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client.c
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client.c
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/*
* Client routines for the CUPS scheduler.
*
* Copyright © 2007-2018 by Apple Inc.
* Copyright © 1997-2007 by Easy Software Products, all rights reserved.
*
* This file contains Kerberos support code, copyright 2006 by
* Jelmer Vernooij.
*
* These coded instructions, statements, and computer programs are the
* property of Apple Inc. and are protected by Federal copyright
* law. Distribution and use rights are outlined in the file "LICENSE.txt"
* which should have been included with this file. If this file is
* missing or damaged, see the license at "http://www.cups.org/".
*/
/*
* Include necessary headers...
*/
#define _CUPS_NO_DEPRECATED
#define _HTTP_NO_PRIVATE
#include "cupsd.h"
#ifdef __APPLE__
# include <libproc.h>
#endif /* __APPLE__ */
#ifdef HAVE_TCPD_H
# include <tcpd.h>
#endif /* HAVE_TCPD_H */
/*
* Local functions...
*/
static int check_if_modified(cupsd_client_t *con,
struct stat *filestats);
static int compare_clients(cupsd_client_t *a, cupsd_client_t *b,
void *data);
#ifdef HAVE_SSL
static int cupsd_start_tls(cupsd_client_t *con, http_encryption_t e);
#endif /* HAVE_SSL */
static char *get_file(cupsd_client_t *con, struct stat *filestats,
char *filename, size_t len);
static http_status_t install_cupsd_conf(cupsd_client_t *con);
static int is_cgi(cupsd_client_t *con, const char *filename,
struct stat *filestats, mime_type_t *type);
static int is_path_absolute(const char *path);
static int pipe_command(cupsd_client_t *con, int infile, int *outfile,
char *command, char *options, int root);
static int valid_host(cupsd_client_t *con);
static int write_file(cupsd_client_t *con, http_status_t code,
char *filename, char *type,
struct stat *filestats);
static void write_pipe(cupsd_client_t *con);
/*
* 'cupsdAcceptClient()' - Accept a new client.
*/
void
cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
{
const char *hostname; /* Hostname of client */
char name[256]; /* Hostname of client */
int count; /* Count of connections on a host */
cupsd_client_t *con, /* New client pointer */
*tempcon; /* Temporary client pointer */
socklen_t addrlen; /* Length of address */
http_addr_t temp; /* Temporary address variable */
static time_t last_dos = 0; /* Time of last DoS attack */
#ifdef HAVE_TCPD_H
struct request_info wrap_req; /* TCP wrappers request information */
#endif /* HAVE_TCPD_H */
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAcceptClient(lis=%p(%d)) Clients=%d", lis, lis->fd, cupsArrayCount(Clients));
/*
* Make sure we don't have a full set of clients already...
*/
if (cupsArrayCount(Clients) == MaxClients)
return;
cupsdSetBusyState(1);
/*
* Get a pointer to the next available client...
*/
if (!Clients)
Clients = cupsArrayNew(NULL, NULL);
if (!Clients)
{
cupsdLogMessage(CUPSD_LOG_ERROR,
"Unable to allocate memory for clients array!");
cupsdPauseListening();
return;
}
if (!ActiveClients)
ActiveClients = cupsArrayNew((cups_array_func_t)compare_clients, NULL);
if (!ActiveClients)
{
cupsdLogMessage(CUPSD_LOG_ERROR,
"Unable to allocate memory for active clients array!");
cupsdPauseListening();
return;
}
if ((con = calloc(1, sizeof(cupsd_client_t))) == NULL)
{
cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to allocate memory for client!");
cupsdPauseListening();
return;
}
/*
* Accept the client and get the remote address...
*/
con->number = ++ LastClientNumber;
con->file = -1;
if ((con->http = httpAcceptConnection(lis->fd, 0)) == NULL)
{
if (errno == ENFILE || errno == EMFILE)
cupsdPauseListening();
cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to accept client connection - %s.",
strerror(errno));
free(con);
return;
}
/*
* Save the connected address and port number...
