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apache / httpd / 4cdb8a376e350b9430c83fd8321d31080e3e50bd / . / modules / proxy / proxy_ftp.c
blob: ae9030dd19e26d226f467a083f66a88f8134110a [file] [log] [blame]
/* ====================================================================
* Copyright (c) 1996-1999 The Apache Group. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
/* FTP routines for Apache proxy */
#include "mod_proxy.h"
#include "http_main.h"
#include "http_log.h"
#include "http_core.h"
#define AUTODETECT_PWD
DEF_Explain
/*
* Decodes a '%' escaped string, and returns the number of characters
*/
static int decodeenc(char *x)
{
int i, j, ch;
if (x[0] == '\0')
return 0; /* special case for no characters */
for (i = 0, j = 0; x[i] != '\0'; i++, j++) {
/* decode it if not already done */
ch = x[i];
if (ch == '%' && ap_isxdigit(x[i + 1]) && ap_isxdigit(x[i + 2])) {
ch = ap_proxy_hex2c(&x[i + 1]);
i += 2;
}
x[j] = ch;
}
x[j] = '\0';
return j;
}
/*
* checks an encoded ftp string for bad characters, namely, CR, LF or
* non-ascii character
*/
static int ftp_check_string(const char *x)
{
int i, ch;
for (i = 0; x[i] != '\0'; i++) {
ch = x[i];
if (ch == '%' && ap_isxdigit(x[i + 1]) && ap_isxdigit(x[i + 2])) {
ch = ap_proxy_hex2c(&x[i + 1]);
i += 2;
}
#ifndef CHARSET_EBCDIC
if (ch == '\015' || ch == '\012' || (ch & 0x80))
#else /*CHARSET_EBCDIC*/
if (ch == '\r' || ch == '\n' || (os_toascii[ch] & 0x80))
#endif /*CHARSET_EBCDIC*/
return 0;
}
return 1;
}
/*
* Canonicalise ftp URLs.
*/
int ap_proxy_ftp_canon(request_rec *r, char *url)
{
char *user, *password, *host, *path, *parms, *strp, sport[7];
ap_context_t *p = r->pool;
const char *err;
int port;
port = DEFAULT_FTP_PORT;
err = ap_proxy_canon_netloc(p, &url, &user, &password, &host, &port);
if (err)
return HTTP_BAD_REQUEST;
if (user != NULL && !ftp_check_string(user))
return HTTP_BAD_REQUEST;
if (password != NULL && !ftp_check_string(password))
return HTTP_BAD_REQUEST;
/* now parse path/parameters args, according to rfc1738 */
/* N.B. if this isn't a true proxy request, then the URL path
* (but not query args) has already been decoded.
* This gives rise to the problem of a ; being decoded into the
* path.
*/
strp = strchr(url, ';');
if (strp != NULL) {
*(strp++) = '\0';
parms = ap_proxy_canonenc(p, strp, strlen(strp), enc_parm, r->proxyreq);
if (parms == NULL)
return HTTP_BAD_REQUEST;
}
else
parms = "";
path = ap_proxy_canonenc(p, url, strlen(url), enc_path, r->proxyreq);
if (path == NULL)
return HTTP_BAD_REQUEST;
if (!ftp_check_string(path))
return HTTP_BAD_REQUEST;
if (!r->proxyreq && r->args != NULL) {
if (strp != NULL) {
strp = ap_proxy_canonenc(p, r->args, strlen(r->args), enc_parm, 1);
if (strp == NULL)
return HTTP_BAD_REQUEST;
parms = ap_pstrcat(p, parms, "?", strp, NULL);
}
else {
strp = ap_proxy_canonenc(p, r->args, strlen(r->args), enc_fpath, 1);
if (strp == NULL)
return HTTP_BAD_REQUEST;
path = ap_pstrcat(p, path, "?", strp, NULL);
}
r->args = NULL;
}
/* now, rebuild URL */
if (port != DEFAULT_FTP_PORT)
ap_snprintf(sport, sizeof(sport), ":%d", port);
else
sport[0] = '\0';
r->filename = ap_pstrcat(p, "proxy:ftp://", (user != NULL) ? user : "",
(password != NULL) ? ":" : "",
(password != NULL) ? password : "",
(user != NULL) ? "@" : "", host, sport, "/", path,
(parms[0] != '\0') ? ";" : "", parms, NULL);
return OK;
}
/*
* Returns the ftp status code;
* or -1 on I/O error, 0 on data error
*/
static int ftp_getrc(BUFF *f)
{
int len, status;
char linebuff[100], buff[5];
len = ap_bgets(linebuff, sizeof linebuff, f);
if (len == -1)
return -1;
/* check format */
if (len < 5 || !ap_isdigit(linebuff[0]) || !ap_isdigit(linebuff[1]) ||
!ap_isdigit(linebuff[2]) || (linebuff[3] != ' ' && linebuff[3] != '-'))
status = 0;
else
status = 100 * linebuff[0] + 10 * linebuff[1] + linebuff[2] - 111 * '0';
if (linebuff[len - 1] != '\n') {
(void)ap_bskiplf(f);
}
/* skip continuation lines */
if (linebuff[3] == '-') {
memcpy(buff, linebuff, 3);
