978 lines
29 KiB
C
978 lines
29 KiB
C
/* asn_mime.c */
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/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2018 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include "cryptlib.h"
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#include <openssl/rand.h>
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#include <openssl/x509.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include "asn1_locl.h"
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/*
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* Generalised MIME like utilities for streaming ASN1. Although many have a
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* PKCS7/CMS like flavour others are more general purpose.
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*/
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/*
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* MIME format structures Note that all are translated to lower case apart
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* from parameter values. Quotes are stripped off
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*/
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typedef struct {
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char *param_name; /* Param name e.g. "micalg" */
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char *param_value; /* Param value e.g. "sha1" */
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} MIME_PARAM;
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DECLARE_STACK_OF(MIME_PARAM)
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IMPLEMENT_STACK_OF(MIME_PARAM)
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typedef struct {
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char *name; /* Name of line e.g. "content-type" */
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char *value; /* Value of line e.g. "text/plain" */
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STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
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} MIME_HEADER;
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DECLARE_STACK_OF(MIME_HEADER)
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IMPLEMENT_STACK_OF(MIME_HEADER)
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static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
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const ASN1_ITEM *it);
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static char *strip_ends(char *name);
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static char *strip_start(char *name);
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static char *strip_end(char *name);
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static MIME_HEADER *mime_hdr_new(char *name, char *value);
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static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
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static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
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static int mime_hdr_cmp(const MIME_HEADER *const *a,
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const MIME_HEADER *const *b);
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static int mime_param_cmp(const MIME_PARAM *const *a,
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const MIME_PARAM *const *b);
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static void mime_param_free(MIME_PARAM *param);
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static int mime_bound_check(char *line, int linelen, char *bound, int blen);
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static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
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static int strip_eol(char *linebuf, int *plen);
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static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
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static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
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static void mime_hdr_free(MIME_HEADER *hdr);
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#define MAX_SMLEN 1024
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#define mime_debug(x) /* x */
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/* Output an ASN1 structure in BER format streaming if necessary */
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int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
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const ASN1_ITEM *it)
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{
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/* If streaming create stream BIO and copy all content through it */
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if (flags & SMIME_STREAM) {
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BIO *bio, *tbio;
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bio = BIO_new_NDEF(out, val, it);
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if (!bio) {
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ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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SMIME_crlf_copy(in, bio, flags);
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(void)BIO_flush(bio);
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/* Free up successive BIOs until we hit the old output BIO */
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do {
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tbio = BIO_pop(bio);
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BIO_free(bio);
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bio = tbio;
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} while (bio != out);
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}
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/*
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* else just write out ASN1 structure which will have all content stored
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* internally
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*/
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else
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ASN1_item_i2d_bio(it, out, val);
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return 1;
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}
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/* Base 64 read and write of ASN1 structure */
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static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
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const ASN1_ITEM *it)
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{
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BIO *b64;
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int r;
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b64 = BIO_new(BIO_f_base64());
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if (!b64) {
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ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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/*
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* prepend the b64 BIO so all data is base64 encoded.
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*/
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out = BIO_push(b64, out);
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r = i2d_ASN1_bio_stream(out, val, in, flags, it);
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(void)BIO_flush(out);
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BIO_pop(out);
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BIO_free(b64);
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return r;
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}
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/* Streaming ASN1 PEM write */
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int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
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const char *hdr, const ASN1_ITEM *it)
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{
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int r;
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BIO_printf(out, "-----BEGIN %s-----\n", hdr);
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r = B64_write_ASN1(out, val, in, flags, it);
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BIO_printf(out, "-----END %s-----\n", hdr);
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return r;
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}
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static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
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{
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BIO *b64;
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ASN1_VALUE *val;
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if (!(b64 = BIO_new(BIO_f_base64()))) {
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ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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bio = BIO_push(b64, bio);
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val = ASN1_item_d2i_bio(it, bio, NULL);
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if (!val)
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ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
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(void)BIO_flush(bio);
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bio = BIO_pop(bio);
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BIO_free(b64);
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return val;
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}
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/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
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static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
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{
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const EVP_MD *md;
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int i, have_unknown = 0, write_comma, ret = 0, md_nid;
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have_unknown = 0;
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write_comma = 0;
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for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
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if (write_comma)
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BIO_write(out, ",", 1);
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write_comma = 1;
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md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
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md = EVP_get_digestbynid(md_nid);
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if (md && md->md_ctrl) {
