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/*
Unix SMB/CIFS implementation.
SMB backend for the Common UNIX Printing System ("CUPS")
Copyright 1999 by Easy Software Products
Copyright Andrew Tridgell 1994-1998
Copyright Andrew Bartlett 2002
Copyright Rodrigo Fernandez-Vizarra 2005
This program 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.
This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#define PW_MAX_BUF_SIZE sysconf(_SC_GETPW_R_SIZE_MAX)
#define TICKET_CC_DIR "/tmp"
#define CC_PREFIX "krb5cc_" /* prefix of the ticket cache */
#define CC_MAX_FILE_LEN 24
#define CC_MAX_FILE_PATH_LEN (sizeof(TICKET_CC_DIR)-1)+ CC_MAX_FILE_LEN+2
#define OVERWRITE 1
#define KRB5CCNAME "KRB5CCNAME"
/*
* Globals...
*/
extern BOOL in_client; /* Boolean for client library */
/*
* Local functions...
*/
static void list_devices(void);
static struct cli_state *smb_complete_connection(const char *, const char *,int , const char *, const char *, const char *, const char *, int);
static struct cli_state *smb_connect(const char *, const char *, int, const char *, const char *, const char *, const char *);
static int smb_print(struct cli_state *, char *, FILE *);
/*
* 'main()' - Main entry for SMB backend.
*/
int /* O - Exit status */
main(int argc, /* I - Number of command-line arguments */
char *argv[]) /* I - Command-line arguments */
{
int i; /* Looping var */
int copies; /* Number of copies */
int port; /* Port number */
char uri[1024], /* URI */
*sep, /* Pointer to separator */
*password; /* Password */
const char *username, /* Username */
*server, /* Server name */
*printer; /* Printer name */
const char *workgroup; /* Workgroup */
FILE *fp; /* File to print */
int status=0; /* Status of LPD job */
struct cli_state *cli; /* SMB interface */
/* we expect the URI in argv[0]. Detect the case where it is in argv[1] and cope */
if (argc > 2 && strncmp(argv[0],"smb://", 6) && !strncmp(argv[1],"smb://", 6)) {
argv++;
argc--;
}
if (argc == 1)
{
/*
* NEW! In CUPS 1.1 the backends are run with no arguments to list the
* available devices. These can be devices served by this backend
* or any other backends (i.e. you can have an SNMP backend that
* is only used to enumerate the available network printers... :)
*/
list_devices();
return (0);
}
if (argc < 6 || argc > 7)
{
fprintf(stderr, "Usage: %s [DEVICE_URI] job-id user title copies options [file]\n",
argv[0]);
fputs(" The DEVICE_URI environment variable can also contain the\n", stderr);
fputs(" destination printer:\n", stderr);
fputs("\n", stderr);
fputs(" smb://[username:password@][workgroup/]server[:port]/printer\n", stderr);
return (1);
}
/*
* If we have 7 arguments, print the file named on the command-line.
* Otherwise, print data from stdin...
*/
if (argc == 6)
{
/*
* Print from Copy stdin to a temporary file...
*/
fp = stdin;
copies = 1;
}
else if ((fp = fopen(argv[6], "rb")) == NULL)
{
perror("ERROR: Unable to open print file");
return (1);
}
else
copies = atoi(argv[4]);
/*
* Find the URI...
*/
if (getenv("DEVICE_URI") != NULL)
strncpy(uri, getenv("DEVICE_URI"), sizeof(uri) - 1);
else if (strncmp(argv[0], "smb://", 6) == 0)
strncpy(uri, argv[0], sizeof(uri) - 1);
else
{
fputs("ERROR: No device URI found in DEVICE_URI environment variable or argv[0] !\n", stderr);
return (1);
}
uri[sizeof(uri) - 1] = '\0';
/*
* Extract the destination from the URI...
*/
if ((sep = strrchr_m(uri, '@')) != NULL)
{
username = uri + 6;
*sep++ = '\0';
server = sep;
/*
* Extract password as needed...
*/
if ((password = strchr_m(username, ':')) != NULL)
*password++ = '\0';
else
password = "";
}
else
{
username = "";
password = "";
server = uri + 6;
}
if ((sep = strchr_m(server, '/')) == NULL)
{
fputs("ERROR: Bad URI - need printer name!\n", stderr);
return (1);
}
*sep++ = '\0';
printer = sep;
if ((sep = strchr_m(printer, '/')) != NULL)
{
/*
* Convert to smb://[username:password@]workgroup/server/printer...