*/
addrlen = sizeof(con->clientaddr);
if (getsockname(httpGetFd(con->http), (struct sockaddr *)&con->clientaddr, &addrlen) || addrlen == 0)
con->clientaddr = lis->address;
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Server address is \"%s\".", httpAddrString(&con->clientaddr, name, sizeof(name)));
/*
* Check the number of clients on the same address...
*/
for (count = 0, tempcon = (cupsd_client_t *)cupsArrayFirst(Clients);
tempcon;
tempcon = (cupsd_client_t *)cupsArrayNext(Clients))
if (httpAddrEqual(httpGetAddress(tempcon->http), httpGetAddress(con->http)))
{
count ++;
if (count >= MaxClientsPerHost)
break;
}
if (count >= MaxClientsPerHost)
{
if ((time(NULL) - last_dos) >= 60)
{
last_dos = time(NULL);
cupsdLogMessage(CUPSD_LOG_WARN,
"Possible DoS attack - more than %d clients connecting "
"from %s.",
MaxClientsPerHost,
httpGetHostname(con->http, name, sizeof(name)));
}
httpClose(con->http);
free(con);
return;
}
/*
* Get the hostname or format the IP address as needed...
*/
if (HostNameLookups)
hostname = httpResolveHostname(con->http, NULL, 0);
else
hostname = httpGetHostname(con->http, NULL, 0);
if (hostname == NULL && HostNameLookups == 2)
{
/*
* Can't have an unresolved IP address with double-lookups enabled...
*/
httpClose(con->http);
cupsdLogClient(con, CUPSD_LOG_WARN,
"Name lookup failed - connection from %s closed!",
httpGetHostname(con->http, NULL, 0));
free(con);
return;
}
if (HostNameLookups == 2)
{
/*
* Do double lookups as needed...
*/
http_addrlist_t *addrlist, /* List of addresses */
*addr; /* Current address */
if ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, NULL)) != NULL)
{
/*
* See if the hostname maps to the same IP address...
*/
for (addr = addrlist; addr; addr = addr->next)
if (httpAddrEqual(httpGetAddress(con->http), &(addr->addr)))
break;
}
else
addr = NULL;
httpAddrFreeList(addrlist);
if (!addr)
{
/*
* Can't have a hostname that doesn't resolve to the same IP address
* with double-lookups enabled...
*/
httpClose(con->http);
cupsdLogClient(con, CUPSD_LOG_WARN,
"IP lookup failed - connection from %s closed!",
httpGetHostname(con->http, NULL, 0));
free(con);
return;
}
}
#ifdef HAVE_TCPD_H
/*
* See if the connection is denied by TCP wrappers...
*/
request_init(&wrap_req, RQ_DAEMON, "cupsd", RQ_FILE, httpGetFd(con->http),
NULL);
fromhost(&wrap_req);
if (!hosts_access(&wrap_req))
{
httpClose(con->http);
cupsdLogClient(con, CUPSD_LOG_WARN,
"Connection from %s refused by /etc/hosts.allow and "
"/etc/hosts.deny rules.", httpGetHostname(con->http, NULL, 0));
free(con);
return;
}
#endif /* HAVE_TCPD_H */
#ifdef AF_LOCAL
if (httpAddrFamily(httpGetAddress(con->http)) == AF_LOCAL)
{
# ifdef __APPLE__
socklen_t peersize; /* Size of peer credentials */
pid_t peerpid; /* Peer process ID */
char peername[256]; /* Name of process */
peersize = sizeof(peerpid);
if (!getsockopt(httpGetFd(con->http), SOL_LOCAL, LOCAL_PEERPID, &peerpid,
&peersize))
{
if (!proc_name((int)peerpid, peername, sizeof(peername)))
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Accepted from %s (Domain ???[%d])",
httpGetHostname(con->http, NULL, 0), (int)peerpid);
else
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Accepted from %s (Domain %s[%d])",
httpGetHostname(con->http, NULL, 0), peername, (int)peerpid);
}
else
# endif /* __APPLE__ */
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Accepted from %s (Domain)",
httpGetHostname(con->http, NULL, 0));
}
else
#endif /* AF_LOCAL */
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Accepted from %s:%d (IPv%d)",
httpGetHostname(con->http, NULL, 0),
httpAddrPort(httpGetAddress(con->http)),
httpAddrFamily(httpGetAddress(con->http)) == AF_INET ? 4 : 6);
/*
* Get the local address the client connected to...