buff[3] = ' ';
do {
len = ap_bgets(linebuff, sizeof linebuff, f);
if (len == -1)
return -1;
if (linebuff[len - 1] != '\n') {
(void)ap_bskiplf(f);
}
} while (memcmp(linebuff, buff, 4) != 0);
}
return status;
}
/*
* Like ftp_getrc but returns both the ftp status code and
* remembers the response message in the supplied buffer
*/
static int ftp_getrc_msg(BUFF *f, char *msgbuf, int msglen)
{
int len, status;
char linebuff[100], buff[5];
char *mb = msgbuf,
*me = &msgbuf[msglen];
len = ap_bgets(linebuff, sizeof linebuff, f);
if (len == -1)
return -1;
if (len < 5 || !ap_isdigit(linebuff[0]) || !ap_isdigit(linebuff[1]) ||
!ap_isdigit(linebuff[2]) || (linebuff[3] != ' ' && linebuff[3] != '-'))
status = 0;
else
status = 100 * linebuff[0] + 10 * linebuff[1] + linebuff[2] - 111 * '0';
mb = ap_cpystrn(mb, linebuff+4, me - mb);
if (linebuff[len - 1] != '\n')
(void)ap_bskiplf(f);
if (linebuff[3] == '-') {
memcpy(buff, linebuff, 3);
buff[3] = ' ';
do {
len = ap_bgets(linebuff, sizeof linebuff, f);
if (len == -1)
return -1;
if (linebuff[len - 1] != '\n') {
(void)ap_bskiplf(f);
}
mb = ap_cpystrn(mb, linebuff+4, me - mb);
} while (memcmp(linebuff, buff, 4) != 0);
}
return status;
}
static long int send_dir(BUFF *f, request_rec *r, cache_req *c, char *cwd)
{
char buf[IOBUFSIZE];
char buf2[IOBUFSIZE];
char *filename;
int searchidx = 0;
char *searchptr = NULL;
int firstfile = 1;
unsigned long total_bytes_sent = 0;
register int n, o, w;
conn_rec *con = r->connection;
char *dir, *path, *reldir, *site;
/* Save "scheme://site" prefix without password */
site = ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD|UNP_OMITPATHINFO);
/* ... and path without query args */
path = ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITSITEPART|UNP_OMITQUERY);
(void)decodeenc(path);
/* Copy path, strip (all except the last) trailing slashes */
path = dir = ap_pstrcat(r->pool, path, "/", NULL);
while ((n = strlen(path)) > 1 && path[n-1] == '/' && path[n-2] == '/')
path[n-1] = '\0';
/* print "ftp://host/" */
n = ap_snprintf(buf, sizeof(buf), DOCTYPE_HTML_3_2
"<HTML><HEAD><TITLE>%s%s</TITLE>\n"
"<BASE HREF=\"%s%s\"></HEAD>\n"
"<BODY><H2>Directory of "
"<A HREF=\"/\">%s</A>/",
site, path, site, path, site);
total_bytes_sent += ap_proxy_bputs2(buf, con->client, c);
while ((dir = strchr(dir+1, '/')) != NULL)
{
*dir = '\0';
if ((reldir = strrchr(path+1, '/'))==NULL)
reldir = path+1;
else
++reldir;
/* print "path/" component */
ap_snprintf(buf, sizeof(buf), "<A HREF=\"/%s/\">%s</A>/", path+1, reldir);
total_bytes_sent += ap_proxy_bputs2(buf, con->client, c);
*dir = '/';
}
/* If the caller has determined the current directory, and it differs */
/* from what the client requested, then show the real name */
if (cwd == NULL || strncmp (cwd, path, strlen(cwd)) == 0) {
ap_snprintf(buf, sizeof(buf), "</H2>\n<HR><PRE>");
} else {
ap_snprintf(buf, sizeof(buf), "</H2>\n(%s)\n<HR><PRE>", cwd);
}
total_bytes_sent += ap_proxy_bputs2(buf, con->client, c);
while (!con->aborted) {
n = ap_bgets(buf, sizeof buf, f);
if (n == -1) { /* input error */
if (c != NULL) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, c->req,
"proxy: error reading from %s", c->url);
c = ap_proxy_cache_error(c);
}
break;
}
if (n == 0)
break; /* EOF */
if (buf[0] == 'l' && (filename=strstr(buf, " -> ")) != NULL) {
char *link_ptr = filename;
do {
filename--;
} while (filename[0] != ' ');
*(filename++) = '\0';
*(link_ptr++) = '\0';
if ((n = strlen(link_ptr)) > 1 && link_ptr[n - 1] == '\n')
link_ptr[n - 1] = '\0';
ap_snprintf(buf2, sizeof(buf2), "%s <A HREF=\"%s\">%s %s</A>\n", buf, filename, filename, link_ptr);
ap_cpystrn(buf, buf2, sizeof(buf));
n = strlen(buf);
}
else if (buf[0] == 'd' || buf[0] == '-' || buf[0] == 'l' || ap_isdigit(buf[0])) {
if (ap_isdigit(buf[0])) { /* handle DOS dir */
searchptr = strchr(buf, '<');
if (searchptr != NULL)
*searchptr = '[';
searchptr = strchr(buf, '>');
if (searchptr != NULL)
*searchptr = ']';
}
