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http.c
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http.c
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/*
* HTTP handling routines and related socket stuff for CNTLM
*
* CNTLM is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* CNTLM is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
* St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (c) 2007 David Kubicek
*
*/
#include <sys/types.h>
#include <sys/select.h>
#include <sys/time.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include "utils.h"
#include "socket.h"
#include "ntlm.h"
#include "http.h"
#define BLOCK 2048
extern int debug;
/*
* Ture if src is a header. This is just a basic check
* for the colon delimiter. Might eventually become more
* sophisticated. :)
*/
int is_http_header(const char *src) {
return strcspn(src, ":") != strlen(src);
}
/*
* Extract the header name from the source.
*/
char *get_http_header_name(const char *src) {
int i;
i = strcspn(src, ":");
if (i != strlen(src))
return substr(src, 0, i);
else
return NULL;
}
/*
* Extract the header value from the source.
*/
char *get_http_header_value(const char *src) {
char *sub;
if ((sub = strchr(src, ':'))) {
sub++;
while (*sub == ' ')
sub++;
return strdup(sub);
} else
return NULL;
}
/*
* Receive HTTP request/response from the given socket. Fill in pre-allocated
* rr_data_t structure.
* Returns: 1 if OK, 0 in case of socket EOF or other error
*/
int headers_recv(int fd, rr_data_t data) {
int i, bsize;
int len, is_http = 0;
char *buf;
char *tok, *s3 = 0;
char *orig = NULL;
char *ccode = NULL;
char *host = NULL;
bsize = BUFSIZE;
buf = new(bsize);
i = so_recvln(fd, &buf, &bsize);
if (i <= 0)
goto bailout;
if (debug)
printf("HEAD: %s", buf);
/*
* Are we reading HTTP request (from client) or response (from server)?
*/
trimr(buf);
orig = strdup(buf);
len = strlen(buf);
tok = strtok_r(buf, " ", &s3);
if (tok && ((is_http = !strncasecmp(tok, "HTTP/", 5)) || !strncasecmp(tok, "ICY", 3))) {
data->req = 0;
data->empty = 0;
data->http = strdup(tok);
data->msg = NULL;
/*
* Let's find out the numeric version of the HTTP version: 09, 10, 11.
* Set to -1 if header is misformatted.
*/
if (is_http && (tok = strchr(data->http, '/')) && strlen(tok) >= 4 && isdigit(tok[1]) && isdigit(tok[3])) {
data->http_version = (tok[1] - 0x30) * 10 + (tok[3] - 0x30);
} else {
data->http_version = -1;
}
tok = strtok_r(NULL, " ", &s3);
if (tok) {
ccode = strdup(tok);
tok += strlen(ccode);
while (tok < buf+len && *tok++ == ' ');
if (strlen(tok))
data->msg = strdup(tok);
}
if (!data->msg)
data->msg = strdup("");
if (!ccode || strlen(ccode) != 3 || (data->code = atoi(ccode)) == 0) {
i = -2;
goto bailout;
}
} else if (strstr(orig, " HTTP/") && tok) {
data->req = 1;
data->empty = 0;
data->method = NULL;
data->url = NULL;
data->rel_url = NULL;
data->http = NULL;
data->hostname = NULL;
data->method = strdup(tok);
tok = strtok_r(NULL, " ", &s3);
if (tok)
data->url = strdup(tok);
tok = strtok_r(NULL, " ", &s3);
if (tok)
data->http = strdup(tok);
if (!data->url || !data->http) {
i = -3;
goto bailout;
}
/*
* Let's find out the numeric version of the HTTP version: 09, 10, 11.
* Set to -1 if header is misformatted.
