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/*
SSL server program listens on a port, accepts client connection, reads
the data into a temporary file, calls the systemtap translator and
then transmits the resulting file back to the client.
Copyright (C) 2011-2014 Red Hat Inc.
This file is part of systemtap, and 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <fstream>
#include <string>
#include <cerrno>
#include <cassert>
#include <climits>
#include <iostream>
#include <map>
#include <thread>
extern "C" {
#include <unistd.h>
#include <getopt.h>
#include <wordexp.h>
#include <glob.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <pwd.h>
#include <semaphore.h>
#include <nspr.h>
#include <ssl.h>
#include <nss.h>
#include <keyhi.h>
#include <regex.h>
#include <dirent.h>
#include <string.h>
#include <sys/ioctl.h>
#if HAVE_AVAHI
#include <avahi-client/publish.h>
#include <avahi-common/alternative.h>
#include <avahi-common/thread-watch.h>
#include <avahi-common/malloc.h>
#include <avahi-common/error.h>
#include <avahi-common/domain.h>
#include <sys/inotify.h>
#endif
}
#include "util.h"
#include "nsscommon.h"
#include "cscommon.h"
#include "cmdline.h"
using namespace std;
static void cleanup ();
static PRStatus spawn_and_wait (const vector<string> &argv, int *result,
const char* fd0, const char* fd1, const char* fd2,
const char *pwd, const vector<string>& envVec = vector<string> ());
#define MOK_PUBLIC_CERT_NAME "signing_key.x509"
#define MOK_PUBLIC_CERT_FILE "/" MOK_PUBLIC_CERT_NAME
#define MOK_PRIVATE_CERT_NAME "signing_key.priv"
#define MOK_PRIVATE_CERT_FILE "/" MOK_PRIVATE_CERT_NAME
#define MOK_CONFIG_FILE "/x509.genkey"
// MOK_CONFIG_TEXT is the default MOK config text used when creating
// new MOKs. This text is saved to the MOK config file. Once we've
// created it, the server administrator can modify it.
#define MOK_CONFIG_TEXT \
"[ req ]\n" \
"default_bits = 4096\n" \
"distinguished_name = req_distinguished_name\n" \
"prompt = no\n" \
"x509_extensions = myexts\n" \
"\n" \
"[ req_distinguished_name ]\n" \
"O = Systemtap\n" \
"CN = Systemtap module signing key\n" \
"\n" \
"[ myexts ]\n" \
"basicConstraints=critical,CA:FALSE\n" \
"keyUsage=digitalSignature\n" \
"subjectKeyIdentifier=hash\n" \
"authorityKeyIdentifier=keyid\n"
/* getopt variables */
extern int optind;
/* File scope statics. Set during argument parsing and initialization. */
static bool use_db_password;
static unsigned short port;
static long max_threads;
static size_t max_uncompressed_req_size;
static size_t max_compressed_req_size;
static string cert_db_path;
static string stap_options;
static map<string,string> kernel_build_tree; // Kernel version -> build tree
static string arch;
static string cert_serial_number;
static string B_options;
static string I_options;
static string R_option;
static string D_options;
static bool keep_temp;
static string mok_path;
sem_t sem_client;
static int pending_interrupts;
#define CONCURRENCY_TIMEOUT_S 3
// Message handling.
// Server_error messages are printed to stderr and logged, if requested.
static void
server_error (const string &msg, int logit = true)
{
cerr << msg << endl << flush;
// Log it, but avoid repeated messages to the terminal.
if (logit && log_ok ())
log (msg);
}
// client_error messages are treated as server errors and also printed to the client's stderr.
static void
client_error (const string &msg, string stapstderr)
{
server_error (msg);
if (! stapstderr.empty ())
{
ofstream errfile;
errfile.open (stapstderr.c_str (), ios_base::app);
if (! errfile.good ())
server_error (_F("Could not open client stderr file %s: %s", stapstderr.c_str (),
strerror (errno)));
else
errfile << "Server: " << msg << endl;
// NB: No need to close errfile
}
}
// Messages from the nss common code are treated as server errors.
extern "C"
void
nsscommon_error (const char *msg, int logit)
{
server_error (msg, logit);
}
// Fatal errors are treated as server errors but also result in termination
// of the server.
static void
fatal (const string &msg)
{
server_error (msg);
cleanup ();
exit (1);
}
// Argument handling
static void
process_a (const string &arg)
{
arch = arg;
stap_options += " -a " + arg;
}
static void
process_r (const string &arg)
{
if (arg[0] == '/') // fully specified path
kernel_build_tree.insert({kernel_release_from_build_tree(arg), arg});
else
kernel_build_tree.insert({arg, "/lib/modules/" + arg + "/build" });
}
static void
process_log (const char *arg)
{
start_log (arg);
}
static void
parse_options (int argc, char **argv)
{
// Examine the command line. This is the command line for us (stap-serverd) not the command
// line for spawned stap instances.
optind = 1;
while (true)
{
char *num_endptr;
long port_tmp;
long maxsize_tmp;
// NB: The values of these enumerators must not conflict with the values of ordinary
// characters, since those are returned by getopt_long for short options.
enum {
LONG_OPT_PORT = 256,
LONG_OPT_SSL,
LONG_OPT_LOG,
LONG_OPT_MAXTHREADS,
LONG_OPT_MAXREQSIZE = 254,
LONG_OPT_MAXCOMPRESSEDREQ = 255 /* need to set a value otherwise there are conflicts */
};
static struct option long_options[] = {
{ "port", 1, NULL, LONG_OPT_PORT },
{ "ssl", 1, NULL, LONG_OPT_SSL },
{ "log", 1, NULL, LONG_OPT_LOG },
{ "max-threads", 1, NULL, LONG_OPT_MAXTHREADS },
{ "max-request-size", 1, NULL, LONG_OPT_MAXREQSIZE},
{ "max-compressed-request", 1, NULL, LONG_OPT_MAXCOMPRESSEDREQ},
{ NULL, 0, NULL, 0 }
};
int grc = getopt_long (argc, argv, "a:B:D:I:kPr:R:", long_options, NULL);
if (grc < 0)
break;
switch (grc)
{
case 'a':
process_a (optarg);
break;
case 'B':
B_options += string (" -") + (char)grc + optarg;
stap_options += string (" -") + (char)grc + optarg;
break;
case 'D':
D_options += string (" -") + (char)grc + optarg;
stap_options += string (" -") + (char)grc + optarg;
break;
case 'I':
I_options += string (" -") + (char)grc + optarg;
stap_options += string (" -") + (char)grc + optarg;
break;
case 'k':
keep_temp = true;
break;
case 'P':
use_db_password = true;
break;
case 'r':
process_r (optarg);
break;
case 'R':
R_option = string (" -") + (char)grc + optarg;
stap_options += string (" -") + (char)grc + optarg;
break;
case LONG_OPT_PORT:
port_tmp = strtol (optarg, &num_endptr, 10);
if (*num_endptr != '\0')
fatal (_F("%s: cannot parse number '--port=%s'", argv[0], optarg));
else if (port_tmp < 0 || port_tmp > 65535)
fatal (_F("%s: invalid entry: port must be between 0 and 65535 '--port=%s'", argv[0],
optarg));
else
port = (unsigned short) port_tmp;
break;
case LONG_OPT_SSL:
cert_db_path = optarg;
break;
case LONG_OPT_LOG:
process_log (optarg);
break;
case LONG_OPT_MAXTHREADS:
max_threads = strtol (optarg, &num_endptr, 0);
if (*num_endptr != '\0')
fatal (_F("%s: cannot parse number '--max-threads=%s'", argv[0], optarg));
else if (max_threads < 0)
fatal (_F("%s: invalid entry: max threads must not be negative '--max-threads=%s'",
argv[0], optarg));
break;
case LONG_OPT_MAXREQSIZE:
maxsize_tmp = strtoul(optarg, &num_endptr, 0); // store as a long for now
if (*num_endptr != '\0')
fatal (_F("%s: cannot parse number '--max-request-size=%s'", argv[0], optarg));
else if (maxsize_tmp < 1)
fatal (_F("%s: invalid entry: max (uncompressed) request size must be greater than 0 '--max-request-size=%s'",
argv[0], optarg));
max_uncompressed_req_size = (size_t) maxsize_tmp; // convert the long to an unsigned
break;
case LONG_OPT_MAXCOMPRESSEDREQ:
maxsize_tmp = strtoul(optarg, &num_endptr, 0); // store as a long for now
if (*num_endptr != '\0')
fatal (_F("%s: cannot parse number '--max-compressed-request=%s'", argv[0], optarg));
else if (maxsize_tmp < 1)
fatal (_F("%s: invalid entry: max compressed request size must be greater than 0 '--max-compressed-request=%s'",
argv[0], optarg));
max_compressed_req_size = (size_t) maxsize_tmp; // convert the long to an unsigned
break;
case '?':
// Invalid/unrecognized option given. Message has already been issued.
break;
default:
// Reached when one added a getopt option but not a corresponding switch/case:
if (optarg)
server_error (_F("%s: unhandled option '%c %s'", argv[0], (char)grc, optarg));
else
server_error (_F("%s: unhandled option '%c'", argv[0], (char)grc));
break;
}
}
for (int i = optind; i < argc; i++)
server_error (_F("%s: unrecognized argument '%s'", argv[0], argv[i]));
}
static string
server_cert_file ()
{
return server_cert_db_path () + "/stap.cert";
}
// Signal handling. When an interrupt is received, kill any spawned processes
// and exit.
