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lighttpd1.4/src/request.c

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#include "first.h"
#include "request.h"
#include "base.h"
#include "burl.h"
#include "http_header.h"
#include "http_kv.h"
#include "log.h"
#include "sock_addr.h"
#include <limits.h>
#include <stdlib.h>
#include <string.h>
static int request_check_hostname(buffer *host) {
enum { DOMAINLABEL, TOPLABEL } stage = TOPLABEL;
size_t i;
int label_len = 0;
size_t host_len, hostport_len;
char *colon;
int is_ip = -1; /* -1 don't know yet, 0 no, 1 yes */
int level = 0;
/*
* hostport = host [ ":" port ]
* host = hostname | IPv4address | IPv6address
* hostname = *( domainlabel "." ) toplabel [ "." ]
* domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
* toplabel = alpha | alpha *( alphanum | "-" ) alphanum
* IPv4address = 1*digit "." 1*digit "." 1*digit "." 1*digit
* IPv6address = "[" ... "]"
* port = *digit
*/
/* IPv6 adress */
if (host->ptr[0] == '[') {
char *c = host->ptr + 1;
int colon_cnt = 0;
/* check the address inside [...] */
for (; *c && *c != ']'; c++) {
if (*c == ':') {
if (++colon_cnt > 7) {
return -1;
}
} else if (!light_isxdigit(*c) && '.' != *c) {
return -1;
}
}
/* missing ] */
if (!*c) {
return -1;
}
/* check port */
if (*(c+1) == ':') {
for (c += 2; *c; c++) {
if (!light_isdigit(*c)) {
return -1;
}
}
}
else if ('\0' != *(c+1)) {
/* only a port is allowed to follow [...] */
return -1;
}
return 0;
}
hostport_len = host_len = buffer_string_length(host);
if (NULL != (colon = memchr(host->ptr, ':', host_len))) {
char *c = colon + 1;
/* check portnumber */
for (; *c; c++) {
if (!light_isdigit(*c)) return -1;
}
/* remove the port from the host-len */
host_len = colon - host->ptr;
}
/* Host is empty */
if (host_len == 0) return -1;
/* if the hostname ends in a "." strip it */
if (host->ptr[host_len-1] == '.') {
/* shift port info one left */
if (NULL != colon) memmove(colon-1, colon, hostport_len - host_len);
buffer_string_set_length(host, --hostport_len);
if (--host_len == 0) return -1;
}
/* scan from the right and skip the \0 */
for (i = host_len; i-- > 0; ) {
const char c = host->ptr[i];
switch (stage) {
case TOPLABEL:
if (c == '.') {
/* only switch stage, if this is not the last character */
if (i != host_len - 1) {
if (label_len == 0) {
return -1;
}
/* check the first character at right of the dot */
if (is_ip == 0) {
if (!light_isalnum(host->ptr[i+1])) {
return -1;
}
} else if (!light_isdigit(host->ptr[i+1])) {
is_ip = 0;
} else if ('-' == host->ptr[i+1]) {
return -1;
} else {
/* just digits */
is_ip = 1;
}
stage = DOMAINLABEL;
label_len = 0;
level++;
} else if (i == 0) {
/* just a dot and nothing else is evil */
return -1;
}
} else if (i == 0) {
/* the first character of the hostname */
if (!light_isalnum(c)) {
return -1;
}
label_len++;
} else {
if (c != '-' && !light_isalnum(c)) {
return -1;
}
if (is_ip == -1) {
if (!light_isdigit(c)) is_ip = 0;
}
label_len++;
}
break;
case DOMAINLABEL:
if (is_ip == 1) {
if (c == '.') {
if (label_len == 0) {
return -1;
}
label_len = 0;
level++;
} else if (!light_isdigit(c)) {
return -1;
} else {
label_len++;
}
} else {
if (c == '.') {
if (label_len == 0) {
return -1;
}
/* c is either - or alphanum here */
if ('-' == host->ptr[i+1]) {
return -1;
}
label_len = 0;
level++;
} else if (i == 0) {
if (!light_isalnum(c)) {
return -1;
}
label_len++;
} else {
if (c != '-' && !light_isalnum(c)) {
return -1;
}
label_len++;
}
}
break;
}
}
/* a IP has to consist of 4 parts */
if (is_ip == 1 && level != 3) {
return -1;
}
if (label_len == 0) {
return -1;
}
return 0;
}
int http_request_host_normalize(buffer *b, int scheme_port) {
/*
* check for and canonicalize numeric IP address and portnum (optional)
* (IP address may be followed by ":portnum" (optional))
* - IPv6: "[...]"
