 | char linebuf[MAX_SMLEN]; |
564 | int len, blen; | |
565 | int eol = 0, next_eol = 0; | |
566 | BIO *bpart = NULL; | |
567 | STACK_OF(BIO) *parts; | |
568 | char state, part, first; | |
569 | ||
570 | blen = strlen(bound); | |
571 | part = 0; | |
572 | state = 0; | |
573 | first = 1; | |
574 | parts = sk_BIO_new_null(); | |
575 | *ret = parts; | |
576 | if (*ret == NULL) | |
577 | return 0; | |
578 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
579 | state = mime_bound_check(linebuf, len, bound, blen); | |
580 | if (state == 1) { | |
581 | first = 1; | |
582 | part++; | |
583 | } else if (state == 2) { | |
584 | if (!sk_BIO_push(parts, bpart)) { | |
585 | BIO_free(bpart); | |
586 | return 0; | |
587 | } | |
588 | return 1; | |
589 | } else if (part) { | |
590 | /* Strip CR+LF from linebuf */ | |
591 | next_eol = strip_eol(linebuf, &len, 0); | |
592 | if (first) { | |
593 | first = 0; | |
594 | if (bpart) | |
595 | if (!sk_BIO_push(parts, bpart)) { | |
596 | BIO_free(bpart); | |
597 | return 0; | |
598 | } | |
599 | bpart = BIO_new(BIO_s_mem()); | |
600 | if (bpart == NULL) | |
601 | return 0; | |
602 | BIO_set_mem_eof_return(bpart, 0); | |
603 | } else if (eol) | |
604 | BIO_write(bpart, "\r\n", 2); | |
605 | eol = next_eol; | |
606 | if (len) | |
607 | BIO_write(bpart, linebuf, len); | |
608 | } | |
609 | } | |
ca3a82c3 | 610 | BIO_free(bpart); |
0f113f3e | 611 | return 0; |
8931b30d DSH |
612 | } |
613 | ||
614 | /* This is the big one: parse MIME header lines up to message body */ | |
615 | ||
0f113f3e MC |
616 | #define MIME_INVALID 0 |
617 | #define MIME_START 1 | |
618 | #define MIME_TYPE 2 | |
619 | #define MIME_NAME 3 | |
620 | #define MIME_VALUE 4 | |
621 | #define MIME_QUOTE 5 | |
622 | #define MIME_COMMENT 6 | |
8931b30d DSH |
623 | |
624 | static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) | |
625 | { | |
0f113f3e MC |
626 | char *p, *q, c; |
627 | char *ntmp; | |
628 | char linebuf[MAX_SMLEN]; | |
68efafc5 | 629 | MIME_HEADER *mhdr = NULL, *new_hdr = NULL; |
0f113f3e MC |
630 | STACK_OF(MIME_HEADER) *headers; |
631 | int len, state, save_state = 0; | |
632 | ||
633 | headers = sk_MIME_HEADER_new(mime_hdr_cmp); | |
90945fa3 | 634 | if (headers == NULL) |
0f113f3e MC |
635 | return NULL; |
636 | while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { | |
637 | /* If whitespace at line start then continuation line */ | |
a1df06b3 | 638 | if (mhdr && ossl_isspace(linebuf[0])) |
0f113f3e MC |
639 | state = MIME_NAME; |
640 | else | |
641 | state = MIME_START; | |
642 | ntmp = NULL; | |
643 | /* Go through all characters */ | |
644 | for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n'); | |
645 | p++) { | |
646 | ||
647 | /* | |
648 | * State machine to handle MIME headers if this looks horrible | |
649 | * that's because it *is* | |
650 | */ | |
651 | ||
652 | switch (state) { | |
653 | case MIME_START: | |
654 | if (c == ':') { | |
655 | state = MIME_TYPE; | |
656 | *p = 0; | |
657 | ntmp = strip_ends(q); | |
658 | q = p + 1; | |
659 | } | |
660 | break; | |
661 | ||
662 | case MIME_TYPE: | |
663 | if (c == ';') { | |
664 | mime_debug("Found End Value\n"); | |
665 | *p = 0; | |
68efafc5 F |
666 | new_hdr = mime_hdr_new(ntmp, strip_ends(q)); |
