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/*
* ModSecurity for Apache 2.x, http://www.modsecurity.org/
* Copyright (c) 2004-2013 Trustwave Holdings, Inc. (http://www.trustwave.com/)
*
* You may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* If any of the files related to licensing are missing or if you have any
* other questions related to licensing please contact Trustwave Holdings, Inc.
* directly using the email address security@modsecurity.org.
*/
#include
"msc_crypt.h"
#include
"msc_util.h"
#include
"apr_sha1.h"
#include
"apr_uri.h"
#include
"apr_base64.h"
#include
"acmp.h"
#include
"libxml/HTMLtree.h"
#include
"libxml/uri.h"
#include
<string.h>
/**
* \brief Normalize path in URI
*
* \param msr ModSecurity transaction resource
* \param input The URI to be normalized
*
* \retval input normalized input
* \retval NULL on fail
*/
char
*
normalize_path
(
modsec_rec
*
msr
,
char
*
input
) {
xmlURI
*
uri
=
NULL
;
char
*
parsed_content
=
NULL
;
char
*
content
=
NULL
;
if
(
msr
==
NULL
)
return
NULL
;
if
(
input
==
NULL
)
return
NULL
;
uri
=
xmlParseURI
(
input
);
if
(
uri
!=
NULL
&&
uri
->
path
) {
if
(
uri
->
scheme
) {
content
=
apr_psprintf
(
msr
->
mp
,
"%s://"
,
uri
->
scheme
);
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
content
,
NULL
);
}
if
(
uri
->
server
) {
content
=
apr_psprintf
(
msr
->
mp
,
"%s"
,
uri
->
server
);
if
(
parsed_content
)
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
parsed_content
,
content
,
NULL
);
else
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
content
,
NULL
);
}
if
(
uri
->
port
) {
content
=
apr_psprintf
(
msr
->
mp
,
":%d"
,
uri
->
port
);
if
(
parsed_content
)
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
parsed_content
,
content
,
NULL
);
else
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
content
,
NULL
);
}
if
(
uri
->
path
) {
char
*
Uri
=
NULL
;
int
bytes
=
0
;
/*int i;*/
char
*
relative_link
=
NULL
;
char
*
filename
=
NULL
;
char
*
relative_path
=
NULL
;
char
*
relative_uri
=
NULL
;
filename
=
file_basename
(
msr
->
mp
,
msr
->
r
->
parsed_uri
.
path
);
if
(
filename
==
NULL
||
(
strlen
(
msr
->
r
->
parsed_uri
.
path
)
-
strlen
(
filename
)
<
0
))
return
NULL
;
relative_path
=
apr_pstrndup
(
msr
->
mp
,
msr
->
r
->
parsed_uri
.
path
,
strlen
(
msr
->
r
->
parsed_uri
.
path
)
-
strlen
(
filename
));
relative_uri
=
apr_pstrcat
(
msr
->
mp
,
relative_path
,
uri
->
path
,
NULL
);
relative_link
=
apr_pstrdup
(
msr
->
mp
,
relative_uri
);
xmlNormalizeURIPath
(
relative_link
);
Uri
=
apr_pstrdup
(
msr
->
mp
,
relative_link
);
/*
for(i = 0; i < (int)strlen(Uri); i++) {
if(Uri[i] != '.' && Uri[i] != '/') {
if (i - 1 < 0)
i = 0;
else
i--;
if(Uri[i] == '/')
--bytes;
break;
} else {
bytes++;
}
}
if(bytes >= (int)strlen(uri->path))
return NULL;
*/
content
=
apr_psprintf
(
msr
->
mp
,
"%s"
,
Uri
);
if
(
parsed_content
)
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
parsed_content
,
content
,
NULL
);
else
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
content
,
NULL
);
}
if
(
uri
->
query_raw
) {
content
=
apr_psprintf
(
msr
->
mp
,
"?%s"
,
uri
->
query_raw
);
if
(
parsed_content
)
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
parsed_content
,
content
,
NULL
);
else
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
content
,
NULL
);
}
if
(
uri
->
fragment
) {
content
=
apr_psprintf
(
msr
->
mp
,
"#%s"
,
uri
->
fragment
);
if
(
parsed_content
)
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
parsed_content
,
content
,
NULL
);
else
parsed_content
=
apr_pstrcat
(
msr
->
mp
,
content
,
NULL
);
}
xmlFreeURI
(
uri
);
return
apr_pstrdup
(
msr
->
mp
,
parsed_content
);
}
if
(
uri
!=
NULL
)
xmlFreeURI
(
uri
);
return
apr_pstrdup