* - IPv4: "x.x.x.x"
* - IPv4: 12345678 (32-bit decimal number)
* - IPv4: 012345678 (32-bit octal number)
* - IPv4: 0x12345678 (32-bit hex number)
*
* allow any chars (except ':' and '\0' and stray '[' or ']')
* (other code may check chars more strictly or more pedantically)
* ':' delimits (optional) port at end of string
* "[]" wraps IPv6 address literal
* '\0' should have been rejected earlier were it present
*
* any chars includes, but is not limited to:
* - allow '-' any where, even at beginning of word
* (security caution: might be confused for cmd flag if passed to shell)
* - allow all-digit TLDs
* (might be mistaken for IPv4 addr by inet_aton()
* unless non-digits appear in subdomain)
*/
/* Note: not using getaddrinfo() since it does not support "[]" around IPv6
* and is not as lenient as inet_aton() and inet_addr() for IPv4 strings.
* Not using inet_pton() (when available) on IPv4 for similar reasons. */
const char * const p = b->ptr;
const size_t blen = buffer_string_length(b);
long port = 0;
if (*p != '[') {
char * const colon = (char *)memchr(p, ':', blen);
if (colon) {
if (*p == ':') return -1; /*(empty host then port, or naked IPv6)*/
if (colon[1] != '\0') {
char *e;
port = strtol(colon+1, &e, 0); /*(allow decimal, octal, hex)*/
if (0 < port && port <= USHRT_MAX && *e == '\0') {
/* valid port */
} else {
return -1;
}
} /*(else ignore stray colon at string end)*/
buffer_string_set_length(b, (size_t)(colon - p)); /*(remove port str)*/
}
if (light_isdigit(*p)) do {
/* (IPv4 address literal or domain starting w/ digit (e.g. 3com))*/
/* (check one-element cache of normalized IPv4 address string) */
static struct { char s[INET_ADDRSTRLEN]; size_t n; } laddr;
size_t n = colon ? (size_t)(colon - p) : blen;
sock_addr addr;
if (n == laddr.n && 0 == memcmp(p, laddr.s, n)) break;
if (1 == sock_addr_inet_pton(&addr, p, AF_INET, 0)) {
sock_addr_inet_ntop_copy_buffer(b, &addr);
n = buffer_string_length(b);
if (n < sizeof(laddr.s)) memcpy(laddr.s, b->ptr, (laddr.n = n));
}
} while (0);
} else do { /* IPv6 addr */
#if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
/* (check one-element cache of normalized IPv4 address string) */
static struct { char s[INET6_ADDRSTRLEN]; size_t n; } laddr;
sock_addr addr;
char *bracket = b->ptr+blen-1;
char *percent = strchr(b->ptr+1, '%');
size_t len;
int rc;
char buf[INET6_ADDRSTRLEN+16]; /*(+16 for potential %interface name)*/
if (blen <= 2) return -1; /*(invalid "[]")*/
if (*bracket != ']') {
bracket = (char *)memchr(b->ptr+1, ']', blen-1);
if (NULL == bracket || bracket[1] != ':' || bracket - b->ptr == 1){
return -1;
}
if (bracket[2] != '\0') { /*(ignore stray colon at string end)*/
char *e;
port = strtol(bracket+2, &e, 0); /*(allow decimal, octal, hex)*/
if (0 < port && port <= USHRT_MAX && *e == '\0') {
/* valid port */
} else {
return -1;
}
}
}
len = (size_t)((percent ? percent : bracket) - (b->ptr+1));
if (laddr.n == len && 0 == memcmp(laddr.s, b->ptr+1, len)) {
/* truncate after ']' and re-add normalized port, if needed */
buffer_string_set_length(b, (size_t)(bracket - b->ptr + 1));
break;
}
*bracket = '\0';/*(terminate IPv6 string)*/
if (percent) *percent = '\0'; /*(remove %interface from address)*/
rc = sock_addr_inet_pton(&addr, b->ptr+1, AF_INET6, 0);
if (percent) *percent = '%'; /*(restore %interface)*/
*bracket = ']'; /*(restore bracket)*/
if (1 != rc) return -1;
