/*
* Copyright 2008-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "crypto/ctype.h"
#include "internal/cryptlib.h"
#include <openssl/rand.h>
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/cms.h>
#include "crypto/evp.h"
#include "internal/bio.h"
#include "asn1_local.h"
/*
* Generalised MIME like utilities for streaming ASN1. Although many have a
* PKCS7/CMS like flavour others are more general purpose.
*/
/*
* MIME format structures Note that all are translated to lower case apart
* from parameter values. Quotes are stripped off
*/
struct mime_param_st {
char *param_name; /* Param name e.g. "micalg" */
char *param_value; /* Param value e.g. "sha1" */
};
struct mime_header_st {
char *name; /* Name of line e.g. "content-type" */
char *value; /* Value of line e.g. "text/plain" */
STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
};
static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
const ASN1_ITEM *it);
static char *strip_ends(char *name);
static char *strip_start(char *name);
static char *strip_end(char *name);
static MIME_HEADER *mime_hdr_new(const char *name, const char *value);
static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value);
static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
static int mime_hdr_cmp(const MIME_HEADER *const *a,
const MIME_HEADER *const *b);
static int mime_param_cmp(const MIME_PARAM *const *a,
const MIME_PARAM *const *b);
static void mime_param_free(MIME_PARAM *param);
static int mime_bound_check(char *line, int linelen, const char *bound, int blen);
static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret);
static int strip_eol(char *linebuf, int *plen, int flags);
static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name);
static void mime_hdr_free(MIME_HEADER *hdr);
#define MAX_SMLEN 1024
#define mime_debug(x) /* x */
/* Output an ASN1 structure in BER format streaming if necessary */
/* unfortunately cannot constify this due to CMS_stream() and PKCS7_stream() */
int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
const ASN1_ITEM *it)
{
/* If streaming create stream BIO and copy all content through it */
if (flags & SMIME_STREAM) {
BIO *bio, *tbio;
bio = BIO_new_NDEF(out, val, it);
if (!bio) {
ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
return 0;
}
SMIME_crlf_copy(in, bio, flags);
(void)BIO_flush(bio);
/* Free up successive BIOs until we hit the old output BIO */
do {
tbio = BIO_pop(bio);
BIO_free(bio);
bio = tbio;
} while (bio != out);
}
/*
* else just write out ASN1 structure which will have all content stored
* internally
*/
else
ASN1_item_i2d_bio(it, out, val);
return 1;
}
/* Base 64 read and write of ASN1 structure */
static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
const ASN1_ITEM *it)
{
BIO *b64;
int r;
b64 = BIO_new(BIO_f_base64());
if (b64 == NULL) {
ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
return 0;
}
/*
* prepend the b64 BIO so all data is base64 encoded.
*/
out = BIO_push(b64, out);
r = i2d_ASN1_bio_stream(out, val, in, flags, it);
(void)BIO_flush(out);
BIO_pop(out);
<