filename = strrchr(buf, ' ');
*(filename++) = 0;
filename[strlen(filename) - 1] = 0;
/* handle filenames with spaces in 'em */
if (!strcmp(filename, ".") || !strcmp(filename, "..") || firstfile) {
firstfile = 0;
searchidx = filename - buf;
}
else if (searchidx != 0 && buf[searchidx] != 0) {
*(--filename) = ' ';
buf[searchidx - 1] = 0;
filename = &buf[searchidx];
}
/* Special handling for '.' and '..' */
if (!strcmp(filename, ".") || !strcmp(filename, "..") || buf[0] == 'd') {
ap_snprintf(buf2, sizeof(buf2), "%s <A HREF=\"%s/\">%s</A>\n",
buf, filename, filename);
}
else {
ap_snprintf(buf2, sizeof(buf2), "%s <A HREF=\"%s\">%s</A>\n", buf, filename, filename);
}
ap_cpystrn(buf, buf2, sizeof(buf));
n = strlen(buf);
}
o = 0;
total_bytes_sent += n;
if (c != NULL && c->fp && ap_bwrite(c->fp, buf, n) != n) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, c->req,
"proxy: error writing to %s", c->tempfile);
c = ap_proxy_cache_error(c);
}
while (n && !r->connection->aborted) {
w = ap_bwrite(con->client, &buf[o], n);
if (w <= 0)
break;
n -= w;
o += w;
}
}
total_bytes_sent += ap_proxy_bputs2("</PRE><HR>\n", con->client, c);
total_bytes_sent += ap_proxy_bputs2(ap_psignature("", r), con->client, c);
total_bytes_sent += ap_proxy_bputs2("</BODY></HTML>\n", con->client, c);
ap_bflush(con->client);
return total_bytes_sent;
}
/* Common routine for failed authorization (i.e., missing or wrong password)
* to an ftp service. This causes most browsers to retry the request
* with username and password (which was presumably queried from the user)
* supplied in the Authorization: header.
* Note that we "invent" a realm name which consists of the
* ftp://user@host part of the reqest (sans password if supplied but invalid-)
*/
static int ftp_unauthorized (request_rec *r, int log_it)
{
r->proxyreq = 0;
/* Log failed requests if they supplied a password
* (log username/password guessing attempts)
*/
if (log_it)
ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, r,
"proxy: missing or failed auth to %s",
ap_unparse_uri_components(r->pool,
&r->parsed_uri, UNP_OMITPATHINFO));
ap_table_setn(r->err_headers_out, "WWW-Authenticate",
ap_pstrcat(r->pool, "Basic realm=\"",
ap_unparse_uri_components(r->pool, &r->parsed_uri,
UNP_OMITPASSWORD|UNP_OMITPATHINFO),
"\"", NULL));
return HTTP_UNAUTHORIZED;
}
/*
* Handles direct access of ftp:// URLs
* Original (Non-PASV) version from
* Troy Morrison <spiffnet@zoom.com>
* PASV added by Chuck
*/
int ap_proxy_ftp_handler(request_rec *r, cache_req *c, char *url)
{
char *host, *path, *strp, *parms;
char *cwd = NULL;
char *user = NULL;
/* char *account = NULL; how to supply an account in a URL? */
const char *password = NULL;
const char *err;
int port, i, j, len, sock, dsock, rc, nocache = 0;
int csd = 0;
struct sockaddr_in server;
struct hostent server_hp;
struct in_addr destaddr;
ap_table_t *resp_hdrs;
BUFF *f;
BUFF *data = NULL;
ap_context_t *p = r->pool;
int one = 1;
const long int zero = 0L;
NET_SIZE_T clen;
struct tbl_do_args tdo;
void *sconf = r->server->module_config;
proxy_server_conf *conf =
(proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
struct noproxy_entry *npent = (struct noproxy_entry *) conf->noproxies->elts;
struct nocache_entry *ncent = (struct nocache_entry *) conf->nocaches->elts;
/* stuff for PASV mode */
unsigned int presult, h0, h1, h2, h3, p0, p1;
unsigned int paddr;
unsigned short pport;
struct sockaddr_in data_addr;
int pasvmode = 0;
char pasv[64];
char *pstr;
/* stuff for responses */
char resp[MAX_STRING_LEN];
char *size = NULL;
/* we only support GET and HEAD */
if (r->method_number != M_GET)
return HTTP_NOT_IMPLEMENTED;
/* We break the URL into host, port, path-search */
host = r->parsed_uri.hostname;
port = (r->parsed_uri.port != 0)
? r->parsed_uri.port
: ap_default_port_for_request(r);
path = ap_pstrdup(p, r->parsed_uri.path);
path = (path != NULL && path[0] != '\0') ? &path[1] : "";
/* The "Authorization:" header must be checked first.
