497 lines
12 KiB
C
497 lines
12 KiB
C
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/* $OpenBSD: bio_asn1.c,v 1.13 2018/05/01 13:29:09 tb Exp $ */
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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) 2006 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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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* Experimental ASN1 BIO. When written through the data is converted
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* to an ASN1 string type: default is OCTET STRING. Additional functions
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* can be provided to add prefix and suffix data.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/bio.h>
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#include <openssl/asn1.h>
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/* Must be large enough for biggest tag+length */
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#define DEFAULT_ASN1_BUF_SIZE 20
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typedef enum {
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ASN1_STATE_START,
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ASN1_STATE_PRE_COPY,
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ASN1_STATE_HEADER,
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ASN1_STATE_HEADER_COPY,
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ASN1_STATE_DATA_COPY,
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ASN1_STATE_POST_COPY,
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ASN1_STATE_DONE
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} asn1_bio_state_t;
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typedef struct BIO_ASN1_EX_FUNCS_st {
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asn1_ps_func *ex_func;
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asn1_ps_func *ex_free_func;
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} BIO_ASN1_EX_FUNCS;
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typedef struct BIO_ASN1_BUF_CTX_t {
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/* Internal state */
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asn1_bio_state_t state;
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/* Internal buffer */
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unsigned char *buf;
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/* Size of buffer */
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int bufsize;
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/* Current position in buffer */
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int bufpos;
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/* Current buffer length */
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int buflen;
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/* Amount of data to copy */
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int copylen;
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/* Class and tag to use */
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int asn1_class, asn1_tag;
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asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free;
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/* Extra buffer for prefix and suffix data */
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unsigned char *ex_buf;
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int ex_len;
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int ex_pos;
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void *ex_arg;
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} BIO_ASN1_BUF_CTX;
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static int asn1_bio_write(BIO *h, const char *buf, int num);
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static int asn1_bio_read(BIO *h, char *buf, int size);
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static int asn1_bio_puts(BIO *h, const char *str);
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static int asn1_bio_gets(BIO *h, char *str, int size);
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static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int asn1_bio_new(BIO *h);
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static int asn1_bio_free(BIO *data);
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static long asn1_bio_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
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static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
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asn1_ps_func *cleanup, asn1_bio_state_t next);
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static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
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asn1_ps_func *setup, asn1_bio_state_t ex_state,
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asn1_bio_state_t other_state);
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static const BIO_METHOD methods_asn1 = {
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.type = BIO_TYPE_ASN1,
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.name = "asn1",
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.bwrite = asn1_bio_write,
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.bread = asn1_bio_read,
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.bputs = asn1_bio_puts,
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.bgets = asn1_bio_gets,
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.ctrl = asn1_bio_ctrl,
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.create = asn1_bio_new,
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.destroy = asn1_bio_free,
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.callback_ctrl = asn1_bio_callback_ctrl
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};
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const BIO_METHOD *
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BIO_f_asn1(void)
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{
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return (&methods_asn1);
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}
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static int
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asn1_bio_new(BIO *b)
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{
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BIO_ASN1_BUF_CTX *ctx;
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ctx = malloc(sizeof(BIO_ASN1_BUF_CTX));
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if (!ctx)
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return 0;
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if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE)) {
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free(ctx);
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return 0;
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}
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b->init = 1;
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b->ptr = (char *)ctx;
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b->flags = 0;
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return 1;
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}
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static int
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asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
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{
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ctx->buf = malloc(size);
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if (!ctx->buf)
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return 0;
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ctx->bufsize = size;
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ctx->bufpos = 0;
