1218822Sdim/* asn_mime.c */ 2130561Sobrien/* 3218822Sdim * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 4218822Sdim * project. 5218822Sdim */ 6130561Sobrien/* ==================================================================== 7218822Sdim * Copyright (c) 1999-2018 The OpenSSL Project. All rights reserved. 8130561Sobrien * 9218822Sdim * Redistribution and use in source and binary forms, with or without 10218822Sdim * modification, are permitted provided that the following conditions 11218822Sdim * are met: 12218822Sdim * 13218822Sdim * 1. Redistributions of source code must retain the above copyright 14218822Sdim * notice, this list of conditions and the following disclaimer. 15218822Sdim * 16218822Sdim * 2. Redistributions in binary form must reproduce the above copyright 17218822Sdim * notice, this list of conditions and the following disclaimer in 18218822Sdim * the documentation and/or other materials provided with the 19218822Sdim * distribution. 20218822Sdim * 21218822Sdim * 3. All advertising materials mentioning features or use of this 22218822Sdim * software must display the following acknowledgment: 23218822Sdim * "This product includes software developed by the OpenSSL Project 24218822Sdim * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25218822Sdim * 26218822Sdim * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27218822Sdim * endorse or promote products derived from this software without 28218822Sdim * prior written permission. For written permission, please contact 29218822Sdim * licensing@OpenSSL.org. 30218822Sdim * 31218822Sdim * 5. Products derived from this software may not be called "OpenSSL" 32218822Sdim * nor may "OpenSSL" appear in their names without prior written 33218822Sdim * permission of the OpenSSL Project. 34218822Sdim * 35218822Sdim * 6. Redistributions of any form whatsoever must retain the following 36218822Sdim * acknowledgment: 37218822Sdim * "This product includes software developed by the OpenSSL Project 38218822Sdim * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39218822Sdim * 40218822Sdim * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41218822Sdim * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42218822Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43218822Sdim * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44218822Sdim * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45218822Sdim * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46218822Sdim * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47218822Sdim * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48218822Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49218822Sdim * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50218822Sdim * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51218822Sdim * OF THE POSSIBILITY OF SUCH DAMAGE. 52218822Sdim * ==================================================================== 53218822Sdim * 54218822Sdim */ 55218822Sdim 56218822Sdim#include <stdio.h> 57218822Sdim#include <ctype.h> 58218822Sdim#include "cryptlib.h" 59218822Sdim#include <openssl/rand.h> 60218822Sdim#include <openssl/x509.h> 61218822Sdim#include <openssl/asn1.h> 62218822Sdim#include <openssl/asn1t.h> 63218822Sdim#include "asn1_locl.h" 64218822Sdim 65218822Sdim/* 66218822Sdim * Generalised MIME like utilities for streaming ASN1. Although many have a 67218822Sdim * PKCS7/CMS like flavour others are more general purpose. 68218822Sdim */ 69218822Sdim 70218822Sdim/* 71218822Sdim * MIME format structures Note that all are translated to lower case apart 72218822Sdim * from parameter values. Quotes are stripped off 73218822Sdim */ 74218822Sdim 75218822Sdimtypedef struct { 76218822Sdim char *param_name; /* Param name e.g. "micalg" */ 77218822Sdim char *param_value; /* Param value e.g. "sha1" */ 78218822Sdim} MIME_PARAM; 79218822Sdim 80218822SdimDECLARE_STACK_OF(MIME_PARAM) 81218822SdimIMPLEMENT_STACK_OF(MIME_PARAM) 82218822Sdim 83218822Sdimtypedef struct { 84218822Sdim char *name; /* Name of line e.g. "content-type" */ 85218822Sdim char *value; /* Value of line e.g. "text/plain" */ 86218822Sdim STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */ 87218822Sdim} MIME_HEADER; 88218822Sdim 89218822SdimDECLARE_STACK_OF(MIME_HEADER) 90218822SdimIMPLEMENT_STACK_OF(MIME_HEADER) 91218822Sdim 92218822Sdimstatic int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, 93218822Sdim const ASN1_ITEM *it); 94218822Sdimstatic char *strip_ends(char *name); 95218822Sdimstatic char *strip_start(char *name); 