(
msr
->
mp
,
input
);
}
/**
* \brief Create a random password
*
* \param mp ModSecurity transaction memory pool
*
* \retval key random key
*/
char
*
getkey
(
apr_pool_t
*
mp
) {
unsigned
char
digest
[
APR_SHA1_DIGESTSIZE
];
char
*
sig
,
*
key
,
*
value
;
apr_sha1_ctx_t
ctx
;
char
salt
[
64
];
apr_generate_random_bytes
(
salt
,
sizeof
(
salt
));
key
=
apr_psprintf
(
mp
,
"%.*s"
,(
int
)
sizeof
(
salt
),
salt
);
apr_sha1_init
(
&
ctx
);
apr_sha1_update
(
&
ctx
, (
const
char
*
)
key
,
strlen
(
key
));
apr_sha1_update
(
&
ctx
,
"\0"
,
1
);
apr_generate_random_bytes
(
salt
,
sizeof
(
salt
));
value
=
apr_psprintf
(
mp
,
"%.*s"
,(
int
)
sizeof
(
salt
),
salt
);
apr_sha1_update
(
&
ctx
,
value
,
strlen
(
value
));
apr_sha1_final
(
digest
,
&
ctx
);
sig
=
apr_pcalloc
(
mp
,
apr_base64_encode_len
(
sizeof
(
digest
)));
apr_base64_encode
(
sig
, (
const
char
*
)
digest
,
sizeof
(
digest
));
return
sig
;
}
/**
* \brief Generate the MAC for a given message
*
* \param msr ModSecurity transaction resource
* \param key The key used within HMAC
* \param key_len Key length
* \param msg The message to generate the MAC
* \param msglen The message length
*
* \retval hex_digest The MAC
*/
char
*
hmac
(
modsec_rec
*
msr
,
const
char
*
key
,
int
key_len
,
unsigned
char
*
msg
,
int
msglen
) {
apr_sha1_ctx_t
ctx
;
unsigned
char
digest
[
APR_SHA1_DIGESTSIZE
];
unsigned
char
hmac_ipad
[
HMAC_PAD_SIZE
],
hmac_opad
[
HMAC_PAD_SIZE
];
unsigned
char
nkey
[
APR_SHA1_DIGESTSIZE
];
unsigned
char
*
hmac_key
=
(
unsigned
char
*
)
key
;
char
hex_digest
[
APR_SHA1_DIGESTSIZE
*
2
],
*
hmac_digest
;
const
char
hex
[]
=
"0123456789abcdef"
;
int
i
;
if
(
key_len
>
HMAC_PAD_SIZE
-
1
) {
hmac_key
=
nkey
;
key_len
=
APR_SHA1_DIGESTSIZE
;
}
memset
((
void
*
)
hmac_ipad
,
0
,
sizeof
(
hmac_ipad
));
memset
((
void
*
)
hmac_opad
,
0
,
sizeof
(
hmac_opad
));
memmove
(
hmac_ipad
,
hmac_key
,
key_len
);
memmove
(
hmac_opad
,
hmac_key
,
key_len
);
for
(
i
=
0
;
i
<
HMAC_PAD_SIZE
-
1
;
i
++
) {
hmac_ipad
[
i
] ^=
0x36
;
hmac_opad
[
i
] ^=
0x5c
;
}
apr_sha1_init
(
&
ctx
);
apr_sha1_update_binary
(
&
ctx
,
hmac_ipad
,
HMAC_PAD_SIZE
-
1
);
apr_sha1_update_binary
(
&
ctx
, (
const
unsigned
char
*
)
msg
,
msglen
);
apr_sha1_final
(
digest
,
&
ctx
);
apr_sha1_init
(
&
ctx
);
apr_sha1_update_binary
(
&
ctx
,
hmac_opad
,
HMAC_PAD_SIZE
-
1
);
apr_sha1_update_binary
(
&
ctx
,
digest
,
sizeof
(
digest
));
apr_sha1_final
(
digest
,
&
ctx
);
hmac_digest
=
hex_digest
;
for
(
i
=
0
;
i
<
sizeof
(
digest
);
i
++
) {
*
hmac_digest
++
=
hex
[
digest
[
i
] >>
4
];
*
hmac_digest
++
=
hex
[
digest
[
i
]
&
0xF
];
}
*
hmac_digest
=
'\0'
;
return
apr_pstrdup
(
msr
->
mp
,
hex_digest
);
}
/**
* \brief Init html response body parser
*
* \param msr ModSecurity transaction resource
*
* \retval 1 on success
* \retval -1 on fail
*/
int
init_response_body_html_parser
(
modsec_rec
*
msr
) {
char
*
charset
=
NULL
;
char
*
final_charset
=
NULL
;
char
sep
;
if
(
msr
==
NULL
)
return
-1
;
if
(
msr
->
r
==
NULL
)
return
-1
;
if
(
msr
->
r
->
content_type
==
NULL
)
return
-1
;
if
(
msr
->
crypto_html_tree
!=
NULL
){
xmlFreeDoc
(
msr
->
crypto_html_tree
);
msr
->
crypto_html_tree
=
NULL
;
}
if
((
strncmp
(
"text/html"
,
msr
->
r
->
content_type
,
9
)
!=
0
)){
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"init_response_body_html_parser: skipping html_tree generation for Content[%s]."
,
msr
->
r
->
content_type
);
if
(
msr
->
crypto_html_tree
!=
NULL
){
xmlFreeDoc
(
msr
->
crypto_html_tree
);
msr
->
crypto_html_tree
=
NULL
;
}
return
-1
;
}
if
(
msr
->
resbody_length
==
0
) {
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"init_response_body_html_parser: skipping html_tree generation for zero length respomse body."