sock_addr_inet_ntop(&addr, buf, sizeof(buf));
len = strlen(buf);
if (percent) {
if (percent > bracket) return -1;
if (len + (size_t)(bracket - percent) >= sizeof(buf)) return -1;
if (len < sizeof(laddr.s)) memcpy(laddr.s, buf, (laddr.n = len));
memcpy(buf+len, percent, (size_t)(bracket - percent));
len += (size_t)(bracket - percent);
}
buffer_string_set_length(b, 1); /* truncate after '[' */
buffer_append_string_len(b, buf, len);
buffer_append_string_len(b, CONST_STR_LEN("]"));
#else
return -1;
#endif
} while (0);
if (0 != port && port != scheme_port) {
buffer_append_string_len(b, CONST_STR_LEN(":"));
buffer_append_int(b, (int)port);
}
return 0;
}
static int scheme_port (const buffer *scheme)
{
return buffer_is_equal_string(scheme, CONST_STR_LEN("https")) ? 443 : 80;
}
int http_request_host_policy (connection *con, buffer *b, const buffer *scheme) {
return (((con->conf.http_parseopts & HTTP_PARSEOPT_HOST_STRICT)
&& 0 != request_check_hostname(b))
|| ((con->conf.http_parseopts & HTTP_PARSEOPT_HOST_NORMALIZE)
&& 0 != http_request_host_normalize(b, scheme_port(scheme))));
}
static int http_request_split_value(array *vals, const char *current, size_t len) {
int state = 0;
const char *token_start = NULL, *token_end = NULL;
/*
* parse
*
* val1, val2, val3, val4
*
* into a array (more or less a explode() incl. stripping of whitespaces
*/
for (size_t i = 0; i <= len; ++i, ++current) {
switch (state) {
case 0: /* find start of a token */
switch (*current) {
case ' ':
case '\t': /* skip white space */
case ',': /* skip empty token */
break;
case '\0': /* end of string */
return 0;
default:
/* found real data, switch to state 1 to find the end of the token */
token_start = token_end = current;
state = 1;
break;
}
break;
case 1: /* find end of token and last non white space character */
switch (*current) {
case ' ':
case '\t':
/* space - don't update token_end */
break;
case ',':
case '\0': /* end of string also marks the end of a token */
array_insert_value(vals, token_start, token_end-token_start+1);
state = 0;
break;
default:
/* no white space, update token_end to include current character */
token_end = current;
break;
}
break;
}
}
return 0;
}
static int request_uri_is_valid_char(unsigned char c) {
return (c > 32 && c != 127 && c != 255);
}
__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 {
HTTP_CONNECTION_UNSET,
HTTP_CONNECTION_KEEPALIVE,
HTTP_CONNECTION_CLOSE,
};
typedef struct {
enum keep_alive_set keep_alive_set;
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) {
state->keep_alive_set = HTTP_CONNECTION_UNSET;
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 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);
buffer **saveb = NULL;
/* strip leading whitespace */
for (; vlen > 0 && (v[0] == ' ' || v[0] == '\t'); ++v, --vlen) ;
/* strip trailing whitespace */
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 0; /* ignore header */
/*
* Note: k might not be '\0'-terminated
*/
switch (id) {
/*case HTTP_HEADER_OTHER:*/
default:
break;
case HTTP_HEADER_HOST:
if (!(con->request.htags & HTTP_HEADER_HOST)) {
saveb = &con->request.http_host;
if (vlen >= 1024) { /*(expecting < 256)*/
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 0; /* ignore header */
}
else {
return http_request_header_line_invalid(srv, 400, "duplicate Host header -> 400");
}
break;
case HTTP_HEADER_CONNECTION:
{