96218822Sdimstatic char *strip_end(char *name); 97218822Sdimstatic MIME_HEADER *mime_hdr_new(char *name, char *value); 98218822Sdimstatic int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value); 99218822Sdimstatic STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio); 100218822Sdimstatic int mime_hdr_cmp(const MIME_HEADER *const *a, 101218822Sdim const MIME_HEADER *const *b); 102218822Sdimstatic int mime_param_cmp(const MIME_PARAM *const *a, 103218822Sdim const MIME_PARAM *const *b); 104218822Sdimstatic void mime_param_free(MIME_PARAM *param); 105218822Sdimstatic int mime_bound_check(char *line, int linelen, char *bound, int blen); 106218822Sdimstatic int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret); 107218822Sdimstatic int strip_eol(char *linebuf, int *plen); 108218822Sdimstatic MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name); 109218822Sdimstatic MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name); 110218822Sdimstatic void mime_hdr_free(MIME_HEADER *hdr); 111218822Sdim 112218822Sdim#define MAX_SMLEN 1024 113218822Sdim#define mime_debug(x) /* x */ 114218822Sdim 115218822Sdim/* Output an ASN1 structure in BER format streaming if necessary */ 116218822Sdim 117218822Sdimint i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, 118218822Sdim const ASN1_ITEM *it) 119218822Sdim{ 120218822Sdim /* If streaming create stream BIO and copy all content through it */ 121218822Sdim if (flags & SMIME_STREAM) { 122218822Sdim BIO *bio, *tbio; 123218822Sdim bio = BIO_new_NDEF(out, val, it); 124218822Sdim if (!bio) { 125218822Sdim ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE); 126218822Sdim return 0; 127218822Sdim } 128218822Sdim SMIME_crlf_copy(in, bio, flags); 129218822Sdim (void)BIO_flush(bio); 130218822Sdim /* Free up successive BIOs until we hit the old output BIO */ 131218822Sdim do { 132218822Sdim tbio = BIO_pop(bio); 133218822Sdim BIO_free(bio); 134218822Sdim bio = tbio; 135218822Sdim } while (bio != out); 136218822Sdim } 137218822Sdim /* 138218822Sdim * else just write out ASN1 structure which will have all content stored 139218822Sdim * internally 140218822Sdim */ 141218822Sdim else 142218822Sdim ASN1_item_i2d_bio(it, out, val); 143218822Sdim return 1; 144218822Sdim} 145218822Sdim 146218822Sdim/* Base 64 read and write of ASN1 structure */ 147218822Sdim 148218822Sdimstatic int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags, 149218822Sdim const ASN1_ITEM *it) 150218822Sdim{ 151218822Sdim BIO *b64; 152218822Sdim int r; 153218822Sdim b64 = BIO_new(BIO_f_base64()); 154218822Sdim if (!b64) { 155218822Sdim ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE); 156218822Sdim return 0; 157218822Sdim } 158218822Sdim /* 159218822Sdim * prepend the b64 BIO so all data is base64 encoded. 160218822Sdim */ 161218822Sdim out = BIO_push(b64, out); 162218822Sdim r = i2d_ASN1_bio_stream(out, val, in, flags, it); 163218822Sdim (void)BIO_flush(out); 164218822Sdim BIO_pop(out); 165218822Sdim BIO_free(b64); 166218822Sdim return r; 167218822Sdim} 168218822Sdim 169218822Sdim/* Streaming ASN1 PEM write */ 170218822Sdim 171218822Sdimint PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags, 172218822Sdim const char *hdr, const ASN1_ITEM *it) 173218822Sdim{ 174218822Sdim int r; 175218822Sdim BIO_printf(out, "-----BEGIN %s-----\n", hdr); 176218822Sdim r = B64_write_ASN1(out, val, in, flags, it); 177218822Sdim BIO_printf(out, "-----END %s-----\n", hdr); 178218822Sdim return r; 179218822Sdim} 180218822Sdim 181218822Sdimstatic ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it) 182218822Sdim{ 183218822Sdim BIO *b64; 184218822Sdim ASN1_VALUE *val; 185218822Sdim if (!(b64 = BIO_new(BIO_f_base64()))) { 186218822Sdim ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE); 187218822Sdim return 0; 188218822Sdim } 189218822Sdim bio = BIO_push(b64, bio); 190218822Sdim val = ASN1_item_d2i_bio(it, bio, NULL); 191218822Sdim if (!val) 192218822Sdim ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR); 193218822Sdim (void)BIO_flush(bio); 194218822Sdim bio = BIO_pop(bio); 195218822Sdim BIO_free(b64); 196218822Sdim return val; 197218822Sdim} 198218822Sdim 199218822Sdim/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */ 200218822Sdim 201218822Sdimstatic int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs) 202218822Sdim{ 203218822Sdim const EVP_MD *md; 204218822Sdim int i, have_unknown = 0, write_comma, ret = 0, md_nid; 205218822Sdim have_unknown = 0; 206218822Sdim write_comma = 0; 207218822Sdim