*/
*sep++ = '\0';
workgroup = server;
server = printer;
printer = sep;
}
else
workgroup = NULL;
if ((sep = strrchr_m(server, ':')) != NULL)
{
*sep++ = '\0';
port=atoi(sep);
}
else
port=0;
/*
* Setup the SAMBA server state...
*/
setup_logging("smbspool", True);
in_client = True; /* Make sure that we tell lp_load we are */
if (!lp_load(dyn_CONFIGFILE, True, False, False))
{
fprintf(stderr, "ERROR: Can't load %s - run testparm to debug it\n", dyn_CONFIGFILE);
return (1);
}
if (workgroup == NULL)
workgroup = lp_workgroup();
load_interfaces();
do
{
if ((cli = smb_connect(workgroup, server, port, printer, username, password, argv[2])) == NULL)
{
if (getenv("CLASS") == NULL)
{
fprintf(stderr, "ERROR: Unable to connect to CIFS host, will retry in 60 seconds...");
sleep (60); /* should just waiting and retrying fix authentication ??? */
}
else
{
fprintf(stderr, "ERROR: Unable to connect to CIFS host, trying next printer...");
return (1);
}
}
}
while (cli == NULL);
/*
* Now that we are connected to the server, ignore SIGTERM so that we
* can finish out any page data the driver sends (e.g. to eject the
* current page... Only ignore SIGTERM if we are printing data from
* stdin (otherwise you can't cancel raw jobs...)
*/
if (argc < 7)
CatchSignal(SIGTERM, SIG_IGN);
/*
* Queue the job...
*/
for (i = 0; i < copies; i ++)
if ((status = smb_print(cli, argv[3] /* title */, fp)) != 0)
break;
cli_shutdown(cli);
/*
* Return the queue status...
*/
return (status);
}
/*
* 'list_devices()' - List the available printers seen on the network...
*/
static void
list_devices(void)
{
/*
* Eventually, search the local workgroup for available hosts and printers.
*/
puts("network smb \"Unknown\" \"Windows Printer via SAMBA\"");
}
/*
* get the name of the newest ticket cache for the uid user.
* pam_krb5 defines a non default ticket cache for each user
*/
static
char * get_ticket_cache( uid_t uid )
{
SMB_STRUCT_DIR *tcdir; /* directory where ticket caches are stored */
SMB_STRUCT_DIRENT *dirent; /* directory entry */
char *filename = NULL; /* holds file names on the tmp directory */
SMB_STRUCT_STAT buf;
char user_cache_prefix[CC_MAX_FILE_LEN];
char file_path[CC_MAX_FILE_PATH_LEN];
char *ticket_file = NULL;
time_t t = 0;
snprintf(user_cache_prefix, CC_MAX_FILE_LEN, "%s%d", CC_PREFIX, uid );
tcdir = sys_opendir( TICKET_CC_DIR );
if ( tcdir == NULL )
return NULL;
while ( (dirent = sys_readdir( tcdir ) ) )
{
filename = dirent->d_name;
snprintf(file_path, CC_MAX_FILE_PATH_LEN,"%s/%s", TICKET_CC_DIR, filename);
if (sys_stat(file_path, &buf) == 0 )
{
if ( ( buf.st_uid == uid ) && ( S_ISREG(buf.st_mode) ) )
{
/*
* check the user id of the file to prevent denial of
* service attacks by creating fake ticket caches for the
* user
*/
if ( strstr( filename, user_cache_prefix ) )
{
if ( buf.st_mtime > t )
{
/*
* a newer ticket cache found
*/
free(ticket_file);
ticket_file=SMB_STRDUP(file_path);
t = buf.st_mtime;
}
}
}
}
}
sys_closedir(tcdir);
if ( ticket_file == NULL )
{
/* no ticket cache found */
fprintf(stderr, "ERROR: No ticket cache found for userid=%d\n", uid);
return NULL;
}
return ticket_file;
}
static struct cli_state
*smb_complete_connection(const char *myname,
const char *server,
int port,
const char *username,
const char *password,
const char *workgroup,
const char *share,
int flags)
{
struct cli_state *cli; /* New connection */
NTSTATUS nt_status;
/* Start the SMB connection */
nt_status = cli_start_connection( &cli, myname, server, NULL, port,
Undefined, flags, NULL);
if (!NT_STATUS_IS_OK(nt_status))
{
return NULL;
}
if ( (username) && (*username) &&
((!password) || ((password) && (strlen(password) == 0 ))) &&
(cli->use_kerberos) )
{
/* Use kerberos authentication */
struct passwd *pw;
char *cache_file;
