X-Git-Url: https://code.wpia.club/?a=blobdiff_plain;f=lib%2Fopenssl%2Fcrypto%2Fevp%2Fbio_ok.c;fp=lib%2Fopenssl%2Fcrypto%2Fevp%2Fbio_ok.c;h=e64335353fd51af6eafb4ee21696626fc3c06d88;hb=9ff1530871deeb0f7eaa35ca0db6630724045e4a;hp=0000000000000000000000000000000000000000;hpb=25b73076b01ae059da1a2e9a1677e00788ada620;p=cassiopeia.git

diff --git a/lib/openssl/crypto/evp/bio_ok.c b/lib/openssl/crypto/evp/bio_ok.c
new file mode 100644
index 0000000..e643353
--- /dev/null
+++ b/lib/openssl/crypto/evp/bio_ok.c
@@ -0,0 +1,624 @@
+/* crypto/evp/bio_ok.c */
+/* 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.]
+ */
+
+/*
+	From: Arne Ansper <arne@cyber.ee>
+
+	Why BIO_f_reliable?
+
+	I wrote function which took BIO* as argument, read data from it
+	and processed it. Then I wanted to store the input file in 
+	encrypted form. OK I pushed BIO_f_cipher to the BIO stack
+	and everything was OK. BUT if user types wrong password 
+	BIO_f_cipher outputs only garbage and my function crashes. Yes
+	I can and I should fix my function, but BIO_f_cipher is 
+	easy way to add encryption support to many existing applications
+	and it's hard to debug and fix them all. 
+
+	So I wanted another BIO which would catch the incorrect passwords and
+	file damages which cause garbage on BIO_f_cipher's output. 
+
+	The easy way is to push the BIO_f_md and save the checksum at 
+	the end of the file. However there are several problems with this
+	approach:
+
+	1) you must somehow separate checksum from actual data. 
+	2) you need lot's of memory when reading the file, because you 
+	must read to the end of the file and verify the checksum before
+	letting the application to read the data. 
+	
+	BIO_f_reliable tries to solve both problems, so that you can 
+	read and write arbitrary long streams using only fixed amount
+	of memory.
+
+	BIO_f_reliable splits data stream into blocks. Each block is prefixed
+	with it's length and suffixed with it's digest. So you need only 
+	several Kbytes of memory to buffer single block before verifying 
+	it's digest. 
+
+	BIO_f_reliable goes further and adds several important capabilities:
+
+	1) the digest of the block is computed over the whole stream 
+	-- so nobody can rearrange the blocks or remove or replace them.
+
+	2) to detect invalid passwords right at the start BIO_f_reliable 
+	adds special prefix to the stream. In order to avoid known plain-text
+	attacks this prefix is generated as follows:
+
+		*) digest is initialized with random seed instead of 
+		standardized one.
+		*) same seed is written to output
+		*) well-known text is then hashed and the output 
+		of the digest is also written to output.
+
+	reader can now read the seed from stream, hash the same string
+	and then compare the digest output.
+
+	Bad things: BIO_f_reliable knows what's going on in EVP_Digest. I 
+	initially wrote and tested this code on x86 machine and wrote the
+	digests out in machine-dependent order :( There are people using
+	this code and I cannot change this easily without making existing
+	data files unreadable.
+
+*/
+
+#include <stdio.h>
+#include <errno.h>
+#include <assert.h>
+#include "cryptlib.h"
+#include <openssl/buffer.h>
+#include <openssl/bio.h>
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+
+static int ok_write(BIO *h, const char *buf, int num);
+static int ok_read(BIO *h, char *buf, int size);
+static long ok_ctrl(BIO *h, int cmd, long arg1, void *arg2);
+static int ok_new(BIO *h);
+static int ok_free(BIO *data);
+static long ok_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
+
+static int sig_out(BIO* b);
+static int sig_in(BIO* b);
+static int block_out(BIO* b);
+static int block_in(BIO* b);
+#define OK_BLOCK_SIZE	(1024*4)
+#define OK_BLOCK_BLOCK	4
+#define IOBS		(OK_BLOCK_SIZE+ OK_BLOCK_BLOCK+ 3*EVP_MAX_MD_SIZE)
+#define WELLKNOWN "The quick brown fox jumped over the lazy dog's back."