*/
if ((tok = strchr(data->http, '/')) && strlen(tok) >= 4 && isdigit(tok[1]) && isdigit(tok[3])) {
data->http_version = (tok[1] - 0x30) * 10 + (tok[3] - 0x30);
} else {
data->http_version = -1;
}
if ((tok = strstr(data->url, "://"))) {
tok += 3;
} else {
tok = data->url;
}
s3 = strchr(tok, '/');
if (s3) {
host = substr(tok, 0, s3-tok);
data->rel_url = strdup(s3);
} else {
host = substr(tok, 0, strlen(tok));
data->rel_url = strdup("/");
}
} else {
if (debug)
printf("headers_recv: Unknown header (%s).\n", orig);
i = -4;
goto bailout;
}
/*
* Read in all headers, do not touch any possible HTTP body
*/
do {
i = so_recvln(fd, &buf, &bsize);
trimr(buf);
if (i > 0 && is_http_header(buf)) {
data->headers = hlist_add(data->headers, get_http_header_name(buf), get_http_header_value(buf), HLIST_NOALLOC, HLIST_NOALLOC);
}
} while (strlen(buf) != 0 && i > 0);
if (data->req) {
/*
* Fix requests, make sure the Host: header is present
*/
if (host && strlen(host)) {
data->hostname = strdup(host);
if (!hlist_get(data->headers, "Host"))
data->headers = hlist_add(data->headers, "Host", host, HLIST_ALLOC, HLIST_ALLOC);
} else {
if (debug)
printf("headers_recv: no host name (%s)\n", orig);
i = -6;
goto bailout;
}
/*
* Remove port number from internal host name variable
*/
if (data->hostname && (tok = strchr(data->hostname, ':'))) {
*tok = 0;
data->port = atoi(tok+1);
} else if (data->url) {
if (!strncasecmp(data->url, "https", 5))
data->port = 443;
else
data->port = 80;
}
if (!strlen(data->hostname) || !data->port) {
i = -5;
goto bailout;
}
}
bailout:
if (orig) free(orig);
if (ccode) free(ccode);
if (host) free(host);
free(buf);
if (i <= 0) {
if (debug)
printf("headers_recv: fd %d error %d\n", fd, i);
return 0;
}
return 1;
}
/*
* Send HTTP request/response to the given socket based on what's in "data".
* Returns: 1 if OK, 0 in case of socket error
*/
int headers_send(int fd, rr_data_t data) {
hlist_t t;
char *buf;
int i, len;
/*
* First compute required buffer size (avoid realloc, etc)
*/
if (data->req)
len = 20 + strlen(data->method) + strlen(data->url) + strlen(data->http);
else
len = 20 + strlen(data->http) + strlen(data->msg);
t = data->headers;
while (t) {
len += 20 + strlen(t->key) + strlen(t->value);
t = t->next;
}
/*
* We know how much memory we need now...
*/
buf = new(len);
/*
* Prepare the first request/response line
*/
len = 0;
if (data->req)
len = sprintf(buf, "%s %s %s\r\n", data->method, data->url, data->http);
else if (!data->skip_http)
len = sprintf(buf, "%s %03d %s\r\n", data->http, data->code, data->msg);
/*
* Now add all headers.
*/
t = data->headers;
while (t) {
len += sprintf(buf+len, "%s: %s\r\n", t->key, t->value);
t = t->next;
}
/*
* Terminate headers
*/
strcat(buf, "\r\n");
/*
* Flush it all down the toilet
*/
if (!so_closed(fd))
i = write(fd, buf, len+2);
else
i = -999;
free(buf);
if (i <= 0 || i != len+2) {
if (debug)
printf("headers_send: fd %d warning %d (connection closed)\n", fd, i);
return 0;
}
return 1;
}
/*
* Forward "size" of data from "src" to "dst". If size == -1 then keep
* forwarding until src reaches EOF.
* If dst == -1, data is discarded.