* We allow the user to "override" the URL-coded user [ & password ]
* in the Browsers' User&Password Dialog.
* NOTE that this is only marginally more secure than having the
* password travel in plain as part of the URL, because Basic Auth
* simply uuencodes the plain text password.
* But chances are still smaller that the URL is logged regularly.
*/
if ((password = ap_table_get(r->headers_in, "Authorization")) != NULL
&& strcasecmp(ap_getword(r->pool, &password, ' '), "Basic") == 0
&& (password = ap_pbase64decode(r->pool, password))[0] != ':') {
/* Note that this allocation has to be made from r->connection->pool
* because it has the lifetime of the connection. The other allocations
* are temporary and can be tossed away any time.
*/
user = ap_getword_nulls (r->pool, &password, ':');
r->ap_auth_type = "Basic";
r->user = r->parsed_uri.user = user;
nocache = 1; /* This resource only accessible with username/password */
}
else if ((user = r->parsed_uri.user) != NULL) {
user = ap_pstrdup(p, user);
decodeenc(user);
if ((password = r->parsed_uri.password) != NULL) {
char *tmp = ap_pstrdup(p, password);
decodeenc(tmp);
password = tmp;
}
nocache = 1; /* This resource only accessible with username/password */
}
else {
user = "anonymous";
password = "apache_proxy@";
}
/* check if ProxyBlock directive on this host */
destaddr.s_addr = ap_inet_addr(host);
for (i = 0; i < conf->noproxies->nelts; i++) {
if ((npent[i].name != NULL && strstr(host, npent[i].name) != NULL)
|| destaddr.s_addr == npent[i].addr.s_addr || npent[i].name[0] == '*')
return ap_proxyerror(r, HTTP_FORBIDDEN,
"Connect to remote machine blocked");
}
Explain2("FTP: connect to %s:%d", host, port);
parms = strchr(path, ';');
if (parms != NULL)
*(parms++) = '\0';
memset(&server, 0, sizeof(struct sockaddr_in));
server.sin_family = AF_INET;
server.sin_port = htons(port);
err = ap_proxy_host2addr(host, &server_hp);
if (err != NULL)
return ap_proxyerror(r, HTTP_INTERNAL_SERVER_ERROR, err);
sock = ap_psocket(p, PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy: error creating socket");
return HTTP_INTERNAL_SERVER_ERROR;
}
if (conf->recv_buffer_size > 0
&& setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
(const char *) &conf->recv_buffer_size, sizeof(int))
== -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"setsockopt(SO_RCVBUF): Failed to set ProxyReceiveBufferSize, using default");
}
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &one,
sizeof(one)) == -1) {
#ifndef _OSD_POSIX /* BS2000 has this option "always on" */
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy: error setting reuseaddr option: setsockopt(SO_REUSEADDR)");
ap_pclosesocket(p, sock);
return HTTP_INTERNAL_SERVER_ERROR;
#endif /*_OSD_POSIX*/
}
#ifdef SINIX_D_RESOLVER_BUG
{
struct in_addr *ip_addr = (struct in_addr *) *server_hp.h_addr_list;
for (; ip_addr->s_addr != 0; ++ip_addr) {
memcpy(&server.sin_addr, ip_addr, sizeof(struct in_addr));
i = ap_proxy_doconnect(sock, &server, r);
if (i == 0)
break;
}
}
#else
j = 0;
while (server_hp.h_addr_list[j] != NULL) {
memcpy(&server.sin_addr, server_hp.h_addr_list[j],
sizeof(struct in_addr));
i = ap_proxy_doconnect(sock, &server, r);
if (i == 0)
break;
j++;
}
#endif
if (i == -1) {
ap_pclosesocket(p, sock);
return ap_proxyerror(r, HTTP_BAD_GATEWAY, ap_pstrcat(r->pool,
"Could not connect to remote machine: ",
strerror(errno), NULL));
}
f = ap_bcreate(p, B_RDWR | B_SOCKET);
ap_bpushfd(f, sock);
/* shouldn't we implement telnet control options here? */
#ifdef CHARSET_EBCDIC
ap_bsetflag(f, B_ASCII2EBCDIC|B_EBCDIC2ASCII, 1);
#endif /*CHARSET_EBCDIC*/
/* possible results: */
/* 120 Service ready in nnn minutes. */
/* 220 Service ready for new user. */
/* 421 Service not available, closing control connection. */
i = ftp_getrc_msg(f, resp, sizeof resp);
Explain1("FTP: returned status %d", i);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
#if 0
if (i == 120) {
/* RFC2068 states:
* 14.38 Retry-After
*
* The Retry-After response-header field can be used with a 503 (Service
* Unavailable) response to indicate how long the service is expected to
* be unavailable to the requesting client. The value of this field can
* be either an HTTP-date or an integer number of seconds (in decimal)
* after the time of the response.