667 | if (new_hdr == NULL) | |
668 | goto err; | |
669 | if (!sk_MIME_HEADER_push(headers, new_hdr)) | |
670 | goto err; | |
671 | mhdr = new_hdr; | |
672 | new_hdr = NULL; | |
0f113f3e MC |
673 | ntmp = NULL; |
674 | q = p + 1; | |
675 | state = MIME_NAME; | |
676 | } else if (c == '(') { | |
677 | save_state = state; | |
678 | state = MIME_COMMENT; | |
679 | } | |
680 | break; | |
681 | ||
682 | case MIME_COMMENT: | |
683 | if (c == ')') { | |
684 | state = save_state; | |
685 | } | |
686 | break; | |
687 | ||
688 | case MIME_NAME: | |
689 | if (c == '=') { | |
690 | state = MIME_VALUE; | |
691 | *p = 0; | |
692 | ntmp = strip_ends(q); | |
693 | q = p + 1; | |
694 | } | |
695 | break; | |
696 | ||
697 | case MIME_VALUE: | |
698 | if (c == ';') { | |
699 | state = MIME_NAME; | |
700 | *p = 0; | |
701 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
702 | ntmp = NULL; | |
703 | q = p + 1; | |
704 | } else if (c == '"') { | |
705 | mime_debug("Found Quote\n"); | |
706 | state = MIME_QUOTE; | |
707 | } else if (c == '(') { | |
708 | save_state = state; | |
709 | state = MIME_COMMENT; | |
710 | } | |
711 | break; | |
712 | ||
713 | case MIME_QUOTE: | |
714 | if (c == '"') { | |
715 | mime_debug("Found Match Quote\n"); | |
716 | state = MIME_VALUE; | |
717 | } | |
718 | break; | |
719 | } | |
720 | } | |
721 | ||
722 | if (state == MIME_TYPE) { | |
68efafc5 F |
723 | new_hdr = mime_hdr_new(ntmp, strip_ends(q)); |
724 | if (new_hdr == NULL) | |
725 | goto err; | |
726 | if (!sk_MIME_HEADER_push(headers, new_hdr)) | |
727 | goto err; | |
728 | mhdr = new_hdr; | |
729 | new_hdr = NULL; | |
0f113f3e MC |
730 | } else if (state == MIME_VALUE) |
731 | mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); | |
732 | if (p == linebuf) | |
733 | break; /* Blank line means end of headers */ | |
734 | } | |
735 | ||
736 | return headers; | |
8931b30d | 737 | |
68efafc5 F |
738 | err: |
739 | mime_hdr_free(new_hdr); | |
740 | sk_MIME_HEADER_pop_free(headers, mime_hdr_free); | |
741 | return NULL; | |
8931b30d DSH |
742 | } |
743 | ||
744 | static char *strip_ends(char *name) | |
745 | { | |
0f113f3e | 746 | return strip_end(strip_start(name)); |
8931b30d DSH |
747 | } |
748 | ||
749 | /* Strip a parameter of whitespace from start of param */ | |
750 | static char *strip_start(char *name) | |
751 | { | |
0f113f3e MC |
752 | char *p, c; |
753 | /* Look for first non white space or quote */ | |
754 | for (p = name; (c = *p); p++) { | |
755 | if (c == '"') { | |
756 | /* Next char is start of string if non null */ | |
757 | if (p[1]) | |
758 | return p + 1; | |
759 | /* Else null string */ | |
760 | return NULL; | |
761 | } | |
a1df06b3 | 762 | if (!ossl_isspace(c)) |
0f113f3e MC |
763 | return p; |
764 | } | |
765 | return NULL; | |
8931b30d DSH |
766 | } |
767 | ||
768 | /* As above but strip from end of string : maybe should handle brackets? */ | |
769 | static char *strip_end(char *name) | |
770 | { | |
0f113f3e MC |
771 | char *p, c; |
772 | if (!name) | |
773 | return NULL; | |
774 | /* Look for first non white space or quote */ | |
775 | for (p = name + strlen(name) - 1; p >= name; p--) { | |
776 | c = *p; | |
777 | if (c == '"') { | |
778 | if (p - 1 == name) | |