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ctx->buflen = 0;
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ctx->copylen = 0;
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ctx->asn1_class = V_ASN1_UNIVERSAL;
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ctx->asn1_tag = V_ASN1_OCTET_STRING;
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ctx->ex_buf = NULL;
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ctx->ex_pos = 0;
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ctx->ex_len = 0;
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ctx->state = ASN1_STATE_START;
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return 1;
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}
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static int
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asn1_bio_free(BIO *b)
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{
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BIO_ASN1_BUF_CTX *ctx;
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ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
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if (ctx == NULL)
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return 0;
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free(ctx->buf);
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free(ctx);
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b->init = 0;
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b->ptr = NULL;
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b->flags = 0;
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return 1;
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}
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static int
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asn1_bio_write(BIO *b, const char *in , int inl)
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{
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BIO_ASN1_BUF_CTX *ctx;
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int wrmax, wrlen, ret, buflen;
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unsigned char *p;
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if (!in || (inl < 0) || (b->next_bio == NULL))
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return 0;
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ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
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if (ctx == NULL)
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return 0;
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wrlen = 0;
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ret = -1;
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for (;;) {
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switch (ctx->state) {
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/* Setup prefix data, call it */
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case ASN1_STATE_START:
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if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
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ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
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return 0;
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break;
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/* Copy any pre data first */
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case ASN1_STATE_PRE_COPY:
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ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
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ASN1_STATE_HEADER);
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if (ret <= 0)
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goto done;
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break;
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case ASN1_STATE_HEADER:
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buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
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if (buflen <= 0 || buflen > ctx->bufsize)
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return -1;
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ctx->buflen = buflen;
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p = ctx->buf;
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ASN1_put_object(&p, 0, inl,
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ctx->asn1_tag, ctx->asn1_class);
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ctx->copylen = inl;
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ctx->state = ASN1_STATE_HEADER_COPY;
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break;
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case ASN1_STATE_HEADER_COPY:
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ret = BIO_write(b->next_bio,
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ctx->buf + ctx->bufpos, ctx->buflen);
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if (ret <= 0)
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goto done;
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ctx->buflen -= ret;
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if (ctx->buflen)
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ctx->bufpos += ret;
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else {
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ctx->bufpos = 0;
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ctx->state = ASN1_STATE_DATA_COPY;
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}
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break;
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case ASN1_STATE_DATA_COPY:
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if (inl > ctx->copylen)
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wrmax = ctx->copylen;
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else
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wrmax = inl;
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ret = BIO_write(b->next_bio, in, wrmax);
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if (ret <= 0)
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break;
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wrlen += ret;
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ctx->copylen -= ret;
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in += ret;
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inl -= ret;
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if (ctx->copylen == 0)
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ctx->state = ASN1_STATE_HEADER;
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if (inl == 0)
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goto done;
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break;
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default:
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BIO_clear_retry_flags(b);
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return 0;
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}
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}
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done:
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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return (wrlen > 0) ? wrlen : ret;
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}
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static int
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asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, asn1_ps_func *cleanup,
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asn1_bio_state_t next)
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{
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int ret;
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if (ctx->ex_len <= 0)