extern "C"
void
handle_interrupt (int sig)
{
pending_interrupts++;
if(pending_interrupts >= 2)
{
log (_F("Received another signal %d, exiting (forced)", sig));
_exit(0);
}
log (_F("Received signal %d, exiting", sig));
}
static void
setup_signals (sighandler_t handler)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = handler;
sigemptyset (&sa.sa_mask);
if (handler != SIG_IGN)
{
sigaddset (&sa.sa_mask, SIGHUP);
sigaddset (&sa.sa_mask, SIGPIPE);
sigaddset (&sa.sa_mask, SIGINT);
sigaddset (&sa.sa_mask, SIGTERM);
sigaddset (&sa.sa_mask, SIGTTIN);
sigaddset (&sa.sa_mask, SIGTTOU);
sigaddset (&sa.sa_mask, SIGXFSZ);
sigaddset (&sa.sa_mask, SIGXCPU);
}
sa.sa_flags = SA_RESTART;
sigaction (SIGHUP, &sa, NULL);
sigaction (SIGPIPE, &sa, NULL);
sigaction (SIGINT, &sa, NULL);
sigaction (SIGTERM, &sa, NULL);
sigaction (SIGTTIN, &sa, NULL);
sigaction (SIGTTOU, &sa, NULL);
sigaction (SIGXFSZ, &sa, NULL);
sigaction (SIGXCPU, &sa, NULL);
}
// Does the server contain a valid directory for the MOK fingerprint?
bool
mok_dir_valid_p (string mok_fingerprint, bool verbose)
{
string mok_dir = mok_path + "/" + mok_fingerprint;
DIR *dirp = opendir (mok_dir.c_str());
if (dirp == NULL)
{
// We can't open the directory. Just quit.
if (verbose)
server_error (_F("Could not open server MOK fingerprint directory %s: %s",
mok_dir.c_str(), strerror(errno)));
return false;
}
// Find both the x509 certificate and private key files.
bool priv_found = false;
bool cert_found = false;
struct dirent *direntp;
while ((direntp = readdir (dirp)) != NULL)
{
bool reg_file = false;
if (direntp->d_type == DT_REG)
reg_file = true;
else if (direntp->d_type == DT_UNKNOWN)
{
struct stat tmpstat;
// If the filesystem doesn't support d_type, we'll have to
// call stat().
int rc = stat((mok_dir + "/" + direntp->d_name).c_str (), &tmpstat);
if (rc == 0 && S_ISREG(tmpstat.st_mode))
reg_file = true;
}
if (! priv_found && reg_file
&& strcmp (direntp->d_name, MOK_PRIVATE_CERT_NAME) == 0)
{
priv_found = true;
continue;
}
if (! cert_found && reg_file
&& strcmp (direntp->d_name, MOK_PUBLIC_CERT_NAME) == 0)
{
cert_found = true;
continue;
}
if (priv_found && cert_found)
break;
}
closedir (dirp);
if (! priv_found || ! cert_found)
{
// We didn't find one (or both) of the required files. Quit.
if (verbose)
server_error (_F("Could not find server MOK files in directory %s",
mok_dir.c_str ()));
return false;
}
// Grab info from the cert.
string fingerprint;
if (read_cert_info_from_file (mok_dir + MOK_PUBLIC_CERT_FILE, fingerprint)
== SECSuccess)
{
// Make sure the fingerprint from the certificate matches the
// directory name.
if (fingerprint != mok_fingerprint)
{
if (verbose)
server_error (_F("Server MOK directory name '%s' doesn't match fingerprint from certificate %s",
mok_dir.c_str(), fingerprint.c_str()));
return false;
}
}
return true;
}
// Get the list of MOK fingerprints on the server. If
// 'only_one_needed' is true, just return the first MOK.
static void
get_server_mok_fingerprints(vector<string> &mok_fingerprints, bool verbose,
bool only_one_needed)
{
DIR *dirp;
struct dirent *direntp;
vector<string> temp;
// Clear the vector.
mok_fingerprints.clear ();
// The directory of machine owner keys (MOK) is optional, so if it
// doesn't exist, we don't worry about it.
dirp = opendir (mok_path.c_str ());
if (dirp == NULL)
{
// If the error isn't ENOENT (Directory does not exist), we've got
// a non-fatal error.
if (errno != ENOENT)
server_error (_F("Could not open server MOK directory %s: %s",
mok_path.c_str (), strerror (errno)));
return;
}
// Create a regular expression object to verify MOK fingerprints
// directory name.
regex_t checkre;
if ((regcomp (&checkre, "^[0-9a-f]{2}(:[0-9a-f]{2})+$",
REG_EXTENDED | REG_NOSUB) != 0))
{
// Not fatal, just ignore the MOK fingerprints.
server_error (_F("Error in MOK fingerprint regcomp: %s",
strerror (errno)));
closedir (dirp);
return;
}
// We've opened the directory, so read all the directory names from
// it.
while ((direntp = readdir (dirp)) != NULL)
{
// We're only interested in directories (of key files).
if (direntp->d_type != DT_DIR)
{
if (direntp->d_type == DT_UNKNOWN)
{
// If the filesystem doesn't support d_type, we'll have to
// call stat().
struct stat tmpstat;
int rc = stat((mok_path + "/" + direntp->d_name).c_str (), &tmpstat);
if (rc || !S_ISDIR(tmpstat.st_mode))
continue;
}
else
continue;
}
// We've got a directory. If the directory name isn't in the right
// format for a MOK fingerprint, skip it.
if ((regexec (&checkre, direntp->d_name, (size_t) 0, NULL, 0) != 0))
continue;
// OK, we've got a directory name in the right format, so save it.
temp.push_back (string (direntp->d_name));
}
regfree (&checkre);
closedir (dirp);
// At this point, we've got a list of directories with names in the
// proper format. Make sure each directory contains a x509
// certificate and private key file.
vector<string>::const_iterator it;
for (it = temp.begin (); it != temp.end (); it++)
{
if (mok_dir_valid_p (*it, true))
{
// Save the info.
mok_fingerprints.push_back (*it);
if (verbose)
server_error (_F("Found MOK with fingerprint '%s'", it->c_str ()));
if (only_one_needed)
break;
}
}
return;
}
#if HAVE_AVAHI
static AvahiEntryGroup *avahi_group = NULL;
static AvahiThreadedPoll *avahi_threaded_poll = NULL;
static char *avahi_service_name = NULL;
static const char * const avahi_service_tag = "_stap._tcp";
static AvahiClient *avahi_client = 0;
static int avahi_collisions = 0;
static int inotify_fd = -1;
static AvahiWatch *avahi_inotify_watch = NULL;
static void create_services (AvahiClient *c);
static int
rename_service ()
{
/*
* Each service must have a unique name on the local network.
* When there is a collision, we try to rename the service.
* However, we need to limit the number of attempts, since the
* service namespace could be maliciously flooded with service
* names designed to maximize collisions.
* Arbitrarily choose a limit of 65535, which is the number of
* TCP ports.
*/
++avahi_collisions;
if (avahi_collisions >= 65535) {
server_error (_F("Too many service name collisions for Avahi service %s",
avahi_service_tag));
return -EBUSY;
}
/*
* Use the avahi-supplied function to generate a new service name.
*/
char *n = avahi_alternative_service_name(avahi_service_name);
server_error (_F("Avahi service name collision, renaming service '%s' to '%s'",
avahi_service_name, n));
avahi_free(avahi_service_name);
avahi_service_name = n;
return 0;
}
static void
entry_group_callback (
AvahiEntryGroup *g,
AvahiEntryGroupState state,
AVAHI_GCC_UNUSED void *userdata
) {
assert(g == avahi_group || avahi_group == NULL);
avahi_group = g;
// Called whenever the entry group state changes.
switch (state)
{
case AVAHI_ENTRY_GROUP_ESTABLISHED:
// The entry group has been established successfully.
log (_F("Avahi service '%s' successfully established.", avahi_service_name));
break;
case AVAHI_ENTRY_GROUP_COLLISION:
// A service name collision with a remote service happened.
// Unfortunately, we don't know which entry collided.
// We need to rename them all and recreate the services.
if (rename_service () == 0)
create_services (avahi_entry_group_get_client (g));
break;
case AVAHI_ENTRY_GROUP_FAILURE:
// Some kind of failure happened.
server_error (_F("Avahi entry group failure: %s",
avahi_strerror (avahi_client_errno (avahi_entry_group_get_client (g)))));
break;
case AVAHI_ENTRY_GROUP_UNCOMMITED:
case AVAHI_ENTRY_GROUP_REGISTERING:
break;
}
}
static void
create_services (AvahiClient *c)
{
assert (c);
// Create a new entry group, if necessary, or reset the existing one.
if (! avahi_group)
{
if (! (avahi_group = avahi_entry_group_new (c, entry_group_callback, NULL)))
{
server_error (_F("avahi_entry_group_new () failed: %s",
avahi_strerror (avahi_client_errno (c))));
return;
}
}
else
avahi_entry_group_reset(avahi_group);
// Contruct the information needed for our service.
log (_F("Adding Avahi service '%s'", avahi_service_name));
AvahiStringList *strlst = NULL;
int ret;
for (auto it = kernel_build_tree.cbegin(); it != kernel_build_tree.cend(); ++it)
{
// Create the txt tags that will be registered with our service.
string sysinfo = "sysinfo=" + it->first + " "+ arch;
string certinfo = "certinfo=" + cert_serial_number;
string version = string ("version=") + CURRENT_CS_PROTOCOL_VERSION;;
string optinfo = "optinfo=";
string separator;
// These option strings already have a leading space.
if (! R_option.empty ())
{
optinfo += R_option.substr(1);
separator = " ";
}
if (! B_options.empty ())
{
optinfo += separator + B_options.substr(1);
separator = " ";
}
if (! D_options.empty ())
{
optinfo += separator + D_options.substr(1);
separator = " ";
}
if (! I_options.empty ())
optinfo += separator + I_options.substr(1);
// Create an avahi string list with the info we have so far.
vector<string> mok_fingerprints;
strlst = avahi_string_list_new(sysinfo.c_str (),
optinfo.c_str (),
version.c_str (),
certinfo.c_str (), NULL);
if (strlst == NULL)
{
server_error (_("Failed to allocate string list"));
goto fail;
}
// Add server MOK info, if available.
get_server_mok_fingerprints (mok_fingerprints, true, false);
if (! mok_fingerprints.empty())
{
for (auto it = mok_fingerprints.cbegin(); it != mok_fingerprints.cend(); it++)
{
string tmp = "mok_info=" + *it;
strlst = avahi_string_list_add(strlst, tmp.c_str ());
if (strlst == NULL)
{
server_error (_("Failed to add a string to the list"));
goto fail;
}
}
}
// We will now add our service to the entry group.