+
+typedef struct ok_struct
+	{
+	size_t buf_len;
+	size_t buf_off;
+	size_t buf_len_save;
+	size_t buf_off_save;
+	int cont;		/* <= 0 when finished */
+	int finished;
+	EVP_MD_CTX md;
+	int blockout;		/* output block is ready */ 
+	int sigio;		/* must process signature */
+	unsigned char buf[IOBS];
+	} BIO_OK_CTX;
+
+static BIO_METHOD methods_ok=
+	{
+	BIO_TYPE_CIPHER,"reliable",
+	ok_write,
+	ok_read,
+	NULL, /* ok_puts, */
+	NULL, /* ok_gets, */
+	ok_ctrl,
+	ok_new,
+	ok_free,
+	ok_callback_ctrl,
+	};
+
+BIO_METHOD *BIO_f_reliable(void)
+	{
+	return(&methods_ok);
+	}
+
+static int ok_new(BIO *bi)
+	{
+	BIO_OK_CTX *ctx;
+
+	ctx=(BIO_OK_CTX *)OPENSSL_malloc(sizeof(BIO_OK_CTX));
+	if (ctx == NULL) return(0);
+
+	ctx->buf_len=0;
+	ctx->buf_off=0;
+	ctx->buf_len_save=0;
+	ctx->buf_off_save=0;
+	ctx->cont=1;
+	ctx->finished=0;
+	ctx->blockout= 0;
+	ctx->sigio=1;
+
+	EVP_MD_CTX_init(&ctx->md);
+
+	bi->init=0;
+	bi->ptr=(char *)ctx;
+	bi->flags=0;
+	return(1);
+	}
+
+static int ok_free(BIO *a)
+	{
+	if (a == NULL) return(0);
+	EVP_MD_CTX_cleanup(&((BIO_OK_CTX *)a->ptr)->md);
+	OPENSSL_cleanse(a->ptr,sizeof(BIO_OK_CTX));
+	OPENSSL_free(a->ptr);
+	a->ptr=NULL;
+	a->init=0;
+	a->flags=0;
+	return(1);
+	}
+	
+static int ok_read(BIO *b, char *out, int outl)
+	{
+	int ret=0,i,n;
+	BIO_OK_CTX *ctx;
+
+	if (out == NULL) return(0);
+	ctx=(BIO_OK_CTX *)b->ptr;
+
+	if ((ctx == NULL) || (b->next_bio == NULL) || (b->init == 0)) return(0);
+
+	while(outl > 0)
+		{
+
+		/* copy clean bytes to output buffer */
+		if (ctx->blockout)
+			{
+			i=ctx->buf_len-ctx->buf_off;
+			if (i > outl) i=outl;
+			memcpy(out,&(ctx->buf[ctx->buf_off]),i);
+			ret+=i;
+			out+=i;
+			outl-=i;
+			ctx->buf_off+=i;
+
+			/* all clean bytes are out */
+			if (ctx->buf_len == ctx->buf_off)
+				{
+				ctx->buf_off=0;
+
+				/* copy start of the next block into proper place */
+				if(ctx->buf_len_save- ctx->buf_off_save > 0)
+					{
+					ctx->buf_len= ctx->buf_len_save- ctx->buf_off_save;
+					memmove(ctx->buf, &(ctx->buf[ctx->buf_off_save]),
+							ctx->buf_len);
+					}
+				else
+					{
+					ctx->buf_len=0;
+					}
+				ctx->blockout= 0;
+				}
+			}
+	
+		/* output buffer full -- cancel */
+		if (outl == 0) break;
+
+		/* no clean bytes in buffer -- fill it */
+		n=IOBS- ctx->buf_len;
+		i=BIO_read(b->next_bio,&(ctx->buf[ctx->buf_len]),n);
+
+		if (i <= 0) break;	/* nothing new */
+
+		ctx->buf_len+= i;
+
+		/* no signature yet -- check if we got one */
+		if (ctx->sigio == 1)
+			{
+			if (!sig_in(b))
+				{
+				BIO_clear_retry_flags(b);
+				return 0;
+				}
+			}
+
+		/* signature ok -- check if we got block */
+		if (ctx->sigio == 0)
+			{
+			if (!block_in(b))
+				{
+				BIO_clear_retry_flags(b);
+				return 0;
+				}
+			}
+
+		/* invalid block -- cancel */
+		if (ctx->cont <= 0) break;
+
+		}
+
+	BIO_clear_retry_flags(b);
+	BIO_copy_next_retry(b);
+	return(ret);
+	}
+
+static int ok_write(BIO *b, const char *in, int inl)
+	{
+	int ret=0,n,i;
+	BIO_OK_CTX *ctx;
+
+	if (inl <= 0) return inl;
+
+	ctx=(BIO_OK_CTX *)b->ptr;
+	ret=inl;
+
+	if ((ctx == NULL) || (b->next_bio == NULL) || (b->init == 0)) return(0);
+
+	if(ctx->sigio && !sig_out(b))
+		return 0;
+
+	do{
+		BIO_clear_retry_flags(b);
+		n=ctx->buf_len-ctx->buf_off;
+		while (ctx->blockout && n > 0)
+			{
+			i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
+			if (i <= 0)
+				{
+				BIO_copy_next_retry(b);
+				if(!BIO_should_retry(b))
+					ctx->cont= 0;
+				return(i);
+				}
+			ctx->buf_off+=i;
+			n-=i;
+			}
+
+		/* at this point all pending data has been written */
+		ctx->blockout= 0;
+		if (ctx->buf_len == ctx->buf_off)
+			{
+			ctx->buf_len=OK_BLOCK_BLOCK;
+			ctx->buf_off=0;
+			}
+	
+		if ((in == NULL) || (inl <= 0)) return(0);
+
+		n= (inl+ ctx->buf_len > OK_BLOCK_SIZE+ OK_BLOCK_BLOCK) ? 