*/
addrlen = sizeof(temp);
if (getsockname(httpGetFd(con->http), (struct sockaddr *)&temp, &addrlen))
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to get local address - %s",
strerror(errno));
strlcpy(con->servername, "localhost", sizeof(con->servername));
con->serverport = LocalPort;
}
#ifdef AF_LOCAL
else if (httpAddrFamily(&temp) == AF_LOCAL)
{
strlcpy(con->servername, "localhost", sizeof(con->servername));
con->serverport = LocalPort;
}
#endif /* AF_LOCAL */
else
{
if (httpAddrLocalhost(&temp))
strlcpy(con->servername, "localhost", sizeof(con->servername));
else if (HostNameLookups)
httpAddrLookup(&temp, con->servername, sizeof(con->servername));
else
httpAddrString(&temp, con->servername, sizeof(con->servername));
con->serverport = httpAddrPort(&(lis->address));
}
/*
* Add the connection to the array of active clients...
*/
cupsArrayAdd(Clients, con);
/*
* Add the socket to the server select.
*/
cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient, NULL,
con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for request.");
/*
* Temporarily suspend accept()'s until we lose a client...
*/
if (cupsArrayCount(Clients) == MaxClients)
cupsdPauseListening();
#ifdef HAVE_SSL
/*
* See if we are connecting on a secure port...
*/
if (lis->encryption == HTTP_ENCRYPTION_ALWAYS)
{
/*
* https connection; go secure...
*/
if (cupsd_start_tls(con, HTTP_ENCRYPTION_ALWAYS))
cupsdCloseClient(con);
}
else
con->auto_ssl = 1;
#endif /* HAVE_SSL */
}
/*
* 'cupsdCloseAllClients()' - Close all remote clients immediately.
*/
void
cupsdCloseAllClients(void)
{
cupsd_client_t *con; /* Current client */
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCloseAllClients() Clients=%d", cupsArrayCount(Clients));
for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
con;
con = (cupsd_client_t *)cupsArrayNext(Clients))
if (cupsdCloseClient(con))
cupsdCloseClient(con);
}
/*
* 'cupsdCloseClient()' - Close a remote client.
*/
int /* O - 1 if partial close, 0 if fully closed */
cupsdCloseClient(cupsd_client_t *con) /* I - Client to close */
{
int partial; /* Do partial close for SSL? */
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing connection.");
/*
* Flush pending writes before closing...
*/
httpFlushWrite(con->http);
partial = 0;
if (con->pipe_pid != 0)
{
/*
* Stop any CGI process...
*/
cupsdEndProcess(con->pipe_pid, 1);
con->pipe_pid = 0;
}
if (con->file >= 0)
{
cupsdRemoveSelect(con->file);
close(con->file);
con->file = -1;
}
/*
* Close the socket and clear the file from the input set for select()...
*/
if (httpGetFd(con->http) >= 0)
{
cupsArrayRemove(ActiveClients, con);
cupsdSetBusyState(0);
#ifdef HAVE_SSL
/*
* Shutdown encryption as needed...
*/
if (httpIsEncrypted(con->http))
partial = 1;
#endif /* HAVE_SSL */
if (partial)
{
/*
* Only do a partial close so that the encrypted client gets everything.
*/
httpShutdown(con->http);
cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient,
NULL, con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for socket close.");
}
else
{
/*
* Shut the socket down fully...
*/
cupsdRemoveSelect(httpGetFd(con->http));
httpClose(con->http);
con->http = NULL;
}
}
if (!partial)
{
/*
* Free memory...