);
msr
->
crypto_html_tree
=
NULL
;
return
0
;
}
if
((
msr
->
r
->
content_encoding
==
NULL
)
||
(
apr_strnatcasecmp
(
msr
->
r
->
content_encoding
,
"(null)"
)
==
0
)){
charset
=
m_strcasestr
(
msr
->
r
->
content_type
,
"charset="
);
if
(
charset
==
NULL
){
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"init_response_body_html_parser: assuming ISO-8859-1."
);
msr
->
crypto_html_tree
=
htmlReadMemory
(
msr
->
resbody_data
,
msr
->
resbody_length
,
NULL
,
"ISO-8859-1"
,
HTML_PARSE_RECOVER
|
HTML_PARSE_NOBLANKS
|
HTML_PARSE_NOERROR
|
HTML_PARSE_NOWARNING
);
htmlSetMetaEncoding
((
htmlDocPtr
)
msr
->
crypto_html_tree
, (
const
xmlChar
*
)
"ISO-8859-1"
);
}
else
{
charset
+=
8
;
final_charset
=
strchr
(
charset
,
' '
);
if
(
final_charset
==
NULL
)
final_charset
=
strchr
(
charset
,
';'
);
if
(
final_charset
!=
NULL
) {
sep
=
*
final_charset
;
*
final_charset
=
'\0'
;
}
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"init_response_body_html_parser: Charset[%s]"
,
charset
);
msr
->
crypto_html_tree
=
htmlReadMemory
(
msr
->
resbody_data
,
msr
->
resbody_length
,
NULL
,
charset
,
HTML_PARSE_RECOVER
|
HTML_PARSE_NOBLANKS
|
HTML_PARSE_NOERROR
|
HTML_PARSE_NOWARNING
);
htmlSetMetaEncoding
((
htmlDocPtr
)
msr
->
crypto_html_tree
, (
const
xmlChar
*
)
charset
);
if
(
final_charset
!=
NULL
)
*
final_charset
=
sep
;
}
}
else
{
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"init_response_body_html_parser: Enconding[%s]."
,
msr
->
r
->
content_encoding
);
msr
->
crypto_html_tree
=
htmlReadMemory
(
msr
->
resbody_data
,
msr
->
resbody_length
,
NULL
,
msr
->
r
->
content_encoding
,
HTML_PARSE_RECOVER
|
HTML_PARSE_NOBLANKS
|
HTML_PARSE_NOERROR
|
HTML_PARSE_NOWARNING
);
htmlSetMetaEncoding
((
htmlDocPtr
)
msr
->
crypto_html_tree
, (
const
xmlChar
*
)
msr
->
r
->
content_encoding
);
}
if
(
msr
->
crypto_html_tree
==
NULL
){
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"init_response_body_html_parser: Failed to parse response body."
);
return
-1
;
}
else
{
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"init_response_body_html_parser: Successfully html parser generated."
);
return
1
;
}
return
1
;
}
/**
* \brief Execute all hash methods
*
* \param msr ModSecurity transaction resource
* \param link The html attr value to be checked
* \param type The hash method type
*
* \retval 1 Match
* \retval 0 No Match
* \retval -1 on fail
*/
int
do_hash_method
(
modsec_rec
*
msr
,
char
*
link
,
int
type
) {
hash_method
*
*
em
=
NULL
;
int
i
=
0
;
char
*
error_msg
=
NULL
;
char
*
my_error_msg
=
NULL
;
int
ovector
[
33
];
int
rc
;
if
(
msr
==
NULL
)
return
-1
;
em
=
(
hash_method
*
*
)
msr
->
txcfg
->
hash_method
->
elts
;
if
(
msr
->
txcfg
->
hash_method
->
nelts
==
0
)
return
1
;
for
(
i
=
0
;
i
<
msr
->
txcfg
->
hash_method
->
nelts
;
i
++
) {
if
(
em
[
i
]
!=
NULL
&&
em
[
i
]
->
param_data
!=
NULL
){
switch
(
type
) {
case
HASH_URL_HREF_HASH_PM
:
if
(
em
[
i
]
->
type
==
HASH_URL_HREF_HASH_PM
) {
const
char
*
match
=
NULL
;
apr_status_t
rc
=
0
;
ACMPT
pt
;
pt
.
parser
=
(
ACMP
*
)
em
[
i
]
->
param_data
;
pt
.
ptr
=
NULL
;
rc
=
acmp_process_quick
(
&
pt
,
&
match
,
link
,
strlen
(
link
));
if
(
rc
) {
return
1
;
}
else
{
return
0
;
}
}
break
;
case
HASH_URL_HREF_HASH_RX
:
if
(
em
[
i
]
->
type
==
HASH_URL_HREF_HASH_RX
) {
rc
=
msc_regexec_capture
(
em
[
i
]
->
param_data
,
link
,
strlen
(
link
),
ovector
,
30
,
&
my_error_msg
);
if
((
rc
==
PCRE_ERROR_MATCHLIMIT
)
||
(
rc
==
PCRE_ERROR_RECURSIONLIMIT
)) {
msc_string
*
s
=
(
msc_string
*
)
apr_pcalloc
(
msr
->
mp
,
sizeof
(
msc_string
));
if
(
s
==
NULL
)
return
-1
;
s
->
name
=
apr_pstrdup
(
msr
->
mp
,
"MSC_PCRE_LIMITS_EXCEEDED"
);
if
(
s
->
name
==
NULL
)
return
-1
;
s
->
name_len
=
strlen
(
s
->
name
);
s
->
value
=
apr_pstrdup
(
msr
->
mp
,
"1"
);
if
(
s
->
value
==
NULL
)
return
-1
;
s
->
value_len
=
1
;
apr_table_setn
(
msr
->
tx_vars
,
s
->
name
, (
void
*
)
s
);
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Execution error - "
"PCRE limits exceeded for Hash regex [%s] (%d): %s"
,
em
[
i
]
->
param
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
0
;
/* No match. */
}
else
if
(
rc
<
-1
) {
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Regex execution failed (%d): %s"
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
-1
;
}
if
(
rc
!=
PCRE_ERROR_NOMATCH
) {
/* Match. */
return
1
;
}
}
break
;
case
HASH_URL_FACTION_HASH_PM
:
if
(
em
[
i
]
->
type
==
HASH_URL_FACTION_HASH_PM
) {
const
char
*
match
=
NULL
;
apr_status_t
rc
=
0
;
ACMPT
pt
;
pt
.