if ( !(pw = sys_getpwnam(username)) ) {
fprintf(stderr,"ERROR Can not get %s uid\n", username);
cli_shutdown(cli);
return NULL;
}
/*
* Get the ticket cache of the user to set KRB5CCNAME env
* variable
*/
cache_file = get_ticket_cache( pw->pw_uid );
if ( cache_file == NULL )
{
fprintf(stderr, "ERROR: Can not get the ticket cache for %s\n", username);
cli_shutdown(cli);
return NULL;
}
if ( setenv(KRB5CCNAME, cache_file, OVERWRITE) < 0 )
{
fprintf(stderr, "ERROR: Can not add KRB5CCNAME to the environment");
cli_shutdown(cli);
free(cache_file);
return NULL;
}
free(cache_file);
/*
* Change the UID of the process to be able to read the kerberos
* ticket cache
*/
setuid(pw->pw_uid);
}
if (!cli_session_setup(cli, username, password, strlen(password)+1,
password, strlen(password)+1,
workgroup))
{
fprintf(stderr,"ERROR: Session setup failed: %s\n", cli_errstr(cli));
if (NT_STATUS_V(cli_nt_error(cli)) ==
NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
{
fprintf(stderr, "did you forget to run kinit?\n");
}
cli_shutdown(cli);
return NULL;
}
if (!cli_send_tconX(cli, share, "?????", password, strlen(password)+1))
{
fprintf(stderr, "ERROR: Tree connect failed (%s)\n", cli_errstr(cli));
cli_shutdown(cli);
return NULL;
}
return cli;
}
/*
* 'smb_connect()' - Return a connection to a server.
*/
static struct cli_state * /* O - SMB connection */
smb_connect(const char *workgroup, /* I - Workgroup */
const char *server, /* I - Server */
const int port, /* I - Port */
const char *share, /* I - Printer */
const char *username, /* I - Username */
const char *password, /* I - Password */
const char *jobusername) /* I - User who issued the print job */
{
struct cli_state *cli; /* New connection */
pstring myname; /* Client name */
/*
* Get the names and addresses of the client and server...
*/
get_myname(myname);
/* See if we have a username first. This is for backwards compatible
behavior with 3.0.14a */
if ( username && *username )
{
cli = smb_complete_connection(myname, server, port, username,
password, workgroup, share, 0 );
if (cli)
return cli;
}
/*
* Try to use the user kerberos credentials (if any) to authenticate
*/
cli = smb_complete_connection(myname, server, port, jobusername, "",
workgroup, share,
CLI_FULL_CONNECTION_USE_KERBEROS );
if (cli ) { return cli; }
/*
* last try. Use anonymous authentication
*/
cli = smb_complete_connection(myname, server, port, "", "",
workgroup, share, 0);
/*
* Return the new connection...
*/
return (cli);
}
/*
* 'smb_print()' - Queue a job for printing using the SMB protocol.
*/
static int /* O - 0 = success, non-0 = failure */
smb_print(struct cli_state *cli, /* I - SMB connection */
char *title, /* I - Title/job name */
FILE *fp) /* I - File to print */
{
int fnum; /* File number */
int nbytes, /* Number of bytes read */
tbytes; /* Total bytes read */
char buffer[8192], /* Buffer for copy */
*ptr; /* Pointer into tile */
/*
* Sanitize the title...
*/
for (ptr = title; *ptr; ptr ++)
if (!isalnum((int)*ptr) && !isspace((int)*ptr))
*ptr = '_';
/*
* Open the printer device...
*/
if ((fnum = cli_open(cli, title, O_RDWR | O_CREAT | O_TRUNC, DENY_NONE)) == -1)
{
fprintf(stderr, "ERROR: %s opening remote spool %s\n",
cli_errstr(cli), title);
return (1);
}
/*
* Copy the file to the printer...
*/
if (fp != stdin)
rewind(fp);
tbytes = 0;
while ((nbytes = fread(buffer, 1, sizeof(buffer), fp)) > 0)
{
if (cli_write(cli, fnum, 0, buffer, tbytes, nbytes) != nbytes)
{
fprintf(stderr, "ERROR: Error writing spool: %s\n", cli_errstr(cli));
break;
}
tbytes += nbytes;
}
if (!cli_close(cli, fnum))
{
fprintf(stderr, "ERROR: %s closing remote spool %s\n",
cli_errstr(cli), title);
return (1);
}
else
return (0);
}
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