*/
int data_send(int dst, int src, length_t len) {
char *buf;
int i, block;
int c = 0;
int j = 1;
if (!len)
return 1;
buf = new(BLOCK);
do {
block = (len == -1 || len-c > BLOCK ? BLOCK : len-c);
i = read(src, buf, block);
if (i > 0)
c += i;
if (dst >= 0 && debug)
printf("data_send: read %d of %d / %d of %lld (errno = %s)\n", i, block, c, len, i < 0 ? strerror(errno) : "ok");
if (dst >= 0 && so_closed(dst)) {
i = -999;
break;
}
if (dst >= 0 && i > 0) {
j = write(dst, buf, i);
if (debug)
printf("data_send: wrote %d of %d\n", j, i);
}
} while (i > 0 && j > 0 && (len == -1 || c < len));
free(buf);
if (i <= 0 || j <= 0) {
if (i == 0 && j > 0 && (len == -1 || c == len))
return 1;
if (debug)
printf("data_send: fds %d:%d warning %d (connection closed)\n", dst, src, i);
return 0;
}
return 1;
}
/*
* Forward chunked HTTP body from "src" descriptor to "dst".
* If dst == -1, data is discarded.
*/
int chunked_data_send(int dst, int src) {
char *buf;
int bsize, len;
int i, w, csize;
char *err = NULL;
bsize = BUFSIZE;
buf = new(bsize);
/* Take care of all chunks */
do {
i = so_recvln(src, &buf, &bsize);
if (i <= 0) {
if (debug)
printf("chunked_data_send: aborting, read error\n");
free(buf);
return 0;
}
csize = strtol(buf, &err, 16);
if (!isspace(*err) && *err != ';') {
if (debug)
printf("chunked_data_send: aborting, chunk size format error\n");
free(buf);
return 0;
}
if (dst >= 0)
i = write(dst, buf, strlen(buf));
if (csize)
if (!data_send(dst, src, csize+2)) {
if (debug)
printf("chunked_data_send: aborting, data_send failed\n");
free(buf);
return 0;
}
} while (csize != 0);
/* Take care of possible trailer */
w = len = i = 0;
do {
i = so_recvln(src, &buf, &bsize);
if (dst >= 0 && i > 0) {
len = strlen(buf);
w = write(dst, buf, len);
}
} while (w == len && i > 0 && buf[0] != '\r' && buf[0] != '\n');
free(buf);
return 1;
}
/*
* Full-duplex forwarding between proxy and client descriptors.
* Used for bidirectional HTTP CONNECT connection.
*/
int tunnel(int cd, int sd) {
fd_set set;
int from, to, ret, sel;
char *buf;
buf = new(BUFSIZE);
if (debug)
printf("tunnel: select cli: %d, srv: %d\n", cd, sd);
do {
FD_ZERO(&set);
FD_SET(cd, &set);
FD_SET(sd, &set);
sel = select(FD_SETSIZE, &set, NULL, NULL, NULL);
if (sel > 0) {
if (FD_ISSET(cd, &set)) {
from = cd;
to = sd;
} else {
from = sd;
to = cd;
}
ret = read(from, buf, BUFSIZE);
if (ret > 0) {
ret = write(to, buf, ret);
} else {
free(buf);
return (ret == 0);
}
} else if (sel < 0) {
free(buf);
return 0;
}
} while (1);
free(buf);
return 1;
}
/*
* Return 0 if no body, -1 if body until EOF, number if size known
* One of request/response can be NULL
*/
length_t http_has_body(rr_data_t request, rr_data_t response) {
rr_data_t current;
length_t length;
int nobody;
char *tmp;
/*
* Are we checking a complete req+res conversation or just the
* request body?
*/
current = (!response || response->empty ? request : response);
/*
* HTTP body length decisions. There MUST NOT be any body from
* server if the request was HEAD or reply is 1xx, 204 or 304.
* No body can be in GET request if direction is from client.
*/
if (current == response) {
nobody = (HEAD(request) ||
(response->code >= 100 && response->code < 200) ||
response->code == 204 ||
response->code == 304);
} else {
nobody = GET(request) || HEAD(request);
}
/*
* Otherwise consult Content-Length. If present, we forward exaclty
* that many bytes.
*
* If not present, but there is Transfer-Encoding or Content-Type
* (or a request to close connection, that is, end of data is signaled
* by remote close), we will forward until EOF.
*
* No C-L, no T-E, no C-T == no body.