+			(int)(OK_BLOCK_SIZE+OK_BLOCK_BLOCK-ctx->buf_len) : inl;
+
+		memcpy((unsigned char *)(&(ctx->buf[ctx->buf_len])),(unsigned char *)in,n);
+		ctx->buf_len+= n;
+		inl-=n;
+		in+=n;
+
+		if(ctx->buf_len >= OK_BLOCK_SIZE+ OK_BLOCK_BLOCK)
+			{
+			if (!block_out(b))
+				{
+				BIO_clear_retry_flags(b);
+				return 0;
+				}
+			}
+	}while(inl > 0);
+
+	BIO_clear_retry_flags(b);
+	BIO_copy_next_retry(b);
+	return(ret);
+	}
+
+static long ok_ctrl(BIO *b, int cmd, long num, void *ptr)
+	{
+	BIO_OK_CTX *ctx;
+	EVP_MD *md;
+	const EVP_MD **ppmd;
+	long ret=1;
+	int i;
+
+	ctx=b->ptr;
+
+	switch (cmd)
+		{
+	case BIO_CTRL_RESET:
+		ctx->buf_len=0;
+		ctx->buf_off=0;
+		ctx->buf_len_save=0;
+		ctx->buf_off_save=0;
+		ctx->cont=1;
+		ctx->finished=0;
+		ctx->blockout= 0;
+		ctx->sigio=1;
+		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_PENDING: /* More to read in buffer */
+	case BIO_CTRL_WPENDING: /* More to read in buffer */
+		ret=ctx->blockout ? ctx->buf_len-ctx->buf_off : 0;
+		if (ret <= 0)
+			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
+		break;
+	case BIO_CTRL_FLUSH:
+		/* do a final write */
+		if(ctx->blockout == 0)
+			if (!block_out(b))
+				return 0;
+
+		while (ctx->blockout)
+			{
+			i=ok_write(b,NULL,0);
+			if (i < 0)
+				{
+				ret=i;
+				break;
+				}
+			}
+
+		ctx->finished=1;
+		ctx->buf_off=ctx->buf_len=0;
+		ctx->cont=(int)ret;
+		
+		/* 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_INFO:
+		ret=(long)ctx->cont;
+		break;
+	case BIO_C_SET_MD:
+		md=ptr;
+		if (!EVP_DigestInit_ex(&ctx->md, md, NULL))
+			return 0;
+		b->init=1;
+		break;
+	case BIO_C_GET_MD:
+		if (b->init)
+			{
+			ppmd=ptr;
+			*ppmd=ctx->md.digest;
+			}
+		else
+			ret=0;
+		break;
+	default:
+		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
+		break;
+		}
+	return(ret);
+	}
+
+static long ok_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 void longswap(void *_ptr, size_t len)
+{	const union { long one; char little; } is_endian = {1};
+
+	if (is_endian.little) {
+		size_t i;
+		unsigned char *p=_ptr,c;
+
+		for(i= 0;i < len;i+= 4) {
+			c=p[0],p[0]=p[3],p[3]=c;
+			c=p[1],p[1]=p[2],p[2]=c;
+		}
+	}
+}
+
+static int sig_out(BIO* b)
+	{
+	BIO_OK_CTX *ctx;
+	EVP_MD_CTX *md;
+
+	ctx=b->ptr;
+	md=&ctx->md;
+
+	if(ctx->buf_len+ 2* md->digest->md_size > OK_BLOCK_SIZE) return 1;
+
+	if (!EVP_DigestInit_ex(md, md->digest, NULL))
+		goto berr;
+	/* FIXME: there's absolutely no guarantee this makes any sense at all,
+	 * particularly now EVP_MD_CTX has been restructured.