for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) { 208218822Sdim if (write_comma) 209218822Sdim BIO_write(out, ",", 1); 210218822Sdim write_comma = 1; 211218822Sdim md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm); 212218822Sdim md = EVP_get_digestbynid(md_nid); 213218822Sdim if (md && md->md_ctrl) { 214218822Sdim int rv; 215218822Sdim char *micstr; 216218822Sdim rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr); 217218822Sdim if (rv > 0) { 218218822Sdim BIO_puts(out, micstr); 219218822Sdim OPENSSL_free(micstr); 220218822Sdim continue; 221218822Sdim } 222218822Sdim if (rv != -2) 223218822Sdim goto err; 224218822Sdim } 225218822Sdim switch (md_nid) { 226218822Sdim case NID_sha1: 227218822Sdim BIO_puts(out, "sha1"); 228218822Sdim break; 229218822Sdim 230218822Sdim case NID_md5: 231218822Sdim BIO_puts(out, "md5"); 232218822Sdim break; 233218822Sdim 234218822Sdim case NID_sha256: 235218822Sdim BIO_puts(out, "sha-256"); 236218822Sdim break; 237218822Sdim 238218822Sdim case NID_sha384: 239218822Sdim BIO_puts(out, "sha-384"); 240218822Sdim break; 241218822Sdim 242218822Sdim case NID_sha512: 243218822Sdim BIO_puts(out, "sha-512"); 244218822Sdim break; 245218822Sdim 246218822Sdim case NID_id_GostR3411_94: 247218822Sdim BIO_puts(out, "gostr3411-94"); 248218822Sdim goto err; 249218822Sdim break; 250218822Sdim 251218822Sdim default: 252218822Sdim if (have_unknown) 253218822Sdim write_comma = 0; 254218822Sdim else { 255218822Sdim BIO_puts(out, "unknown"); 256218822Sdim have_unknown = 1; 257218822Sdim } 258218822Sdim break; 259218822Sdim 260218822Sdim } 261218822Sdim } 262218822Sdim 263218822Sdim ret = 1; 264218822Sdim err: 265218822Sdim 266218822Sdim return ret; 267218822Sdim 268218822Sdim} 269218822Sdim 270218822Sdim/* SMIME sender */ 271218822Sdim 272218822Sdimint SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags, 273218822Sdim int ctype_nid, int econt_nid, 274218822Sdim STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it) 275218822Sdim{ 276218822Sdim char bound[33], c; 277218822Sdim int i; 278218822Sdim const char *mime_prefix, *mime_eol, *cname = "smime.p7m"; 279218822Sdim const char *msg_type = NULL; 280218822Sdim if (flags & SMIME_OLDMIME) 281218822Sdim mime_prefix = "application/x-pkcs7-"; 282218822Sdim else 283218822Sdim mime_prefix = "application/pkcs7-"; 284218822Sdim 285218822Sdim if (flags & SMIME_CRLFEOL) 286218822Sdim mime_eol = "\r\n"; 287218822Sdim else 288218822Sdim mime_eol = "\n"; 289218822Sdim if ((flags & SMIME_DETACHED) && data) { 290218822Sdim /* We want multipart/signed */ 291218822Sdim /* Generate a random boundary */ 292218822Sdim if (RAND_bytes((unsigned char *)bound, 32) <= 0) 293218822Sdim return 0; 294218822Sdim for (i = 0; i < 32; i++) { 295218822Sdim c = bound[i] & 0xf; 296218822Sdim if (c < 10) 297218822Sdim c += '0'; 298218822Sdim else 299218822Sdim c += 'A' - 10; 300218822Sdim bound[i] = c; 301218822Sdim } 302218822Sdim bound[32] = 0; 303218822Sdim BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); 304218822Sdim BIO_printf(bio, "Content-Type: multipart/signed;"); 305218822Sdim BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix); 306218822Sdim BIO_puts(bio, " micalg=\""); 307218822Sdim asn1_write_micalg(bio, mdalgs); 308218822Sdim BIO_printf(bio, "\"; boundary=\"----%s\"%s%s", 309218822Sdim bound, mime_eol, mime_eol); 310218822Sdim BIO_printf(bio, "This is an S/MIME signed message%s%s", 311218822Sdim mime_eol, mime_eol); 312218822Sdim /* Now write out the first part */ 313218822Sdim BIO_printf(bio, "------%s%s", bound, mime_eol); 314218822Sdim if (!asn1_output_data(bio, data, val, flags, it)) 315218822Sdim return 0; 316218822Sdim BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol); 317218822Sdim 318218822Sdim /* Headers for signature */ 319218822Sdim 320218822Sdim BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); 321218822Sdim BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol); 322218822Sdim BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol); 323218822Sdim BIO_printf(bio, "Content-Disposition: attachment;"); 324218822Sdim BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol); 325218822Sdim B64_write_ASN1(bio, val, NULL, 0, it); 326218822Sdim BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound, 327218822Sdim mime_eol, mime_eol); 328218822Sdim return 1; 329218822Sdim } 330218822Sdim 331218822Sdim /* Determine smime-type header */ 332218822Sdim 333218822Sdim if (ctype_nid == NID_pkcs7_enveloped) 334218822Sdim msg_type = "enveloped-data"; 335218822Sdim else if (ctype_nid == NID_pkcs7_signed) { 336218822Sdim if (econt_nid == NID_id_smime_ct_receipt) 337218822Sdim msg_type = "signed-receipt"; 338218822Sdim else if (sk_X509_ALGOR_num(mdalgs) >= 0) 339218822Sdim msg_type = "signed-data"; 340218822Sdim else 341218822Sdim msg_type = "certs-only"; 342218822Sdim } else if (ctype_nid == NID_id_smime_ct_compressedData) { 343218822Sdim msg_type = "compressed-data"; 344218822Sdim cname = "smime.p7z"; 345218822Sdim } 346218822Sdim /* MIME headers */ 347218822Sdim BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol); 348218822Sdim BIO_printf(bio, "Content-Disposition: attachment;"); 349218822Sdim BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol); 350218822Sdim BIO_printf(bio, "Content-Type: %smime;", mime_prefix); 351218822Sdim if (msg_type) 352218822Sdim BIO_printf(bio, " smime-type=%s;", msg_type); 353218822Sdim BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol); 354218822Sdim BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s", 355218822Sdim mime_eol, mime_eol); 356218822Sdim if (!B64_write_ASN1(bio, val, data, flags, it)) 357218822Sdim return 0; 358218822Sdim BIO_printf(bio, "%s", mime_eol); 359218822Sdim return 1; 360218822Sdim} 361218822Sdim 362218822Sdim/* Handle output of ASN1 data */ 363218822Sdim 364218822Sdimstatic int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags, 365218822Sdim const ASN1_ITEM *it) 366218822Sdim{ 367218822Sdim BIO *tmpbio; 368218822Sdim const ASN1_AUX *aux = it->funcs; 369218822Sdim ASN1_STREAM_ARG sarg; 370218822Sdim int rv = 1; 371218822Sdim 372218822Sdim /* 373218822Sdim * If data is not deteched or resigning then the output BIO is already 374218822Sdim * set up to finalise when it is written through. 375218822Sdim */ 376218822Sdim if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) { 377218822Sdim SMIME_crlf_copy(data, out, flags); 378218822Sdim return 1; 379218822Sdim } 380218822Sdim 381218822Sdim if (!aux || !aux->asn1_cb) { 382218822Sdim ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED); 383218822Sdim return 0; 384218822Sdim } 385218822Sdim 386218822Sdim sarg.out = out; 387218822Sdim sarg.ndef_bio = NULL; 388218822Sdim sarg.boundary = NULL; 389218822Sdim 390218822Sdim /* Let ASN1 code prepend any needed BIOs */ 391218822Sdim 392218822Sdim if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0) 393218822Sdim return 0; 394218822Sdim 395218822Sdim /* Copy data across, passing through filter BIOs for processing */ 396218822Sdim SMIME_crlf_copy(data, sarg.ndef_bio, flags); 397218822Sdim 398218822Sdim /* Finalize structure */ 399218822Sdim if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0) 400218822Sdim rv = 0; 401218822Sdim 402218822Sdim /* Now remove any digests prepended to the BIO */ 403218822Sdim 404218822Sdim while (sarg.ndef_bio != out) { 405218822Sdim tmpbio = BIO_pop(sarg.ndef_bio); 406218822Sdim BIO_free(sarg.ndef_bio); 407218822Sdim sarg.ndef_bio = tmpbio; 408218822Sdim } 409218822Sdim 410218822Sdim return rv; 411218822Sdim 412218822Sdim} 413218822Sdim 414218822Sdim/* 415218822Sdim * SMIME reader: handle multipart/signed and opaque signing. in multipart 416218822Sdim * case the content is placed in a memory BIO pointed to by "bcont". In 417218822Sdim * opaque this is set to NULL 418218822Sdim */ 419218822Sdim 420218822SdimASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it) 421218822Sdim{ 422218822Sdim BIO *asnin; 423218822Sdim STACK_OF(MIME_HEADER) *headers = NULL; 424218822Sdim STACK_OF(BIO) *parts = NULL; 425218822Sdim MIME_HEADER *hdr; 426218822Sdim MIME_PARAM *prm; 427218822Sdim ASN1_VALUE *val; 428218822Sdim int ret; 429218822Sdim 430218822Sdim if (bcont) 431218822Sdim *bcont = NULL; 432218822Sdim 433218822Sdim if (!(headers = mime_parse_hdr(bio))) { 434218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR); 435218822Sdim return NULL; 436218822Sdim } 437218822Sdim 438218822Sdim if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 439218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 440218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE); 441218822Sdim return NULL; 442218822Sdim } 443218822Sdim 444218822Sdim /* Handle multipart/signed */ 445218822Sdim 446218822Sdim if (!strcmp(hdr->value, "multipart/signed")) { 447218822Sdim /* Split into two parts */ 448218822Sdim prm = mime_param_find(hdr, "boundary"); 449218822Sdim if (!prm || !prm->param_value) { 450218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 451218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY); 452218822Sdim return NULL; 453218822Sdim } 454218822Sdim ret = multi_split(bio, prm->param_value, &parts); 455218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 456218822Sdim if (!ret || (sk_BIO_num(parts) != 2)) { 457218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE); 458218822Sdim sk_BIO_pop_free(parts, BIO_vfree); 459218822Sdim return NULL; 460218822Sdim } 461218822Sdim 462218822Sdim /* Parse the signature piece */ 463218822Sdim asnin = sk_BIO_value(parts, 1); 464218822Sdim 465218822Sdim if (!