*/
cupsdRemoveSelect(httpGetFd(con->http));
httpClose(con->http);
if (con->filename)
{
unlink(con->filename);
cupsdClearString(&con->filename);
}
cupsdClearString(&con->command);
cupsdClearString(&con->options);
cupsdClearString(&con->query_string);
if (con->request)
{
ippDelete(con->request);
con->request = NULL;
}
if (con->response)
{
ippDelete(con->response);
con->response = NULL;
}
if (con->language)
{
cupsLangFree(con->language);
con->language = NULL;
}
#ifdef HAVE_AUTHORIZATION_H
if (con->authref)
{
AuthorizationFree(con->authref, kAuthorizationFlagDefaults);
con->authref = NULL;
}
#endif /* HAVE_AUTHORIZATION_H */
/*
* Re-enable new client connections if we are going back under the
* limit...
*/
if (cupsArrayCount(Clients) == MaxClients)
cupsdResumeListening();
/*
* Compact the list of clients as necessary...
*/
cupsArrayRemove(Clients, con);
free(con);
}
return (partial);
}
/*
* 'cupsdReadClient()' - Read data from a client.
*/
void
cupsdReadClient(cupsd_client_t *con) /* I - Client to read from */
{
char line[32768], /* Line from client... */
locale[64], /* Locale */
*ptr; /* Pointer into strings */
http_status_t status; /* Transfer status */
ipp_state_t ipp_state; /* State of IPP transfer */
int bytes; /* Number of bytes to POST */
char *filename; /* Name of file for GET/HEAD */
char buf[1024]; /* Buffer for real filename */
struct stat filestats; /* File information */
mime_type_t *type; /* MIME type of file */
cupsd_printer_t *p; /* Printer */
static unsigned request_id = 0; /* Request ID for temp files */
status = HTTP_STATUS_CONTINUE;
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdReadClient: error=%d, used=%d, state=%s, data_encoding=HTTP_ENCODING_%s, data_remaining=" CUPS_LLFMT ", request=%p(%s), file=%d", httpError(con->http), (int)httpGetReady(con->http), httpStateString(httpGetState(con->http)), httpIsChunked(con->http) ? "CHUNKED" : "LENGTH", CUPS_LLCAST httpGetRemaining(con->http), con->request, con->request ? ippStateString(ippGetState(con->request)) : "", con->file);
if (httpError(con->http) == EPIPE && !httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
{
/*
* Connection closed...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
cupsdCloseClient(con);
return;
}
if (httpGetState(con->http) == HTTP_STATE_GET_SEND ||
httpGetState(con->http) == HTTP_STATE_POST_SEND ||
httpGetState(con->http) == HTTP_STATE_STATUS)
{
/*
* If we get called in the wrong state, then something went wrong with the
* connection and we need to shut it down...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on unexpected HTTP read state %s.", httpStateString(httpGetState(con->http)));
cupsdCloseClient(con);
return;
}
#ifdef HAVE_SSL
if (con->auto_ssl)
{
/*
* Automatically check for a SSL/TLS handshake...
*/
con->auto_ssl = 0;
if (recv(httpGetFd(con->http), buf, 1, MSG_PEEK) == 1 &&
(!buf[0] || !strchr("DGHOPT", buf[0])))
{
/*
* Encrypt this connection...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "Saw first byte %02X, auto-negotiating SSL/TLS session.", buf[0] & 255);
if (cupsd_start_tls(con, HTTP_ENCRYPTION_ALWAYS))
cupsdCloseClient(con);
return;
}
}
#endif /* HAVE_SSL */
switch (httpGetState(con->http))
{
case HTTP_STATE_WAITING :
/*
* See if we've received a request line...
