mirror of
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569 lines
14 KiB
C
569 lines
14 KiB
C
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/* $OpenBSD: bio_b64.c,v 1.22 2018/08/24 19:47:25 tb Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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static int b64_write(BIO *h, const char *buf, int num);
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static int b64_read(BIO *h, char *buf, int size);
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static int b64_puts(BIO *h, const char *str);
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/*static int b64_gets(BIO *h, char *str, int size); */
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static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int b64_new(BIO *h);
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static int b64_free(BIO *data);
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static long b64_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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#define B64_BLOCK_SIZE 1024
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#define B64_BLOCK_SIZE2 768
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#define B64_NONE 0
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#define B64_ENCODE 1
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#define B64_DECODE 2
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typedef struct b64_struct {
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/*BIO *bio; moved to the BIO structure */
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int buf_len;
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int buf_off;
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int tmp_len; /* used to find the start when decoding */
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int tmp_nl; /* If true, scan until '\n' */
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int encode;
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int start; /* have we started decoding yet? */
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int cont; /* <= 0 when finished */
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EVP_ENCODE_CTX base64;
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char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
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char tmp[B64_BLOCK_SIZE];
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} BIO_B64_CTX;
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static const BIO_METHOD methods_b64 = {
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.type = BIO_TYPE_BASE64,
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.name = "base64 encoding",
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.bwrite = b64_write,
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.bread = b64_read,
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.bputs = b64_puts,
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.ctrl = b64_ctrl,
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.create = b64_new,
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.destroy = b64_free,
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.callback_ctrl = b64_callback_ctrl
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};
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const BIO_METHOD *
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BIO_f_base64(void)
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{
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return (&methods_b64);
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}
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static int
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b64_new(BIO *bi)
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{
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BIO_B64_CTX *ctx;
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ctx = malloc(sizeof(BIO_B64_CTX));
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if (ctx == NULL)
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return (0);
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ctx->buf_len = 0;
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ctx->tmp_len = 0;
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ctx->tmp_nl = 0;
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ctx->buf_off = 0;
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ctx->cont = 1;
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ctx->start = 1;
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ctx->encode = 0;
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bi->init = 1;
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bi->ptr = (char *)ctx;
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bi->flags = 0;
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bi->num = 0;
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return (1);
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}
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static int
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b64_free(BIO *a)
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{
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if (a == NULL)
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return (0);
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free(a->ptr);
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a->ptr = NULL;
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a->init = 0;
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a->flags = 0;
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return (1);
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}
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static int
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b64_read(BIO *b, char *out, int outl)
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{
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int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
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BIO_B64_CTX *ctx;
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unsigned char *p, *q;
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if (out == NULL)
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return (0);
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ctx = (BIO_B64_CTX *)b->ptr;