* Retry-After = "Retry-After" ":" ( HTTP-date | delta-seconds )
*/
ap_set_header("Retry-After", ap_psprintf(p, "%u", 60*wait_mins);
return ap_proxyerror(r, HTTP_SERVICE_UNAVAILABLE, resp);
}
#endif
if (i != 220) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, resp);
}
Explain0("FTP: connected.");
ap_bvputs(f, "USER ", user, CRLF, NULL);
ap_bflush(f); /* capture any errors */
Explain1("FTP: USER %s", user);
/* possible results; 230, 331, 332, 421, 500, 501, 530 */
/* states: 1 - error, 2 - success; 3 - send password, 4,5 fail */
/* 230 User logged in, proceed. */
/* 331 User name okay, need password. */
/* 332 Need account for login. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* (This may include errors such as command line too long.) */
/* 501 Syntax error in parameters or arguments. */
/* 530 Not logged in. */
i = ftp_getrc(f);
Explain1("FTP: returned status %d", i);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 530) {
return ftp_unauthorized (r, 1); /* log it: user name guessing attempt? */
}
if (i != 230 && i != 331) {
return HTTP_BAD_GATEWAY;
}
if (i == 331) { /* send password */
if (password == NULL) {
return ftp_unauthorized (r, 0);
}
ap_bvputs(f, "PASS ", password, CRLF, NULL);
ap_bflush(f);
Explain1("FTP: PASS %s", password);
/* possible results 202, 230, 332, 421, 500, 501, 503, 530 */
/* 230 User logged in, proceed. */
/* 332 Need account for login. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 503 Bad sequence of commands. */
/* 530 Not logged in. */
i = ftp_getrc(f);
Explain1("FTP: returned status %d", i);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY, "Error reading from remote server");
}
if (i == 332) {
return ap_proxyerror(r, HTTP_UNAUTHORIZED, "Need account for login");
}
/* @@@ questionable -- we might as well return a 403 Forbidden here */
if (i == 530) {
return ftp_unauthorized (r, 1); /* log it: passwd guessing attempt? */
}
if (i != 230 && i != 202) {
return HTTP_BAD_GATEWAY;
}
}
/* set the directory (walk directory component by component):
* this is what we must do if we don't know the OS type of the remote
* machine
*/
for (;;) {
strp = strchr(path, '/');
if (strp == NULL)
break;
*strp = '\0';
len = decodeenc(path);
ap_bvputs(f, "CWD ", path, CRLF, NULL);
ap_bflush(f);
Explain1("FTP: CWD %s", path);
*strp = '/';
/* responses: 250, 421, 500, 501, 502, 530, 550 */
/* 250 Requested file action okay, completed. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
/* 550 Requested action not taken. */
i = ftp_getrc(f);
Explain1("FTP: returned status %d", i);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 550) {
return HTTP_NOT_FOUND;
}
if (i != 250) {
return HTTP_BAD_GATEWAY;
}
path = strp + 1;
}
if (parms != NULL && strncmp(parms, "type=", 5) == 0) {
parms += 5;
if ((parms[0] != 'd' && parms[0] != 'a' && parms[0] != 'i') ||
parms[1] != '\0')
parms = "";
}
else
parms = "";
/* changed to make binary transfers the default */
if (parms[0] != 'a') {
/* set type to image */
/* TM - Added \015\012 to the end of TYPE I, otherwise it hangs the
connection */
ap_bputs("TYPE I" CRLF, f);
ap_bflush(f);
Explain0("FTP: TYPE I");
/* responses: 200, 421, 500, 501, 504, 530 */
/* 200 Command okay. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 504 Command not implemented for that parameter. */
/* 530 Not logged in. */
i = ftp_getrc(f);
Explain1("FTP: returned status %d", i);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i != 200 && i != 504) {
return HTTP_BAD_GATEWAY;
}
/* Allow not implemented */
if (i == 504)
parms[0] = '\0';
}
/* try to set up PASV data connection first */
dsock = ap_psocket(p, PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (dsock == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy: error creating PASV socket");
ap_bclose(f);
return HTTP_INTERNAL_SERVER_ERROR;
}
