blob: 15f233be642bc4704a54d8eaf6c1dc60f27d9e88 [file] [log] [blame]
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/asn1.h>
#include <assert.h>
#include <string.h>
#include <openssl/bio.h>
#include <openssl/mem.h>
/* Must be large enough for biggest tag+length */
#define DEFAULT_ASN1_BUF_SIZE 20
typedef enum
{
ASN1_STATE_START,
ASN1_STATE_PRE_COPY,
ASN1_STATE_HEADER,
ASN1_STATE_HEADER_COPY,
ASN1_STATE_DATA_COPY,
ASN1_STATE_POST_COPY,
ASN1_STATE_DONE
} asn1_bio_state_t;
typedef struct BIO_ASN1_EX_FUNCS_st
{
asn1_ps_func *ex_func;
asn1_ps_func *ex_free_func;
} BIO_ASN1_EX_FUNCS;
typedef struct BIO_ASN1_BUF_CTX_t
{
/* Internal state */
asn1_bio_state_t state;
/* Internal buffer */
unsigned char *buf;
/* Size of buffer */
int bufsize;
/* Current position in buffer */
int bufpos;
/* Current buffer length */
int buflen;
/* Amount of data to copy */
int copylen;
/* Class and tag to use */
int asn1_class, asn1_tag;
asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free;
/* Extra buffer for prefix and suffix data */
unsigned char *ex_buf;
int ex_len;
int ex_pos;
void *ex_arg;
} BIO_ASN1_BUF_CTX;
static int asn1_bio_write(BIO *h, const char *buf,int num);
static int asn1_bio_read(BIO *h, char *buf, int size);
static int asn1_bio_puts(BIO *h, const char *str);
static int asn1_bio_gets(BIO *h, char *str, int size);
static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int asn1_bio_new(BIO *h);
static int asn1_bio_free(BIO *data);
static long asn1_bio_callback_ctrl(BIO *h, int cmd, bio_info_cb fp);
static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
asn1_ps_func *cleanup, asn1_bio_state_t next);
static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
asn1_ps_func *setup,
asn1_bio_state_t ex_state,
asn1_bio_state_t other_state);
static const BIO_METHOD methods_asn1=
{
BIO_TYPE_ASN1,
"asn1",
asn1_bio_write,
asn1_bio_read,
asn1_bio_puts,
asn1_bio_gets,
asn1_bio_ctrl,
asn1_bio_new,
asn1_bio_free,
asn1_bio_callback_ctrl,
};
const BIO_METHOD *BIO_f_asn1(void)
{
return(&methods_asn1);
}
static int asn1_bio_new(BIO *b)
{
BIO_ASN1_BUF_CTX *ctx;
ctx = OPENSSL_malloc(sizeof(BIO_ASN1_BUF_CTX));
if (!ctx)
return 0;
if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE))
{
OPENSSL_free(ctx);
return 0;
}
b->init = 1;
b->ptr = (char *)ctx;
b->flags = 0;
return 1;
}
static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
{
ctx->buf = OPENSSL_malloc(size);
if (!ctx->buf)
return 0;
ctx->bufsize = size;
ctx->bufpos = 0;
ctx->buflen = 0;
ctx->copylen = 0;
ctx->asn1_class = V_ASN1_UNIVERSAL;
ctx->asn1_tag = V_ASN1_OCTET_STRING;
ctx->ex_buf = 0;
ctx->ex_pos = 0;
ctx->ex_len = 0;
ctx->state = ASN1_STATE_START;
return 1;
}
static int asn1_bio_free(BIO *b)
{
BIO_ASN1_BUF_CTX *ctx;
ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
if (ctx == NULL)
return 0;
if (ctx->buf)
OPENSSL_free(ctx->buf);
OPENSSL_free(ctx);
b->init = 0;
b->ptr = NULL;
b->flags = 0;
return 1;
}
static int asn1_bio_write(BIO *b, const char *in , int inl)
{
BIO_ASN1_BUF_CTX *ctx;
int wrmax, wrlen, ret;
unsigned char *p;
if (!in || (inl < 0) || (b->next_bio == NULL))
return 0;
ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
if (ctx == NULL)
return 0;
wrlen = 0;
ret = -1;
for(;;)
{
switch (ctx->state)
{
/* Setup prefix data, call it */
case ASN1_STATE_START:
if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
return 0;
break;
/* Copy any pre data first */
case ASN1_STATE_PRE_COPY:
ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
ASN1_STATE_HEADER);
if (ret <= 0)
goto done;
break;
case ASN1_STATE_HEADER:
ctx->buflen =
ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
assert(ctx->buflen <= ctx->bufsize);
p = ctx->buf;
ASN1_put_object(&p, 0, inl,
ctx->asn1_tag, ctx->asn1_class);
ctx->copylen = inl;
ctx->state = ASN1_STATE_HEADER_COPY;
break;
case ASN1_STATE_HEADER_COPY:
ret = BIO_write(b->next_bio,
ctx->buf + ctx->bufpos, ctx->buflen);
if (ret <= 0)
goto done;
ctx->buflen -= ret;
if (ctx->buflen)
ctx->bufpos += ret;
else
{
ctx->bufpos = 0;
ctx->state = ASN1_STATE_DATA_COPY;
}
break;
case ASN1_STATE_DATA_COPY:
if (inl > ctx->copylen)
wrmax = ctx->copylen;
else
wrmax = inl;