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if ((ctx == NULL) || (b->next_bio == NULL))
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return (0);
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BIO_clear_retry_flags(b);
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if (ctx->encode != B64_DECODE) {
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ctx->encode = B64_DECODE;
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ctx->buf_len = 0;
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ctx->buf_off = 0;
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ctx->tmp_len = 0;
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EVP_DecodeInit(&(ctx->base64));
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}
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/* First check if there are bytes decoded/encoded */
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if (ctx->buf_len > 0) {
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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i = ctx->buf_len - ctx->buf_off;
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if (i > outl)
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i = outl;
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OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
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memcpy(out, &(ctx->buf[ctx->buf_off]), i);
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ret = i;
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out += i;
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outl -= i;
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ctx->buf_off += i;
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if (ctx->buf_len == ctx->buf_off) {
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ctx->buf_len = 0;
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ctx->buf_off = 0;
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}
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}
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/* At this point, we have room of outl bytes and an empty
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* buffer, so we should read in some more. */
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ret_code = 0;
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while (outl > 0) {
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if (ctx->cont <= 0)
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break;
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i = BIO_read(b->next_bio, &(ctx->tmp[ctx->tmp_len]),
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B64_BLOCK_SIZE - ctx->tmp_len);
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if (i <= 0) {
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ret_code = i;
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/* Should we continue next time we are called? */
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if (!BIO_should_retry(b->next_bio)) {
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ctx->cont = i;
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/* If buffer empty break */
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if (ctx->tmp_len == 0)
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break;
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/* Fall through and process what we have */
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else
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i = 0;
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}
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/* else we retry and add more data to buffer */
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else
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break;
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}
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i += ctx->tmp_len;
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ctx->tmp_len = i;
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/* We need to scan, a line at a time until we
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* have a valid line if we are starting. */
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if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
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/* ctx->start=1; */
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ctx->tmp_len = 0;
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} else if (ctx->start) {
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q = p =(unsigned char *)ctx->tmp;
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num = 0;
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for (j = 0; j < i; j++) {
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if (*(q++) != '\n')
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continue;
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/* due to a previous very long line,
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* we need to keep on scanning for a '\n'
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* before we even start looking for
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* base64 encoded stuff. */
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if (ctx->tmp_nl) {
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p = q;
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ctx->tmp_nl = 0;
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continue;
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}
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k = EVP_DecodeUpdate(&(ctx->base64),
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(unsigned char *)ctx->buf,
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&num, p, q - p);
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if ((k <= 0) && (num == 0) && (ctx->start))
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EVP_DecodeInit(&ctx->base64);
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else {
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if (p != (unsigned char *)
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&(ctx->tmp[0])) {
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i -= (p - (unsigned char *)
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&(ctx->tmp[0]));
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for (x = 0; x < i; x++)
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ctx->tmp[x] = p[x];