*/
tmp = hlist_get(current->headers, "Content-Length");
if (!nobody && tmp == NULL && (hlist_in(current->headers, "Content-Type")
|| hlist_in(current->headers, "Transfer-Encoding")
|| hlist_subcmp(current->headers, "Connection", "close"))) {
// || (response->code == 200)
if (hlist_in(current->headers, "Transfer-Encoding")
&& hlist_subcmp(current->headers, "Transfer-Encoding", "chunked"))
length = 1;
else
length = -1;
} else
length = (tmp == NULL || nobody ? 0 : atoll(tmp));
if (current == request && length == -1)
length = 0;
return length;
}
/*
* Send a HTTP body (if any) between descriptors readfd and writefd
*/
int http_body_send(int writefd, int readfd, rr_data_t request, rr_data_t response) {
length_t bodylen;
int rc = 1;
rr_data_t current;
/*
* Are we checking a complete req+res conversation or just the
* request body?
*/
current = (response->empty ? request : response);
/*
* Ok, so do we expect any body?
*/
bodylen = http_has_body(request, response);
if (bodylen) {
/*
* Check for supported T-E.
*/
if (hlist_subcmp(current->headers, "Transfer-Encoding", "chunked")) {
if (debug)
printf("Chunked body included.\n");
rc = chunked_data_send(writefd, readfd);
if (debug)
printf(rc ? "Chunked body sent.\n" : "Could not chunk send whole body\n");
} else {
if (debug)
printf("Body included. Length: %lld\n", bodylen);
rc = data_send(writefd, readfd, bodylen);
if (debug)
printf(rc ? "Body sent.\n" : "Could not send whole body\n");
}
} else if (debug)
printf("No body.\n");
return rc;
}
/*
* Connection cleanup - C-L or chunked body
* Return 0 if connection closed or EOF, 1 if OK to continue
*/
int http_body_drop(int fd, rr_data_t response) {
length_t bodylen;
int rc = 1;
bodylen = http_has_body(NULL, response);
if (bodylen) {
if (hlist_subcmp(response->headers, "Transfer-Encoding", "chunked")) {
if (debug)
printf("Discarding chunked body.\n");
rc = chunked_data_send(-1, fd);
} else {
if (debug)
printf("Discarding %lld bytes.\n", bodylen);
rc = data_send(-1, fd, bodylen);
}
}
return rc;
}
/*
* Parse headers for BASIC auth credentials
*
* Return 1 = creds parsed OK, 0 = no creds, -1 = invalid creds
*/
int http_parse_basic(hlist_t headers, const char *header, struct auth_s *tcreds) {
char *tmp = NULL, *pos = NULL, *buf = NULL, *dom = NULL;
int i;
if (!hlist_subcmp(headers, header, "basic"))
return 0;
tmp = hlist_get(headers, header);
buf = new(strlen(tmp) + 1);
i = 5;
while (i < strlen(tmp) && tmp[++i] == ' ');
from_base64(buf, tmp+i);
pos = strchr(buf, ':');
if (pos == NULL) {
memset(buf, 0, strlen(buf)); /* clean password memory */
free(buf);
return -1;
} else {
*pos = 0;
dom = strchr(buf, '\\');
if (dom == NULL) {
auth_strcpy(tcreds, domain, "");
auth_strcpy(tcreds, user, buf);
} else {
*dom = 0;
auth_strcpy(tcreds, domain, buf);
auth_strcpy(tcreds, user, dom+1);
}
if (tcreds->hashntlm2) {
tmp = ntlm2_hash_password(tcreds->user, tcreds->domain, pos+1);
auth_memcpy(tcreds, passntlm2, tmp, 16);
free(tmp);
}
if (tcreds->hashnt) {
tmp = ntlm_hash_nt_password(pos+1);
auth_memcpy(tcreds, passnt, tmp, 21);
free(tmp);
}
if (tcreds->hashlm) {
tmp = ntlm_hash_lm_password(pos+1);
auth_memcpy(tcreds, passlm, tmp, 21);
free(tmp);
}
memset(buf, 0, strlen(buf));
free(buf);
}
return 1;
}