779 | return NULL; | |
780 | *p = 0; | |
781 | return name; | |
782 | } | |
a1df06b3 | 783 | if (ossl_isspace(c)) |
0f113f3e MC |
784 | *p = 0; |
785 | else | |
786 | return name; | |
787 | } | |
788 | return NULL; | |
8931b30d DSH |
789 | } |
790 | ||
bd227450 | 791 | static MIME_HEADER *mime_hdr_new(const char *name, const char *value) |
8931b30d | 792 | { |
0f113f3e MC |
793 | MIME_HEADER *mhdr = NULL; |
794 | char *tmpname = NULL, *tmpval = NULL, *p; | |
75ebbd9a | 795 | |
0f113f3e | 796 | if (name) { |
7644a9ae | 797 | if ((tmpname = OPENSSL_strdup(name)) == NULL) |
0f113f3e | 798 | return NULL; |
a1df06b3 P |
799 | for (p = tmpname; *p; p++) |
800 | *p = ossl_tolower(*p); | |
0f113f3e MC |
801 | } |
802 | if (value) { | |
7644a9ae | 803 | if ((tmpval = OPENSSL_strdup(value)) == NULL) |
0f113f3e | 804 | goto err; |
a1df06b3 P |
805 | for (p = tmpval; *p; p++) |
806 | *p = ossl_tolower(*p); | |
0f113f3e | 807 | } |
b4faea50 | 808 | mhdr = OPENSSL_malloc(sizeof(*mhdr)); |
90945fa3 | 809 | if (mhdr == NULL) |
0f113f3e MC |
810 | goto err; |
811 | mhdr->name = tmpname; | |
812 | mhdr->value = tmpval; | |
75ebbd9a | 813 | if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL) |
0f113f3e MC |
814 | goto err; |
815 | return mhdr; | |
816 | ||
817 | err: | |
b548a1f1 RS |
818 | OPENSSL_free(tmpname); |
819 | OPENSSL_free(tmpval); | |
820 | OPENSSL_free(mhdr); | |
0f113f3e | 821 | return NULL; |
8931b30d | 822 | } |
0f113f3e | 823 | |
bd227450 | 824 | static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value) |
8931b30d | 825 | { |
0f113f3e | 826 | char *tmpname = NULL, *tmpval = NULL, *p; |
0f113f3e | 827 | MIME_PARAM *mparam = NULL; |
a1df06b3 | 828 | |
0f113f3e | 829 | if (name) { |
7644a9ae | 830 | tmpname = OPENSSL_strdup(name); |
0f113f3e MC |
831 | if (!tmpname) |
832 | goto err; | |
a1df06b3 P |
833 | for (p = tmpname; *p; p++) |
834 | *p = ossl_tolower(*p); | |
0f113f3e MC |
835 | } |
836 | if (value) { | |
7644a9ae | 837 | tmpval = OPENSSL_strdup(value); |
0f113f3e MC |
838 | if (!tmpval) |
839 | goto err; | |
840 | } | |
841 | /* Parameter values are case sensitive so leave as is */ | |
b4faea50 | 842 | mparam = OPENSSL_malloc(sizeof(*mparam)); |
90945fa3 | 843 | if (mparam == NULL) |
0f113f3e MC |
844 | goto err; |
845 | mparam->param_name = tmpname; | |
846 | mparam->param_value = tmpval; | |
847 | if (!sk_MIME_PARAM_push(mhdr->params, mparam)) | |
848 | goto err; | |
849 | return 1; | |
850 | err: | |
b548a1f1 RS |
851 | OPENSSL_free(tmpname); |
852 | OPENSSL_free(tmpval); | |
853 | OPENSSL_free(mparam); | |
0f113f3e | 854 | return 0; |
8931b30d DSH |
855 | } |
856 | ||
0f113f3e MC |
857 | static int mime_hdr_cmp(const MIME_HEADER *const *a, |
858 | const MIME_HEADER *const *b) | |
8931b30d | 859 | { |
0f113f3e MC |
860 | if (!(*a)->name || !(*b)->name) |
861 | return ! !(*a)->name - ! !(*b)->name; | |
6941b7b9 | 862 | |
26a7d938 | 863 | return strcmp((*a)->name, (*b)->name); |
8931b30d DSH |
864 | } |
865 | ||
0f113f3e MC |
866 | static int mime_param_cmp(const MIME_PARAM *const *a, |
867 | const MIME_PARAM *const *b) | |
8931b30d | 868 | { |
0f113f3e MC |
869 | if (!(*a)->param_name || !(*b)->param_name) |
870 | return ! !(*a)->param_name - ! !(*b)->param_name; | |