parser
=
(
ACMP
*
)
em
[
i
]
->
param_data
;
pt
.
ptr
=
NULL
;
rc
=
acmp_process_quick
(
&
pt
,
&
match
,
link
,
strlen
(
link
));
if
(
rc
) {
return
1
;
}
else
{
return
0
;
}
}
break
;
case
HASH_URL_FACTION_HASH_RX
:
if
(
em
[
i
]
->
type
==
HASH_URL_FACTION_HASH_RX
) {
rc
=
msc_regexec_capture
(
em
[
i
]
->
param_data
,
link
,
strlen
(
link
),
ovector
,
30
,
&
my_error_msg
);
if
((
rc
==
PCRE_ERROR_MATCHLIMIT
)
||
(
rc
==
PCRE_ERROR_RECURSIONLIMIT
)) {
msc_string
*
s
=
(
msc_string
*
)
apr_pcalloc
(
msr
->
mp
,
sizeof
(
msc_string
));
if
(
s
==
NULL
)
return
-1
;
s
->
name
=
apr_pstrdup
(
msr
->
mp
,
"MSC_PCRE_LIMITS_EXCEEDED"
);
if
(
s
->
name
==
NULL
)
return
-1
;
s
->
name_len
=
strlen
(
s
->
name
);
s
->
value
=
apr_pstrdup
(
msr
->
mp
,
"1"
);
if
(
s
->
value
==
NULL
)
return
-1
;
s
->
value_len
=
1
;
apr_table_setn
(
msr
->
tx_vars
,
s
->
name
, (
void
*
)
s
);
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Execution error - "
"PCRE limits exceeded for Hash regex [%s] (%d): %s"
,
em
[
i
]
->
param
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
0
;
/* No match. */
}
else
if
(
rc
<
-1
) {
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Regex execution failed (%d): %s"
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
-1
;
}
if
(
rc
!=
PCRE_ERROR_NOMATCH
) {
/* Match. */
return
1
;
}
}
break
;
case
HASH_URL_LOCATION_HASH_PM
:
if
(
em
[
i
]
->
type
==
HASH_URL_LOCATION_HASH_PM
) {
const
char
*
match
=
NULL
;
apr_status_t
rc
=
0
;
ACMPT
pt
;
pt
.
parser
=
(
ACMP
*
)
em
[
i
]
->
param_data
;
pt
.
ptr
=
NULL
;
rc
=
acmp_process_quick
(
&
pt
,
&
match
,
link
,
strlen
(
link
));
if
(
rc
) {
return
1
;
}
else
{
return
0
;
}
}
break
;
case
HASH_URL_LOCATION_HASH_RX
:
if
(
em
[
i
]
->
type
==
HASH_URL_LOCATION_HASH_RX
) {
rc
=
msc_regexec_capture
(
em
[
i
]
->
param_data
,
link
,
strlen
(
link
),
ovector
,
30
,
&
my_error_msg
);
if
((
rc
==
PCRE_ERROR_MATCHLIMIT
)
||
(
rc
==
PCRE_ERROR_RECURSIONLIMIT
)) {
msc_string
*
s
=
(
msc_string
*
)
apr_pcalloc
(
msr
->
mp
,
sizeof
(
msc_string
));
if
(
s
==
NULL
)
return
-1
;
s
->
name
=
apr_pstrdup
(
msr
->
mp
,
"MSC_PCRE_LIMITS_EXCEEDED"
);
if
(
s
->
name
==
NULL
)
return
-1
;
s
->
name_len
=
strlen
(
s
->
name
);
s
->
value
=
apr_pstrdup
(
msr
->
mp
,
"1"
);
if
(
s
->
value
==
NULL
)
return
-1
;
s
->
value_len
=
1
;
apr_table_setn
(
msr
->
tx_vars
,
s
->
name
, (
void
*
)
s
);
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Execution error - "
"PCRE limits exceeded for Hash regex [%s] (%d): %s"
,
em
[
i
]
->
param
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
0
;
/* No match. */
}
else
if
(
rc
<
-1
) {
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Regex execution failed (%d): %s"
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
-1
;
}
if
(
rc
!=
PCRE_ERROR_NOMATCH
) {
/* Match. */
return
1
;
}
}
break
;
case
HASH_URL_IFRAMESRC_HASH_PM
:
if
(
em
[
i
]
->
type
==
HASH_URL_IFRAMESRC_HASH_PM
) {
const
char
*
match
=
NULL
;
apr_status_t
rc
=
0
;
ACMPT
pt
;
pt
.