(headers = mime_parse_hdr(asnin))) { 466218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR); 467218822Sdim sk_BIO_pop_free(parts, BIO_vfree); 468218822Sdim return NULL; 469218822Sdim } 470218822Sdim 471218822Sdim /* Get content type */ 472218822Sdim 473218822Sdim if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 474218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 475218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE); 476218822Sdim sk_BIO_pop_free(parts, BIO_vfree); 477218822Sdim return NULL; 478218822Sdim } 479218822Sdim 480218822Sdim if (strcmp(hdr->value, "application/x-pkcs7-signature") && 481218822Sdim strcmp(hdr->value, "application/pkcs7-signature")) { 482218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE); 483218822Sdim ERR_add_error_data(2, "type: ", hdr->value); 484218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 485218822Sdim sk_BIO_pop_free(parts, BIO_vfree); 486218822Sdim return NULL; 487218822Sdim } 488218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 489218822Sdim /* Read in ASN1 */ 490218822Sdim if (!(val = b64_read_asn1(asnin, it))) { 491218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR); 492218822Sdim sk_BIO_pop_free(parts, BIO_vfree); 493218822Sdim return NULL; 494218822Sdim } 495218822Sdim 496218822Sdim if (bcont) { 497218822Sdim *bcont = sk_BIO_value(parts, 0); 498218822Sdim BIO_free(asnin); 499218822Sdim sk_BIO_free(parts); 500218822Sdim } else 501218822Sdim sk_BIO_pop_free(parts, BIO_vfree); 502218822Sdim return val; 503218822Sdim } 504218822Sdim 505218822Sdim /* OK, if not multipart/signed try opaque signature */ 506218822Sdim 507218822Sdim if (strcmp(hdr->value, "application/x-pkcs7-mime") && 508218822Sdim strcmp(hdr->value, "application/pkcs7-mime")) { 509218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE); 510218822Sdim ERR_add_error_data(2, "type: ", hdr->value); 511218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 512218822Sdim return NULL; 513218822Sdim } 514218822Sdim 515218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 516218822Sdim 517218822Sdim if (!(val = b64_read_asn1(bio, it))) { 518218822Sdim ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR); 519218822Sdim return NULL; 520218822Sdim } 521218822Sdim return val; 522218822Sdim 523218822Sdim} 524218822Sdim 525218822Sdim/* Copy text from one BIO to another making the output CRLF at EOL */ 526218822Sdimint SMIME_crlf_copy(BIO *in, BIO *out, int flags) 527218822Sdim{ 528218822Sdim BIO *bf; 529218822Sdim char eol; 530218822Sdim int len; 531218822Sdim char linebuf[MAX_SMLEN]; 532218822Sdim /* 533218822Sdim * Buffer output so we don't write one line at a time. This is useful 534218822Sdim * when streaming as we don't end up with one OCTET STRING per line. 535218822Sdim */ 536218822Sdim bf = BIO_new(BIO_f_buffer()); 537218822Sdim if (!bf) 538218822Sdim return 0; 539218822Sdim out = BIO_push(bf, out); 540218822Sdim if (flags & SMIME_BINARY) { 541218822Sdim while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0) 542218822Sdim BIO_write(out, linebuf, len); 543218822Sdim } else { 544218822Sdim if (flags & SMIME_TEXT) 545218822Sdim BIO_printf(out, "Content-Type: text/plain\r\n\r\n"); 546218822Sdim while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) { 547218822Sdim eol = strip_eol(linebuf, &len); 548218822Sdim if (len) 549218822Sdim BIO_write(out, linebuf, len); 550218822Sdim if (eol) 551218822Sdim BIO_write(out, "\r\n", 2); 552218822Sdim } 553218822Sdim } 554218822Sdim (void)BIO_flush(out); 555218822Sdim BIO_pop(out); 556218822Sdim BIO_free(bf); 557218822Sdim return 1; 558218822Sdim} 559218822Sdim 560218822Sdim/* Strip off headers if they are text/plain */ 561218822Sdimint SMIME_text(BIO *in, BIO *out) 562218822Sdim{ 563218822Sdim char iobuf[4096]; 564218822Sdim int len; 565218822Sdim STACK_OF(MIME_HEADER) *headers; 566218822Sdim MIME_HEADER *hdr; 567218822Sdim 568218822Sdim if (!