if (conf->recv_buffer_size) {
if (setsockopt(dsock, SOL_SOCKET, SO_RCVBUF,
(const char *) &conf->recv_buffer_size, sizeof(int)) == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"setsockopt(SO_RCVBUF): Failed to set ProxyReceiveBufferSize, using default");
}
}
ap_bputs("PASV" CRLF, f);
ap_bflush(f);
Explain0("FTP: PASV command issued");
/* possible results: 227, 421, 500, 501, 502, 530 */
/* 227 Entering Passive Mode (h1,h2,h3,h4,p1,p2). */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
i = ap_bgets(pasv, sizeof(pasv), f);
if (i == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, r,
"PASV: control connection is toast");
ap_pclosesocket(p, dsock);
ap_bclose(f);
return HTTP_INTERNAL_SERVER_ERROR;
}
else {
pasv[i - 1] = '\0';
pstr = strtok(pasv, " "); /* separate result code */
if (pstr != NULL) {
presult = atoi(pstr);
if (*(pstr + strlen(pstr) + 1) == '=')
pstr += strlen(pstr) + 2;
else
{
pstr = strtok(NULL, "("); /* separate address & port params */
if (pstr != NULL)
pstr = strtok(NULL, ")");
}
}
else
presult = atoi(pasv);
Explain1("FTP: returned status %d", presult);
if (presult == 227 && pstr != NULL && (sscanf(pstr,
"%d,%d,%d,%d,%d,%d", &h3, &h2, &h1, &h0, &p1, &p0) == 6)) {
/* pardon the parens, but it makes gcc happy */
paddr = (((((h3 << 8) + h2) << 8) + h1) << 8) + h0;
pport = (p1 << 8) + p0;
Explain5("FTP: contacting host %d.%d.%d.%d:%d",
h3, h2, h1, h0, pport);
data_addr.sin_family = AF_INET;
data_addr.sin_addr.s_addr = htonl(paddr);
data_addr.sin_port = htons(pport);
i = ap_proxy_doconnect(dsock, &data_addr, r);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
ap_pstrcat(r->pool,
"Could not connect to remote machine: ",
strerror(errno), NULL));
}
else {
pasvmode = 1;
}
}
else
ap_pclosesocket(p, dsock); /* and try the regular way */
}
if (!pasvmode) { /* set up data connection */
clen = sizeof(struct sockaddr_in);
if (getsockname(sock, (struct sockaddr *) &server, &clen) < 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy: error getting socket address");
ap_bclose(f);
return HTTP_INTERNAL_SERVER_ERROR;
}
dsock = ap_psocket(p, PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (dsock == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy: error creating socket");
ap_bclose(f);
return HTTP_INTERNAL_SERVER_ERROR;
}
if (setsockopt(dsock, SOL_SOCKET, SO_REUSEADDR, (void *) &one,
sizeof(one)) == -1) {
#ifndef _OSD_POSIX /* BS2000 has this option "always on" */
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy: error setting reuseaddr option");
ap_pclosesocket(p, dsock);
ap_bclose(f);
return HTTP_INTERNAL_SERVER_ERROR;
#endif /*_OSD_POSIX*/
}
if (bind(dsock, (struct sockaddr *) &server,
sizeof(struct sockaddr_in)) == -1) {
char buff[22];
ap_snprintf(buff, sizeof(buff), "%s:%d", inet_ntoa(server.sin_addr), server.sin_port);
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy: error binding to ftp data socket %s", buff);
ap_bclose(f);
ap_pclosesocket(p, dsock);
return HTTP_INTERNAL_SERVER_ERROR;
}
listen(dsock, 2); /* only need a short queue */
}
/* set request; "path" holds last path component */
len = decodeenc(path);
/* TM - if len == 0 then it must be a directory (you can't RETR nothing) */
if (len == 0) {
parms = "d";
}
else {
ap_bvputs(f, "SIZE ", path, CRLF, NULL);
ap_bflush(f);
Explain1("FTP: SIZE %s", path);
i = ftp_getrc_msg(f, resp, sizeof resp);
Explain2("FTP: returned status %d with response %s", i, resp);
if (i != 500) { /* Size command not recognized */
if (i == 550) { /* Not a regular file */
Explain0("FTP: SIZE shows this is a directory");
parms = "d";
ap_bvputs(f, "CWD ", path, CRLF, NULL);
ap_bflush(f);
Explain1("FTP: CWD %s", path);
i = ftp_getrc(f);
/* possible results: 250, 421, 500, 501, 502, 530, 550 */
/* 250 Requested file action okay, completed. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