array * const vals = srv->split_vals;
array_reset_data_strings(vals);
http_request_split_value(vals, v, vlen); /* split on , */
for (size_t vi = 0; vi < vals->used; ++vi) {
data_string *dsv = (data_string *)vals->data[vi];
if (buffer_eq_icase_slen(dsv->value,
CONST_STR_LEN("keep-alive"))) {
state->keep_alive_set = HTTP_CONNECTION_KEEPALIVE;
break;
}
else if (buffer_eq_icase_slen(dsv->value,
CONST_STR_LEN("close"))) {
state->keep_alive_set = HTTP_CONNECTION_CLOSE;
break;
}
}
}
break;
case HTTP_HEADER_CONTENT_TYPE:
if (con->request.htags & HTTP_HEADER_CONTENT_TYPE) {
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 0; /* ignore header */
}
break;
case HTTP_HEADER_CONTENT_LENGTH:
if (!(con->request.htags & HTTP_HEADER_CONTENT_LENGTH)) {
char *err;
off_t r = strtoll(v, &err, 10);
if (*err == '\0' && r >= 0) {
con->request.content_length = r;
}
else {
return http_request_header_line_invalid(srv, 400, "invalid Content-Length header -> 400");
}
}
else {
return http_request_header_line_invalid(srv, 400, "duplicate Content-Length header -> 400");
}
break;
case HTTP_HEADER_IF_MODIFIED_SINCE:
if (con->request.htags & HTTP_HEADER_IF_MODIFIED_SINCE) {
/* Proxies sometimes send dup headers
* if they are the same we ignore the second
* if not, we raise an error */
buffer *vb =
http_header_request_get(con, HTTP_HEADER_IF_MODIFIED_SINCE,
CONST_STR_LEN("If-Modified-Since"));
if (vb && buffer_is_equal_caseless_string(vb, v, vlen)) {
/* ignore it if they are the same */
return 0; /* ignore header */
}
else {
return http_request_header_line_invalid(srv, 400, "duplicate If-Modified-Since header -> 400");
}
}
break;
}
con->request.htags |= id;
http_header_request_append(con, id, k, klen, v, vlen);
if (saveb) {
*saveb = http_header_request_get(con, id, k, klen);
}
return 0;
}
static size_t http_request_parse_reqline(server *srv, connection *con, buffer *hdrs, parse_header_state *state) {
char * const ptr = hdrs->ptr;
char *uri = NULL, *proto = NULL;
size_t i;
const unsigned int http_header_strict = (con->conf.http_parseopts & HTTP_PARSEOPT_HEADER_STRICT);
/* hdrs must end with '\n' (already checked before parsing headers) */
#ifdef __COVERITY__
if (NULL == strchr(ptr, '\n')) return 400;
#endif
/*
* Request: "^(GET|POST|HEAD) ([^ ]+(\\?[^ ]+|)) (HTTP/1\\.[01])$"
* Option : "^([-a-zA-Z]+): (.+)$"
* End : "^$"
*/
/* parse the first line of the request
*
* should be:
*
* <method> <uri> <protocol>\r\n
* */
for (i = 0; ptr[i] != '\n'; ++i) {
if (ptr[i] == ' ') {
if (NULL == uri) uri = ptr + i + 1;
else if (NULL == proto) proto = ptr + i + 1;
else return http_request_header_line_invalid(srv, 400, "overlong request line; extra space -> 400"); /* ERROR, one space to much */
}
}
ptr[i] = '\0';
state->reqline_len = i+1;
{
char *nuri = NULL;
size_t j, jlen;
/* \r\n -> \0\0 */
#ifdef __COVERITY__
if (0 == i) return 400;
#endif
if (ptr[i-1] == '\r') {
ptr[i-1] = '\0';
} else if (http_header_strict) { /* '\n' */
return http_request_header_line_invalid(srv, 400, "missing CR before LF in header -> 400");
}
if (NULL == proto) {
return http_request_header_line_invalid(srv, 400, "incomplete request line -> 400");
}
con->request.http_method = get_http_method_key(ptr, uri - 1 - ptr);
if (HTTP_METHOD_UNSET == con->request.http_method) {
return http_request_header_line_invalid(srv, 501, "unknown http-method -> 501");
}
/*
* RFC7230:
* HTTP-version = HTTP-name "/" DIGIT "." DIGIT