parser
=
(
ACMP
*
)
em
[
i
]
->
param_data
;
pt
.
ptr
=
NULL
;
rc
=
acmp_process_quick
(
&
pt
,
&
match
,
link
,
strlen
(
link
));
if
(
rc
) {
return
1
;
}
else
{
return
0
;
}
}
break
;
case
HASH_URL_IFRAMESRC_HASH_RX
:
if
(
em
[
i
]
->
type
==
HASH_URL_IFRAMESRC_HASH_RX
) {
rc
=
msc_regexec_capture
(
em
[
i
]
->
param_data
,
link
,
strlen
(
link
),
ovector
,
30
,
&
my_error_msg
);
if
((
rc
==
PCRE_ERROR_MATCHLIMIT
)
||
(
rc
==
PCRE_ERROR_RECURSIONLIMIT
)) {
msc_string
*
s
=
(
msc_string
*
)
apr_pcalloc
(
msr
->
mp
,
sizeof
(
msc_string
));
if
(
s
==
NULL
)
return
-1
;
s
->
name
=
apr_pstrdup
(
msr
->
mp
,
"MSC_PCRE_LIMITS_EXCEEDED"
);
if
(
s
->
name
==
NULL
)
return
-1
;
s
->
name_len
=
strlen
(
s
->
name
);
s
->
value
=
apr_pstrdup
(
msr
->
mp
,
"1"
);
if
(
s
->
value
==
NULL
)
return
-1
;
s
->
value_len
=
1
;
apr_table_setn
(
msr
->
tx_vars
,
s
->
name
, (
void
*
)
s
);
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Execution error - "
"PCRE limits exceeded for Hash regex [%s] (%d): %s"
,
em
[
i
]
->
param
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
0
;
/* No match. */
}
else
if
(
rc
<
-1
) {
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Regex execution failed (%d): %s"
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
-1
;
}
if
(
rc
!=
PCRE_ERROR_NOMATCH
) {
/* Match. */
return
1
;
}
}
break
;
case
HASH_URL_FRAMESRC_HASH_PM
:
if
(
em
[
i
]
->
type
==
HASH_URL_FRAMESRC_HASH_PM
) {
const
char
*
match
=
NULL
;
apr_status_t
rc
=
0
;
ACMPT
pt
;
pt
.
parser
=
(
ACMP
*
)
em
[
i
]
->
param_data
;
pt
.
ptr
=
NULL
;
rc
=
acmp_process_quick
(
&
pt
,
&
match
,
link
,
strlen
(
link
));
if
(
rc
) {
return
1
;
}
else
{
return
0
;
}
}
break
;
case
HASH_URL_FRAMESRC_HASH_RX
:
if
(
em
[
i
]
->
type
==
HASH_URL_FRAMESRC_HASH_RX
) {
rc
=
msc_regexec_capture
(
em
[
i
]
->
param_data
,
link
,
strlen
(
link
),
ovector
,
30
,
&
my_error_msg
);
if
((
rc
==
PCRE_ERROR_MATCHLIMIT
)
||
(
rc
==
PCRE_ERROR_RECURSIONLIMIT
)) {
msc_string
*
s
=
(
msc_string
*
)
apr_pcalloc
(
msr
->
mp
,
sizeof
(
msc_string
));
if
(
s
==
NULL
)
return
-1
;
s
->
name
=
apr_pstrdup
(
msr
->
mp
,
"MSC_PCRE_LIMITS_EXCEEDED"
);
if
(
s
->
name
==
NULL
)
return
-1
;
s
->
name_len
=
strlen
(
s
->
name
);
s
->
value
=
apr_pstrdup
(
msr
->
mp
,
"1"
);
if
(
s
->
value
==
NULL
)
return
-1
;
s
->
value_len
=
1
;
apr_table_setn
(
msr
->
tx_vars
,
s
->
name
, (
void
*
)
s
);
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Execution error - "
"PCRE limits exceeded for Hash regex [%s] (%d): %s"
,
em
[
i
]
->
param
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
0
;
/* No match. */
}
else
if
(
rc
<
-1
) {
error_msg
=
apr_psprintf
(
msr
->
mp
,
"Regex execution failed (%d): %s"
,
rc
,
my_error_msg
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"%s."