/* 550 Requested action not taken. */
Explain1("FTP: returned status %d", i);
if (i == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 550) {
return HTTP_NOT_FOUND;
}
if (i != 250) {
return HTTP_BAD_GATEWAY;
}
path = "";
len = 0;
}
else if (i == 213) { /* Size command ok */
for (j = 0; j < sizeof resp && ap_isdigit(resp[j]); j++)
;
resp[j] = '\0';
if (resp[0] != '\0')
size = ap_pstrdup(p, resp);
}
}
}
#ifdef AUTODETECT_PWD
ap_bvputs(f, "PWD", CRLF, NULL);
ap_bflush(f);
Explain0("FTP: PWD");
/* responses: 257, 500, 501, 502, 421, 550 */
/* 257 "<directory-name>" <commentary> */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 550 Requested action not taken. */
i = ftp_getrc_msg(f, resp, sizeof resp);
Explain1("FTP: PWD returned status %d", i);
if (i == -1 || i == 421) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 550) {
return HTTP_NOT_FOUND;
}
if (i == 257) {
const char *dirp = resp;
cwd = ap_getword_conf(r->pool, &dirp);
}
#endif /*AUTODETECT_PWD*/
if (parms[0] == 'd') {
if (len != 0)
ap_bvputs(f, "LIST ", path, CRLF, NULL);
else
ap_bputs("LIST -lag" CRLF, f);
Explain1("FTP: LIST %s", (len == 0 ? "" : path));
}
else {
ap_bvputs(f, "RETR ", path, CRLF, NULL);
Explain1("FTP: RETR %s", path);
}
ap_bflush(f);
/* RETR: 110, 125, 150, 226, 250, 421, 425, 426, 450, 451, 500, 501, 530, 550
NLST: 125, 150, 226, 250, 421, 425, 426, 450, 451, 500, 501, 502, 530 */
/* 110 Restart marker reply. */
/* 125 Data connection already open; transfer starting. */
/* 150 File status okay; about to open data connection. */
/* 226 Closing data connection. */
/* 250 Requested file action okay, completed. */
/* 421 Service not available, closing control connection. */
/* 425 Can't open data connection. */
/* 426 Connection closed; transfer aborted. */
/* 450 Requested file action not taken. */
/* 451 Requested action aborted. Local error in processing. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 530 Not logged in. */
/* 550 Requested action not taken. */
rc = ftp_getrc(f);
Explain1("FTP: returned status %d", rc);
if (rc == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (rc == 550) {
Explain0("FTP: RETR failed, trying LIST instead");
parms = "d";
ap_bvputs(f, "CWD ", path, CRLF, NULL);
ap_bflush(f);
Explain1("FTP: CWD %s", path);
/* possible results: 250, 421, 500, 501, 502, 530, 550 */
/* 250 Requested file action okay, completed. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 530 Not logged in. */
/* 550 Requested action not taken. */
rc = ftp_getrc(f);
Explain1("FTP: returned status %d", rc);
if (rc == -1) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (rc == 550) {
return HTTP_NOT_FOUND;
}
if (rc != 250) {
return HTTP_BAD_GATEWAY;
}
#ifdef AUTODETECT_PWD
ap_bvputs(f, "PWD", CRLF, NULL);
ap_bflush(f);
Explain0("FTP: PWD");
/* responses: 257, 500, 501, 502, 421, 550 */
/* 257 "<directory-name>" <commentary> */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
/* 550 Requested action not taken. */
i = ftp_getrc_msg(f, resp, sizeof resp);
Explain1("FTP: PWD returned status %d", i);
if (i == -1 || i == 421) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (i == 550) {
return HTTP_NOT_FOUND;
}
if (i == 257) {
const char *dirp = resp;
cwd = ap_getword_conf(r->pool, &dirp);
}
#endif /*AUTODETECT_PWD*/
ap_bputs("LIST -lag" CRLF, f);
ap_bflush(f);
Explain0("FTP: LIST -lag");
rc = ftp_getrc(f);
Explain1("FTP: returned status %d", rc);
if (rc == -1)
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
"Error reading from remote server");
}
if (rc != 125 && rc != 150 && rc != 226 && rc != 250)
return HTTP_BAD_GATEWAY;
r->status = HTTP_OK;
r->status_line = "200 OK";
resp_hdrs = ap_make_table(p, 2);
c->hdrs = resp_hdrs;
ap_table_setn(resp_hdrs, "Date", ap_gm_timestr_822(r->pool, r->request_time));
ap_table_setn(resp_hdrs, "Server", ap_get_server_version());