*/
con->operation = httpReadRequest(con->http, con->uri, sizeof(con->uri));
if (con->operation == HTTP_STATE_ERROR ||
con->operation == HTTP_STATE_UNKNOWN_METHOD ||
con->operation == HTTP_STATE_UNKNOWN_VERSION)
{
if (httpError(con->http))
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"HTTP_STATE_WAITING Closing for error %d (%s)",
httpError(con->http), strerror(httpError(con->http)));
else
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"HTTP_STATE_WAITING Closing on error: %s",
cupsLastErrorString());
cupsdCloseClient(con);
return;
}
/*
* Ignore blank request lines...
*/
if (con->operation == HTTP_STATE_WAITING)
break;
/*
* Clear other state variables...
*/
con->bytes = 0;
con->file = -1;
con->file_ready = 0;
con->pipe_pid = 0;
con->username[0] = '\0';
con->password[0] = '\0';
cupsdClearString(&con->command);
cupsdClearString(&con->options);
cupsdClearString(&con->query_string);
if (con->request)
{
ippDelete(con->request);
con->request = NULL;
}
if (con->response)
{
ippDelete(con->response);
con->response = NULL;
}
if (con->language)
{
cupsLangFree(con->language);
con->language = NULL;
}
#ifdef HAVE_GSSAPI
con->have_gss = 0;
con->gss_uid = 0;
#endif /* HAVE_GSSAPI */
/*
* Handle full URLs in the request line...
*/
if (strcmp(con->uri, "*"))
{
char scheme[HTTP_MAX_URI], /* Method/scheme */
userpass[HTTP_MAX_URI], /* Username:password */
hostname[HTTP_MAX_URI], /* Hostname */
resource[HTTP_MAX_URI]; /* Resource path */
int port; /* Port number */
/*
* Separate the URI into its components...
*/
if (httpSeparateURI(HTTP_URI_CODING_MOST, con->uri,
scheme, sizeof(scheme),
userpass, sizeof(userpass),
hostname, sizeof(hostname), &port,
resource, sizeof(resource)) < HTTP_URI_STATUS_OK)
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad URI \"%s\" in request.",
con->uri);
cupsdSendError(con, HTTP_STATUS_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
/*
* Only allow URIs with the servername, localhost, or an IP
* address...
*/
if (strcmp(scheme, "file") &&
_cups_strcasecmp(hostname, ServerName) &&
_cups_strcasecmp(hostname, "localhost") &&
!cupsArrayFind(ServerAlias, hostname) &&
!isdigit(hostname[0]) && hostname[0] != '[')
{
/*
* Nope, we don't do proxies...
*/
cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad URI \"%s\" in request.",
con->uri);
cupsdSendError(con, HTTP_STATUS_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
/*
* Copy the resource portion back into the URI; both resource and
* con->uri are HTTP_MAX_URI bytes in size...
*/
strlcpy(con->uri, resource, sizeof(con->uri));
}
/*
* Process the request...
*/
gettimeofday(&(con->start), NULL);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "%s %s HTTP/%d.%d",
httpStateString(con->operation) + 11, con->uri,
httpGetVersion(con->http) / 100,
httpGetVersion(con->http) % 100);
if (!cupsArrayFind(ActiveClients, con))
{
cupsArrayAdd(ActiveClients, con);
cupsdSetBusyState(0);
}
case HTTP_STATE_OPTIONS :
case HTTP_STATE_DELETE :
case HTTP_STATE_GET :
case HTTP_STATE_HEAD :
case HTTP_STATE_POST :
case HTTP_STATE_PUT :
case HTTP_STATE_TRACE :
/*
* Parse incoming parameters until the status changes...
*/
while ((status = httpUpdate(con->http)) == HTTP_STATUS_CONTINUE)
if (!httpGetReady(con->http))
break;
if (status != HTTP_STATUS_OK && status != HTTP_STATUS_CONTINUE)
{
if (httpError(con->http) && httpError(con->http) != EPIPE)
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Closing for error %d (%s) while reading headers.",
httpError(con->http), strerror(httpError(con->http)));
else
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Closing on EOF while reading headers.");
cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
break;
default :
if (!httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
{
/*
* Connection closed...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
cupsdCloseClient(con);
return;
}
break; /* Anti-compiler-warning-code */
}
/*
* Handle new transfers...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Read: status=%d, state=%d", status, httpGetState(con->http));
if (status == HTTP_STATUS_OK)
{
/*
* Record whether the client is a web browser. "Mozilla" was the original
* and it seems that every web browser in existence now uses that as the
* prefix with additional information identifying *which* browser.