* HTTP-name = %x48.54.54.50 ; "HTTP", case-sensitive
*/
if (proto[0]=='H' && proto[1]=='T' && proto[2]=='T' && proto[3]=='P' && proto[4] == '/') {
if (proto[5] == '1' && proto[6] == '.' && (proto[7] == '1' || proto[7] == '0')) {
con->request.http_version = (proto[7] == '1') ? HTTP_VERSION_1_1 : HTTP_VERSION_1_0;
} else {
return http_request_header_line_invalid(srv, 505, "unknown HTTP version -> 505");
}
} else {
return http_request_header_line_invalid(srv, 400, "unknown protocol -> 400");
}
jlen = (size_t)(proto - uri - 1);
if (*uri == '/') {
/* (common case) */
buffer_copy_string_len(con->request.uri, uri, jlen);
} else if (jlen > 7 && buffer_eq_icase_ssn(uri, "http://", 7) &&
NULL != (nuri = memchr(uri + 7, '/', jlen-7))) {
state->reqline_host = uri + 7;
state->reqline_hostlen = nuri - state->reqline_host;
buffer_copy_string_len(con->request.uri, nuri, proto - nuri - 1);
} else if (jlen > 8 && buffer_eq_icase_ssn(uri, "https://", 8) &&
NULL != (nuri = memchr(uri + 8, '/', jlen-8))) {
state->reqline_host = uri + 8;
state->reqline_hostlen = nuri - state->reqline_host;
buffer_copy_string_len(con->request.uri, nuri, proto - nuri - 1);
} else if (!http_header_strict
|| (HTTP_METHOD_CONNECT == con->request.http_method && (uri[0] == ':' || light_isdigit(uri[0])))
|| (HTTP_METHOD_OPTIONS == con->request.http_method && uri[0] == '*' && 1 == jlen)) {
buffer_copy_string_len(con->request.uri, uri, jlen);
} else {
return http_request_header_line_invalid(srv, 400, "request-URI parse error -> 400");
}
/* check uri for invalid characters */
jlen = buffer_string_length(con->request.uri);
if (0 == jlen) return http_request_header_line_invalid(srv, 400, "no uri specified -> 400");
if ((con->conf.http_parseopts & HTTP_PARSEOPT_URL_NORMALIZE_CTRLS_REJECT)) {
j = jlen; /* URI will be checked in http_response_prepare() */
} else if (http_header_strict) {
for (j = 0; j < jlen && request_uri_is_valid_char(con->request.uri->ptr[j]); j++) ;
} else {
char *z = memchr(con->request.uri->ptr, '\0', jlen);
j = (NULL == z) ? jlen : (size_t)(z - con->request.uri->ptr);
}
if (j < jlen) {
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);
}
if (state->reqline_host) {
/* Insert as host header */
if (state->reqline_hostlen >= 1024) { /*(expecting < 256)*/
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 0;
}
int http_request_parse(server *srv, connection *con, buffer *hdrs) {
char * const ptr = hdrs->ptr;
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);
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') {
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; i < ilen; ++i) {
char *cur = ptr + i;
if (is_key) {
/**
* 1*<any CHAR except CTLs or separators>
* CTLs == 0-31 + 127, CHAR = 7-bit ascii (0..127)
*
*/
switch(*cur) {
case ' ':
case '\t':
/* RFC7230 Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
* 3.2.4. Field Parsing
* [...]
* No whitespace is allowed between the header field-name and colon. In
* the past, differences in the handling of such whitespace have led to
* security vulnerabilities in request routing and response handling. A
* server MUST reject any received request message that contains
* whitespace between a header field-name and colon with a response code
* of 400 (Bad Request). A proxy MUST remove any such whitespace from a
* response message before forwarding the message downstream.