ret = BIO_write(b->next_bio, in, wrmax);
if (ret <= 0)
break;
wrlen += ret;
ctx->copylen -= ret;
in += ret;
inl -= ret;
if (ctx->copylen == 0)
ctx->state = ASN1_STATE_HEADER;
if (inl == 0)
goto done;
break;
default:
BIO_clear_retry_flags(b);
return 0;
}
}
done:
BIO_clear_retry_flags(b);
BIO_copy_next_retry(b);
return (wrlen > 0) ? wrlen : ret;
}
static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
asn1_ps_func *cleanup, asn1_bio_state_t next)
{
int ret;
if (ctx->ex_len <= 0)
return 1;
for(;;)
{
ret = BIO_write(b->next_bio, ctx->ex_buf + ctx->ex_pos,
ctx->ex_len);
if (ret <= 0)
break;
ctx->ex_len -= ret;
if (ctx->ex_len > 0)
ctx->ex_pos += ret;
else
{
if(cleanup)
cleanup(b, &ctx->ex_buf, &ctx->ex_len,
&ctx->ex_arg);
ctx->state = next;
ctx->ex_pos = 0;
break;
}
}
return ret;
}
static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
asn1_ps_func *setup,
asn1_bio_state_t ex_state,
asn1_bio_state_t other_state)
{
if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg))
{
BIO_clear_retry_flags(b);
return 0;
}
if (ctx->ex_len > 0)
ctx->state = ex_state;
else
ctx->state = other_state;
return 1;
}
static int asn1_bio_read(BIO *b, char *in , int inl)
{
if (!b->next_bio)
return 0;
return BIO_read(b->next_bio, in , inl);
}
static int asn1_bio_puts(BIO *b, const char *str)
{
return asn1_bio_write(b, str, strlen(str));
}
static int asn1_bio_gets(BIO *b, char *str, int size)
{
if (!b->next_bio)
return 0;
return BIO_gets(b->next_bio, str , size);
}
static long asn1_bio_callback_ctrl(BIO *b, int cmd, bio_info_cb fp)
{
if (b->next_bio == NULL) return(0);
return BIO_callback_ctrl(b->next_bio,cmd,fp);
}
static long asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2)
{
BIO_ASN1_BUF_CTX *ctx;
BIO_ASN1_EX_FUNCS *ex_func;
long ret = 1;
ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
if (ctx == NULL)
return 0;
switch(cmd)
{
case BIO_C_SET_PREFIX:
ex_func = arg2;
ctx->prefix = ex_func->ex_func;
ctx->prefix_free = ex_func->ex_free_func;
break;
case BIO_C_GET_PREFIX:
ex_func = arg2;
ex_func->ex_func = ctx->prefix;
ex_func->ex_free_func = ctx->prefix_free;
break;
case BIO_C_SET_SUFFIX:
ex_func = arg2;
ctx->suffix = ex_func->ex_func;
ctx->suffix_free = ex_func->ex_free_func;
break;
case BIO_C_GET_SUFFIX:
ex_func = arg2;
ex_func->ex_func = ctx->suffix;
ex_func->ex_free_func = ctx->suffix_free;
break;
case BIO_C_SET_EX_ARG:
ctx->ex_arg = arg2;
break;
case BIO_C_GET_EX_ARG:
*(void **)arg2 = ctx->ex_arg;
break;
case BIO_CTRL_FLUSH:
if (!b->next_bio)
return 0;
/* Call post function if possible */
if (ctx->state == ASN1_STATE_HEADER)
{
if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
return 0;
}
if (ctx->state == ASN1_STATE_POST_COPY)
{
ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
ASN1_STATE_DONE);
if (ret <= 0)
return ret;
}
if (ctx->state == ASN1_STATE_DONE)
return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
else
{
BIO_clear_retry_flags(b);
return 0;
}
break;
default:
if (!b->next_bio)
return 0;
return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
}
return ret;
}
static int asn1_bio_set_ex(BIO *b, int cmd,
asn1_ps_func *ex_func, asn1_ps_func *ex_free_func)
{
BIO_ASN1_EX_FUNCS extmp;
extmp.ex_func = ex_func;
extmp.ex_free_func = ex_free_func;
return BIO_ctrl(b, cmd, 0, &extmp);
}
static int asn1_bio_get_ex(BIO *b, int cmd,
asn1_ps_func **ex_func, asn1_ps_func **ex_free_func)
{
BIO_ASN1_EX_FUNCS extmp;
int ret;
ret = BIO_ctrl(b, cmd, 0, &extmp);
if (ret > 0)
{
*ex_func = extmp.ex_func;
*ex_free_func = extmp.ex_free_func;
}
return ret;
}
int BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix, asn1_ps_func *prefix_free)
{
return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
}
int BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix, asn1_ps_func **pprefix_free)
{
return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
}
int BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix, asn1_ps_func *suffix_free)
{
return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
}
int BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix, asn1_ps_func **psuffix_free)
{
return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);
}