,
error_msg
);
return
-1
;
}
if
(
rc
!=
PCRE_ERROR_NOMATCH
) {
/* Match. */
return
1
;
}
}
break
;
}
}
}
return
0
;
}
/**
* \brief Hash the html elements
*
* \param msr ModSecurity transaction resource
*
* \retval 1 On success
* \retval 0 No element was changed
* \retval -1 On fail
*/
int
hash_response_body_links
(
modsec_rec
*
msr
) {
int
lsize
=
0
,
fsize
=
0
,
lcount
=
0
,
fcount
=
0
,
i
;
int
isize
=
0
,
icount
=
0
,
frsize
=
0
,
frcount
=
0
;
int
bytes
=
0
;
xmlXPathContextPtr
xpathCtx
=
NULL
;
xmlXPathObjectPtr
xpathObj
=
NULL
;
xmlChar
*
content_option
=
NULL
;
char
*
mac_link
=
NULL
;
int
rc
,
elts
=
0
;
if
(
msr
==
NULL
)
return
-1
;
if
(
msr
->
crypto_html_tree
==
NULL
) {
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"hash_response_body_links: Cannot parse NULL html tree"
);
return
-1
;
}
if
(
msr
->
txcfg
->
crypto_hash_href_rx
==
0
&&
msr
->
txcfg
->
crypto_hash_href_pm
==
0
&&
msr
->
txcfg
->
crypto_hash_faction_rx
==
0
&&
msr
->
txcfg
->
crypto_hash_faction_pm
==
0
&&
msr
->
txcfg
->
crypto_hash_iframesrc_rx
==
0
&&
msr
->
txcfg
->
crypto_hash_iframesrc_pm
==
0
&&
msr
->
txcfg
->
crypto_hash_framesrc_rx
==
0
&&
msr
->
txcfg
->
crypto_hash_framesrc_pm
==
0
)
return
-1
;
xpathCtx
=
xmlXPathNewContext
(
msr
->
crypto_html_tree
);
if
(
xpathCtx
==
NULL
) {
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"hash_response_body_links: Unable to create Xpath context."
);
goto
ctx_error
;
}
lcount
=
fcount
=
0
;
if
(
msr
->
txcfg
->
crypto_hash_href_rx
==
1
||
msr
->
txcfg
->
crypto_hash_href_pm
==
1
) {
xpathObj
=
xmlXPathEvalExpression
((
xmlChar
*
)
"//*[@href]"
,
xpathCtx
);
if
(
xpathObj
==
NULL
) {
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"hash_response_body_links: Unable to evaluate xpath expression."
);
goto
obj_error
;
}
lsize
=
(
xpathObj
->
nodesetval
) ?
xpathObj
->
nodesetval
->
nodeNr
:
0
;
for
(
i
=
lsize
-
1
;
i
>=
0
;
i
--
) {
register
xmlNodePtr
cur
;
cur
=
xpathObj
->
nodesetval
->
nodeTab
[
i
];
if
(
cur
!=
NULL
){
xmlChar
*
href
=
xmlGetProp
(
cur
, (
const
xmlChar
*
)
"href"
);
char
*
content_href
=
normalize_path
(
msr
, (
char
*
)
href
);
if
(
content_href
!=
NULL
&&
strstr
(
content_href
,
msr
->
txcfg
->
crypto_param_name
)
==
NULL
) {
if
(
msr
->
txcfg
->
crypto_hash_href_rx
==
1
) {
rc
=
do_hash_method
(
msr
, (
char
*
)
content_href
,
HASH_URL_HREF_HASH_RX
);
if
(
rc
>
0
) {
mac_link
=
NULL
;
mac_link
=
do_hash_link
(
msr
, (
char
*
)
content_href
,
FULL_LINK
);
if
(
mac_link
!=
NULL
) {
xmlSetProp
(
cur
, (
const
xmlChar
*
)
"href"
, (
const
xmlChar
*
)
mac_link
);
lcount
++
;
bytes
+=
strlen
(
mac_link
);
msr
->
of_stream_changed
=
1
;
}
mac_link
=
NULL
;
if
(
href
!=
NULL
)
xmlFree
(
href
);
continue
;
}
}
if
(
msr
->
txcfg
->
crypto_hash_href_pm
==
1
) {
rc
=
do_hash_method
(
msr
, (
char
*
)
content_href
,
HASH_URL_HREF_HASH_PM
);
if
(
rc
>
0
) {
mac_link
=
NULL
;
mac_link
=
do_hash_link
(
msr
, (
char
*
)
content_href
,
FULL_LINK
);
if
(
mac_link
!=
NULL
) {
xmlSetProp
(
cur
, (
const
xmlChar
*
)
"href"
, (
const
xmlChar
*
)
mac_link
);
lcount
++
;
bytes
+=
strlen
(
mac_link
);
msr
->
of_stream_changed
=
1
;
}
mac_link
=
NULL
;
if
(
href
!=
NULL
)
xmlFree
(
href
);
continue
;
}
}
}
if
(
href
!=
NULL
) {
xmlFree
(
href
);
href
=
NULL
;
}
}
}
if
(
xpathObj
!=
NULL
)
xmlXPathFreeObject
(
xpathObj
);
}
if
(
msr
->
txcfg
->
crypto_hash_faction_rx
==
1
||
msr
->
txcfg
->
crypto_hash_faction_pm
==
1
) {
xpathObj
=
xmlXPathEvalExpression
((
xmlChar
*
)
"//form"
,
xpathCtx
);
if
(
xpathObj
==
NULL
) {
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"hash_response_body_links: Unable to evaluate xpath expression."