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return 1;
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for (;;) {
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ret = BIO_write(b->next_bio, ctx->ex_buf + ctx->ex_pos,
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ctx->ex_len);
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if (ret <= 0)
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break;
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ctx->ex_len -= ret;
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if (ctx->ex_len > 0)
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ctx->ex_pos += ret;
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else {
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if (cleanup)
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cleanup(b, &ctx->ex_buf, &ctx->ex_len,
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&ctx->ex_arg);
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ctx->state = next;
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ctx->ex_pos = 0;
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break;
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}
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}
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return ret;
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}
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static int
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asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, asn1_ps_func *setup,
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asn1_bio_state_t ex_state, asn1_bio_state_t other_state)
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{
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if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg)) {
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BIO_clear_retry_flags(b);
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return 0;
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}
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if (ctx->ex_len > 0)
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ctx->state = ex_state;
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else
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ctx->state = other_state;
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return 1;
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}
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static int
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asn1_bio_read(BIO *b, char *in , int inl)
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{
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if (!b->next_bio)
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return 0;
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return BIO_read(b->next_bio, in , inl);
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}
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static int
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asn1_bio_puts(BIO *b, const char *str)
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{
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return asn1_bio_write(b, str, strlen(str));
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}
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static int
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asn1_bio_gets(BIO *b, char *str, int size)
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{
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if (!b->next_bio)
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return 0;
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return BIO_gets(b->next_bio, str , size);
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}
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static long
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asn1_bio_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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{
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if (b->next_bio == NULL)
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return (0);
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return BIO_callback_ctrl(b->next_bio, cmd, fp);
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}
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static long
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asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2)
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{
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BIO_ASN1_BUF_CTX *ctx;
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BIO_ASN1_EX_FUNCS *ex_func;
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long ret = 1;
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|
|
ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
|
||
|
|
if (ctx == NULL)
|
||
|
|
return 0;
|
||
|
|
switch (cmd) {
|
||
|
|
|
||
|
|
case BIO_C_SET_PREFIX:
|
||
|
|
ex_func = arg2;
|
||
|
|
ctx->prefix = ex_func->ex_func;
|
||
|
|
ctx->prefix_free = ex_func->ex_free_func;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BIO_C_GET_PREFIX:
|
||
|
|
ex_func = arg2;
|
||
|
|
ex_func->ex_func = ctx->prefix;
|
||
|
|
ex_func->ex_free_func = ctx->prefix_free;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BIO_C_SET_SUFFIX:
|
||
|
|
ex_func = arg2;
|
||
|
|
ctx->suffix = ex_func->ex_func;
|
||
|
|
ctx->suffix_free = ex_func->ex_free_func;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BIO_C_GET_SUFFIX:
|
||
|
|
ex_func = arg2;
|
||
|
|
ex_func->ex_func = ctx->suffix;
|
||
|
|
ex_func->ex_free_func = ctx->suffix_free;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BIO_C_SET_EX_ARG:
|
||
|
|
ctx->ex_arg = arg2;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BIO_C_GET_EX_ARG:
|
||
|
|
*(void **)arg2 = ctx->ex_arg;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BIO_CTRL_FLUSH:
|
||
|
|
if (!b->next_bio)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* Call post function if possible */
|
||
|
|
if (ctx->state == ASN1_STATE_HEADER) {
|
||
|
|
if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
|
||
|
|
ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ctx->state == ASN1_STATE_POST_COPY) {
|
||
|
|
ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
|
||
|
|
ASN1_STATE_DONE);
|
||
|
|
if (ret <= 0)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ctx->state == ASN1_STATE_DONE)
|
||
|
|
return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
|
||
|
|
else {
|
||
|
|
BIO_clear_retry_flags(b);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
|
||
|
|
default:
|
||
|
|
if (!b->next_bio)
|
||
|
|
return 0;
|
||
|
|
return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
asn1_bio_set_ex(BIO *b, int cmd, asn1_ps_func *ex_func, asn1_ps_func
|
||
|
|
*ex_free_func)
|
||
|
|
{
|
||
|
|
BIO_ASN1_EX_FUNCS extmp;
|
||
|
|
|
||
|
|
extmp.ex_func = ex_func;
|
||
|
|
extmp.ex_free_func = ex_free_func;
|
||
|
|
return BIO_ctrl(b, cmd, 0, &extmp);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
asn1_bio_get_ex(BIO *b, int cmd, asn1_ps_func **ex_func,
|
||
|
|
asn1_ps_func **ex_free_func)
|
||
|
|
{
|
||
|
|
BIO_ASN1_EX_FUNCS extmp;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = BIO_ctrl(b, cmd, 0, &extmp);
|
||
|
|
if (ret > 0) {
|
||
|
|
*ex_func = extmp.ex_func;
|
||
|
|
*ex_free_func = extmp.ex_free_func;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix, asn1_ps_func *prefix_free)
|
||
|
|
{
|
||
|
|
return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix, asn1_ps_func **pprefix_free)
|
||
|
|
{
|
||
|
|
return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix, asn1_ps_func *suffix_free)
|
||
|
|
{
|
||
|
|
return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix, asn1_ps_func **psuffix_free)
|
||
|
|
{
|
||
|
|
return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);
|
||
|
|
}
|