450 lines
11 KiB
C
450 lines
11 KiB
C
/*
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* Copyright 2006-2021 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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/*
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* Experimental ASN1 BIO. When written through the data is converted to an
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* ASN1 string type: default is OCTET STRING. Additional functions can be
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* provided to add prefix and suffix data.
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*/
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#include <string.h>
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#include "internal/bio.h"
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#include <openssl/asn1.h>
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#include "internal/cryptlib.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,
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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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BIO_TYPE_ASN1,
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"asn1",
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/* TODO: Convert to new style write function */
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bwrite_conv,
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asn1_bio_write,
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/* TODO: Convert to new style read function */
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bread_conv,
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asn1_bio_read,
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asn1_bio_puts,
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asn1_bio_gets,
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asn1_bio_ctrl,
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asn1_bio_new,
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asn1_bio_free,
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asn1_bio_callback_ctrl,
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};
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const BIO_METHOD *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 asn1_bio_new(BIO *b)
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{
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BIO_ASN1_BUF_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
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if (ctx == NULL)
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return 0;
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if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE)) {
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OPENSSL_free(ctx);
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return 0;
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}
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BIO_set_data(b, ctx);
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BIO_set_init(b, 1);
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return 1;
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}
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static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
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{
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if ((ctx->buf = OPENSSL_malloc(size)) == NULL) {
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ASN1err(ASN1_F_ASN1_BIO_INIT, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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ctx->bufsize = size;
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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->state = ASN1_STATE_START;
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return 1;
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}
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static int asn1_bio_free(BIO *b)
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{
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BIO_ASN1_BUF_CTX *ctx;
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if (b == NULL)
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return 0;
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ctx = BIO_get_data(b);
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if (ctx == NULL)
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return 0;
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if (ctx->prefix_free != NULL)
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ctx->prefix_free(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
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if (ctx->suffix_free != NULL)
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ctx->suffix_free(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
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OPENSSL_free(ctx->buf);
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OPENSSL_free(ctx);
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BIO_set_data(b, NULL);
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BIO_set_init(b, 0);
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return 1;
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}
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static int 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;
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unsigned char *p;
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BIO *next;
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ctx = BIO_get_data(b);
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next = BIO_next(b);
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if (in == NULL || inl < 0 || ctx == NULL || next == 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 -1;
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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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ctx->buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
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if (!ossl_assert(ctx->buflen <= ctx->bufsize))
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return -1;
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p = ctx->buf;
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ASN1_put_object(&p, 0, inl, 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(next, 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(next, in, wrmax);
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if (ret <= 0)
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goto done;
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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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case ASN1_STATE_POST_COPY:
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case ASN1_STATE_DONE:
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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 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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{
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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(BIO_next(b), ctx->ex_buf + ctx->ex_pos, 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, &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 asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
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asn1_ps_func *setup,
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asn1_bio_state_t ex_state,
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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 asn1_bio_read(BIO *b, char *in, int inl)
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{
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BIO *next = BIO_next(b);
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if (next == NULL)
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return 0;
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return BIO_read(next, in, inl);
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}
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static int 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 asn1_bio_gets(BIO *b, char *str, int size)
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{
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BIO *next = BIO_next(b);
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if (next == NULL)
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return 0;
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return BIO_gets(next, str, size);
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}
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static long asn1_bio_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
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{
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BIO *next = BIO_next(b);
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if (next == NULL)
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return 0;
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return BIO_callback_ctrl(next, cmd, fp);
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}
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static long 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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BIO *next;
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ctx = BIO_get_data(b);
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if (ctx == NULL)
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return 0;
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next = BIO_next(b);
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switch (cmd) {
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case BIO_C_SET_PREFIX:
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ex_func = arg2;
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ctx->prefix = ex_func->ex_func;
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ctx->prefix_free = ex_func->ex_free_func;
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break;
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case BIO_C_GET_PREFIX:
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ex_func = arg2;
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ex_func->ex_func = ctx->prefix;
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ex_func->ex_free_func = ctx->prefix_free;
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break;
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case BIO_C_SET_SUFFIX:
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ex_func = arg2;
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ctx->suffix = ex_func->ex_func;
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ctx->suffix_free = ex_func->ex_free_func;
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break;
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case BIO_C_GET_SUFFIX:
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ex_func = arg2;
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ex_func->ex_func = ctx->suffix;
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ex_func->ex_free_func = ctx->suffix_free;
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break;
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case BIO_C_SET_EX_ARG:
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ctx->ex_arg = arg2;
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break;
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case BIO_C_GET_EX_ARG:
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*(void **)arg2 = ctx->ex_arg;
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break;
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case BIO_CTRL_FLUSH:
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if (next == NULL)
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return 0;
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/* Call post function if possible */
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if (ctx->state == ASN1_STATE_HEADER) {
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if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
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ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
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return 0;
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}
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if (ctx->state == ASN1_STATE_POST_COPY) {
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ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
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ASN1_STATE_DONE);
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if (ret <= 0)
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return ret;
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}
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if (ctx->state == ASN1_STATE_DONE)
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return BIO_ctrl(next, cmd, arg1, arg2);
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else {
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BIO_clear_retry_flags(b);
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return 0;
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}
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default:
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if (next == NULL)
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return 0;
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return BIO_ctrl(next, cmd, arg1, arg2);
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}
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return ret;
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}
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static int asn1_bio_set_ex(BIO *b, int cmd,
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asn1_ps_func *ex_func, asn1_ps_func *ex_free_func)
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{
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BIO_ASN1_EX_FUNCS extmp;
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extmp.ex_func = ex_func;
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extmp.ex_free_func = ex_free_func;
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return BIO_ctrl(b, cmd, 0, &extmp);
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}
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static int asn1_bio_get_ex(BIO *b, int cmd,
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asn1_ps_func **ex_func,
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asn1_ps_func **ex_free_func)
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{
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BIO_ASN1_EX_FUNCS extmp;
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int ret;
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ret = BIO_ctrl(b, cmd, 0, &extmp);
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if (ret > 0) {
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*ex_func = extmp.ex_func;
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*ex_free_func = extmp.ex_free_func;
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}
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return ret;
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}
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int BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix,
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asn1_ps_func *prefix_free)
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{
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return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
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}
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int BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix,
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asn1_ps_func **pprefix_free)
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{
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return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
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}
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int BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix,
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asn1_ps_func *suffix_free)
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{
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return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
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}
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int BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix,
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asn1_ps_func **psuffix_free)
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{
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return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);
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}
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