*
* Chrome (at least) has problems with multiple WWW-Authenticate values in
* a single header, so we only report Basic or Negotiate to web browsers and
* leave the multiple choices to the native CUPS client...
*/
con->is_browser = !strncmp(httpGetField(con->http, HTTP_FIELD_USER_AGENT), "Mozilla/", 8);
if (httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE)[0])
{
/*
* Figure out the locale from the Accept-Language and Content-Type
* fields...
*/
if ((ptr = strchr(httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE),
',')) != NULL)
*ptr = '\0';
if ((ptr = strchr(httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE),
';')) != NULL)
*ptr = '\0';
if ((ptr = strstr(httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE),
"charset=")) != NULL)
{
/*
* Combine language and charset, and trim any extra params in the
* content-type.
*/
snprintf(locale, sizeof(locale), "%s.%s",
httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE), ptr + 8);
if ((ptr = strchr(locale, ',')) != NULL)
*ptr = '\0';
}
else
snprintf(locale, sizeof(locale), "%s.UTF-8",
httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE));
con->language = cupsLangGet(locale);
}
else
con->language = cupsLangGet(DefaultLocale);
cupsdAuthorize(con);
if (!_cups_strncasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
"Keep-Alive", 10) && KeepAlive)
httpSetKeepAlive(con->http, HTTP_KEEPALIVE_ON);
else if (!_cups_strncasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
"close", 5))
httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
if (!httpGetField(con->http, HTTP_FIELD_HOST)[0] &&
httpGetVersion(con->http) >= HTTP_VERSION_1_1)
{
/*
* HTTP/1.1 and higher require the "Host:" field...
*/
if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Missing Host: field in request.");
cupsdCloseClient(con);
return;
}
}
else if (!valid_host(con))
{
/*
* Access to localhost must use "localhost" or the corresponding IPv4
* or IPv6 values in the Host: field.
*/
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Request from \"%s\" using invalid Host: field \"%s\".",
httpGetHostname(con->http, NULL, 0), httpGetField(con->http, HTTP_FIELD_HOST));
if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else if (con->operation == HTTP_STATE_OPTIONS)
{
/*
* Do OPTIONS command...
*/
if (con->best && con->best->type != CUPSD_AUTH_NONE)
{
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_UNAUTHORIZED, NULL, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
if (!_cups_strcasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION), "Upgrade") && strstr(httpGetField(con->http, HTTP_FIELD_UPGRADE), "TLS/") != NULL && !httpIsEncrypted(con->http))
{
#ifdef HAVE_SSL
/*
* Do encryption stuff...
*/
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_SWITCHING_PROTOCOLS, NULL, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
if (cupsd_start_tls(con, HTTP_ENCRYPTION_REQUIRED))
{
cupsdCloseClient(con);
return;
}
#else
if (!cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
#endif /* HAVE_SSL */
}
httpClearFields(con->http);
httpSetField(con->http, HTTP_FIELD_ALLOW,
"GET, HEAD, OPTIONS, POST, PUT");
httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
if (!cupsdSendHeader(con, HTTP_STATUS_OK, NULL, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else if (!is_path_absolute(con->uri))
{
/*
* Protect against malicious users!
*/
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Request for non-absolute resource \"%s\".", con->uri);
if (!cupsdSendError(con, HTTP_STATUS_FORBIDDEN, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else
{
if (!_cups_strcasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
"Upgrade") && !httpIsEncrypted(con->http))
{
#ifdef HAVE_SSL
/*
* Do encryption stuff...
*/
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_SWITCHING_PROTOCOLS, NULL,
CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}