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int rv;
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char *micstr;
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rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
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if (rv > 0) {
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BIO_puts(out, micstr);
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OPENSSL_free(micstr);
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continue;
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}
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if (rv != -2)
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goto err;
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}
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switch (md_nid) {
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case NID_sha1:
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BIO_puts(out, "sha1");
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break;
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case NID_md5:
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BIO_puts(out, "md5");
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break;
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case NID_sha256:
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BIO_puts(out, "sha-256");
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break;
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case NID_sha384:
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BIO_puts(out, "sha-384");
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break;
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case NID_sha512:
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BIO_puts(out, "sha-512");
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break;
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case NID_id_GostR3411_94:
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BIO_puts(out, "gostr3411-94");
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goto err;
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break;
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default:
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if (have_unknown)
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write_comma = 0;
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else {
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BIO_puts(out, "unknown");
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have_unknown = 1;
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}
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break;
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}
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}
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ret = 1;
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err:
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return ret;
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}
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/* SMIME sender */
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int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
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int ctype_nid, int econt_nid,
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STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
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{
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char bound[33], c;
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int i;
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const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
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const char *msg_type = NULL;
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if (flags & SMIME_OLDMIME)
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mime_prefix = "application/x-pkcs7-";
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else
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mime_prefix = "application/pkcs7-";
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if (flags & SMIME_CRLFEOL)
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mime_eol = "\r\n";
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else
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mime_eol = "\n";
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if ((flags & SMIME_DETACHED) && data) {
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/* We want multipart/signed */
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/* Generate a random boundary */
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if (RAND_bytes((unsigned char *)bound, 32) <= 0)
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return 0;
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for (i = 0; i < 32; i++) {
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c = bound[i] & 0xf;
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if (c < 10)
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c += '0';
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else
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c += 'A' - 10;
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bound[i] = c;
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}
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bound[32] = 0;
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BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
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BIO_printf(bio, "Content-Type: multipart/signed;");
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BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
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BIO_puts(bio, " micalg=\"");
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asn1_write_micalg(bio, mdalgs);
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BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
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bound, mime_eol, mime_eol);
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BIO_printf(bio, "This is an S/MIME signed message%s%s",
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mime_eol, mime_eol);
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/* Now write out the first part */
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BIO_printf(bio, "------%s%s", bound, mime_eol);
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if (!asn1_output_data(bio, data, val, flags, it))
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return 0;
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BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
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/* Headers for signature */
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BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
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BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
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BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
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BIO_printf(bio, "Content-Disposition: attachment;");
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BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
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B64_write_ASN1(bio, val, NULL, 0, it);
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BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
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mime_eol, mime_eol);
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return 1;
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}
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/* Determine smime-type header */
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if (ctype_nid == NID_pkcs7_enveloped)
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msg_type = "enveloped-data";
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else if (ctype_nid == NID_pkcs7_signed) {
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if (econt_nid == NID_id_smime_ct_receipt)
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msg_type = "signed-receipt";
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else if (sk_X509_ALGOR_num(mdalgs) >= 0)
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msg_type = "signed-data";
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else
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msg_type = "certs-only";
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} else if (ctype_nid == NID_id_smime_ct_compressedData) {
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msg_type = "compressed-data";
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cname = "smime.p7z";
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}
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/* MIME headers */
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BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
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BIO_printf(bio, "Content-Disposition: attachment;");
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BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
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BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
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if (msg_type)
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BIO_printf(bio, " smime-type=%s;", msg_type);
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BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
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BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
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mime_eol, mime_eol);
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if (!B64_write_ASN1(bio, val, data, flags, it))
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return 0;
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BIO_printf(bio, "%s", mime_eol);
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return 1;
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}
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/* Handle output of ASN1 data */
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static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
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const ASN1_ITEM *it)
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{
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BIO *tmpbio;
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const ASN1_AUX *aux = it->funcs;
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ASN1_STREAM_ARG sarg;
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int rv = 1;
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/*
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* If data is not deteched or resigning then the output BIO is already
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* set up to finalise when it is written through.