(headers = mime_parse_hdr(in))) { 569218822Sdim ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR); 570218822Sdim return 0; 571218822Sdim } 572218822Sdim if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) { 573218822Sdim ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE); 574218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 575218822Sdim return 0; 576218822Sdim } 577218822Sdim if (strcmp(hdr->value, "text/plain")) { 578218822Sdim ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE); 579218822Sdim ERR_add_error_data(2, "type: ", hdr->value); 580218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 581218822Sdim return 0; 582218822Sdim } 583218822Sdim sk_MIME_HEADER_pop_free(headers, mime_hdr_free); 584218822Sdim while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0) 585218822Sdim BIO_write(out, iobuf, len); 586218822Sdim if (len < 0) 587218822Sdim return 0; 588218822Sdim return 1; 589218822Sdim} 590218822Sdim 591218822Sdim/* 592218822Sdim * Split a multipart/XXX message body into component parts: result is 593218822Sdim * canonical parts in a STACK of bios 594218822Sdim */ 595218822Sdim 596218822Sdimstatic int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret) 597218822Sdim{ 598218822Sdim char linebuf[MAX_SMLEN]; 599218822Sdim int len, blen; 600218822Sdim int eol = 0, next_eol = 0; 601218822Sdim BIO *bpart = NULL; 602218822Sdim STACK_OF(BIO) *parts; 603218822Sdim char state, part, first; 604218822Sdim 605218822Sdim blen = strlen(bound); 606218822Sdim part = 0; 607218822Sdim state = 0; 608218822Sdim first = 1; 609218822Sdim parts = sk_BIO_new_null(); 610218822Sdim *ret = parts; 611218822Sdim while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { 612218822Sdim state = mime_bound_check(linebuf, len, bound, blen); 613218822Sdim if (state == 1) { 614218822Sdim first = 1; 615218822Sdim part++; 616218822Sdim } else if (state == 2) { 617218822Sdim sk_BIO_push(parts, bpart); 618218822Sdim return 1; 619218822Sdim } else if (part) { 620218822Sdim /* Strip CR+LF from linebuf */ 621218822Sdim next_eol = strip_eol(linebuf, &len); 622218822Sdim if (first) { 623218822Sdim first = 0; 624218822Sdim if (bpart) 625218822Sdim sk_BIO_push(parts, bpart); 626218822Sdim bpart = BIO_new(BIO_s_mem()); 627218822Sdim if (bpart == NULL) 628218822Sdim return 1; 629218822Sdim BIO_set_mem_eof_return(bpart, 0); 630218822Sdim } else if (eol) 631218822Sdim BIO_write(bpart, "\r\n", 2); 632218822Sdim eol = next_eol; 633218822Sdim if (len) 634218822Sdim BIO_write(bpart, linebuf, len); 635218822Sdim } 636218822Sdim } 637218822Sdim return 0; 638218822Sdim} 639218822Sdim 640218822Sdim/* This is the big one: parse MIME header lines up to message body */ 641218822Sdim 642218822Sdim#define MIME_INVALID 0 643218822Sdim#define MIME_START 1 644218822Sdim#define MIME_TYPE 2 645218822Sdim#define MIME_NAME 3 646218822Sdim#define MIME_VALUE 4 647218822Sdim#define MIME_QUOTE 5 648218822Sdim#define MIME_COMMENT 6 649218822Sdim 650218822Sdimstatic STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio) 651218822Sdim{ 652218822Sdim char *p, *q, c; 653218822Sdim char *ntmp; 654218822Sdim char linebuf[MAX_SMLEN]; 655218822Sdim MIME_HEADER *mhdr = NULL; 656218822Sdim STACK_OF(MIME_HEADER) *headers; 657218822Sdim int len, state, save_state = 0; 658218822Sdim 659218822Sdim headers = sk_MIME_HEADER_new(mime_hdr_cmp); 660218822Sdim if (!headers) 661218822Sdim return NULL; 662218822Sdim while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) { 663218822Sdim /* If whitespace at line start then continuation line */ 664218822Sdim if (mhdr && isspace((unsigned char)linebuf[0])) 665218822Sdim state = MIME_NAME; 666218822Sdim else 667218822Sdim state = MIME_START; 668218822Sdim ntmp = NULL; 669218822Sdim /* Go through all characters */ 670218822Sdim for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n'); 671218822Sdim p++) { 672218822Sdim 673218822Sdim /* 674218822Sdim * State machine to handle MIME headers if this looks horrible 675218822Sdim * that's because it *is* 676218822Sdim */ 677218822Sdim 678218822Sdim switch (state) { 679218822Sdim case MIME_START: 680218822Sdim if (c == ':') { 681218822Sdim state = MIME_TYPE; 682218822Sdim *p = 0; 683218822Sdim ntmp = strip_ends(q); 684218822Sdim q = p + 1; 685218822Sdim } 686218822Sdim break; 687218822Sdim 688218822Sdim case MIME_TYPE: 689218822Sdim if (c == ';') { 690218822Sdim mime_debug("Found End Value\n"); 691218822Sdim *p = 0; 692218822Sdim mhdr = mime_hdr_new(ntmp, strip_ends(q)); 693218822Sdim sk_MIME_HEADER_push(headers, mhdr); 694218822Sdim ntmp = NULL; 695218822Sdim q = p + 1; 696218822Sdim state = MIME_NAME; 697218822Sdim } else if (c == '(') { 