);
goto
obj_error
;
}
fsize
=
(
xpathObj
->
nodesetval
) ?
xpathObj
->
nodesetval
->
nodeNr
:
0
;
for
(
i
=
fsize
-
1
;
i
>=
0
;
i
--
) {
register
xmlNodePtr
cur
;
cur
=
xpathObj
->
nodesetval
->
nodeTab
[
i
];
if
((
cur
!=
NULL
)){
xmlChar
*
action
=
NULL
;
char
*
content_action
=
NULL
;
if
(
content_option
)
xmlFree
(
content_option
);
action
=
xmlGetProp
(
cur
, (
const
xmlChar
*
)
"action"
);
content_action
=
normalize_path
(
msr
, (
char
*
)
action
);
content_option
=
xmlGetProp
(
cur
, (
const
xmlChar
*
)
"option"
);
if
(
content_action
!=
NULL
&&
content_option
==
NULL
&&
strstr
(
content_action
,
msr
->
txcfg
->
crypto_param_name
)
==
NULL
) {
if
(
msr
->
txcfg
->
crypto_hash_faction_rx
==
1
) {
rc
=
do_hash_method
(
msr
, (
char
*
)
content_action
,
HASH_URL_FACTION_HASH_RX
);
if
(
rc
>
0
) {
mac_link
=
NULL
;
mac_link
=
do_hash_link
(
msr
, (
char
*
)
content_action
,
FULL_LINK
);
if
(
mac_link
!=
NULL
) {
xmlSetProp
(
cur
, (
const
xmlChar
*
)
"action"
, (
const
xmlChar
*
)
mac_link
);
fcount
++
;
bytes
+=
strlen
(
mac_link
);
msr
->
of_stream_changed
=
1
;
}
mac_link
=
NULL
;
if
(
action
!=
NULL
)
xmlFree
(
action
);
continue
;
}
}
if
(
msr
->
txcfg
->
crypto_hash_faction_pm
==
1
) {
rc
=
do_hash_method
(
msr
, (
char
*
)
content_action
,
HASH_URL_FACTION_HASH_PM
);
if
(
rc
>
0
) {
mac_link
=
NULL
;
mac_link
=
do_hash_link
(
msr
, (
char
*
)
content_action
,
FULL_LINK
);
if
(
mac_link
!=
NULL
) {
xmlSetProp
(
cur
, (
const
xmlChar
*
)
"action"
, (
const
xmlChar
*
)
mac_link
);
fcount
++
;
bytes
+=
strlen
(
mac_link
);
msr
->
of_stream_changed
=
1
;
}
mac_link
=
NULL
;
if
(
action
!=
NULL
)
xmlFree
(
action
);
continue
;
}
}
}
if
(
action
!=
NULL
) {
xmlFree
(
action
);
action
=
NULL
;
}
if
(
content_option
) {
xmlFree
(
content_option
);
content_option
=
NULL
;
}
}
}
if
(
xpathObj
!=
NULL
)
xmlXPathFreeObject
(
xpathObj
);
}
if
(
msr
->
txcfg
->
crypto_hash_iframesrc_rx
==
1
||
msr
->
txcfg
->
crypto_hash_iframesrc_pm
==
1
) {
xpathObj
=
xmlXPathEvalExpression
((
xmlChar
*
)
"//iframe"
,
xpathCtx
);
if
(
xpathObj
==
NULL
) {
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"hash_response_body_links: Unable to evaluate xpath expression."
);
goto
obj_error
;
}
isize
=
(
xpathObj
->
nodesetval
) ?
xpathObj
->
nodesetval
->
nodeNr
:
0
;
for
(
i
=
isize
-
1
;
i
>=
0
;
i
--
) {
register
xmlNodePtr
cur
;
cur
=
xpathObj
->
nodesetval
->
nodeTab
[
i
];
if
((
cur
!=
NULL
)){
xmlChar
*
src
=
xmlGetProp
(
cur
, (
const
xmlChar
*
)
"src"
);
char
*
content_src
=
normalize_path
(
msr
, (
char
*
)
src
);
if
(
content_src
!=
NULL
&&
strstr
(
content_src
,
msr
->
txcfg
->
crypto_param_name
)
==
NULL
) {
if
(
msr
->
txcfg
->
crypto_hash_iframesrc_rx
==
1
) {
rc
=
do_hash_method
(
msr
, (
char
*
)
content_src
,
HASH_URL_IFRAMESRC_HASH_RX
);
if
(
rc
>
0
) {
mac_link
=
NULL
;
mac_link
=
do_hash_link
(
msr
, (
char
*
)
content_src
,
FULL_LINK
);
if
(
mac_link
!=
NULL
) {
xmlSetProp
(
cur
, (
const
xmlChar
*
)
"src"
, (
const
xmlChar
*
)
mac_link
);
icount
++
;
bytes
+=
strlen
(
mac_link
);
msr
->
of_stream_changed
=
1
;
}
mac_link
=
NULL
;
if
(
src
!=
NULL
)
xmlFree
(
src
);
continue
;
}
}
if
(
msr
->
txcfg
->
crypto_hash_iframesrc_pm
==
1
) {
rc
=
do_hash_method
(
msr
, (
char
*
)
content_src
,
HASH_URL_IFRAMESRC_HASH_PM
);
if
(
rc
>
0
) {
mac_link
=
NULL
;
mac_link
=
do_hash_link
(
msr
, (
char
*
)
content_src
,
FULL_LINK
);
if
(
mac_link
!=
NULL
) {
xmlSetProp
(
cur
, (
const
xmlChar
*
)
"src"
, (
const
xmlChar
*
)
mac_link
);
icount
++
;
bytes
+=
strlen
(
mac_link
);
msr
->
of_stream_changed
=
1
;
}
mac_link
=
NULL
;
if
(
src
!=
NULL
)
xmlFree
(
src
);
continue
;
}
}
}
if
(
src
!=
NULL
) {
xmlFree
(
src
);
src
=
NULL
;
}
}
}
if
(
xpathObj
!=
NULL
)
xmlXPathFreeObject
(
xpathObj
);
}
if
(
msr
->
txcfg
->
crypto_hash_framesrc_rx
==
1
||
msr
->
txcfg
->
crypto_hash_framesrc_pm
==
1
) {
xpathObj
=
xmlXPathEvalExpression
((
xmlChar
*
)
"//frame"
,
xpathCtx
);
if
(
xpathObj
==
NULL
) {
if
(
msr
->
txcfg
->
debuglog_level
>=
4
)
msr_log
(
msr
,
4
,
"hash_response_body_links: Unable to evaluate xpath expression."