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*/
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if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
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SMIME_crlf_copy(data, out, flags);
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return 1;
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}
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if (!aux || !aux->asn1_cb) {
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ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED);
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return 0;
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}
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sarg.out = out;
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sarg.ndef_bio = NULL;
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sarg.boundary = NULL;
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/* Let ASN1 code prepend any needed BIOs */
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if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
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return 0;
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/* Copy data across, passing through filter BIOs for processing */
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SMIME_crlf_copy(data, sarg.ndef_bio, flags);
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/* Finalize structure */
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if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
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rv = 0;
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/* Now remove any digests prepended to the BIO */
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while (sarg.ndef_bio != out) {
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tmpbio = BIO_pop(sarg.ndef_bio);
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BIO_free(sarg.ndef_bio);
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sarg.ndef_bio = tmpbio;
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}
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return rv;
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}
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/*
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* SMIME reader: handle multipart/signed and opaque signing. in multipart
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* case the content is placed in a memory BIO pointed to by "bcont". In
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* opaque this is set to NULL
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*/
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ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
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{
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BIO *asnin;
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STACK_OF(MIME_HEADER) *headers = NULL;
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STACK_OF(BIO) *parts = NULL;
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MIME_HEADER *hdr;
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MIME_PARAM *prm;
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ASN1_VALUE *val;
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int ret;
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if (bcont)
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*bcont = NULL;
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if (!(headers = mime_parse_hdr(bio))) {
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ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
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return NULL;
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}
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if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
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sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
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return NULL;
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}
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/* Handle multipart/signed */
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if (!strcmp(hdr->value, "multipart/signed")) {
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/* Split into two parts */
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prm = mime_param_find(hdr, "boundary");
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if (!prm || !prm->param_value) {
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sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
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return NULL;
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}
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ret = multi_split(bio, prm->param_value, &parts);
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sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
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if (!ret || (sk_BIO_num(parts) != 2)) {
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ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
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sk_BIO_pop_free(parts, BIO_vfree);
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return NULL;
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}
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/* Parse the signature piece */
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asnin = sk_BIO_value(parts, 1);
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if (!(headers = mime_parse_hdr(asnin))) {
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ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
|
|
sk_BIO_pop_free(parts, BIO_vfree);
|
|
return NULL;
|
|
}
|
|
|
|
/* Get content type */
|
|
|
|
if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
|
|
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
|
ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
|
|
sk_BIO_pop_free(parts, BIO_vfree);
|
|
return NULL;
|
|
}
|
|
|
|
if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
|
|
strcmp(hdr->value, "application/pkcs7-signature")) {
|
|
ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE);
|
|
ERR_add_error_data(2, "type: ", hdr->value);
|
|
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
|
sk_BIO_pop_free(parts, BIO_vfree);
|
|
return NULL;
|
|
}
|
|
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
|
/* Read in ASN1 */
|
|
if (!(val = b64_read_asn1(asnin, it))) {
|
|
ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
|
|
sk_BIO_pop_free(parts, BIO_vfree);
|
|
return NULL;
|
|
}
|
|
|
|
if (bcont) {
|
|
*bcont = sk_BIO_value(parts, 0);
|
|
BIO_free(asnin);
|
|
sk_BIO_free(parts);
|
|
} else
|
|
sk_BIO_pop_free(parts, BIO_vfree);
|
|
return val;
|
|
}
|
|
|
|
/* OK, if not multipart/signed try opaque signature */
|
|
|
|
if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
|
|
strcmp(hdr->value, "application/pkcs7-mime")) {
|
|
ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE);
|
|
ERR_add_error_data(2, "type: ", hdr->value);
|
|
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
|
return NULL;
|
|
}
|
|
|
|
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
|
|
|
if (!(val = b64_read_asn1(bio, it))) {
|
|
ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
|
|
return NULL;
|
|
}
|
|
return val;
|
|
|
|
}
|
|
|
|
/* Copy text from one BIO to another making the output CRLF at EOL */
|
|
int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
|
|
{
|
|
BIO *bf;
|
|
char eol;
|
|
int len;
|
|
char linebuf[MAX_SMLEN];
|
|
/*
|
|
* Buffer output so we don't write one line at a time. This is useful
|
|
* when streaming as we don't end up with one OCTET STRING per line.