// Loop until no collisions.
for (;;) {
ret = avahi_entry_group_add_service_strlst (avahi_group,
AVAHI_IF_UNSPEC,
AVAHI_PROTO_UNSPEC,
(AvahiPublishFlags)0,
avahi_service_name,
avahi_service_tag,
NULL, NULL, port, strlst);
if (ret == AVAHI_OK)
break; // success!
if (ret == AVAHI_ERR_COLLISION)
{
// A service name collision with a local service happened.
// Pick a new name.
if (rename_service () < 0) {
// Too many collisions. Message already issued.
goto fail;
}
continue; // try again.
}
server_error (_F("Failed to add %s service: %s",
avahi_service_tag, avahi_strerror (ret)));
goto fail;
}
avahi_string_list_free(strlst);
strlst = NULL;
}
// Tell the server to register the service.
if ((ret = avahi_entry_group_commit (avahi_group)) < 0)
{
server_error (_F("Failed to commit avahi entry group: %s", avahi_strerror (ret)));
goto fail;
}
return;
fail:
avahi_entry_group_reset (avahi_group);
avahi_string_list_free(strlst);
}
static void avahi_cleanup_client () {
// This also frees the entry group, if any
if (avahi_client) {
avahi_client_free (avahi_client);
avahi_client = 0;
avahi_group = 0;
}
}
static void
client_callback (AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata)
{
assert(c);
// Called whenever the client or server state changes.
switch (state)
{
case AVAHI_CLIENT_S_RUNNING:
// The server has startup successfully and registered its host
// name on the network, so it's time to create our services.
create_services (c);
break;
case AVAHI_CLIENT_FAILURE:
server_error (_F("Avahi client failure: %s", avahi_strerror (avahi_client_errno (c))));
if (avahi_client_errno (c) == AVAHI_ERR_DISCONNECTED)
{
// The client has been disconnected; probably because the avahi daemon has been
// restarted. We can free the client here and try to reconnect using a new one.
// Passing AVAHI_CLIENT_NO_FAIL allows the new client to be
// created, even if the avahi daemon is not running. Our service will be advertised
// if/when the daemon is started.
avahi_cleanup_client ();
int error;
avahi_client = avahi_client_new (avahi_threaded_poll_get (avahi_threaded_poll),
(AvahiClientFlags)AVAHI_CLIENT_NO_FAIL,
client_callback, NULL, & error);
}
break;
case AVAHI_CLIENT_S_COLLISION:
// Let's drop our registered services. When the server is back
// in AVAHI_SERVER_RUNNING state we will register them
// again with the new host name.
// Fall through ...
case AVAHI_CLIENT_S_REGISTERING:
// The server records are now being established. This
// might be caused by a host name change. We need to wait
// for our own records to register until the host name is
// properly esatblished.
if (avahi_group)
avahi_entry_group_reset (avahi_group);
break;
case AVAHI_CLIENT_CONNECTING:
// The avahi-daemon is not currently running. Our service will be advertised
// if/when the deamon is started.
server_error (_F("The Avahi daemon is not running. Avahi service '%s' will be established when the deamon is started", avahi_service_name));
break;
}
}
static void
inotify_callback (AvahiWatch *, int fd, AvahiWatchEvent, void *)
{
struct inotify_event in_events[10];
ssize_t rc;
// Drain the inotify file. Notice we don't really care what changed,
// we just needed to know that something changed.
do
{
rc = read (fd, in_events, sizeof (in_events));
} while (rc > 0);
// Re-create the services.
if (avahi_client && (avahi_client_get_state (avahi_client)
== AVAHI_CLIENT_S_RUNNING))
create_services (avahi_client);
}
static void
avahi_cleanup ()
{
if (avahi_service_name)
log (_F("Removing Avahi service '%s'", avahi_service_name));
// Stop the avahi client, if it's running
if (avahi_threaded_poll)
avahi_threaded_poll_stop (avahi_threaded_poll);
// Clean up the avahi objects. The order of freeing these is significant.
avahi_cleanup_client ();
if (avahi_inotify_watch)
{
const AvahiPoll *poll = avahi_threaded_poll_get (avahi_threaded_poll);
if (poll)
poll->watch_free (avahi_inotify_watch);
avahi_inotify_watch = NULL;
}
if (inotify_fd >= 0)
{
close (inotify_fd);
inotify_fd = -1;
}
if (avahi_threaded_poll) {
avahi_threaded_poll_free (avahi_threaded_poll);
avahi_threaded_poll = 0;
}
if (avahi_service_name) {
avahi_free (avahi_service_name);
avahi_service_name = 0;
}
}
// The entry point for the avahi client thread.
static void
avahi_publish_service (CERTCertificate *cert)
{
// Get the certificate serial number.
cert_serial_number = get_cert_serial_number (cert);
// Construct the Avahi service name.
char host[HOST_NAME_MAX + 1];
gethostname (host, sizeof(host));
host[sizeof(host) - 1] = '\0';
string buf;
buf = string ("Systemtap Compile Server on ") + host;
// Make sure the service name is valid
const char *initial_service_name = buf.c_str ();
if (! avahi_is_valid_service_name (initial_service_name)) {
// The only restriction on service names is that the buffer must not exceed
// AVAHI_LABEL_MAX in size, which means that the name cannot be longer than
// AVAHI_LABEL_MAX-1 in length.
assert (strlen (initial_service_name) >= AVAHI_LABEL_MAX);
buf = buf.substr (0, AVAHI_LABEL_MAX - 1);
initial_service_name = buf.c_str ();
assert (avahi_is_valid_service_name (initial_service_name));
}
avahi_service_name = avahi_strdup (initial_service_name);
// Allocate main loop object.
if (! (avahi_threaded_poll = avahi_threaded_poll_new ()))
{
server_error (_("Failed to create avahi threaded poll object."));
return;
}
// Always allocate a new client. Passing AVAHI_CLIENT_NO_FAIL allows the client to be
// created, even if the avahi daemon is not running. Our service will be advertised
// if/when the daemon is started.
int error;
avahi_client = avahi_client_new (avahi_threaded_poll_get (avahi_threaded_poll),
(AvahiClientFlags)AVAHI_CLIENT_NO_FAIL,
client_callback, NULL, & error);
// Check whether creating the client object succeeded.
if (! avahi_client)
{
server_error (_F("Failed to create avahi client: %s", avahi_strerror(error)));
return;
}
// Watch the server MOK directory for any changes.
#if defined(IN_CLOEXEC) && defined(IN_NONBLOCK)
inotify_fd = inotify_init1 (IN_CLOEXEC|IN_NONBLOCK);
#else
if ((inotify_fd = inotify_init ()) >= 0)
{
fcntl(inotify_fd, F_SETFD, FD_CLOEXEC);
fcntl(inotify_fd, F_SETFL, O_NONBLOCK);
}
#endif
if (inotify_fd < 0)
server_error (_F("Failed to initialize inotify: %s", strerror (errno)));
else
{
// We want to watch for new or removed MOK directories
// underneath mok_path. But, to do that, mok_path must exist.
if (create_dir (mok_path.c_str (), 0755) != 0)
server_error (_F("Unable to find or create the MOK directory %s: %s",
mok_path.c_str (), strerror (errno)));
// Watch mok_path for changes.
else if (inotify_add_watch (inotify_fd, mok_path.c_str (),
#ifdef IN_ONLYDIR
IN_ONLYDIR|
#endif
IN_CLOSE_WRITE|IN_DELETE|IN_DELETE_SELF|IN_MOVE)
< 0)
server_error (_F("Failed to add inotify watch: %s", strerror (errno)));
else
{
// When mok_path changes, call inotify_callback().
const AvahiPoll *poll = avahi_threaded_poll_get (avahi_threaded_poll);
if (!poll
|| ! (avahi_inotify_watch = poll->watch_new (poll, inotify_fd,
AVAHI_WATCH_IN,
inotify_callback,
NULL)))
server_error (_("Failed to create inotify watcher"));
}
}
// Run the main loop.
avahi_threaded_poll_start (avahi_threaded_poll);
return;
}
#endif // HAVE_AVAHI
static void
advertise_presence (CERTCertificate *cert __attribute ((unused)))
{
#if HAVE_AVAHI
avahi_publish_service (cert);
#else
server_error (_("Unable to advertise presence on the network. Avahi is not available"));
#endif
}
static void
unadvertise_presence ()
{
#if HAVE_AVAHI
avahi_cleanup ();
#endif
}
static void
initialize (int argc, char **argv) {
pending_interrupts = 0;
setup_signals (& handle_interrupt);
// Seed the random number generator. Used to generate noise used during key generation.
srand (time (NULL));
// Initial values.
use_db_password = false;
port = 0;
max_threads = thread::hardware_concurrency(); // Default to number of processors
max_uncompressed_req_size = 50000; // 50 KB: default max uncompressed request size
max_compressed_req_size = 5000; // 5 KB: default max compressed request size
keep_temp = false;
struct utsname utsname;
uname (& utsname);
kernel_build_tree.insert({utsname.release, "/lib/modules/" + string(utsname.release) + "/build"});
arch = normalize_machine (utsname.machine);
// Parse the arguments. This also starts the server log, if any, and should be done before
// any messages are issued.
parse_options (argc, argv);
// PR11197: security prophylactics.
// Reject use as root, except via a special environment variable.
if (! getenv ("STAP_PR11197_OVERRIDE")) {
if (geteuid () == 0)
fatal ("For security reasons, invocation of stap-serverd as root is not supported.");
}
struct passwd *pw = getpwuid (geteuid ());
if (! pw)
fatal (_F("Unable to determine effective user name: %s", strerror (errno)));
string username = pw->pw_name;
pid_t pid = getpid ();
log (_F("===== compile server pid %d starting as %s =====", pid, username.c_str ()));
// Where is the ssl certificate/key database?
if (cert_db_path.empty ())
cert_db_path = server_cert_db_path ();
// Make sure NSPR is initialized. Must be done before NSS is initialized
PR_Init (PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 1);
/* Set the cert database password callback. */
PK11_SetPasswordFunc (nssPasswordCallback);
// Where are the optional machine owner keys (MOK) this server
// knows about?
mok_path = server_cert_db_path() + "/moks";
}
static void
cleanup ()
{
unadvertise_presence ();
end_log ();
}
/* Function: readDataFromSocket()
*
* Purpose: Read data from the socket into a temporary file.
