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553 lines
16 KiB
C
553 lines
16 KiB
C
/*
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* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "internal/cryptlib.h"
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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#include "internal/bio.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 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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/*
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* BIO *bio; moved to the BIO structure
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*/
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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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BIO_TYPE_BASE64,
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"base64 encoding",
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/* TODO: Convert to new style write function */
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bwrite_conv,
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b64_write,
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/* TODO: Convert to new style read function */
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bread_conv,
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b64_read,
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b64_puts,
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NULL, /* b64_gets, */
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b64_ctrl,
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b64_new,
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b64_free,
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b64_callback_ctrl,
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};
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const BIO_METHOD *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 b64_new(BIO *bi)
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{
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BIO_B64_CTX *ctx;
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if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
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EVPerr(EVP_F_B64_NEW, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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ctx->cont = 1;
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ctx->start = 1;
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ctx->base64 = EVP_ENCODE_CTX_new();
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if (ctx->base64 == NULL) {
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OPENSSL_free(ctx);
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return 0;
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}
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BIO_set_data(bi, ctx);
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BIO_set_init(bi, 1);
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return 1;
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}
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static int b64_free(BIO *a)
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{
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BIO_B64_CTX *ctx;
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if (a == NULL)
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return 0;
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ctx = BIO_get_data(a);
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if (ctx == NULL)
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return 0;
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EVP_ENCODE_CTX_free(ctx->base64);
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OPENSSL_free(ctx);
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BIO_set_data(a, NULL);
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BIO_set_init(a, 0);
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return 1;
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}
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static int 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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BIO *next;
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if (out == NULL)
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return 0;
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ctx = (BIO_B64_CTX *)BIO_get_data(b);
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next = BIO_next(b);
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if ((ctx == NULL) || (next == 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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/*
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* At this point, we have room of outl bytes and an empty buffer, so we
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* should read in some more.
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*/
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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(next, &(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(next)) {
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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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/*
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* We need to scan, a line at a time until we have a valid line if we
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* are starting.
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*/
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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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/*
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* due to a previous very long line, we need to keep on
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* scanning for a '\n' before we even start looking for
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* base64 encoded stuff.
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*/
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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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/*
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* Is this is one long chunk?, if so, keep on reading until a
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* new line.
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*/
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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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} else if (p != q) { /* finished on a '\n' */
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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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/*
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* If buffer isn't full and we can retry then restart to read in
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* 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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/*
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* z is now number of output bytes and jj is the number consumed
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*/
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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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/*
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* If eof or an error was signalled, then the condition
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* 'ctx->cont <= 0' will prevent b64_read() from reading
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* more data on subsequent calls. This assignment was
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* deleted accidentally in commit 5562cfaca4f3.
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*/
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ctx->cont = i;
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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 b64_write(BIO *b, const char *in, int inl)
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{
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int ret = 0;
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int n;
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int i;
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BIO_B64_CTX *ctx;
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BIO *next;
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ctx = (BIO_B64_CTX *)BIO_get_data(b);
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next = BIO_next(b);
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if ((ctx == NULL) || (next == NULL))
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return 0;
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BIO_clear_retry_flags(b);
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if (ctx->encode != B64_ENCODE) {
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ctx->encode = B64_ENCODE;
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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_EncodeInit(ctx->base64);
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}
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OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
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OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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n = ctx->buf_len - ctx->buf_off;
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while (n > 0) {
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i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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return i;
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}
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OPENSSL_assert(i <= n);
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ctx->buf_off += i;
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OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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n -= i;
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}
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/* at this point all pending data has been written */
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ctx->buf_off = 0;
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ctx->buf_len = 0;
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if ((in == NULL) || (inl <= 0))
