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content_encoding: accept up to 4 unknown trailer bytes after raw deflate data 

Some servers issue raw deflate data that may be followed by an undocumented
trailer. This commit makes curl tolerate such a trailer of up to 4 bytes
before considering the data is in error.

Reported-by: clbr on github
Fixes #2719
This commit is contained in:
Patrick Monnerat 2018-07-12 22:46:15 +02:00
parent 5b511b0958
commit f8be737d8f
1 changed files with 15 additions and 11 deletions
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26
lib/content_encoding.c
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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -71,13 +71,13 @@
#define RESERVED 0xE0 /* bits 5..7: reserved */
typedef enum {
ZLIB_UNINIT, /* uninitialized */
ZLIB_INIT, /* initialized */
ZLIB_INFLATING, /* Inflating started. */
ZLIB_GZIP_HEADER, /* reading gzip header */
ZLIB_GZIP_TRAILER, /* reading gzip trailer */
ZLIB_GZIP_INFLATING, /* inflating gzip stream */
ZLIB_INIT_GZIP /* initialized in transparent gzip mode */
ZLIB_UNINIT, /* uninitialized */
ZLIB_INIT, /* initialized */
ZLIB_INFLATING, /* inflating started. */
ZLIB_EXTERNAL_TRAILER, /* reading external trailer */
ZLIB_GZIP_HEADER, /* reading gzip header */
ZLIB_GZIP_INFLATING, /* inflating gzip stream */
ZLIB_INIT_GZIP /* initialized in transparent gzip mode */
} zlibInitState;
/* Writer parameters. */
@ -150,8 +150,8 @@ static CURLcode process_trailer(struct connectdata *conn, zlib_params *zp)
if(result || !zp->trailerlen)
result = exit_zlib(conn, z, &zp->zlib_init, result);
else {
/* Only occurs for gzip with zlib < 1.2.0.4. */
zp->zlib_init = ZLIB_GZIP_TRAILER;
/* Only occurs for gzip with zlib < 1.2.0.4 or raw deflate. */
zp->zlib_init = ZLIB_EXTERNAL_TRAILER;
}
return result;
}
@ -233,6 +233,7 @@ static CURLcode inflate_stream(struct connectdata *conn,
z->next_in = orig_in;
z->avail_in = nread;
zp->zlib_init = ZLIB_INFLATING;
zp->trailerlen = 4; /* Tolerate up to 4 unknown trailer bytes. */
done = FALSE;
break;
}
@ -287,6 +288,9 @@ static CURLcode deflate_unencode_write(struct connectdata *conn,
z->next_in = (Bytef *) buf;
z->avail_in = (uInt) nbytes;
if(zp->zlib_init == ZLIB_EXTERNAL_TRAILER)
return process_trailer(conn, zp);
/* Now uncompress the data */
return inflate_stream(conn, writer, ZLIB_INFLATING);
}
@ -532,7 +536,7 @@ static CURLcode gzip_unencode_write(struct connectdata *conn,
}
break;
case ZLIB_GZIP_TRAILER:
case ZLIB_EXTERNAL_TRAILER:
z->next_in = (Bytef *) buf;
z->avail_in = (uInt) nbytes;
return process_trailer(conn, zp);