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}
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EVP_DecodeInit(&ctx->base64);
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ctx->start = 0;
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break;
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}
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p = q;
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}
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/* we fell off the end without starting */
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if ((j == i) && (num == 0)) {
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/* Is this is one long chunk?, if so, keep on
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* reading until a new line. */
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if (p == (unsigned char *)&(ctx->tmp[0])) {
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/* Check buffer full */
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if (i == B64_BLOCK_SIZE) {
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ctx->tmp_nl = 1;
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ctx->tmp_len = 0;
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}
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}
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else if (p != q) /* finished on a '\n' */
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{
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n = q - p;
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for (ii = 0; ii < n; ii++)
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ctx->tmp[ii] = p[ii];
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ctx->tmp_len = n;
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}
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/* else finished on a '\n' */
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continue;
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} else {
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ctx->tmp_len = 0;
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}
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} else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
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/* If buffer isn't full and we can retry then
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* restart to read in more data.
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*/
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continue;
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}
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if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
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int z, jj;
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jj = i & ~3; /* process per 4 */
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z = EVP_DecodeBlock((unsigned char *)ctx->buf,
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(unsigned char *)ctx->tmp, jj);
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if (jj > 2) {
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if (ctx->tmp[jj-1] == '=') {
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z--;
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if (ctx->tmp[jj-2] == '=')
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z--;
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}
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}
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/* z is now number of output bytes and jj is the
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* number consumed */
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if (jj != i) {
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memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
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ctx->tmp_len = i - jj;
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}
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ctx->buf_len = 0;
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if (z > 0) {
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ctx->buf_len = z;
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}
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i = z;
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} else {
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i = EVP_DecodeUpdate(&(ctx->base64),
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(unsigned char *)ctx->buf, &ctx->buf_len,
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(unsigned char *)ctx->tmp, i);
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ctx->tmp_len = 0;
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}
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ctx->buf_off = 0;
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if (i < 0) {
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ret_code = 0;
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ctx->buf_len = 0;
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break;
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}
|
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if (ctx->buf_len <= outl)
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i = ctx->buf_len;
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else
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i = outl;
|
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memcpy(out, ctx->buf, i);
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ret += i;
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ctx->buf_off = i;
|
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if (ctx->buf_off == ctx->buf_len) {
|
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ctx->buf_len = 0;
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ctx->buf_off = 0;
|
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}
|
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outl -= i;
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out += i;
|
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}
|
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/* BIO_clear_retry_flags(b); */
|
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BIO_copy_next_retry(b);
|
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return ((ret == 0) ? ret_code : ret);
|
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|
}
|
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|