|
|
*/
|
|
bf = BIO_new(BIO_f_buffer());
|
|
if (!bf)
|
|
return 0;
|
|
out = BIO_push(bf, out);
|
|
if (flags & SMIME_BINARY) {
|
|
while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
|
|
BIO_write(out, linebuf, len);
|
|
} else {
|
|
if (flags & SMIME_TEXT)
|
|
BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
|
|
while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
|
|
eol = strip_eol(linebuf, &len);
|
|
if (len)
|
|
BIO_write(out, linebuf, len);
|
|
if (eol)
|
|
BIO_write(out, "\r\n", 2);
|
|
}
|
|
}
|
|
(void)BIO_flush(out);
|
|
BIO_pop(out);
|
|
BIO_free(bf);
|
|
return 1;
|
|
}
|
|
|
|
/* Strip off headers if they are text/plain */
|
|
int SMIME_text(BIO *in, BIO *out)
|
|
{
|
|
char iobuf[4096];
|
|
int len;
|
|
STACK_OF(MIME_HEADER) *headers;
|
|
MIME_HEADER *hdr;
|
|
|
|
if (!(headers = mime_parse_hdr(in))) {
|
|
ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
|
|
return 0;
|
|
}
|
|
if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
|
|
ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
|
|
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
|
return 0;
|
|
}
|
|
if (strcmp(hdr->value, "text/plain")) {
|
|
ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
|
|
ERR_add_error_data(2, "type: ", hdr->value);
|
|
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
|
return 0;
|
|
}
|
|
sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
|
|
while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
|
|
BIO_write(out, iobuf, len);
|
|
if (len < 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Split a multipart/XXX message body into component parts: result is
|
|
* canonical parts in a STACK of bios
|
|
*/
|
|
|
|
static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
|
|
{
|
|
char linebuf[MAX_SMLEN];
|
|
int len, blen;
|
|
int eol = 0, next_eol = 0;
|
|
BIO *bpart = NULL;
|
|
STACK_OF(BIO) *parts;
|
|
char state, part, first;
|
|
|
|
blen = strlen(bound);
|
|
part = 0;
|
|
state = 0;
|
|
first = 1;
|
|
parts = sk_BIO_new_null();
|
|
*ret = parts;
|
|
while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
|
|
state = mime_bound_check(linebuf, len, bound, blen);
|
|
if (state == 1) {
|
|
first = 1;
|
|
part++;
|
|
} else if (state == 2) {
|
|
sk_BIO_push(parts, bpart);
|
|
return 1;
|
|
} else if (part) {
|
|
/* Strip CR+LF from linebuf */
|
|
next_eol = strip_eol(linebuf, &len);
|
|
if (first) {
|
|
first = 0;
|
|
if (bpart)
|
|
sk_BIO_push(parts, bpart);
|
|
bpart = BIO_new(BIO_s_mem());
|
|
if (bpart == NULL)
|
|
return 1;
|
|
BIO_set_mem_eof_return(bpart, 0);
|
|
} else if (eol)
|
|
BIO_write(bpart, "\r\n", 2);
|
|
eol = next_eol;
|
|
if (len)
|
|
BIO_write(bpart, linebuf, len);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* This is the big one: parse MIME header lines up to message body */
|
|
|
|
#define MIME_INVALID 0
|
|
#define MIME_START 1
|
|
#define MIME_TYPE 2
|
|
#define MIME_NAME 3
|
|
#define MIME_VALUE 4
|
|
#define MIME_QUOTE 5
|
|
#define MIME_COMMENT 6
|
|
|
|
static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
|
|
{
|
|
char *p, *q, c;
|
|
char *ntmp;
|
|
char linebuf[MAX_SMLEN];
|
|
MIME_HEADER *mhdr = NULL;
|
|
STACK_OF(MIME_HEADER) *headers;
|
|
int len, state, save_state = 0;
|
|
|
|
headers = sk_MIME_HEADER_new(mime_hdr_cmp);
|
|
if (!headers)
|
|
return NULL;
|
|
while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
|
|
/* If whitespace at line start then continuation line */
|
|
if (mhdr && isspace((unsigned char)linebuf[0]))
|
|
state = MIME_NAME;