698218822Sdim save_state = state; 699218822Sdim state = MIME_COMMENT; 700218822Sdim } 701218822Sdim break; 702218822Sdim 703218822Sdim case MIME_COMMENT: 704218822Sdim if (c == ')') { 705218822Sdim state = save_state; 706218822Sdim } 707218822Sdim break; 708218822Sdim 709218822Sdim case MIME_NAME: 710218822Sdim if (c == '=') { 711218822Sdim state = MIME_VALUE; 712218822Sdim *p = 0; 713218822Sdim ntmp = strip_ends(q); 714218822Sdim q = p + 1; 715218822Sdim } 716218822Sdim break; 717218822Sdim 718218822Sdim case MIME_VALUE: 719218822Sdim if (c == ';') { 720218822Sdim state = MIME_NAME; 721218822Sdim *p = 0; 722218822Sdim mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); 723218822Sdim ntmp = NULL; 724218822Sdim q = p + 1; 725218822Sdim } else if (c == '"') { 726218822Sdim mime_debug("Found Quote\n"); 727218822Sdim state = MIME_QUOTE; 728218822Sdim } else if (c == '(') { 729218822Sdim save_state = state; 730218822Sdim state = MIME_COMMENT; 731218822Sdim } 732218822Sdim break; 733218822Sdim 734218822Sdim case MIME_QUOTE: 735218822Sdim if (c == '"') { 736218822Sdim mime_debug("Found Match Quote\n"); 737218822Sdim state = MIME_VALUE; 738218822Sdim } 739218822Sdim break; 740218822Sdim } 741218822Sdim } 742218822Sdim 743218822Sdim if (state == MIME_TYPE) { 744218822Sdim mhdr = mime_hdr_new(ntmp, strip_ends(q)); 745218822Sdim sk_MIME_HEADER_push(headers, mhdr); 746218822Sdim } else if (state == MIME_VALUE) 747218822Sdim mime_hdr_addparam(mhdr, ntmp, strip_ends(q)); 748218822Sdim if (p == linebuf) 749218822Sdim break; /* Blank line means end of headers */ 750218822Sdim } 751218822Sdim 752218822Sdim return headers; 753218822Sdim 754218822Sdim} 755218822Sdim 756218822Sdimstatic char *strip_ends(char *name) 757218822Sdim{ 758218822Sdim return strip_end(strip_start(name)); 759218822Sdim} 760218822Sdim 761218822Sdim/* Strip a parameter of whitespace from start of param */ 762218822Sdimstatic char *strip_start(char *name) 763218822Sdim{ 764218822Sdim char *p, c; 765218822Sdim /* Look for first non white space or quote */ 766218822Sdim for (p = name; (c = *p); p++) { 767218822Sdim if (c == '"') { 768218822Sdim /* Next char is start of string if non null */ 769218822Sdim if (p[1]) 770218822Sdim return p + 1; 771218822Sdim /* Else null string */ 772218822Sdim return NULL; 773218822Sdim } 774218822Sdim if (!isspace((unsigned char)c)) 775218822Sdim return p; 776218822Sdim } 777218822Sdim return NULL; 778218822Sdim} 779218822Sdim 780218822Sdim/* As above but strip from end of string : maybe should handle brackets? */ 781218822Sdimstatic char *strip_end(char *name) 782218822Sdim{ 783218822Sdim char *p, c; 784218822Sdim if (!name) 785218822Sdim return NULL; 786218822Sdim /* Look for first non white space or quote */ 787218822Sdim for (p = name + strlen(name) - 1; p >= name; p--) { 788218822Sdim c = *p; 789218822Sdim if (c == '"') { 790218822Sdim if (p - 1 == name) 791218822Sdim return NULL; 792218822Sdim *p = 0; 793218822Sdim return name; 794218822Sdim } 795218822Sdim if (isspace((unsigned char)c)) 796218822Sdim *p = 0; 797218822Sdim else 798218822Sdim return name; 799218822Sdim } 800218822Sdim return NULL; 801218822Sdim} 802218822Sdim 803218822Sdimstatic MIME_HEADER *mime_hdr_new(char *name, char *value) 804218822Sdim{ 805218822Sdim MIME_HEADER *mhdr; 806218822Sdim char *tmpname, *tmpval, *p; 807218822Sdim int c; 808218822Sdim if (name) { 809218822Sdim if (!(tmpname = BUF_strdup(name))) 810218822Sdim return NULL; 811218822Sdim for (p = tmpname; *p; p++) { 812218822Sdim c = (unsigned char)*p; 813218822Sdim if (isupper(c)) { 814218822Sdim c = tolower(c); 815218822Sdim *p = c; 816218822Sdim } 817218822Sdim } 818218822Sdim } else 819218822Sdim tmpname = NULL; 820218822Sdim if (value) { 821218822Sdim if (!(tmpval = BUF_strdup(value))) 822218822Sdim return NULL; 823218822Sdim for (p = tmpval; *p; p++) { 824218822Sdim c = (unsigned char)*p; 825218822Sdim if (isupper(c)) { 826218822Sdim c = tolower(c); 827218822Sdim *p = c; 828218822Sdim } 829218822Sdim } 830218822Sdim } else 831218822Sdim tmpval = NULL; 832218822Sdim mhdr = (MIME_HEADER *)OPENSSL_malloc(sizeof(MIME_HEADER)); 833218822Sdim if (!mhdr) 834218822Sdim return NULL; 835218822Sdim mhdr->name = tmpname; 836218822Sdim mhdr->value = tmpval; 837218822Sdim if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) 838218822Sdim return NULL; 839218822Sdim return mhdr; 840218822Sdim} 841218822Sdim 842218822Sdimstatic int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value) 843218822Sdim{ 844218822Sdim char *tmpname, *tmpval, *p; 