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[core] http_request_parse() mark error paths cold

This commit is contained in:
Glenn Strauss 2019-02-09 14:30:00 -05:00
parent e0a35b75c0
commit e5d61e9a5f
3 changed files with 83 additions and 198 deletions
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5
src/connections.c
View File

@ -728,6 +728,8 @@ static void connection_read_header(server *srv, connection *con) {
if (NULL == c) return; /* incomplete request headers */
con->header_len = hlen;
buffer_clear(con->request.request);
for (c = cq->first; c; c = c->next) {
@ -781,7 +783,8 @@ static void connection_read_header(server *srv, connection *con) {
save = buffer_init_buffer(con->request.request);
}
if (0 != http_request_parse(srv, con, con->request.request)) {
con->http_status = http_request_parse(srv, con, con->request.request);
if (0 != con->http_status) {
con->keep_alive = 0;
con->request.content_length = 0;

269
src/request.c
View File

@ -397,18 +397,31 @@ static int http_request_split_value(array *vals, const char *current, size_t len
}
static int request_uri_is_valid_char(unsigned char c) {
if (c <= 32) return 0;
if (c == 127) return 0;
if (c == 255) return 0;
return 1;
return (c > 32 && c != 127 && c != 255);
}
static void http_request_missing_CR_before_LF(server *srv, connection *con) {
UNUSED(con);
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "missing CR before LF in header -> 400");
}
__attribute_cold__
__attribute_noinline__
static int http_request_header_line_invalid(server *srv, int status, const char *msg) {
if (srv->srvconf.log_request_header_on_error) {
if (msg) log_error_write(srv, __FILE__, __LINE__, "s", msg);
}
return status;
}
__attribute_cold__
__attribute_noinline__
static int http_request_header_char_invalid(server *srv, char ch, const char *msg) {
if (srv->srvconf.log_request_header_on_error) {
if ((unsigned char)ch > 32 && ch != 127) {
char buf[2] = { ch, '\0' };
log_error_write(srv,__FILE__,__LINE__,"sSSS",msg,"('",buf,"')");
}
else {
log_error_write(srv,__FILE__,__LINE__,"sSXS",msg,"(",ch,")");
}
}
return 400;
}
enum keep_alive_set {
@ -422,6 +435,7 @@ typedef struct {
char con_length_set;
char *reqline_host;
int reqline_hostlen;
size_t reqline_len;
} parse_header_state;
static void init_parse_header_state(parse_header_state* state) {
@ -429,13 +443,14 @@ static void init_parse_header_state(parse_header_state* state) {
state->con_length_set = 0;
state->reqline_host = NULL;
state->reqline_hostlen = 0;
state->reqline_len = 0;
}
/* add header to list of headers
* certain headers are also parsed
* might drop a header if deemed unnecessary/broken
*
* returns 0 on error
* returns 0 on success, HTTP status on error
*/
static int parse_single_header(server *srv, connection *con, parse_header_state *state, char *k, size_t klen, char *v, size_t vlen) {
const enum http_header_e id = http_header_hkey_get(k, klen);
@ -448,7 +463,7 @@ static int parse_single_header(server *srv, connection *con, parse_header_state
while (vlen > 0 && (v[vlen - 1] == ' ' || v[vlen - 1] == '\t')) --vlen;
/* empty header-fields are not allowed by HTTP-RFC, we just ignore them */
if (0 == vlen) return 1; /* ignore header */
if (0 == vlen) return 0; /* ignore header */
/*
* Note: k might not be '\0'-terminated
@ -462,22 +477,15 @@ static int parse_single_header(server *srv, connection *con, parse_header_state
if (!(con->request.htags & HTTP_HEADER_HOST)) {
saveb = &con->request.http_host;
if (vlen >= 1024) { /*(expecting < 256)*/
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "uri-authority too long -> 400");
}
return 0; /* invalid header */
return http_request_header_line_invalid(srv, 400, "uri-authority too long -> 400");
}
}
else if (state->reqline_host) {
/* ignore all Host: headers as we got Host in request line */
return 1; /* ignore header */
return 0; /* ignore header */
}
else {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s",
"duplicate Host-header -> 400");
}
return 0; /* invalid header */
return http_request_header_line_invalid(srv, 400, "duplicate Host header -> 400");
}
break;
case HTTP_HEADER_CONNECTION:
@ -502,17 +510,13 @@ static int parse_single_header(server *srv, connection *con, parse_header_state
break;
case HTTP_HEADER_CONTENT_TYPE:
if (con->request.htags & HTTP_HEADER_CONTENT_TYPE) {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s",
"duplicate Content-Type-header -> 400");
}
return 0; /* invalid header */
return http_request_header_line_invalid(srv, 400, "duplicate Content-Type header -> 400");
}
break;
case HTTP_HEADER_IF_NONE_MATCH:
/* if dup, only the first one will survive */