if (parms[0] == 'd')
ap_table_setn(resp_hdrs, "Content-Type", "text/html");
else {
if (r->content_type != NULL) {
ap_table_setn(resp_hdrs, "Content-Type", r->content_type);
Explain1("FTP: Content-Type set to %s", r->content_type);
}
else {
ap_table_setn(resp_hdrs, "Content-Type", ap_default_type(r));
}
if (parms[0] != 'a' && size != NULL) {
/* We "trust" the ftp server to really serve (size) bytes... */
ap_table_set(resp_hdrs, "Content-Length", size);
Explain1("FTP: Content-Length set to %s", size);
}
}
if (r->content_encoding != NULL && r->content_encoding[0] != '\0') {
Explain1("FTP: Content-Encoding set to %s", r->content_encoding);
ap_table_setn(resp_hdrs, "Content-Encoding", r->content_encoding);
}
/* check if NoCache directive on this host */
for (i = 0; i < conf->nocaches->nelts; i++) {
if ((ncent[i].name != NULL && strstr(host, ncent[i].name) != NULL)
|| destaddr.s_addr == ncent[i].addr.s_addr || ncent[i].name[0] == '*')
nocache = 1;
}
i = ap_proxy_cache_update(c, resp_hdrs, 0, nocache);
if (i != DECLINED) {
ap_pclosesocket(p, dsock);
ap_bclose(f);
return i;
}
if (!pasvmode) { /* wait for connection */
clen = sizeof(struct sockaddr_in);
do
csd = accept(dsock, (struct sockaddr *) &server, &clen);
while (csd == -1 && errno == EINTR);
if (csd == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy: failed to accept data connection");
ap_pclosesocket(p, dsock);
ap_bclose(f);
if (c != NULL)
c = ap_proxy_cache_error(c);
return HTTP_BAD_GATEWAY;
}
ap_note_cleanups_for_socket(p, csd);
data = ap_bcreate(p, B_RDWR | B_SOCKET);
ap_bpushfd(data, csd);
}
else {
data = ap_bcreate(p, B_RDWR | B_SOCKET);
ap_bpushfd(data, dsock);
}
/* send response */
/* write status line */
if (!r->assbackwards)
ap_rvputs(r, "HTTP/1.0 ", r->status_line, CRLF, NULL);
if (c != NULL && c->fp != NULL
&& ap_bvputs(c->fp, "HTTP/1.0 ", r->status_line, CRLF, NULL) == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, c->req,
"proxy: error writing CRLF to %s", c->tempfile);
c = ap_proxy_cache_error(c);
}
/* send headers */
tdo.req = r;
tdo.cache = c;
ap_table_do(ap_proxy_send_hdr_line, &tdo, resp_hdrs, NULL);
if (!r->assbackwards)
ap_rputs(CRLF, r);
if (c != NULL && c->fp != NULL && ap_bputs(CRLF, c->fp) == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, c->req,
"proxy: error writing CRLF to %s", c->tempfile);
c = ap_proxy_cache_error(c);
}
ap_bsetopt(r->connection->client, BO_BYTECT, &zero);
r->sent_bodyct = 1;
/* send body */
if (!r->header_only) {
if (parms[0] != 'd') {
/* we need to set this for ap_proxy_send_fb()... */
if (c != NULL)
c->cache_completion = 0;
ap_proxy_send_fb(data, r, c);
} else
send_dir(data, r, c, cwd);
if (rc == 125 || rc == 150)
rc = ftp_getrc(f);
/* XXX: we checked for 125||150||226||250 above. This is redundant. */
if (rc != 226 && rc != 250)
/* XXX: we no longer log an "error writing to c->tempfile" - should we? */
c = ap_proxy_cache_error(c);
}
else {
/* abort the transfer */
ap_bputs("ABOR" CRLF, f);
ap_bflush(f);
if (!pasvmode)
ap_bclose(data);
Explain0("FTP: ABOR");
/* responses: 225, 226, 421, 500, 501, 502 */
/* 225 Data connection open; no transfer in progress. */
/* 226 Closing data connection. */
/* 421 Service not available, closing control connection. */
/* 500 Syntax error, command unrecognized. */
/* 501 Syntax error in parameters or arguments. */
/* 502 Command not implemented. */
i = ftp_getrc(f);
Explain1("FTP: returned status %d", i);
}
ap_proxy_cache_tidy(c);
/* finish */
ap_bputs("QUIT" CRLF, f);
ap_bflush(f);
Explain0("FTP: QUIT");
/* responses: 221, 500 */
/* 221 Service closing control connection. */
/* 500 Syntax error, command unrecognized. */
i = ftp_getrc(f);
Explain1("FTP: QUIT: status %d", i);
if (pasvmode)
ap_bclose(data);
ap_bclose(f);
ap_rflush(r); /* flush before garbage collection */
ap_proxy_garbage_coll(r);
return OK;
}