*
*/
static PRInt32
readDataFromSocket(PRFileDesc *sslSocket, const char *requestFileName)
{
PRFileDesc *local_file_fd = 0;
PRInt32 numBytesExpected;
PRInt32 numBytesRead;
PRInt32 numBytesWritten;
PRInt32 totalBytes = 0;
#define READ_BUFFER_SIZE 4096
char buffer[READ_BUFFER_SIZE];
// Read the number of bytes to be received.
numBytesRead = PR_Read_Complete (sslSocket, & numBytesExpected,
(PRInt32)sizeof (numBytesExpected));
if (numBytesRead == 0) /* EOF */
{
server_error (_("Error reading size of request file"));
goto done;
}
if (numBytesRead < 0)
{
server_error (_("Error in PR_Read"));
nssError ();
goto done;
}
/* Convert numBytesExpected from network byte order to host byte order. */
numBytesExpected = ntohl (numBytesExpected);
/* If 0 bytes are expected, then we were contacted only to obtain our certificate.
There is no client request. */
if (numBytesExpected == 0)
return 0;
/* Impose a limit to prevent disk space consumption DoS */
if (numBytesExpected > (PRInt32) max_compressed_req_size)
{
server_error (_("Error size of (compressed) request file is too large"));
goto done;
}
/* Open the output file. */
local_file_fd = PR_Open(requestFileName, PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
PR_IRUSR | PR_IWUSR);
if (local_file_fd == NULL)
{
server_error (_F("Could not open output file %s", requestFileName));
nssError ();
return -1;
}
// Read until EOF or until the expected number of bytes has been read.
for (totalBytes = 0; totalBytes < numBytesExpected; totalBytes += numBytesRead)
{
// No need for PR_Read_Complete here, since we're already managing multiple
// reads to a fixed size buffer.
numBytesRead = PR_Read (sslSocket, buffer, READ_BUFFER_SIZE);
if (numBytesRead == 0)
break; /* EOF */
if (numBytesRead < 0)
{
server_error (_("Error in PR_Read"));
nssError ();
goto done;
}
/* Write to the request file. */
numBytesWritten = PR_Write(local_file_fd, buffer, numBytesRead);
if (numBytesWritten < 0 || (numBytesWritten != numBytesRead))
{
server_error (_F("Could not write to output file %s", requestFileName));
nssError ();
goto done;
}
}
if (totalBytes != numBytesExpected)
{
server_error (_F("Expected %d bytes, got %d while reading client request from socket",
numBytesExpected, totalBytes));
goto done;
}
done:
if (local_file_fd)
PR_Close (local_file_fd);
return totalBytes;
}
/* Function: setupSSLSocket()
*
* Purpose: Configure a socket for SSL.
*
*
*/
static PRFileDesc *
setupSSLSocket (PRFileDesc *tcpSocket, CERTCertificate *cert, SECKEYPrivateKey *privKey)
{
PRFileDesc *sslSocket;
SSLKEAType certKEA;
SECStatus secStatus;
/* Inport the socket into SSL. */
sslSocket = SSL_ImportFD (NULL, tcpSocket);
if (sslSocket == NULL)
{
server_error (_("Could not import socket into SSL"));
nssError ();
return NULL;
}
/* Set the appropriate flags. */
secStatus = SSL_OptionSet (sslSocket, SSL_SECURITY, PR_TRUE);
if (secStatus != SECSuccess)
{
server_error (_("Error setting SSL security for socket"));
nssError ();
return NULL;
}
secStatus = SSL_OptionSet(sslSocket, SSL_HANDSHAKE_AS_SERVER, PR_TRUE);
if (secStatus != SECSuccess)
{
server_error (_("Error setting handshake as server for socket"));
nssError ();
return NULL;
}
secStatus = SSL_OptionSet(sslSocket, SSL_REQUEST_CERTIFICATE, PR_FALSE);
if (secStatus != SECSuccess)
{
server_error (_("Error setting SSL client authentication mode for socket"));
nssError ();
return NULL;
}
secStatus = SSL_OptionSet(sslSocket, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
if (secStatus != SECSuccess)
{
server_error (_("Error setting SSL client authentication mode for socket"));
nssError ();
return NULL;
}
/* Set the appropriate callback routines. */
#if 0 /* use the default */
secStatus = SSL_AuthCertificateHook (sslSocket, myAuthCertificate, CERT_GetDefaultCertDB());
if (secStatus != SECSuccess)
{
nssError ();
server_error (_("Error in SSL_AuthCertificateHook"));
return NULL;
}
#endif
#if 0 /* Use the default */
secStatus = SSL_BadCertHook(sslSocket, (SSLBadCertHandler)myBadCertHandler, &certErr);
if (secStatus != SECSuccess)
{
nssError ();
server_error (_("Error in SSL_BadCertHook"));
return NULL;
}
#endif
#if 0 /* no handshake callback */
secStatus = SSL_HandshakeCallback(sslSocket, myHandshakeCallback, NULL);
if (secStatus != SECSuccess)
{
server_error (_("Error in SSL_HandshakeCallback"));
nssError ();
return NULL;
}
#endif
certKEA = NSS_FindCertKEAType (cert);
secStatus = SSL_ConfigSecureServer (sslSocket, cert, privKey, certKEA);
if (secStatus != SECSuccess)
{
server_error (_("Error configuring SSL server"));
nssError ();
return NULL;
}
return sslSocket;
}
#if 0 /* No client authentication (for now) and not authenticating after each transaction. */
/* Function: authenticateSocket()
*
* Purpose: Perform client authentication on the socket.
*
*/
static SECStatus
authenticateSocket (PRFileDesc *sslSocket, PRBool requireCert)
{
CERTCertificate *cert;
SECStatus secStatus;
/* Returns NULL if client authentication is not enabled or if the
* client had no certificate. */
cert = SSL_PeerCertificate(sslSocket);
if (cert)
{
/* Client had a certificate, so authentication is through. */
CERT_DestroyCertificate(cert);
return SECSuccess;
}
/* Request client to authenticate itself. */
secStatus = SSL_OptionSet(sslSocket, SSL_REQUEST_CERTIFICATE, PR_TRUE);
if (secStatus != SECSuccess)
{
server_error (_("Error in SSL_OptionSet:SSL_REQUEST_CERTIFICATE"));
nssError ();
return SECFailure;
}
/* If desired, require client to authenticate itself. Note
* SSL_REQUEST_CERTIFICATE must also be on, as above. */
secStatus = SSL_OptionSet(sslSocket, SSL_REQUIRE_CERTIFICATE, requireCert);
if (secStatus != SECSuccess)
{
server_error (_("Error in SSL_OptionSet:SSL_REQUIRE_CERTIFICATE"));
nssError ();
return SECFailure;
}
/* Having changed socket configuration parameters, redo handshake. */
secStatus = SSL_ReHandshake(sslSocket, PR_TRUE);
if (secStatus != SECSuccess)
{
server_error (_("Error in SSL_ReHandshake"));
nssError ();
return SECFailure;
}
/* Force the handshake to complete before moving on. */
secStatus = SSL_ForceHandshake(sslSocket);
if (secStatus != SECSuccess)
{
server_error (_("Error in SSL_ForceHandshake"));
nssError ();
return SECFailure;
}
return SECSuccess;
}
#endif /* No client authentication and not authenticating after each transaction. */
/* Function: writeDataToSocket
*
* Purpose: Write the server's response back to the socket.
*
*/
static SECStatus
writeDataToSocket(PRFileDesc *sslSocket, const char *responseFileName)
{
PRFileDesc *local_file_fd = PR_Open (responseFileName, PR_RDONLY, 0);
if (local_file_fd == NULL)
{
server_error (_F("Could not open input file %s", responseFileName));
nssError ();
return SECFailure;
}
/* Transmit the local file across the socket.
*/
int numBytes = PR_TransmitFile (sslSocket, local_file_fd,
NULL, 0,
PR_TRANSMITFILE_KEEP_OPEN,
PR_INTERVAL_NO_TIMEOUT);
/* Error in transmission. */
SECStatus secStatus = SECSuccess;
if (numBytes < 0)
{
server_error (_("Error writing response to socket"));
nssError ();
secStatus = SECFailure;
}
PR_Close (local_file_fd);
return secStatus;
}
static void
get_stap_locale (const string &staplang, vector<string> &envVec, string stapstderr, cs_protocol_version *client_version)
{
// If the client version is < 1.6, then no file containing environment
// variables defining the locale has been passed.
if (*client_version < "1.6")
return;
/* Go through each line of the file, verify it, then add it to the vector */
ifstream langfile;
langfile.open(staplang.c_str());
if (!langfile.is_open())
{
// Not fatal. Proceed with the environment we have.
server_error(_F("Unable to open file %s for reading: %s", staplang.c_str(),
strerror (errno)));
return;
}
/* Unpackage internationalization variables and verify their contents */
map<string, string> envMap; /* To temporarily store the entire array of strings */
string line;
const set<string> &locVars = localization_variables();
/* Copy the global environ variable into the map */
if(environ != NULL)
{
for (unsigned i=0; environ[i]; i++)
{
string line = (string)environ[i];
/* Find the first '=' sign */
size_t pos = line.find("=");
/* Make sure it found an '=' sign */
if(pos != string::npos)
/* Everything before the '=' sign is the key, and everything after is the value. */
envMap[line.substr(0, pos)] = line.substr(pos+1);
}
}
/* Create regular expression objects to verify lines read from file. Should not allow
spaces, ctrl characters, etc */
regex_t checkre;
if ((regcomp(&checkre, "^[a-zA-Z0-9@_.=-]*$", REG_EXTENDED | REG_NOSUB) != 0))
{
// Not fatal. Proceed with the environment we have.