if (con->request.htags & HTTP_HEADER_IF_NONE_MATCH) {
return 1; /* ignore header */
return 0; /* ignore header */
}
break;
case HTTP_HEADER_CONTENT_LENGTH:
@ -524,17 +528,11 @@ static int parse_single_header(server *srv, connection *con, parse_header_state
con->request.content_length = r;
}
else {
log_error_write(srv, __FILE__, __LINE__, "sss",
"content-length broken:", v, "-> 400");
return 0; /* invalid header */
return http_request_header_line_invalid(srv, 400, "invalid Content-Length header -> 400");
}
}
else {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s",
"duplicate Content-Length-header -> 400");
}
return 0; /* invalid header */
return http_request_header_line_invalid(srv, 400, "duplicate Content-Length header -> 400");
}
break;
case HTTP_HEADER_IF_MODIFIED_SINCE:
@ -547,14 +545,10 @@ static int parse_single_header(server *srv, connection *con, parse_header_state
CONST_STR_LEN("If-Modified-Since"));
if (vb && buffer_is_equal_caseless_string(vb, v, vlen)) {
/* ignore it if they are the same */
return 1; /* ignore header */
return 0; /* ignore header */
}
else {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s",
"duplicate If-Modified-Since header -> 400");
}
return 0; /* invalid header */
return http_request_header_line_invalid(srv, 400, "duplicate If-Modified-Since header -> 400");
}
}
break;
@ -567,7 +561,7 @@ static int parse_single_header(server *srv, connection *con, parse_header_state
*saveb = http_header_request_get(con, id, k, klen);
}
return 1;
return 0;
}
static size_t http_request_parse_reqline(server *srv, connection *con, buffer *hdrs, parse_header_state *state) {
@ -610,16 +604,12 @@ static size_t http_request_parse_reqline(server *srv, connection *con, buffer *h
ptr[i] = '\0';
++i;
} else if (http_header_strict) { /* '\n' */
http_request_missing_CR_before_LF(srv, con);
return 0;
return http_request_header_line_invalid(srv, 400, "missing CR before LF in header -> 400");
}
ptr[i] = '\0';
if (request_line_stage != 2) {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "incomplete request line -> 400");
}
return 0;
return http_request_header_line_invalid(srv, 400, "incomplete request line -> 400");
}
proto = ptr + first;
@ -629,13 +619,7 @@ static size_t http_request_parse_reqline(server *srv, connection *con, buffer *h
/* we got the first one :) */
if (HTTP_METHOD_UNSET == (r = get_http_method_key(method))) {
con->http_status = 501;
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "unknown http-method -> 501");
}
return 0;
return http_request_header_line_invalid(srv, 501, "unknown http-method -> 501");
}
con->request.http_method = r;
@ -671,10 +655,7 @@ static size_t http_request_parse_reqline(server *srv, connection *con, buffer *h
}
if (invalid_version) {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "unknown protocol -> 400");
}
return 0;
return http_request_header_line_invalid(srv, 400, "unknown protocol -> 400");
}
if (major_num == 1 && minor_num == 1) {
@ -682,18 +663,10 @@ static size_t http_request_parse_reqline(server *srv, connection *con, buffer *h
} else if (major_num == 1 && minor_num == 0) {
con->request.http_version = HTTP_VERSION_1_0;
} else {
con->http_status = 505;
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "unknown HTTP version -> 505");
}
return 0;
return http_request_header_line_invalid(srv, 505, "unknown HTTP version -> 505");
}
} else {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "unknown protocol -> 400");
}
return 0;
return http_request_header_line_invalid(srv, 400, "unknown protocol -> 400");
}
if (*uri == '/') {
@ -717,8 +690,7 @@ static size_t http_request_parse_reqline(server *srv, connection *con, buffer *h
/* everything looks good so far */
buffer_copy_string_len(con->request.uri, uri, proto - uri - 1);
} else {
log_error_write(srv, __FILE__, __LINE__, "ss", "request-URI parse error -> 400 for:", uri);
return 0;
return http_request_header_line_invalid(srv, 400, "request-URI parse error -> 400");
}
/* check uri for invalid characters */
@ -732,26 +704,7 @@ static size_t http_request_parse_reqline(server *srv, connection *con, buffer *h
j = (NULL == z) ? jlen : (size_t)(z - con->request.uri->ptr);
}
if (j < jlen) {
if (srv->srvconf.log_request_header_on_error) {
unsigned char buf[2];
buf[0] = con->request.uri->ptr[j];
buf[1] = '\0';
if (con->request.uri->ptr[j] > 32 &&
con->request.uri->ptr[j] != 127) {
/* the character is printable -> print it */
log_error_write(srv, __FILE__, __LINE__, "ss",
"invalid character in URI -> 400",
buf);
} else {
/* a control-character, print ascii-code */
log_error_write(srv, __FILE__, __LINE__, "sd",
"invalid character in URI -> 400",