|
|
else
|
|
state = MIME_START;
|
|
ntmp = NULL;
|
|
/* Go through all characters */
|
|
for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
|
|
p++) {
|
|
|
|
/*
|
|
* State machine to handle MIME headers if this looks horrible
|
|
* that's because it *is*
|
|
*/
|
|
|
|
switch (state) {
|
|
case MIME_START:
|
|
if (c == ':') {
|
|
state = MIME_TYPE;
|
|
*p = 0;
|
|
ntmp = strip_ends(q);
|
|
q = p + 1;
|
|
}
|
|
break;
|
|
|
|
case MIME_TYPE:
|
|
if (c == ';') {
|
|
mime_debug("Found End Value\n");
|
|
*p = 0;
|
|
mhdr = mime_hdr_new(ntmp, strip_ends(q));
|
|
sk_MIME_HEADER_push(headers, mhdr);
|
|
ntmp = NULL;
|
|
q = p + 1;
|
|
state = MIME_NAME;
|
|
} else if (c == '(') {
|
|
save_state = state;
|
|
state = MIME_COMMENT;
|
|
}
|
|
break;
|
|
|
|
case MIME_COMMENT:
|
|
if (c == ')') {
|
|
state = save_state;
|
|
}
|
|
break;
|
|
|
|
case MIME_NAME:
|
|
if (c == '=') {
|
|
state = MIME_VALUE;
|
|
*p = 0;
|
|
ntmp = strip_ends(q);
|
|
q = p + 1;
|
|
}
|
|
break;
|
|
|
|
case MIME_VALUE:
|
|
if (c == ';') {
|
|
state = MIME_NAME;
|
|
*p = 0;
|
|
mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
|
|
ntmp = NULL;
|
|
q = p + 1;
|
|
} else if (c == '"') {
|
|
mime_debug("Found Quote\n");
|
|
state = MIME_QUOTE;
|
|
} else if (c == '(') {
|
|
save_state = state;
|
|
state = MIME_COMMENT;
|
|
}
|
|
break;
|
|
|
|
case MIME_QUOTE:
|
|
if (c == '"') {
|
|
mime_debug("Found Match Quote\n");
|
|
state = MIME_VALUE;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (state == MIME_TYPE) {
|
|
mhdr = mime_hdr_new(ntmp, strip_ends(q));
|
|
sk_MIME_HEADER_push(headers, mhdr);
|
|
} else if (state == MIME_VALUE)
|
|
mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
|
|
if (p == linebuf)
|
|
break; /* Blank line means end of headers */
|
|
}
|
|
|
|
return headers;
|
|
|
|
}
|
|
|
|
static char *strip_ends(char *name)
|
|
{
|
|
return strip_end(strip_start(name));
|
|
}
|
|
|
|
/* Strip a parameter of whitespace from start of param */
|
|
static char *strip_start(char *name)
|
|
{
|
|
char *p, c;
|
|
/* Look for first non white space or quote */
|
|
for (p = name; (c = *p); p++) {
|
|
if (c == '"') {
|
|
/* Next char is start of string if non null */
|
|
if (p[1])
|
|
return p + 1;
|
|
/* Else null string */
|
|
return NULL;
|
|
}
|
|
if (!isspace((unsigned char)c))
|
|
return p;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* As above but strip from end of string : maybe should handle brackets? */
|
|
static char *strip_end(char *name)
|
|
{
|
|
char *p, c;
|
|
if (!name)
|
|
return NULL;
|
|
/* Look for first non white space or quote */
|
|
for (p = name + strlen(name) - 1; p >= name; p--) {
|
|
c = *p;
|
|
if (c == '"') {
|
|
if (p - 1 == name)
|
|
return NULL;
|
|
*p = 0;
|
|
return name;
|
|
}
|
|
if (isspace((unsigned char)c))
|
|
*p = 0;
|
|
else
|
|
return name;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static MIME_HEADER *mime_hdr_new(char *name, char *value)
|
|
{
|
|
MIME_HEADER *mhdr;
|
|
char *tmpname, *tmpval, *p;
|
|
int c;
|
|
if (name) {
|
|
if (!(tmpname = BUF_strdup(name)))
|
|
return NULL;
|
|
for (p = tmpname; *p; p++) {
|
|
c = (unsigned char)*p;
|
|
if (isupper(c)) {
|
|
c = tolower(c);
|
|
*p = c;
|
|
}
|
|
}
|
|
} else
|
|
tmpname = NULL;
|
|
if (value) {
|
|
if (!(tmpval = BUF_strdup(value)))
|
|
return NULL;
|
|
for (p = tmpval; *p; p++) {
|
|
c = (unsigned char)*p;
|
|
if (isupper(c)) {
|
|
c = tolower(c);
|
|
*p = c;
|
|
}
|
|
}
|
|
} else
|
|
tmpval = NULL;
|
|
mhdr = (MIME_HEADER *)OPENSSL_malloc(sizeof(MIME_HEADER));