);
goto
obj_error
;
}
frsize
=
(
xpathObj
->
nodesetval
) ?
xpathObj
->
nodesetval
->
nodeNr
:
0
;
for
(
i
=
frsize
-
1
;
i
>=
0
;
i
--
) {
register
xmlNodePtr
cur
;
cur
=
xpathObj
->
nodesetval
->
nodeTab
[
i
];
if
((
cur
!=
NULL
)){
xmlChar
*
src
=
xmlGetProp
(
cur
, (
const
xmlChar
*
)
"src"
);
char
*
content_src
=
normalize_path
(
msr
, (
char
*
)
src
);
if
(
content_src
!=
NULL
&&
strstr
(
content_src
,
msr
->
txcfg
->
crypto_param_name
)
==
NULL
) {
if
(
msr
->
txcfg
->
crypto_hash_framesrc_rx
==
1
) {
rc
=
do_hash_method
(
msr
, (
char
*
)
content_src
,
HASH_URL_FRAMESRC_HASH_RX
);
if
(
rc
>
0
) {
mac_link
=
NULL
;
mac_link
=
do_hash_link
(
msr
, (
char
*
)
content_src
,
FULL_LINK
);
if
(
mac_link
!=
NULL
) {
xmlSetProp
(
cur
, (
const
xmlChar
*
)
"src"
, (
const
xmlChar
*
)
mac_link
);
frcount
++
;
bytes
+=
strlen
(
mac_link
);
msr
->
of_stream_changed
=
1
;
}
mac_link
=
NULL
;
if
(
src
!=
NULL
)
xmlFree
(
src
);
continue
;
}
}
if
(
msr
->
txcfg
->
crypto_hash_framesrc_pm
==
1
) {
rc
=
do_hash_method
(
msr
, (
char
*
)
content_src
,
HASH_URL_FRAMESRC_HASH_PM
);
if
(
rc
>
0
) {
mac_link
=
NULL
;
mac_link
=
do_hash_link
(
msr
, (
char
*
)
content_src
,
FULL_LINK
);
if
(
mac_link
!=
NULL
) {
xmlSetProp
(
cur
, (
const
xmlChar
*
)
"src"
, (
const
xmlChar
*
)
mac_link
);
frcount
++
;
bytes
+=
strlen
(
mac_link
);
msr
->
of_stream_changed
=
1
;
}
mac_link
=
NULL
;
if
(
src
!=
NULL
)
xmlFree
(
src
);
continue
;
}
}
}
if
(
src
!=
NULL
) {
xmlFree
(
src
);
src
=
NULL
;
}
}
}
if
(
xpathObj
!=
NULL
)
xmlXPathFreeObject
(
xpathObj
);
}
if
(
xpathCtx
!=
NULL
)
xmlXPathFreeContext
(
xpathCtx
);
if
(
msr
->
txcfg
->
debuglog_level
>=
4
) {
msr_log
(
msr
,
4
,
"hash_response_body_links: Processed [%d] iframe src, [%d] hashed."
,
isize
,
icount
);
msr_log
(
msr
,
4
,
"hash_response_body_links: Processed [%d] frame src, [%d] hashed."
,
frsize
,
frcount
);
msr_log
(
msr
,
4
,
"hash_response_body_links: Processed [%d] form actions, [%d] hashed."
,
fsize
,
fcount
);
msr_log
(
msr
,
4
,
"hash_response_body_links: Processed [%d] links, [%d] hashed."
,
lsize
,
lcount
);
}
if
(
msr
->
of_stream_changed
==
0
) {
if
(
msr
->
crypto_html_tree
!=
NULL
) {
xmlFreeDoc
(
msr
->
crypto_html_tree
);
msr
->
crypto_html_tree
=
NULL
;
}
return
0
;
}
elts
=
(
icount
+
frcount
+
fcount
+
lcount
);
if
((
elts
>=
INT32_MAX
)
||
(
elts
<
0
))
return
0
;
return
bytes
;
obj_error
:
if
(
xpathCtx
!=
NULL
)
xmlXPathFreeContext
(
xpathCtx
);
ctx_error
:
return
-1
;
}
/**
* \brief Inject the new response body
*
* \param msr ModSecurity transaction resource
* \param elts Number of hashed elements
*
* \retval 1 On success
* \retval -1 On fail
View remainder of file in raw view
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