+	 */
+	RAND_pseudo_bytes(md->md_data, md->digest->md_size);
+	memcpy(&(ctx->buf[ctx->buf_len]), md->md_data, md->digest->md_size);
+	longswap(&(ctx->buf[ctx->buf_len]), md->digest->md_size);
+	ctx->buf_len+= md->digest->md_size;
+
+	if (!EVP_DigestUpdate(md, WELLKNOWN, strlen(WELLKNOWN)))
+		goto berr;
+	if (!EVP_DigestFinal_ex(md, &(ctx->buf[ctx->buf_len]), NULL))
+		goto berr;
+	ctx->buf_len+= md->digest->md_size;
+	ctx->blockout= 1;
+	ctx->sigio= 0;
+	return 1;
+	berr:
+	BIO_clear_retry_flags(b);
+	return 0;
+	}
+
+static int sig_in(BIO* b)
+	{
+	BIO_OK_CTX *ctx;
+	EVP_MD_CTX *md;
+	unsigned char tmp[EVP_MAX_MD_SIZE];
+	int ret= 0;
+
+	ctx=b->ptr;
+	md=&ctx->md;
+
+	if((int)(ctx->buf_len-ctx->buf_off) < 2*md->digest->md_size) return 1;
+
+	if (!EVP_DigestInit_ex(md, md->digest, NULL))
+		goto berr;
+	memcpy(md->md_data, &(ctx->buf[ctx->buf_off]), md->digest->md_size);
+	longswap(md->md_data, md->digest->md_size);
+	ctx->buf_off+= md->digest->md_size;
+
+	if (!EVP_DigestUpdate(md, WELLKNOWN, strlen(WELLKNOWN)))
+		goto berr;
+	if (!EVP_DigestFinal_ex(md, tmp, NULL))
+		goto berr;
+	ret= memcmp(&(ctx->buf[ctx->buf_off]), tmp, md->digest->md_size) == 0;
+	ctx->buf_off+= md->digest->md_size;
+	if(ret == 1)
+		{
+		ctx->sigio= 0;
+		if(ctx->buf_len != ctx->buf_off)
+			{
+			memmove(ctx->buf, &(ctx->buf[ctx->buf_off]), ctx->buf_len- ctx->buf_off);
+			}
+		ctx->buf_len-= ctx->buf_off;
+		ctx->buf_off= 0;
+		}
+	else
+		{
+		ctx->cont= 0;
+		}
+	return 1;
+	berr:
+	BIO_clear_retry_flags(b);
+	return 0;
+	}
+
+static int block_out(BIO* b)
+	{
+	BIO_OK_CTX *ctx;
+	EVP_MD_CTX *md;
+	unsigned long tl;
+
+	ctx=b->ptr;
+	md=&ctx->md;
+
+	tl= ctx->buf_len- OK_BLOCK_BLOCK;
+	ctx->buf[0]=(unsigned char)(tl>>24);
+	ctx->buf[1]=(unsigned char)(tl>>16);
+	ctx->buf[2]=(unsigned char)(tl>>8);
+	ctx->buf[3]=(unsigned char)(tl);
+	if (!EVP_DigestUpdate(md,
+		(unsigned char*) &(ctx->buf[OK_BLOCK_BLOCK]), tl))
+		goto berr;
+	if (!EVP_DigestFinal_ex(md, &(ctx->buf[ctx->buf_len]), NULL))
+		goto berr;
+	ctx->buf_len+= md->digest->md_size;
+	ctx->blockout= 1;
+	return 1;
+	berr:
+	BIO_clear_retry_flags(b);
+	return 0;
+	}
+
+static int block_in(BIO* b)
+	{
+	BIO_OK_CTX *ctx;
+	EVP_MD_CTX *md;
+	unsigned long tl= 0;
+	unsigned char tmp[EVP_MAX_MD_SIZE];
+
+	ctx=b->ptr;
+	md=&ctx->md;
+
+	assert(sizeof(tl)>=OK_BLOCK_BLOCK);	/* always true */
+	tl =ctx->buf[0]; tl<<=8;
+	tl|=ctx->buf[1]; tl<<=8;
+	tl|=ctx->buf[2]; tl<<=8;
+	tl|=ctx->buf[3];
+
+	if (ctx->buf_len < tl+ OK_BLOCK_BLOCK+ md->digest->md_size) return 1;
+ 
+	if (!EVP_DigestUpdate(md,
+			(unsigned char*) &(ctx->buf[OK_BLOCK_BLOCK]), tl))
+		goto berr;
+	if (!EVP_DigestFinal_ex(md, tmp, NULL))
+		goto berr;
+	if(memcmp(&(ctx->buf[tl+ OK_BLOCK_BLOCK]), tmp, md->digest->md_size) == 0)
+		{
+		/* there might be parts from next block lurking around ! */
+		ctx->buf_off_save= tl+ OK_BLOCK_BLOCK+ md->digest->md_size;
+		ctx->buf_len_save= ctx->buf_len;
+		ctx->buf_off= OK_BLOCK_BLOCK;
+		ctx->buf_len= tl+ OK_BLOCK_BLOCK;
+		ctx->blockout= 1;
+		}
+	else
+		{
+		ctx->cont= 0;
+		}
+	return 1;
+	berr:
+	BIO_clear_retry_flags(b);
+	return 0;
+	}
+