|
|
if (!mhdr)
|
|
return NULL;
|
|
mhdr->name = tmpname;
|
|
mhdr->value = tmpval;
|
|
if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)))
|
|
return NULL;
|
|
return mhdr;
|
|
}
|
|
|
|
static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
|
|
{
|
|
char *tmpname, *tmpval, *p;
|
|
int c;
|
|
MIME_PARAM *mparam;
|
|
if (name) {
|
|
tmpname = BUF_strdup(name);
|
|
if (!tmpname)
|
|
return 0;
|
|
for (p = tmpname; *p; p++) {
|
|
c = (unsigned char)*p;
|
|
if (isupper(c)) {
|
|
c = tolower(c);
|
|
*p = c;
|
|
}
|
|
}
|
|
} else
|
|
tmpname = NULL;
|
|
if (value) {
|
|
tmpval = BUF_strdup(value);
|
|
if (!tmpval)
|
|
return 0;
|
|
} else
|
|
tmpval = NULL;
|
|
/* Parameter values are case sensitive so leave as is */
|
|
mparam = (MIME_PARAM *)OPENSSL_malloc(sizeof(MIME_PARAM));
|
|
if (!mparam)
|
|
return 0;
|
|
mparam->param_name = tmpname;
|
|
mparam->param_value = tmpval;
|
|
sk_MIME_PARAM_push(mhdr->params, mparam);
|
|
return 1;
|
|
}
|
|
|
|
static int mime_hdr_cmp(const MIME_HEADER *const *a,
|
|
const MIME_HEADER *const *b)
|
|
{
|
|
if (!(*a)->name || !(*b)->name)
|
|
return ! !(*a)->name - ! !(*b)->name;
|
|
|
|
return (strcmp((*a)->name, (*b)->name));
|
|
}
|
|
|
|
static int mime_param_cmp(const MIME_PARAM *const *a,
|
|
const MIME_PARAM *const *b)
|
|
{
|
|
if (!(*a)->param_name || !(*b)->param_name)
|
|
return ! !(*a)->param_name - ! !(*b)->param_name;
|
|
return (strcmp((*a)->param_name, (*b)->param_name));
|
|
}
|
|
|
|
/* Find a header with a given name (if possible) */
|
|
|
|
static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
|
|
{
|
|
MIME_HEADER htmp;
|
|
int idx;
|
|
htmp.name = name;
|
|
idx = sk_MIME_HEADER_find(hdrs, &htmp);
|
|
if (idx < 0)
|
|
return NULL;
|
|
return sk_MIME_HEADER_value(hdrs, idx);
|
|
}
|
|
|
|
static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
|
|
{
|
|
MIME_PARAM param;
|
|
int idx;
|
|
param.param_name = name;
|
|
idx = sk_MIME_PARAM_find(hdr->params, ¶m);
|
|
if (idx < 0)
|
|
return NULL;
|
|
return sk_MIME_PARAM_value(hdr->params, idx);
|
|
}
|
|
|
|
static void mime_hdr_free(MIME_HEADER *hdr)
|
|
{
|
|
if (hdr->name)
|
|
OPENSSL_free(hdr->name);
|
|
if (hdr->value)
|
|
OPENSSL_free(hdr->value);
|
|
if (hdr->params)
|
|
sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
|
|
OPENSSL_free(hdr);
|
|
}
|
|
|
|
static void mime_param_free(MIME_PARAM *param)
|
|
{
|
|
if (param->param_name)
|
|
OPENSSL_free(param->param_name);
|
|
if (param->param_value)
|
|
OPENSSL_free(param->param_value);
|
|
OPENSSL_free(param);
|
|
}
|
|
|
|
/*-
|
|
* Check for a multipart boundary. Returns:
|
|
* 0 : no boundary
|
|
* 1 : part boundary
|
|
* 2 : final boundary
|
|
*/
|
|
static int mime_bound_check(char *line, int linelen, char *bound, int blen)
|
|
{
|
|
if (linelen == -1)
|
|
linelen = strlen(line);
|
|
if (blen == -1)
|
|
blen = strlen(bound);
|
|
/* Quickly eliminate if line length too short */
|
|
if (blen + 2 > linelen)
|
|
return 0;
|
|
/* Check for part boundary */
|
|
if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
|
|
if (!strncmp(line + blen + 2, "--", 2))
|
|
return 2;
|
|
else
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int strip_eol(char *linebuf, int *plen)
|
|
{
|
|
int len = *plen;
|
|
char *p, c;
|
|
int is_eol = 0;
|
|
p = linebuf + len - 1;
|
|
for (p = linebuf + len - 1; len > 0; len--, p--) {
|
|
c = *p;
|
|
if (c == '\n')
|
|
is_eol = 1;
|
|
else if (c != '\r')
|
|
break;
|
|
}
|
|
*plen = len;
|
|
return is_eol;
|
|
}
|