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MEDIUM: h1: Add an option to sanitize connection headers during parsing

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The flag H1_MF_CLEAN_CONN_HDR has been added to let the H1 parser sanitize
connection headers. It means it will remove all "close" and "keep-alive" values
during the parsing. One noticeable effect is that connection headers may be
unfolded. In practice, this is not a problem because it is not frequent to have
multiple values for the connection headers.

If this flag is set, during the parsing The function
h1_parse_next_connection_header() is called in a loop instead of
h1_parse_conection_header().

No need to backport this patch
This commit is contained in:
Christopher Faulet 2019-03-29 15:03:13 +01:00
parent b829f4c726
commit a51ebb7f56
2 changed files with 39 additions and 10 deletions
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3
include/common/h1.h
View File

@ -93,6 +93,7 @@ enum h1m_state {
#define H1_MF_XFER_ENC 0x00000200 // transfer-encoding is present
#define H1_MF_NO_PHDR 0x00000400 // don't add pseudo-headers in the header list
#define H1_MF_HDRS_ONLY 0x00000800 // parse headers only
#define H1_MF_CLEAN_CONN_HDR 0x00001000 // skip close/keep-alive values of connection headers during parsing
/* Note: for a connection to be persistent, we need this for the request :
* - one of CLEN or CHNK
@ -144,7 +145,7 @@ int h1_measure_trailers(const struct buffer *buf, unsigned int ofs, unsigned int
int h1_parse_cont_len_header(struct h1m *h1m, struct ist *value);
void h1_parse_xfer_enc_header(struct h1m *h1m, struct ist value);
void h1_parse_connection_header(struct h1m *h1m, struct ist value);
void h1_parse_connection_header(struct h1m *h1m, struct ist *value);
/* for debugging, reports the HTTP/1 message state name */
static inline const char *h1m_state_str(enum h1m_state msg_state)

46
src/h1.c
View File

@ -132,15 +132,20 @@ void h1_parse_xfer_enc_header(struct h1m *h1m, struct ist value)
* "keep-alive", and "upgrade" values, and updating h1m->flags according to
* what was found there. Note that flags are only added, not removed, so the
* function is safe for being called multiple times if multiple occurrences
* are found.
* are found. If the flag H1_MF_CLEAN_CONN_HDR, the header value is cleaned
* up from "keep-alive" and "close" values. To do so, the header value is
* rewritten in place and its length is updated.
*/
void h1_parse_connection_header(struct h1m *h1m, struct ist value)
void h1_parse_connection_header(struct h1m *h1m, struct ist *value)
{
char *e, *n;
char *e, *n, *p;
struct ist word;
word.ptr = value.ptr - 1; // -1 for next loop's pre-increment
e = value.ptr + value.len;
word.ptr = value->ptr - 1; // -1 for next loop's pre-increment
p = value->ptr;
e = value->ptr + value->len;
if (h1m->flags & H1_MF_CLEAN_CONN_HDR)
value->len = 0;
while (++word.ptr < e) {
/* skip leading delimitor and blanks */
@ -154,14 +159,33 @@ void h1_parse_connection_header(struct h1m *h1m, struct ist value)
while (word.len && HTTP_IS_LWS(word.ptr[word.len-1]))
word.len--;
if (isteqi(word, ist("keep-alive")))
if (isteqi(word, ist("keep-alive"))) {
h1m->flags |= H1_MF_CONN_KAL;
else if (isteqi(word, ist("close")))
if (h1m->flags & H1_MF_CLEAN_CONN_HDR)
goto skip_val;
}
else if (isteqi(word, ist("close"))) {
h1m->flags |= H1_MF_CONN_CLO;
if (h1m->flags & H1_MF_CLEAN_CONN_HDR)
goto skip_val;
}
else if (isteqi(word, ist("upgrade")))
h1m->flags |= H1_MF_CONN_UPG;
word.ptr = n;
if (h1m->flags & H1_MF_CLEAN_CONN_HDR) {
if (value->ptr + value->len == p) {
/* no rewrite done till now */
value->len = n - value->ptr;
}
else {
if (value->len)
value->ptr[value->len++] = ',';
istcat(value, word, e - value->ptr);
}
}
skip_val:
word.ptr = p = n;
}
}
@ -802,7 +826,11 @@ int h1_headers_to_hdr_list(char *start, const char *stop,
}
}
else if (isteqi(n, ist("connection"))) {
h1_parse_connection_header(h1m, v);
h1_parse_connection_header(h1m, &v);
if (!v.len) {
/* skip it */
break;
}
}
http_set_hdr(&hdr[hdr_count++], n, v);