845218822Sdim int c; 846218822Sdim MIME_PARAM *mparam; 847218822Sdim if (name) { 848218822Sdim tmpname = BUF_strdup(name); 849218822Sdim if (!tmpname) 850218822Sdim return 0; 851218822Sdim for (p = tmpname; *p; p++) { 852218822Sdim c = (unsigned char)*p; 853218822Sdim if (isupper(c)) { 854218822Sdim c = tolower(c); 855218822Sdim *p = c; 856218822Sdim } 857218822Sdim } 858218822Sdim } else 859218822Sdim tmpname = NULL; 860218822Sdim if (value) { 861218822Sdim tmpval = BUF_strdup(value); 862218822Sdim if (!tmpval) 863218822Sdim return 0; 864218822Sdim } else 865218822Sdim tmpval = NULL; 866218822Sdim /* Parameter values are case sensitive so leave as is */ 867218822Sdim mparam = (MIME_PARAM *)OPENSSL_malloc(sizeof(MIME_PARAM)); 868218822Sdim if (!mparam) 869218822Sdim return 0; 870218822Sdim mparam->param_name = tmpname; 871218822Sdim mparam->param_value = tmpval; 872218822Sdim sk_MIME_PARAM_push(mhdr->params, mparam); 873218822Sdim return 1; 874218822Sdim} 875218822Sdim 876218822Sdimstatic int mime_hdr_cmp(const MIME_HEADER *const *a, 877218822Sdim const MIME_HEADER *const *b) 878218822Sdim{ 879218822Sdim if (!(*a)->name || !(*b)->name) 880218822Sdim return ! !(*a)->name - ! !(*b)->name; 881218822Sdim 882218822Sdim return (strcmp((*a)->name, (*b)->name)); 883218822Sdim} 884218822Sdim 885218822Sdimstatic int mime_param_cmp(const MIME_PARAM *const *a, 886218822Sdim const MIME_PARAM *const *b) 887218822Sdim{ 888218822Sdim if (!(*a)->param_name || !(*b)->param_name) 889218822Sdim return ! !(*a)->param_name - ! !(*b)->param_name; 890218822Sdim return (strcmp((*a)->param_name, (*b)->param_name)); 891218822Sdim} 892218822Sdim 893218822Sdim/* Find a header with a given name (if possible) */ 894218822Sdim 895218822Sdimstatic MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name) 896218822Sdim{ 897218822Sdim MIME_HEADER htmp; 898218822Sdim int idx; 899218822Sdim htmp.name = name; 900218822Sdim idx = sk_MIME_HEADER_find(hdrs, &htmp); 901218822Sdim if (idx < 0) 902218822Sdim return NULL; 903218822Sdim return sk_MIME_HEADER_value(hdrs, idx); 904218822Sdim} 905218822Sdim 906218822Sdimstatic MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name) 907218822Sdim{ 908218822Sdim MIME_PARAM param; 909218822Sdim int idx; 910218822Sdim param.param_name = name; 911218822Sdim idx = sk_MIME_PARAM_find(hdr->params, ¶m); 912218822Sdim if (idx < 0) 913218822Sdim return NULL; 914218822Sdim return sk_MIME_PARAM_value(hdr->params, idx); 915218822Sdim} 916218822Sdim 917218822Sdimstatic void mime_hdr_free(MIME_HEADER *hdr) 918218822Sdim{ 919218822Sdim if (hdr->name) 920218822Sdim OPENSSL_free(hdr->name); 921218822Sdim if (hdr->value) 922218822Sdim OPENSSL_free(hdr->value); 923218822Sdim if (hdr->params) 924218822Sdim sk_MIME_PARAM_pop_free(hdr->params, mime_param_free); 925218822Sdim OPENSSL_free(hdr); 926218822Sdim} 927218822Sdim 928218822Sdimstatic void mime_param_free(MIME_PARAM *param) 929218822Sdim{ 930218822Sdim if (param->param_name) 931218822Sdim OPENSSL_free(param->param_name); 932218822Sdim if (param->param_value) 933218822Sdim OPENSSL_free(param->param_value); 934218822Sdim OPENSSL_free(param); 935218822Sdim} 936218822Sdim 937218822Sdim/*- 938218822Sdim * Check for a multipart boundary. Returns: 939218822Sdim * 0 : no boundary 940218822Sdim * 1 : part boundary 941218822Sdim * 2 : final boundary 942218822Sdim */ 943218822Sdimstatic int mime_bound_check(char *line, int linelen, char *bound, int blen) 944218822Sdim{ 945218822Sdim if (linelen == -1) 946218822Sdim linelen = strlen(line); 947218822Sdim if (blen == -1) 948218822Sdim blen = strlen(bound); 949218822Sdim /* Quickly eliminate if line length too short */ 950218822Sdim if (blen + 2 > linelen) 951218822Sdim return 0; 952218822Sdim /* Check for part boundary */ 953218822Sdim if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) { 954218822Sdim if (!strncmp(line + blen + 2, "--", 2)) 955218822Sdim return 2; 956218822Sdim else 957218822Sdim return 1; 958218822Sdim } 959218822Sdim return 0; 960218822Sdim} 961218822Sdim 962218822Sdimstatic int strip_eol(char *linebuf, int *plen) 963218822Sdim{ 964218822Sdim int len = *plen; 965218822Sdim char *p, c; 966218822Sdim int is_eol = 0; 967218822Sdim p = linebuf + len - 1; 968218822Sdim for (p = linebuf + len - 1; len > 0; len--, p--) { 969218822Sdim c = *p; 970218822Sdim if (c == '\n') 971218822Sdim is_eol = 1; 972218822Sdim else if (c != '\r') 973218822Sdim break; 974218822Sdim } 975218822Sdim *plen = len; 976218822Sdim return is_eol; 977218822Sdim} 978218822Sdim