*/
if (http_header_strict)
return http_request_header_line_invalid(srv, 400, "invalid whitespace between field-name and colon -> 400");
/* skip every thing up to the : */
do { ++cur; } while (*cur == ' ' || *cur == '\t');
if (*cur != ':') {
return http_request_header_line_invalid(srv, 400, "WS character in key -> 400");
}
/* fall through */
case ':':
is_key = 0;
key_len = i - first;
value = cur + 1;
i = cur - ptr;
break;
case '(':
case ')':
case '<':
case '>':
case '@':
case ',':
case ';':
case '\\':
case '\"':
case '/':
case '[':
case ']':
case '?':
case '=':
case '{':
case '}':
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 */
++i;
} else {
return http_request_header_line_invalid(srv, 400, "CR without LF -> 400");
}
break;
case '\n':
if (http_header_strict) {
return http_request_header_line_invalid(srv, 400, "missing CR before LF in header -> 400");
} else if (i == first) {
/* End of Header */
break;
}
/* fall through */
default:
if (http_header_strict ? (*cur < 32 || ((unsigned char)*cur) >= 127) : *cur == '\0') {
return http_request_header_char_invalid(srv, *cur, "invalid character in header key -> 400");
}
/* ok */
break;
}
} else {
switch(*cur) {
case '\r':
if (cur[1] != '\n') {
return http_request_header_line_invalid(srv, 400, "CR without LF -> 400");
}
if (cur[2] == ' ' || cur[2] == '\t') { /* header line folding */
cur[0] = ' ';
cur[1] = ' ';
i += 2;
continue;
}
++i;
/* fall through */
case '\n':
if (*cur == '\n') {
if (http_header_strict) {
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] = ' ';
i += 1;
continue;
}
}
/* End of Headerline */
*cur = '\0'; /*(for if value is further parsed and '\0' is expected at end of string)*/
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;
value = NULL;
break;
case ' ':
case '\t':
break;
default:
if (http_header_strict ? (*cur >= 0 && *cur < 32) : *cur == '\0') {
return http_request_header_char_invalid(srv, *cur, "invalid character in header -> 400");
}
break;
}
}
}
/* do some post-processing */
if (con->request.http_version == HTTP_VERSION_1_1) {
if (state.keep_alive_set != HTTP_CONNECTION_CLOSE) {
/* no Connection-Header sent */
/* HTTP/1.1 -> keep-alive default TRUE */
con->keep_alive = 1;
} else {
con->keep_alive = 0;
}
/* RFC 2616, 14.23 */
if (con->request.http_host == NULL ||
buffer_string_is_empty(con->request.http_host)) {
return http_request_header_line_invalid(srv, 400, "HTTP/1.1 but Host missing -> 400");
}
} else {
if (state.keep_alive_set == HTTP_CONNECTION_KEEPALIVE) {
/* no Connection-Header sent */
/* HTTP/1.0 -> keep-alive default FALSE */
con->keep_alive = 1;
} else {
con->keep_alive = 0;
}
}
/* 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)) {
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) {
return http_request_header_line_invalid(srv, 400, "HTTP/1.0 with Transfer-Encoding (bad HTTP/1.0 proxy?) -> 400");
}
if (!buffer_eq_icase_slen(vb, CONST_STR_LEN("chunked"))) {
/* Transfer-Encoding might contain additional encodings,
* which are not currently supported by lighttpd */
return http_request_header_line_invalid(srv, 501, NULL); /* Not Implemented */
}
/* reset value for Transfer-Encoding, a hop-by-hop header,
* which must not be blindly forwarded to backends */
http_header_request_unset(con, HTTP_HEADER_TRANSFER_ENCODING, CONST_STR_LEN("Transfer-Encoding"));
if (con->request.htags & HTTP_HEADER_CONTENT_LENGTH) {
/* RFC7230 Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
* 3.3.3. Message Body Length
* [...]
* If a message is received with both a Transfer-Encoding and a
* Content-Length header field, the Transfer-Encoding overrides the
* Content-Length. Such a message might indicate an attempt to
* perform request smuggling (Section 9.5) or response splitting
* (Section 9.4) and ought to be handled as an error. A sender MUST
* remove the received Content-Length field prior to forwarding such
* a message downstream.
*/
if (http_header_strict) {
return http_request_header_line_invalid(srv, 400, "invalid Transfer-Encoding + Content-Length -> 400");
}
else {
/* ignore Content-Length */
http_header_request_unset(con, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length"));
}
}
state.con_length_set = 1;
con->request.content_length = -1;
}
}
else if (con->request.htags & HTTP_HEADER_CONTENT_LENGTH) {
state.con_length_set = 1;
}
switch(con->request.http_method) {
case HTTP_METHOD_GET:
case HTTP_METHOD_HEAD:
/* content-length is forbidden for those */
if (state.con_length_set && 0 != con->request.content_length
&& !(con->conf.http_parseopts & HTTP_PARSEOPT_METHOD_GET_BODY)) {
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) {
return http_request_header_line_invalid(srv, 411, "POST-request, but content-length missing -> 411");
}
break;
default:
break;
}
return 0;
}