server_error(_F("Error in regcomp: %s", strerror (errno)));
return;
}
while (1)
{
getline(langfile, line);
if (!langfile.good())
break;
/* Extract key and value from the line. Note: value may contain "=". */
string key;
string value;
size_t pos;
pos = line.find("=");
if (pos == string::npos)
{
client_error(_F("Localization key=value line '%s' cannot be parsed", line.c_str()), stapstderr);
continue;
}
key = line.substr(0, pos);
pos++;
value = line.substr(pos);
/* Make sure the key is found in the localization variables global set */
if (locVars.find(key) == locVars.end())
{
// Not fatal. Just ignore it.
client_error(_F("Localization key '%s' not found in global list", key.c_str()), stapstderr);
continue;
}
/* Make sure the value does not contain illegal characters */
if ((regexec(&checkre, value.c_str(), (size_t) 0, NULL, 0) != 0))
{
// Not fatal. Just ignore it.
client_error(_F("Localization value '%s' contains illegal characters", value.c_str()), stapstderr);
continue;
}
/* All is good, copy line into envMap, replacing if already there */
envMap[key] = value;
}
if (!langfile.eof())
{
// Not fatal. Proceed with what we have.
server_error(_F("Error reading file %s: %s", staplang.c_str(), strerror (errno)));
}
regfree(&checkre);
/* Copy map into vector */
for (map<string, string>::iterator it = envMap.begin(); it != envMap.end(); it++)
envVec.push_back(it->first + "=" + it->second);
}
static void
get_client_mok_fingerprints (const string &filename,
vector<string> &mok_fingerprints,
string stapstderr,
cs_protocol_version *client_version)
{
// If the client version is < 1.6, then no file containing MOK
// fingerprints could have been passed.
if (*client_version < "1.6") {
return;
}
// Go through each line of the file and add it to the vector.
ifstream file;
file.open(filename.c_str());
if (! file.is_open())
// If the file isn't present, that's fine. It just means that the
// module doesn't need to be signed.
return;
// Create a regular expression object to verify lines read from the
// file.
regex_t checkre;
if (regcomp(&checkre, "^([0-9a-f]{2}(:[0-9a-f]{2})+)$", REG_EXTENDED)
!= 0)
{
// Not fatal, just ignore the MOK fingerprints.
server_error(_F("Error in MOK fingerprint regcomp: %s",
strerror (errno)));
return;
}
// Unpack the MOK fingerprints. Notice we make sure the fingerprint
// is in the right format, but that's all we can do at this
// point. Later we'll check this client list against our server
// list.
string line;
regmatch_t matches[3];
while (getline (file, line))
{
string fingerprint;
if ((regexec(&checkre, line.c_str(), 3, matches, 0) != 0))
{
// Not fatal. Just ignore it.
client_error(_F("MOK fingerprint value '%s' isn't in the correct forma",
line.c_str()), stapstderr);
continue;
}
// Save the fingerprint:
// matches[0] is the range of the entire match
// matches[1] is the entire fingerprint
// matches[2] is a portion of the fingerprint
if (matches[1].rm_so >= 0)
fingerprint = line.substr(matches[1].rm_so,
matches[1].rm_eo - matches[1].rm_so);
if (! fingerprint.empty())
mok_fingerprints.push_back(fingerprint);
}
regfree(&checkre);
}
bool
mok_sign_file (std::string &mok_fingerprint,
const std::string &kernel_build_tree,
const std::string &name,
std::string stapstderr)
{
int rc;
string mok_directory = mok_path + "/" + mok_fingerprint;
vector<string> cmd
{
kernel_build_tree + "/scripts/sign-file",
"sha512",
mok_directory + MOK_PRIVATE_CERT_FILE,
mok_directory + MOK_PUBLIC_CERT_FILE,
name
};
rc = stap_system (0, cmd);
if (rc != 0)
{
client_error (_F("Running sign-file failed, rc = %d", rc), stapstderr);
return false;
}
else
{
client_error (_F("Module signed with MOK, fingerprint \"%s\"",
mok_fingerprint.c_str()), stapstderr);
return true;
}
}
// Filter paths prefixed with the server's home directory from the given file.
//
static void
filter_response_file (const string &file_name, const string &responseDirName)
{
// Filter the server's home directory name
string swap = string ("s,") + get_home_directory () + ",<server>,g";
vector<string> cmd { "sed", "-i", swap, file_name };
(void) stap_system (0, cmd);
// Filter the server's response directory name
swap = string ("s,") + responseDirName + ",<server>,g";
cmd = { "sed", "-i", swap, file_name };
(void) stap_system (0, cmd);
}
static privilege_t
getRequestedPrivilege (const vector<string> &stapargv)
{
// The purpose of this function is to find the --privilege or --unprivileged option specified
// by the user on the client side. We need to parse the command line completely, but we can
// exit when we find the first --privilege or --unprivileged option, since stap does not allow
// multiple privilege levels to specified on the same command line.
//
// Note that we need not do any options consistency checking since our spawned stap instance
// will do that.
//
// Create an argv/argc for use by getopt_long.
int argc = stapargv.size();
char ** argv = new char *[argc + 1];
for (unsigned i = 0; i < stapargv.size(); ++i)
argv[i] = (char *)stapargv[i].c_str();
argv[argc] = NULL;
privilege_t privilege = pr_highest; // Until specified otherwise.
optind = 1;
while (true)
{
// We need only allow getopt to parse the options until we find a
// --privilege or --unprivileged option.
int grc = getopt_long (argc, argv, STAP_SHORT_OPTIONS, stap_long_options, NULL);
if (grc < 0)
break;
switch (grc)
{
default:
// We can ignore all options other than --privilege and --unprivileged.
break;
case LONG_OPT_PRIVILEGE:
if (strcmp (optarg, "stapdev") == 0)
privilege = pr_stapdev;
else if (strcmp (optarg, "stapsys") == 0)
privilege = pr_stapsys;
else if (strcmp (optarg, "stapusr") == 0)
privilege = pr_stapusr;
else
{
server_error (_F("Invalid argument '%s' for --privilege", optarg));
privilege = pr_highest;
}
// We have discovered the client side --privilege option. We can exit now since
// stap only tolerates one privilege setting option.
goto done; // break 2 switches and a loop
case LONG_OPT_UNPRIVILEGED:
privilege = pr_unprivileged;
// We have discovered the client side --unprivileged option. We can exit now since
// stap only tolerates one privilege setting option.
goto done; // break 2 switches and a loop
}
}
done:
delete[] argv;
return privilege;
}
static void
generate_mok(string &mok_fingerprint)
{
vector<string> cmd;
int rc;
char tmpdir[PATH_MAX] = { '\0' };
string public_cert_path, private_cert_path, destdir;
mode_t old_umask;
mok_fingerprint.clear ();
// Set umask so that everything is private.
old_umask = umask(077);
// Make sure the config file exists. If not, create it with default
// contents.
string config_path = mok_path + MOK_CONFIG_FILE;
if (! file_exists (config_path))
{
ofstream config_stream;
config_stream.open (config_path.c_str ());
if (! config_stream.good ())
{
server_error (_F("Could not open MOK config file %s: %s",
config_path.c_str (), strerror (errno)));
goto cleanup;
}
config_stream << MOK_CONFIG_TEXT;
config_stream.close ();
}
// Make a temporary directory to store results in.
snprintf (tmpdir, PATH_MAX, "%s/stap-server.XXXXXX", mok_path.c_str ());
if (mkdtemp (tmpdir) == NULL)
{
server_error (_F("Could not create temporary directory %s: %s", tmpdir,
strerror (errno)));
tmpdir[0] = '\0';
goto cleanup;
}
// Actually generate key using openssl.
public_cert_path = tmpdir + string (MOK_PUBLIC_CERT_FILE);
private_cert_path = tmpdir + string (MOK_PRIVATE_CERT_FILE);
cmd =
{
"openssl", "req", "-new", "-nodes", "-utf8",
"-sha256", "-days", "36500", "-batch", "-x509",
"-config", config_path,
"-outform", "DER",
"-out", public_cert_path,
"-keyout", private_cert_path
};
rc = stap_system (0, cmd);
if (rc != 0)
{
server_error (_F("Generating MOK failed, rc = %d", rc));
goto cleanup;
}
// Grab the fingerprint from the cert.
if (read_cert_info_from_file (public_cert_path, mok_fingerprint)
!= SECSuccess)
goto cleanup;
// Once we know the fingerprint, rename the temporary directory.
destdir = mok_path + "/" + mok_fingerprint;
if (rename (tmpdir, destdir.c_str ()) < 0)
{
server_error (_F("Could not rename temporary directory %s to %s: %s",
tmpdir, destdir.c_str (), strerror (errno)));
goto cleanup;
}
// Restore the old umask.
umask(old_umask);
return;
cleanup:
// Remove the temporary directory.
cmd = { "rm", "-rf", tmpdir };
rc = stap_system (0, cmd);
if (rc != 0)
server_error (_("Error in tmpdir cleanup"));
mok_fingerprint.clear ();
// Restore the old umask.
umask(old_umask);
return;
}
/* Run the translator on the data in the request directory, and produce output
in the given output directory. */
static void
handleRequest (const string &requestDirName, const string &responseDirName, string stapstderr)
{
vector<string> stapargv;
cs_protocol_version client_version = "1.0"; // Assumed until discovered otherwise
int rc;
wordexp_t words;
unsigned u;
unsigned i;
FILE* f;
// Save the server version. Do this early, so the client knows what version of the server
// it is dealing with, even if the request is not fully completed.
string stapversion = responseDirName + "/version";
f = fopen (stapversion.c_str (), "w");
if (f)
{
fputs (CURRENT_CS_PROTOCOL_VERSION, f);
fclose(f);
}
else
server_error (_F("Unable to open client version file %s", stapversion.c_str ()));
// Get the client version. The default version is already set. Use it if we fail here.
string filename = requestDirName + "/version";
if (file_exists (filename))
read_from_file (filename, client_version);
log (_F("Client version is %s", client_version.v));
// The name of the translator executable.