con->request.uri->ptr[j]);
}
}
return 0;
return http_request_header_char_invalid(srv, con->request.uri->ptr[j], "invalid character in URI -> 400");
}
buffer_copy_buffer(con->request.orig_uri, con->request.uri);
@ -776,10 +729,7 @@ static size_t http_request_parse_reqline(server *srv, connection *con, buffer *h
break;
default:
/* ERROR, one space to much */
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "overlong request line -> 400");
}
return 0;
return http_request_header_line_invalid(srv, 400, "overlong request line -> 400");
}
request_line_stage++;
@ -788,25 +738,20 @@ static size_t http_request_parse_reqline(server *srv, connection *con, buffer *h
}
if (buffer_string_is_empty(con->request.uri)) {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "no uri specified -> 400");
}
return 0;
return http_request_header_line_invalid(srv, 400, "no uri specified -> 400");
}
if (state->reqline_host) {
/* Insert as host header */
if (state->reqline_hostlen >= 1024) { /*(expecting < 256)*/
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "uri-authority too long -> 400");
}
return 0;
return http_request_header_line_invalid(srv, 400, "uri-authority too long -> 400");
}
http_header_request_set(con, HTTP_HEADER_HOST, CONST_STR_LEN("Host"), state->reqline_host, state->reqline_hostlen);
con->request.http_host = http_header_request_get(con, HTTP_HEADER_HOST, CONST_STR_LEN("Host"));
}
return i;
state->reqline_len = i;
return 0;
}
int http_request_parse(server *srv, connection *con, buffer *hdrs) {
@ -814,22 +759,22 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
char *value = NULL;
size_t i, first, ilen;
const unsigned int http_header_strict = (con->conf.http_parseopts & HTTP_PARSEOPT_HEADER_STRICT);
int status;
parse_header_state state;
init_parse_header_state(&state);
i = first = http_request_parse_reqline(srv, con, hdrs, &state);
if (0 == i) goto failure;
status = http_request_parse_reqline(srv, con, hdrs, &state);
if (0 != status) return status;
i = first = state.reqline_len;
if (ptr[i] == ' ' || ptr[i] == '\t') {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "WS at the start of first line -> 400");
}
goto failure;
return http_request_header_line_invalid(srv, 400, "WS at the start of first line -> 400");
}
ilen = buffer_string_length(hdrs);
for (int is_key = 1, key_len = 0, done = 0; i <= ilen && !done; ++i) {
for (int is_key = 1, key_len = 0; i < ilen; ++i) {
char *cur = ptr + i;
if (is_key) {
@ -844,11 +789,7 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
/* skip every thing up to the : */
do { ++cur; } while (*cur == ' ' || *cur == '\t');
if (*cur != ':') {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "WS character in key -> 400");
}
goto failure;
return http_request_header_line_invalid(srv, 400, "WS character in key -> 400");
}
/* fall through */
case ':':
@ -873,46 +814,26 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
case '=':
case '{':
case '}':
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "ssds",
"invalid character in key", cur, *cur, "-> 400");
}
goto failure;
return http_request_header_char_invalid(srv, *cur, "invalid character in header key -> 400");
case '\r':
if (ptr[i+1] == '\n' && i == first) {
/* End of Header */
ptr[i] = '\0';
ptr[i+1] = '\0';
i++;
done = 1;
++i;
} else {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "CR without LF -> 400");
}
goto failure;
return http_request_header_line_invalid(srv, 400, "CR without LF -> 400");
}
break;
case '\n':
if (http_header_strict) {
http_request_missing_CR_before_LF(srv, con);
goto failure;
return http_request_header_line_invalid(srv, 400, "missing CR before LF in header -> 400");
} else if (i == first) {
ptr[i] = '\0';
done = 1;
/* End of Header */
break;
}
/* fall through */
default:
if (http_header_strict ? (*cur < 32 || ((unsigned char)*cur) >= 127) : *cur == '\0') {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "ssds",
"invalid character in key", cur, *cur, "-> 400");
}
goto failure;
return http_request_header_char_invalid(srv, *cur, "invalid character in header key -> 400");
}
/* ok */
break;
@ -921,11 +842,7 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
switch(*cur) {
case '\r':
if (cur[1] != '\n') {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "CR without LF -> 400");
}
goto failure;
return http_request_header_line_invalid(srv, 400, "CR without LF -> 400");
}
if (cur[2] == ' ' || cur[2] == '\t') { /* header line folding */
cur[0] = ' ';
@ -938,8 +855,7 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
case '\n':
if (*cur == '\n') {
if (http_header_strict) {
http_request_missing_CR_before_LF(srv, con);
goto failure;