|
||
|
static int
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b64_write(BIO *b, const char *in, int inl)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
int n;
|
||
|
int i;
|
||
|
BIO_B64_CTX *ctx;
|
||
|
|
||
|
ctx = (BIO_B64_CTX *)b->ptr;
|
||
|
BIO_clear_retry_flags(b);
|
||
|
|
||
|
if (ctx->encode != B64_ENCODE) {
|
||
|
ctx->encode = B64_ENCODE;
|
||
|
ctx->buf_len = 0;
|
||
|
ctx->buf_off = 0;
|
||
|
ctx->tmp_len = 0;
|
||
|
EVP_EncodeInit(&(ctx->base64));
|
||
|
}
|
||
|
|
||
|
OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
|
||
|
OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
|
||
|
OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
||
|
n = ctx->buf_len - ctx->buf_off;
|
||
|
while (n > 0) {
|
||
|
i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
|
||
|
if (i <= 0) {
|
||
|
BIO_copy_next_retry(b);
|
||
|
return (i);
|
||
|
}
|
||
|
OPENSSL_assert(i <= n);
|
||
|
ctx->buf_off += i;
|
||
|
OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
|
||
|
OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
||
|
n -= i;
|
||
|
}
|
||
|
/* at this point all pending data has been written */
|
||
|
ctx->buf_off = 0;
|
||
|
ctx->buf_len = 0;
|
||
|
|
||
|
if ((in == NULL) || (inl <= 0))
|
||
|
return (0);
|
||
|
|
||
|
while (inl > 0) {
|
||
|
n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
|
||
|
|
||
|
if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
|
||
|
if (ctx->tmp_len > 0) {
|
||
|
OPENSSL_assert(ctx->tmp_len <= 3);
|
||
|
n = 3 - ctx->tmp_len;
|
||
|
/* There's a theoretical possibility for this */
|
||
|
if (n > inl)
|
||
|
n = inl;
|
||
|
memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
|
||
|
ctx->tmp_len += n;
|
||
|
ret += n;
|
||
|
if (ctx->tmp_len < 3)
|
||
|
break;
|
||
|
ctx->buf_len = EVP_EncodeBlock(
|
||
|
(unsigned char *)ctx->buf,
|
||
|
(unsigned char *)ctx->tmp, ctx->tmp_len);
|
||
|
OPENSSL_assert(ctx->buf_len <=
|
||
|
(int)sizeof(ctx->buf));
|
||
|
OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
||
|
/* Since we're now done using the temporary
|
||
|
buffer, the length should be 0'd */
|
||
|
ctx->tmp_len = 0;
|
||
|
} else {
|
||
|
if (n < 3) {
|
||
|
memcpy(ctx->tmp, in, n);
|
||
|
ctx->tmp_len = n;
|
||
|
ret += n;
|
||
|
break;
|
||
|
}
|
||
|
n -= n % 3;
|
||
|
ctx->buf_len = EVP_EncodeBlock(
|
||
|
(unsigned char *)ctx->buf,
|
||
|
(const unsigned char *)in, n);
|
||
|
OPENSSL_assert(ctx->buf_len <=
|
||
|
(int)sizeof(ctx->buf));
|
||
|
OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
||
|
ret += n;
|
||
|
}
|
||
|
} else {
|
||
|
if (!EVP_EncodeUpdate(&(ctx->base64),
|
||
|
(unsigned char *)ctx->buf, &ctx->buf_len,
|
||
|
(unsigned char *)in, n))
|
||
|
return ((ret == 0) ? -1 : ret);
|
||
|
OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
|
||
|
OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
||
|
ret += n;
|
||
|
}
|
||
|
inl -= n;
|
||
|
in += n;
|
||
|
|
||
|
ctx->buf_off = 0;
|
||
|
n = ctx->buf_len;
|
||
|
while (n > 0) {
|
||
|
i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
|
||
|
if (i <= 0) {
|
||
|
BIO_copy_next_retry(b);
|
||
|
return ((ret == 0) ? i : ret);
|
||
|
}
|
||
|
OPENSSL_assert(i <= n);
|
||
|
n -= i;
|
||
|
ctx->buf_off += i;
|
||
|
OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
|
||
|
OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
||
|
}
|
||
|
ctx->buf_len = 0;
|
||
|
ctx->buf_off = 0;
|
||
|
}
|
||
|
return (ret);
|
||
|
}
|
||
|
|
||
|
static long
|
||
|
b64_ctrl(BIO *b, int cmd, long num, void *ptr)
|
||
|
{
|
||
|
BIO_B64_CTX *ctx;
|
||
|
long ret = 1;
|
||
|
int i;
|
||
|
|
||
|
ctx = (BIO_B64_CTX *)b->ptr;
|
||
|
|
||
|
switch (cmd) {
|
||
|
case BIO_CTRL_RESET:
|
||
|
ctx->cont = 1;
|
||
|
ctx->start = 1;
|
||
|
ctx->encode = B64_NONE;
|
||
|
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
|
||
|
break;
|
||
|
case BIO_CTRL_EOF: /* More to read */
|
||
|
if (ctx->cont <= 0)
|
||
|
ret = 1;
|
||
|
else
|
||
|
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
|
||
|
break;
|
||
|
case BIO_CTRL_WPENDING: /* More to write in buffer */
|
||
|
OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
||
|
ret = ctx->buf_len - ctx->buf_off;
|
||
|
if ((ret == 0) && (ctx->encode != B64_NONE) &&
|
||
|
(ctx->base64.num != 0))
|
||
|
ret = 1;
|
||
|
else if (ret <= 0)
|
||
|
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
|
||
|
break;
|
||
|
case BIO_CTRL_PENDING: /* More to read in buffer */
|
||
|
OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
|
||
|
ret = ctx->buf_len - ctx->buf_off;
|
||
|
if (ret <= 0)
|
||
|
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
|
||
|
break;
|
||
|
case BIO_CTRL_FLUSH:
|
||
|
/* do a final write */
|
||
|
again:
|
||
|
while (ctx->buf_len != ctx->buf_off) {
|
||
|
i = b64_write(b, NULL, 0);
|
||
|
if (i < 0)
|
||
|
return i;
|
||
|
}
|
||
|
if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
|
||
|
if (ctx->tmp_len != 0) {
|
||
|
ctx->buf_len = EVP_EncodeBlock(
|
||
|
(unsigned char *)ctx->buf,
|
||
|
(unsigned char *)ctx->tmp,
|
||
|
ctx->tmp_len);
|
||
|
ctx->buf_off = 0;
|
||
|
ctx->tmp_len = 0;
|
||
|
goto again;
|
||
|
}
|
||
|
} else if (ctx->encode != B64_NONE && ctx->base64.num != 0) {
|
||
|
ctx->buf_off = 0;
|
||
|
EVP_EncodeFinal(&(ctx->base64),
|
||
|
(unsigned char *)ctx->buf,
|
||
|
&(ctx->buf_len));
|
||
|
/* push out the bytes */
|
||
|
goto again;
|
||
|
}
|
||
|
/* Finally flush the underlying BIO */
|
||
|
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
|
||
|
break;
|
||
|
|
||
|
case BIO_C_DO_STATE_MACHINE:
|
||
|
BIO_clear_retry_flags(b);
|
||
|
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
|
||
|
BIO_copy_next_retry(b);
|
||
|
break;
|
||
|
|
||
|
case BIO_CTRL_DUP:
|
||
|
break;
|
||
|
case BIO_CTRL_INFO:
|
||
|
case BIO_CTRL_GET:
|
||
|
case BIO_CTRL_SET:
|
||
|
default:
|
||
|
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
|
||
|
break;
|
||
|
}
|
||
|
return (ret);
|
||
|
}
|
||
|
|
||
|
static long
|
||
|
b64_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
|
||
|
{
|
||
|
long ret = 1;
|
||
|
|
||
|
if (b->next_bio == NULL)
|
||
|
return (0);
|
||
|
switch (cmd) {
|
||
|
default:
|
||
|
ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
|
||
|
break;
|
||
|
}
|
||
|
return (ret);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
b64_puts(BIO *b, const char *str)
|
||
|
{
|
||
|
return b64_write(b, str, strlen(str));
|
||
|
}
|