stapargv.push_back ((char *)(getenv ("SYSTEMTAP_STAP") ?: STAP_PREFIX "/bin/stap"));
// Fetch the target kernel version from request and pass flag to stap
string kernel_version;
filename = requestDirName + "/sysinfo";
ifstream versionfile(filename.c_str());
if (versionfile >> kernel_version >> kernel_version) // Skip sysinfo: label
{
if (kernel_build_tree.find(kernel_version) != kernel_build_tree.end())
{
stapargv.push_back("-r" + kernel_version);
}
else
{
log(_F("Target kernel version %s is not supported by this server",
kernel_version.c_str()));
return;
}
}
else
{
server_error(_("Unable to read sysinfo"));
return;
}
/* Transcribe stap_options. We use plain wordexp(3), since these
options are coming from the local trusted user, so malicious
content is not a concern. */
// TODO: Use tokenize here.
rc = wordexp (stap_options.c_str (), & words, WRDE_NOCMD|WRDE_UNDEF);
if (rc)
{
server_error (_("Cannot parse stap options"));
return;
}
for (u=0; u<words.we_wordc; u++)
stapargv.push_back (words.we_wordv[u]);
/* Process the saved command line arguments. Avoid quoting/unquoting errors by
transcribing literally. */
string new_staptmpdir = responseDirName + "/stap000000";
rc = mkdir(new_staptmpdir.c_str(), 0700);
if (rc)
server_error(_F("Could not create temporary directory %s", new_staptmpdir.c_str()));
stapargv.push_back("--tmpdir=" + new_staptmpdir);
stapargv.push_back ("--client-options");
string stap_opts = "";
for (i=1 ; ; i++)
{
char stapargfile[PATH_MAX];
FILE* argfile;
struct stat st;
char *arg;
snprintf (stapargfile, PATH_MAX, "%s/argv%d", requestDirName.c_str (), i);
rc = stat(stapargfile, & st);
if (rc) break;
arg = (char *)malloc (st.st_size+1);
if (!arg)
{
server_error (_("Out of memory"));
return;
}
argfile = fopen(stapargfile, "r");
if (! argfile)
{
free(arg);
server_error (_F("Error opening %s: %s", stapargfile, strerror (errno)));
return;
}
rc = fread(arg, 1, st.st_size, argfile);
if (rc != st.st_size)
{
free(arg);
fclose(argfile);
server_error (_F("Error reading %s: %s", stapargfile, strerror (errno)));
return;
}
arg[st.st_size] = '\0';
stapargv.push_back (arg);
stap_opts.append(arg);
stap_opts.append(" ");
free (arg);
fclose (argfile);
}
log(_F("Options passed from the client: %s", stap_opts.c_str()));
string stapstdout = responseDirName + "/stdout";
// NB: Before, when we did not fully parse the client's command line using getopt_long,
// we used to insert a --privilege=XXX option here in case some other argument was mistaken
// for a --privilege or --unprivileged option by our spawned stap. Since we now parse
// the client's command line using getopt_long and share the getopt_long options
// string and table with stap, this is no longer necessary. stap will parse the
// command line identically to the way we have parsed it and will discover the same
// privilege-setting option.
// Environment variables (possibly empty) to be passed to spawn_and_wait().
string staplang = requestDirName + "/locale";
vector<string> envVec;
get_stap_locale (staplang, envVec, stapstderr, &client_version);
// Machine owner keys (MOK) fingerprints (possibly nonexistent), to
// be used as a list of valid keys that the module must be signed with.
vector<string> client_mok_fingerprints;
get_client_mok_fingerprints(requestDirName + "/mok_fingerprints",
client_mok_fingerprints, stapstderr,
&client_version);
// If the client sent us MOK fingerprints, see if we have a matching
// MOK on the server.
string mok_fingerprint;
if (! client_mok_fingerprints.empty())
{
// See if any of the client MOK fingerprints exist on the server.
vector<string>::const_iterator it;
for (it = client_mok_fingerprints.begin();
it != client_mok_fingerprints.end(); it++)
{
if (mok_dir_valid_p (*it, false))
{
mok_fingerprint = *it;
break;
}
}
// If the client requires signing, but we couldn't find a
// matching machine owner key installed on the server, we can't
// build a signed module. But, the client may not have asked us
// to create a module (for instance, the user could have done
// 'stap -L syscall.open'). So, keep going until we know we need
// to sign a module.
}
/* All ready, let's run the translator! */
int staprc;
rc = spawn_and_wait(stapargv, &staprc, "/dev/null", stapstdout.c_str (),
stapstderr.c_str (), requestDirName.c_str (), envVec);
if (rc != PR_SUCCESS)
{
server_error(_("Failed spawning translator"));
return;
}
// In unprivileged modes, if we have a module built, we need to sign
// the sucker. We also might need to sign the module for secure
// boot purposes.
privilege_t privilege = getRequestedPrivilege (stapargv);
if (staprc == 0 && (pr_contains (privilege, pr_stapusr)
|| pr_contains (privilege, pr_stapsys)
|| ! client_mok_fingerprints.empty ()))
{
glob_t globber;
char pattern[PATH_MAX];
snprintf (pattern, PATH_MAX, "%s/*.ko", new_staptmpdir.c_str());
rc = glob (pattern, GLOB_ERR, NULL, &globber);
if (rc)
server_error (_F("Unable to find a module in %s", new_staptmpdir.c_str()));
else if (globber.gl_pathc != 1)
server_error (_F("Too many modules (%zu) in %s", globber.gl_pathc, new_staptmpdir.c_str()));
else
{
if (pr_contains (privilege, pr_stapusr)
|| pr_contains (privilege, pr_stapsys))
sign_file (cert_db_path, server_cert_nickname(),
globber.gl_pathv[0],
string(globber.gl_pathv[0]) + ".sgn");
if (! mok_fingerprint.empty ())
{
// If we signing the module failed, change the staprc to
// 1, so that the client won't try to run the resulting
// module, which wouldn't work.
if (! mok_sign_file (mok_fingerprint, kernel_build_tree[kernel_version],
globber.gl_pathv[0], stapstderr))
staprc = 1;
}
else if (! client_mok_fingerprints.empty ())
{
// If we're here, the client sent us MOK fingerprints
// (since client_mok_fingerprints isn't empty), but we
// don't have a matching MOK on the server (since
// mok_fingerprint is empty). So, we can't sign the
// module.
client_error (_("No matching machine owner key (MOK) available on the server to sign the\n module."), stapstderr);
// Since we can't sign the module, send the client one
// of our MOKs. If we don't have any, create one.
vector<string> mok_fingerprints;
get_server_mok_fingerprints(mok_fingerprints, false, true);
if (mok_fingerprints.empty ())
{
// Generate a new MOK.
generate_mok(mok_fingerprint);
}
else
{
// At this point we have at least one MOK on the
// server. Send the public key down to the
// client.
mok_fingerprint = *mok_fingerprints.begin ();
}
if (! mok_fingerprint.empty ())
{
// Copy the public cert file to the response directory.
string mok_directory = mok_path + "/" + mok_fingerprint;
string src = mok_directory + MOK_PUBLIC_CERT_FILE;
string dst = responseDirName + MOK_PUBLIC_CERT_FILE;
if (copy_file (src, dst, true))
client_error ("The server has no machine owner key (MOK) in common with this\nsystem. Use the following command to import a server MOK into this\nsystem, then reboot:\n\n\tmokutil --import signing_key.x509", stapstderr);
else
client_error ("The server has no machine owner key (MOK) in common with this\nsystem. The server failed to return a certificate.", stapstderr);
}
else
{
client_error ("The server has no machine owner keys (MOK) in common with this\nsystem. The server could not generate a new MOK.", stapstderr);
}
// If we couldn't sign the module, let's change the
// staprc to 1, so that the client won't try to run the
// resulting module, which wouldn't work.
staprc = 1;
}
}
}
// Save the RC (which might have gotten changed above).
ofstream ofs((responseDirName + "/rc").c_str());
ofs << staprc;
ofs.close();
/* If uprobes.ko is required, it will have been built or cache-copied into
* the temp directory. We need to pack it into the response where the client
* can find it, and sign, if necessary, for unprivileged users.
*/
string uprobes_ko = new_staptmpdir + "/uprobes/uprobes.ko";
if (get_file_size(uprobes_ko) > 0)
{
/* uprobes.ko is required.
*
* It's already underneath the stap tmpdir, but older stap clients
* don't know to look for it there, so, for these clients, we end up packing uprobes twice
* into the zip. We could move instead of symlink.
*/
string uprobes_response;
if (client_version < "1.6")
{
uprobes_response = (string)responseDirName + "/uprobes.ko";
rc = symlink(uprobes_ko.c_str(), uprobes_response.c_str());
if (rc != 0)
server_error (_F("Could not link to %s from %s",
uprobes_ko.c_str(), uprobes_response.c_str()));
}
else
uprobes_response = uprobes_ko;
/* In unprivileged mode, we need a signature on uprobes as well. */
if (! pr_contains (privilege, pr_stapdev))
{
sign_file (cert_db_path, server_cert_nickname(),
uprobes_response, uprobes_response + ".sgn");
}
// Notice we're not giving an error message here if the client
// requires signed modules. The error will have been generated
// above on the systemtap module itself.
if (! mok_fingerprint.empty ())
mok_sign_file (mok_fingerprint, kernel_build_tree[kernel_version], uprobes_response,
stapstderr);
}
/* Free up all the arg string copies. Note that the first few were alloc'd
by wordexp(), which wordfree() frees; others were hand-set to literal strings. */
wordfree (& words);
// Filter paths prefixed with the server's home directory from the stdout and stderr
// files in the response.
filter_response_file (stapstdout, responseDirName);
filter_response_file (stapstderr, responseDirName);
/* Sorry about the inconvenience. C string/file processing is such a pleasure. */
}
/* A front end for stap_spawn that handles stdin, stdout, stderr, switches to a working
directory and returns overall success or failure. */
static PRStatus
spawn_and_wait (const vector<string> &argv, int *spawnrc,
const char* fd0, const char* fd1, const char* fd2,
const char *pwd, const vector<string>& envVec)
{
pid_t pid;
int rc;
posix_spawn_file_actions_t actions;
int dotfd = -1;
#define CHECKRC(msg) do { if (rc) { server_error (_(msg)); return PR_FAILURE; } } while (0)
rc = posix_spawn_file_actions_init (& actions);
CHECKRC ("Error in spawn file actions ctor");
if (fd0) {
rc = posix_spawn_file_actions_addopen(& actions, 0, fd0, O_RDONLY, 0600);
CHECKRC ("Error in spawn file actions fd0");
}
if (fd1) {
rc = posix_spawn_file_actions_addopen(& actions, 1, fd1, O_WRONLY|O_CREAT, 0600);
CHECKRC ("Error in spawn file actions fd1");
}
if (fd2) {
// Use append mode for stderr because it gets written to in other places in the server.