26a7d938 | 871 | return strcmp((*a)->param_name, (*b)->param_name); |
8931b30d DSH |
872 | } |
873 | ||
874 | /* Find a header with a given name (if possible) */ | |
875 | ||
bd227450 | 876 | static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name) |
8931b30d | 877 | { |
7f96f15b | 878 | MIME_HEADER htmp; |
0f113f3e | 879 | int idx; |
bd227450 | 880 | |
7f96f15b RS |
881 | htmp.name = (char *)name; |
882 | htmp.value = NULL; | |
883 | htmp.params = NULL; | |
884 | ||
0f113f3e MC |
885 | idx = sk_MIME_HEADER_find(hdrs, &htmp); |
886 | if (idx < 0) | |
887 | return NULL; | |
888 | return sk_MIME_HEADER_value(hdrs, idx); | |
8931b30d DSH |
889 | } |
890 | ||
bd227450 | 891 | static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name) |
8931b30d | 892 | { |
7f96f15b | 893 | MIME_PARAM param; |
0f113f3e | 894 | int idx; |
bd227450 | 895 | |
7f96f15b RS |
896 | param.param_name = (char *)name; |
897 | param.param_value = NULL; | |
0f113f3e MC |
898 | idx = sk_MIME_PARAM_find(hdr->params, ¶m); |
899 | if (idx < 0) | |
900 | return NULL; | |
901 | return sk_MIME_PARAM_value(hdr->params, idx); | |
8931b30d DSH |
902 | } |
903 | ||
904 | static void mime_hdr_free(MIME_HEADER *hdr) | |
905 | { | |
030648ce MC |
906 | if (hdr == NULL) |
907 | return; | |
b548a1f1 RS |
908 | OPENSSL_free(hdr->name); |
909 | OPENSSL_free(hdr->value); | |
0f113f3e MC |
910 | if (hdr->params) |
911 | sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); | |
912 | OPENSSL_free(hdr); | |
8931b30d DSH |
913 | } |
914 | ||
915 | static void mime_param_free(MIME_PARAM *param) | |
916 | { | |
b548a1f1 RS |
917 | OPENSSL_free(param->param_name); |
918 | OPENSSL_free(param->param_value); | |
0f113f3e | 919 | OPENSSL_free(param); |
8931b30d DSH |
920 | } |
921 | ||
c80fd6b2 MC |
922 | /*- |
923 | * Check for a multipart boundary. Returns: | |
8931b30d DSH |
924 | * 0 : no boundary |
925 | * 1 : part boundary | |
926 | * 2 : final boundary | |
927 | */ | |
bd227450 | 928 | static int mime_bound_check(char *line, int linelen, const char *bound, int blen) |
8931b30d | 929 | { |
0f113f3e MC |
930 | if (linelen == -1) |
931 | linelen = strlen(line); | |
932 | if (blen == -1) | |
933 | blen = strlen(bound); | |
934 | /* Quickly eliminate if line length too short */ | |
935 | if (blen + 2 > linelen) | |
936 | return 0; | |
937 | /* Check for part boundary */ | |
86885c28 RS |
938 | if ((strncmp(line, "--", 2) == 0) |
939 | && strncmp(line + 2, bound, blen) == 0) { | |
940 | if (strncmp(line + blen + 2, "--", 2) == 0) | |
0f113f3e MC |
941 | return 2; |
942 | else | |
943 | return 1; | |
944 | } | |
945 | return 0; | |
8931b30d DSH |
946 | } |
947 | ||
847865d0 | 948 | static int strip_eol(char *linebuf, int *plen, int flags) |
0f113f3e MC |
949 | { |
950 | int len = *plen; | |
951 | char *p, c; | |
952 | int is_eol = 0; | |
0c1aaa24 | 953 | |
0f113f3e MC |
954 | for (p = linebuf + len - 1; len > 0; len--, p--) { |
955 | c = *p; | |
956 | if (c == '\n') | |
957 | is_eol = 1; | |
958 | else if (is_eol && flags & SMIME_ASCIICRLF && c < 33) | |
959 | continue; | |
960 | else if (c != '\r') | |
961 | break; | |
962 | } | |
963 | *plen = len; | |
964 | return is_eol; | |
965 | } |