return http_request_header_line_invalid(srv, 400, "missing CR before LF in header -> 400");
}
if (cur[1] == ' ' || cur[1] == '\t') { /* header line folding */
cur[0] = ' ';
@ -951,10 +867,8 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
/* End of Headerline */
*cur = '\0'; /*(for if value is further parsed and '\0' is expected at end of string)*/
if (!parse_single_header(srv, con, &state, ptr + first, key_len, value, cur - value)) {
/* parse_single_header should already have logged it */
goto failure;
}
status = parse_single_header(srv, con, &state, ptr + first, key_len, value, cur - value);
if (0 != status) return status;
first = i+1;
is_key = 1;
@ -965,20 +879,13 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
break;
default:
if (http_header_strict ? (*cur >= 0 && *cur < 32) : *cur == '\0') {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "sds",
"invalid char in header", (int)*cur, "-> 400");
}
goto failure;
return http_request_header_char_invalid(srv, *cur, "invalid character in header -> 400");
}
break;
}
}
}
con->header_len = i;
/* do some post-processing */
if (con->request.http_version == HTTP_VERSION_1_1) {
@ -994,11 +901,7 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
/* RFC 2616, 14.23 */
if (con->request.http_host == NULL ||
buffer_string_is_empty(con->request.http_host)) {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s", "HTTP/1.1 but Host missing -> 400");
}
goto failure;
return http_request_header_line_invalid(srv, 400, "HTTP/1.1 but Host missing -> 400");
}
} else {
if (state.keep_alive_set == HTTP_CONNECTION_KEEPALIVE) {
@ -1014,29 +917,20 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
/* check hostname field if it is set */
if (!buffer_is_empty(con->request.http_host) &&
0 != http_request_host_policy(con, con->request.http_host, con->proto)) {
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "s",
"Invalid Hostname -> 400");
}
goto failure;
return http_request_header_line_invalid(srv, 400, "Invalid Hostname -> 400");
}
if (con->request.htags & HTTP_HEADER_TRANSFER_ENCODING) {
buffer *vb = http_header_request_get(con, HTTP_HEADER_TRANSFER_ENCODING, CONST_STR_LEN("Transfer-Encoding"));
if (NULL != vb) {
if (con->request.http_version == HTTP_VERSION_1_0) {
log_error_write(srv, __FILE__, __LINE__, "s",
"HTTP/1.0 with Transfer-Encoding (bad HTTP/1.0 proxy?) -> 400");
goto failure;
return http_request_header_line_invalid(srv, 400, "HTTP/1.0 with Transfer-Encoding (bad HTTP/1.0 proxy?) -> 400");
}
if (0 != buffer_caseless_compare(CONST_BUF_LEN(vb), CONST_STR_LEN("chunked"))) {
/* Transfer-Encoding might contain additional encodings,
* which are not currently supported by lighttpd */
con->http_status = 501; /* Not Implemented */
goto failure;
return http_request_header_line_invalid(srv, 501, NULL); /* Not Implemented */
}
/* reset value for Transfer-Encoding, a hop-by-hop header,
@ -1061,22 +955,13 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
case HTTP_METHOD_HEAD:
/* content-length is forbidden for those */
if (state.con_length_set && con->request.content_length != 0) {
/* content-length is missing */
log_error_write(srv, __FILE__, __LINE__, "s",
"GET/HEAD with content-length -> 400");
goto failure;
return http_request_header_line_invalid(srv, 400, "GET/HEAD with content-length -> 400");
}
break;
case HTTP_METHOD_POST:
/* content-length is required for them */
if (!state.con_length_set) {
/* content-length is missing */
log_error_write(srv, __FILE__, __LINE__, "s",
"POST-request, but content-length missing -> 411");
con->http_status = 411;
goto failure;
return http_request_header_line_invalid(srv, 411, "POST-request, but content-length missing -> 411");
}
break;
default:
@ -1084,8 +969,4 @@ int http_request_parse(server *srv, connection *con, buffer *hdrs) {
}
return 0;
failure:
if (!con->http_status) con->http_status = 400;
return -1;
}

7
src/t/test_request.c
View File

@ -29,13 +29,14 @@ static void test_request_connection_reset(connection *con)
static void run_http_request_parse(server *srv, connection *con, int line, int status, const char *desc, const char *req, size_t reqlen)
{
int http_status;
test_request_connection_reset(con);
buffer_copy_string_len(con->request.request, req, reqlen);
http_request_parse(srv, con, con->request.request);
if (con->http_status != status) {
http_status = http_request_parse(srv, con, con->request.request);
if (http_status != status) {
fprintf(stderr,
"%s.%d: %s() failed: expected '%d', got '%d' for test %s\n",
__FILE__, line, "http_request_parse", status, con->http_status,
__FILE__, line, "http_request_parse", status, http_status,
desc);
fflush(stderr);
abort();