rc = posix_spawn_file_actions_addopen(& actions, 2, fd2, O_WRONLY|O_APPEND|O_CREAT, 0600);
CHECKRC ("Error in spawn file actions fd2");
}
/* change temporarily to a directory if requested */
if (pwd)
{
dotfd = open (".", O_RDONLY);
if (dotfd < 0)
{
server_error (_("Error in spawn getcwd"));
return PR_FAILURE;
}
rc = chdir (pwd);
if (rc)
{
close(dotfd);
server_error(_("Error in spawn chdir"));
return PR_FAILURE;
}
}
pid = stap_spawn (0, argv, & actions, envVec);
/* NB: don't react to pid==-1 right away; need to chdir back first. */
if (pwd && dotfd >= 0)
{
int subrc;
subrc = fchdir (dotfd);
subrc |= close (dotfd);
if (subrc)
server_error (_("Error in spawn unchdir"));
}
if (pid == -1)
{
server_error (_F("Error in spawn: %s", strerror (errno)));
return PR_FAILURE;
}
*spawnrc = stap_waitpid (0, pid);
if (*spawnrc == -1) // something wrong with waitpid() call itself
{
server_error (_("Error in waitpid"));
return PR_FAILURE;
}
rc = posix_spawn_file_actions_destroy (&actions);
CHECKRC ("Error in spawn file actions dtor");
return PR_SUCCESS;
#undef CHECKRC
}
/* Given the path to the compressed request file, return 0 if the size of the
* uncompressed request is within the determined limit. */
int
check_uncompressed_request_size (const char * zip_file)
{
ostringstream result;
// Generate the command to heck the uncompressed size
vector<string> args { "unzip", "-Zt", zip_file };
int rc = stap_system_read (0, args, result);
if (rc != 0)
{
server_error (_F("Unable to check the zipefile size. Error code: %d .", rc));
return rc;
}
// Parse the result from the unzip call, looking for the third token
vector<string> toks;
tokenize(result.str(), toks, " ");
if (toks.size() < 3)
{
// Something went wrong and the format is probably not what we expect.
server_error("Unable to check the uncompressed zipfile size. Output came in an unexpected format.");
return -1;
}
long uncomp_size = atol(toks[2].c_str());
if (uncomp_size < 1 || (unsigned)uncomp_size > max_uncompressed_req_size)
{
server_error(_F("Uncompressed request size of %ld bytes is not within the expected range of 1 to %zu bytes.",
uncomp_size,max_uncompressed_req_size));
return -1;
}
return 0; // If it got to this point, everthing went well.
}
/* Function: void *handle_connection()
*
* Purpose: Handle a connection to a socket. Copy in request zip
* file, process it, copy out response. Temporary directories are
* created & destroyed here.
*/
void *
handle_connection (void *arg)
{
PRFileDesc * sslSocket = NULL;
SECStatus secStatus = SECFailure;
PRStatus prStatus;
int rc;
char *rc1;
char tmpdir[PATH_MAX];
char requestFileName[PATH_MAX];
char requestDirName[PATH_MAX];
char responseDirName[PATH_MAX];
char responseFileName[PATH_MAX];
string stapstderr; /* Cannot be global since we need a unique
copy for each connection.*/
vector<string> argv;
PRInt32 bytesRead;
/* Detatch to avoid a memory leak */
if(max_threads > 0)
pthread_detach(pthread_self());
/* Unpack the arg */
thread_arg *t_arg = (thread_arg *) arg;
PRFileDesc *tcpSocket = t_arg->tcpSocket;
CERTCertificate *cert = t_arg->cert;
SECKEYPrivateKey *privKey = t_arg->privKey;
PRNetAddr addr = t_arg->addr;
tmpdir[0]='\0'; /* prevent cleanup-time /bin/rm of uninitialized directory */
#if 0 // already done on the listenSocket
/* Make sure the socket is blocking. */
PRSocketOptionData socketOption;
socketOption.option = PR_SockOpt_Nonblocking;
socketOption.value.non_blocking = PR_FALSE;
PR_SetSocketOption (tcpSocket, &socketOption);
#endif
secStatus = SECFailure;
sslSocket = setupSSLSocket (tcpSocket, cert, privKey);
if (sslSocket == NULL)
{
// Message already issued.
goto cleanup;
}
secStatus = SSL_ResetHandshake(sslSocket, /* asServer */ PR_TRUE);
if (secStatus != SECSuccess)
{
server_error (_("Error resetting SSL handshake"));
nssError ();
goto cleanup;
}
#if 0 // The client authenticates the server, so the client initiates the handshake
/* Force the handshake to complete before moving on. */
secStatus = SSL_ForceHandshake(sslSocket);
if (secStatus != SECSuccess)
{
server_error (_("Error forcing SSL handshake"));
nssError ();
goto cleanup;
}
#endif
secStatus = SECFailure;
snprintf(tmpdir, PATH_MAX, "%s/stap-server.XXXXXX", getenv("TMPDIR") ?: "/tmp");
rc1 = mkdtemp(tmpdir);
if (! rc1)
{
server_error (_F("Could not create temporary directory %s: %s", tmpdir, strerror(errno)));
tmpdir[0]=0; /* prevent /bin/rm */
goto cleanup;
}
/* Create a temporary files names and directories. */
snprintf (requestFileName, PATH_MAX, "%s/request.zip", tmpdir);
snprintf (requestDirName, PATH_MAX, "%s/request", tmpdir);
rc = mkdir(requestDirName, 0700);
if (rc)
{
server_error (_F("Could not create temporary directory %s: %s", requestDirName, strerror (errno)));
goto cleanup;
}
snprintf (responseDirName, PATH_MAX, "%s/response", tmpdir);
rc = mkdir(responseDirName, 0700);
if (rc)
{
server_error (_F("Could not create temporary directory %s: %s", responseDirName, strerror (errno)));
goto cleanup;
}
// Set this early, since it gets used for errors to be returned to the client.
stapstderr = string(responseDirName) + "/stderr";
snprintf (responseFileName, PATH_MAX, "%s/response.zip", tmpdir);
/* Read data from the socket.
* If the user is requesting/requiring authentication, authenticate
* the socket. */
bytesRead = readDataFromSocket(sslSocket, requestFileName);
if (bytesRead < 0) // Error
goto cleanup;
if (bytesRead == 0) // No request -- not an error
{
secStatus = SECSuccess;
goto cleanup;
}
#if 0 /* Don't authenticate after each transaction */
if (REQUEST_CERT_ALL)
{
secStatus = authenticateSocket(sslSocket);
if (secStatus != SECSuccess)
goto cleanup;
}
#endif
/* Just before we do any kind of processing, we want to check that the request there will
* be enough memory to unzip the file. */
if (check_uncompressed_request_size(requestFileName))
{
goto cleanup;
}
/* Unzip the request. */
secStatus = SECFailure;
argv = { "unzip", "-q", "-d", requestDirName, requestFileName };
rc = stap_system (0, argv);
if (rc != 0)
{
server_error (_("Unable to extract client request"));
goto cleanup;
}
/* Handle the request zip file. An error therein should still result
in a response zip file (containing stderr etc.) so we don't have to
have a result code here. */
handleRequest(requestDirName, responseDirName, stapstderr);
/* Zip the response. */
int ziprc;
argv = { "zip", "-q", "-r", responseFileName, "." };
rc = spawn_and_wait (argv, &ziprc, NULL, NULL, NULL, responseDirName);
if (rc != PR_SUCCESS || ziprc != 0)
{
server_error (_("Unable to compress server response"));
goto cleanup;
}
secStatus = writeDataToSocket (sslSocket, responseFileName);
cleanup:
if (sslSocket)
if (PR_Close (sslSocket) != PR_SUCCESS)
{
server_error (_("Error closing ssl socket"));
nssError ();
}
if (tmpdir[0])
{
// Remove the whole tmpdir and all that lies beneath, unless -k was specified.
if (keep_temp)
log (_F("Keeping temporary directory %s", tmpdir));
else
{
argv = { "rm", "-r", tmpdir };
rc = stap_system (0, argv);
if (rc != 0)
server_error (_("Error in tmpdir cleanup"));
}
}
if (secStatus != SECSuccess)
server_error (_("Error processing client request"));
// Log the end of the request.
char buf[1024];
prStatus = PR_NetAddrToString (& addr, buf, sizeof (buf));
if (prStatus == PR_SUCCESS)
{
if (addr.raw.family == PR_AF_INET)
log (_F("Request from %s:%d complete", buf, addr.inet.port));
else if (addr.raw.family == PR_AF_INET6)
log (_F("Request from [%s]:%d complete", buf, addr.ipv6.port));
}
/* Increment semephore to indicate this thread is finished. */
free(t_arg);
if (max_threads > 0)
{
sem_post(&sem_client);
pthread_exit(0);
}
else
return 0;
}
/* Function: int accept_connection()
*
* Purpose: Accept a connection to the socket.
*
*/
static SECStatus
accept_connections (PRFileDesc *listenSocket, CERTCertificate *cert)
{
PRNetAddr addr;
PRFileDesc *tcpSocket;
PRStatus prStatus;
SECStatus secStatus;
CERTCertDBHandle *dbHandle;
pthread_t tid;
thread_arg *t_arg;
dbHandle = CERT_GetDefaultCertDB ();
// cert_db_path gets passed to nssPasswordCallback.
