| /* 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 <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 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, |
| }; |
| |
| 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)) |
| 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); |
| } |