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return 0;
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while (inl > 0) {
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n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
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if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
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if (ctx->tmp_len > 0) {
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OPENSSL_assert(ctx->tmp_len <= 3);
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n = 3 - ctx->tmp_len;
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/*
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* There's a theoretical possibility for this
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*/
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if (n > inl)
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n = inl;
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memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
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ctx->tmp_len += n;
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ret += n;
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if (ctx->tmp_len < 3)
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break;
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ctx->buf_len =
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EVP_EncodeBlock((unsigned char *)ctx->buf,
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(unsigned char *)ctx->tmp, ctx->tmp_len);
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OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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/*
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* Since we're now done using the temporary buffer, the
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* length should be 0'd
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*/
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ctx->tmp_len = 0;
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} else {
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if (n < 3) {
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memcpy(ctx->tmp, in, n);
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ctx->tmp_len = n;
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ret += n;
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break;
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}
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n -= n % 3;
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ctx->buf_len =
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EVP_EncodeBlock((unsigned char *)ctx->buf,
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(const unsigned char *)in, n);
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OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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ret += n;
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}
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} else {
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if (!EVP_EncodeUpdate(ctx->base64,
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(unsigned char *)ctx->buf, &ctx->buf_len,
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(unsigned char *)in, n))
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return ((ret == 0) ? -1 : ret);
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OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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ret += n;
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}
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inl -= n;
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in += n;
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ctx->buf_off = 0;
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n = ctx->buf_len;
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while (n > 0) {
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i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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return ((ret == 0) ? i : ret);
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}
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OPENSSL_assert(i <= n);
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n -= i;
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ctx->buf_off += i;
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OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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}
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ctx->buf_len = 0;
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ctx->buf_off = 0;
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}
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return ret;
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}
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static long b64_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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BIO_B64_CTX *ctx;
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long ret = 1;
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int i;
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BIO *next;
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ctx = (BIO_B64_CTX *)BIO_get_data(b);
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next = BIO_next(b);
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if ((ctx == NULL) || (next == NULL))
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return 0;
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switch (cmd) {
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case BIO_CTRL_RESET:
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ctx->cont = 1;
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ctx->start = 1;
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ctx->encode = B64_NONE;
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_CTRL_EOF: /* More to read */
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if (ctx->cont <= 0)
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ret = 1;
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else
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_CTRL_WPENDING: /* More to write in buffer */
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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ret = ctx->buf_len - ctx->buf_off;
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if ((ret == 0) && (ctx->encode != B64_NONE)
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&& (EVP_ENCODE_CTX_num(ctx->base64) != 0))
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ret = 1;
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else if (ret <= 0)
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_CTRL_PENDING: /* More to read in buffer */
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OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
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ret = ctx->buf_len - ctx->buf_off;
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if (ret <= 0)
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_CTRL_FLUSH:
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/* do a final write */
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again:
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while (ctx->buf_len != ctx->buf_off) {
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i = b64_write(b, NULL, 0);
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if (i < 0)
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return i;
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}
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if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
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if (ctx->tmp_len != 0) {
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ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
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(unsigned char *)ctx->tmp,
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ctx->tmp_len);
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ctx->buf_off = 0;
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ctx->tmp_len = 0;
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goto again;
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}
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} else if (ctx->encode != B64_NONE
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&& EVP_ENCODE_CTX_num(ctx->base64) != 0) {
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ctx->buf_off = 0;
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EVP_EncodeFinal(ctx->base64,
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(unsigned char *)ctx->buf, &(ctx->buf_len));
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/* push out the bytes */
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goto again;
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}
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/* Finally flush the underlying BIO */
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ret = BIO_ctrl(next, cmd, num, ptr);
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break;
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case BIO_C_DO_STATE_MACHINE:
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BIO_clear_retry_flags(b);
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ret = BIO_ctrl(next, cmd, num, ptr);
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BIO_copy_next_retry(b);
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break;
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case BIO_CTRL_DUP:
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break;
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case BIO_CTRL_INFO:
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case BIO_CTRL_GET:
|
|
case BIO_CTRL_SET:
|
|
default:
|
|
ret = BIO_ctrl(next, cmd, num, ptr);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static long b64_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
|
|
{
|
|
long ret = 1;
|
|
BIO *next = BIO_next(b);
|
|
|
|
if (next == NULL)
|
|
return 0;
|
|
switch (cmd) {
|
|
default:
|
|
ret = BIO_callback_ctrl(next, cmd, fp);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int b64_puts(BIO *b, const char *str)
|
|
{
|
|
return b64_write(b, str, strlen(str));
|
|
}
|