SECKEYPrivateKey *privKey = PK11_FindKeyByAnyCert (cert, (void*)cert_db_path.c_str ());
if (privKey == NULL)
{
server_error (_("Unable to obtain certificate private key"));
nssError ();
return SECFailure;
}
while (pending_interrupts == 0)
{
/* Accept a connection to the socket. */
tcpSocket = PR_Accept (listenSocket, &addr, PR_INTERVAL_MIN);
if (tcpSocket == NULL)
{
if(PR_GetError() == PR_IO_TIMEOUT_ERROR)
continue;
else
{
server_error (_("Error accepting client connection"));
break;
}
}
/* Log the accepted connection. */
char buf[1024];
prStatus = PR_NetAddrToString (&addr, buf, sizeof (buf));
if (prStatus == PR_SUCCESS)
{
if (addr.raw.family == PR_AF_INET)
log (_F("Accepted connection from %s:%d", buf, addr.inet.port));
else if (addr.raw.family == PR_AF_INET6)
log (_F("Accepted connection from [%s]:%d", buf, addr.ipv6.port));
}
/* XXX: alarm() or somesuch to set a timeout. */
/* Accepted the connection, now handle it. */
/* Wait for a thread to finish if there are none available */
if(max_threads >0)
{
int idle_threads;
sem_getvalue(&sem_client, &idle_threads);
if(idle_threads <= 0)
log(_("Server is overloaded. Processing times may be longer than normal."));
else if (idle_threads == max_threads)
log(_("Processing 1 request..."));
else
log(_F("Processing %d concurrent requests...", ((int)max_threads - idle_threads) + 1));
sem_wait(&sem_client);
}
/* Create the argument structure to pass to pthread_create
* (or directly to handle_connection if max_threads == 0 */
t_arg = (thread_arg *)malloc(sizeof(*t_arg));
if (t_arg == 0)
fatal(_("No memory available for new thread arg!"));
t_arg->tcpSocket = tcpSocket;
t_arg->cert = cert;
t_arg->privKey = privKey;
t_arg->addr = addr;
/* Handle the conncection */
if (max_threads > 0)
/* Create the worker thread and handle the connection. */
pthread_create(&tid, NULL, handle_connection, t_arg);
else
/* Since max_threads == 0, don't spawn a new thread,
* just handle in the current thread. */
handle_connection(t_arg);
// If our certificate is no longer valid (e.g. has expired), then exit.
secStatus = CERT_VerifyCertNow (dbHandle, cert, PR_TRUE/*checkSig*/,
certUsageSSLServer, NULL/*wincx*/);
if (secStatus != SECSuccess)
{
// Not an error. Exit the loop so a new cert can be generated.
break;
}
}
SECKEY_DestroyPrivateKey (privKey);
return SECSuccess;
}
/* Function: void server_main()
*
* Purpose: This is the server's main function. It configures a socket
* and listens to it.
*
*/
static SECStatus
server_main (PRFileDesc *listenSocket)
{
int idle_threads;
int timeout = 0;
// Initialize NSS.
SECStatus secStatus = nssInit (cert_db_path.c_str ());
if (secStatus != SECSuccess)
{
// Message already issued.
return secStatus;
}
// Preinitialized here due to jumps to the label 'done'.
CERTCertificate *cert = NULL;
bool serverCacheConfigured = false;
// Enable all cipher suites.
// NB: The NSS docs say that SSL_ClearSessionCache is required for the new settings to take
// effect, however, calling it puts NSS in a state where it will not shut down cleanly.
// We need to be able to shut down NSS cleanly if we are to generate a new certificate when
// ours expires. It should be noted however, thet SSL_ClearSessionCache only clears the
// client cache, and we are a server.
/* Some NSS versions don't do this correctly in NSS_SetDomesticPolicy. */
do {
const PRUint16 *cipher;
for (cipher = SSL_GetImplementedCiphers(); *cipher != 0; ++cipher)
SSL_CipherPolicySet(*cipher, SSL_ALLOWED);
} while (0);
// SSL_ClearSessionCache ();
// Configure the SSL session cache for a single process server with the default settings.
secStatus = SSL_ConfigServerSessionIDCache (0, 0, 0, NULL);
if (secStatus != SECSuccess)
{
server_error (_("Unable to configure SSL server session ID cache"));
nssError ();
goto done;
}
serverCacheConfigured = true;
/* Get own certificate. */
cert = PK11_FindCertFromNickname (server_cert_nickname (), NULL);
if (cert == NULL)
{
server_error (_F("Unable to find our certificate in the database at %s",
cert_db_path.c_str ()));
nssError ();
goto done;
}
// Tell the world that we're listening.
advertise_presence (cert);
/* Handle connections to the socket. */
secStatus = accept_connections (listenSocket, cert);
// Tell the world we're no longer listening.
unadvertise_presence ();
sem_getvalue(&sem_client, &idle_threads);
/* Wait for requests to finish or the timeout to be reached.
* If we got here from an interrupt, exit immediately if
* the timeout is reached. Otherwise, wait indefinitiely
* until the threads exit (or an interrupt is recieved).*/
if(idle_threads < max_threads)
log(_F("Waiting for %d outstanding requests to complete...", (int)max_threads - idle_threads));
while(idle_threads < max_threads)
{
if(pending_interrupts && timeout++ > CONCURRENCY_TIMEOUT_S)
{
log(_("Timeout reached, exiting (forced)"));
kill_stap_spawn (SIGTERM);
cleanup ();
_exit(0);
}
sleep(1);
sem_getvalue(&sem_client, &idle_threads);
}
done:
// Clean up
if (cert)
CERT_DestroyCertificate (cert);
// Shutdown NSS
if (serverCacheConfigured && SSL_ShutdownServerSessionIDCache () != SECSuccess)
{
server_error (_("Unable to shut down server session ID cache"));
nssError ();
}
nssCleanup (cert_db_path.c_str ());
return secStatus;
}
static void
listen ()
{
// Create a new socket.
PRFileDesc *listenSocket = PR_OpenTCPSocket (PR_AF_INET6); // Accepts IPv4 too
if (listenSocket == NULL)
{
server_error (_("Error creating socket"));
nssError ();
return;
}
// Set socket to be blocking - on some platforms the default is nonblocking.
PRSocketOptionData socketOption;
socketOption.option = PR_SockOpt_Nonblocking;
socketOption.value.non_blocking = PR_FALSE;
PRStatus prStatus = PR_SetSocketOption (listenSocket, & socketOption);
if (prStatus != PR_SUCCESS)
{
server_error (_("Error setting socket properties"));
nssError ();
goto done;
}
// Allow the socket address to be reused, in case we want the same port across a
// 'service stap-server restart'
socketOption.option = PR_SockOpt_Reuseaddr;
socketOption.value.reuse_addr = PR_TRUE;
prStatus = PR_SetSocketOption (listenSocket, & socketOption);
if (prStatus != PR_SUCCESS)
{
server_error (_("Error setting socket properties"));
nssError ();
goto done;
}
// Configure the network connection.
PRNetAddr addr;
memset (& addr, 0, sizeof(addr));
prStatus = PR_InitializeNetAddr (PR_IpAddrAny, port, & addr);
addr.ipv6.family = PR_AF_INET6;
#if 0
// addr.inet.ip = PR_htonl(PR_INADDR_ANY);
PR_StringToNetAddr ("::", & addr);
// PR_StringToNetAddr ("fe80::5eff:35ff:fe07:55ca", & addr);
// PR_StringToNetAddr ("::1", & addr);
addr.ipv6.port = PR_htons (port);
#endif
// Bind the socket to an address. Retry if the selected port is busy, unless the port was
// specified directly.
for (;;)
{
/* Bind the address to the listener socket. */
prStatus = PR_Bind (listenSocket, & addr);
if (prStatus == PR_SUCCESS)
break;
// If the selected port is busy. Try another, but only if a specific port was not specified.
PRErrorCode errorNumber = PR_GetError ();
switch (errorNumber)
{
case PR_ADDRESS_NOT_AVAILABLE_ERROR:
if (port == 0)
{
server_error (_F("Network port %hu is unavailable. Trying another port", port));
continue;
}
break;
case PR_ADDRESS_IN_USE_ERROR:
if (port == 0)
{
server_error (_F("Network port %hu is busy. Trying another port", port));
continue;
}
break;
default:
break;
}
server_error (_("Error setting socket address"));
nssError ();
goto done;
}
// Query the socket for the port that was assigned.
prStatus = PR_GetSockName (listenSocket, &addr);
if (prStatus != PR_SUCCESS)
{
server_error (_("Unable to obtain socket address"));
nssError ();
goto done;
}
char buf[1024];
prStatus = PR_NetAddrToString (&addr, buf, sizeof (buf));
port = PR_ntohs (addr.ipv6.port);
log (_F("Using network address [%s]:%hu", buf, port));
if (max_threads > 0)
log (_F("Using a maximum of %ld threads", max_threads));
else
log (_("Concurrency disabled"));
// Listen for connection on the socket. The second argument is the maximum size of the queue
// for pending connections.
prStatus = PR_Listen (listenSocket, 5);
if (prStatus != PR_SUCCESS)
{
server_error (_("Error listening on socket"));
nssError ();
goto done;
}
/* Initialize semephore with the maximum number of threads
* defined by --max-threads. If it is not defined, the
* default is the number of processors */
sem_init(&sem_client, 0, max_threads);
// Loop forever. We check our certificate (and regenerate, if necessary) and then start the
// server. The server will go down when our certificate is no longer valid (e.g. expired). We
// then generate a new one and start the server again.
while(!pending_interrupts)
{
// Ensure that our certificate is valid. Generate a new one if not.
if (check_cert (cert_db_path, server_cert_nickname (), use_db_password) != 0)
{
// Message already issued
goto done;
}
// Ensure that our certificate is trusted by our local client.
// Construct the client database path relative to the server database path.
SECStatus secStatus = add_client_cert (server_cert_file (),
local_client_cert_db_path ());
if (secStatus != SECSuccess)
{
// Not fatal. Other clients may trust the server and trust can be added
// for the local client in other ways.
server_error (_("Unable to authorize certificate for the local client"));
}
// Launch the server.
secStatus = server_main (listenSocket);
} // loop forever
done:
sem_destroy(&sem_client); /*Not really necessary, as we are shutting down...but for correctness */
if (PR_Close (listenSocket) != PR_SUCCESS)
{
server_error (_("Error closing listen socket"));
nssError ();
}
}
int
main (int argc, char **argv) {
initialize (argc, argv);
listen ();
cleanup ();
return 0;
}
/* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */
|