/* * qemud.c: daemon start of day, guest process & i/o management * * Copyright (C) 2006, 2007, 2008 Red Hat, Inc. * Copyright (C) 2006 Daniel P. Berrange * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Author: Daniel P. Berrange */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "libvirt_internal.h" #include "qemud.h" #include "util.h" #include "remote_internal.h" #include "conf.h" #include "event.h" #include "memory.h" #ifdef HAVE_AVAHI #include "mdns.h" #endif #ifdef WITH_DRIVER_MODULES #include "driver.h" #else #ifdef WITH_QEMU #include "qemu_driver.h" #endif #ifdef WITH_LXC #include "lxc_driver.h" #endif #ifdef WITH_UML #include "uml_driver.h" #endif #ifdef WITH_NETWORK #include "network_driver.h" #endif #ifdef WITH_STORAGE_DIR #include "storage_driver.h" #endif #ifdef WITH_NODE_DEVICES #include "node_device.h" #endif #endif static int godaemon = 0; /* -d: Be a daemon */ static int verbose = 0; /* -v: Verbose mode */ static int timeout = -1; /* -t: Shutdown timeout */ static int sigwrite = -1; /* Signal handler pipe */ static int ipsock = 0; /* -l Listen for TCP/IP */ /* Defaults for configuration file elements */ static int listen_tls = 1; static int listen_tcp = 0; static char *listen_addr = (char *) LIBVIRTD_LISTEN_ADDR; static char *tls_port = (char *) LIBVIRTD_TLS_PORT; static char *tcp_port = (char *) LIBVIRTD_TCP_PORT; static gid_t unix_sock_gid = 0; /* Only root by default */ static int unix_sock_rw_mask = 0700; /* Allow user only */ static int unix_sock_ro_mask = 0777; /* Allow world */ #if HAVE_POLKIT static int auth_unix_rw = REMOTE_AUTH_POLKIT; static int auth_unix_ro = REMOTE_AUTH_POLKIT; #else static int auth_unix_rw = REMOTE_AUTH_NONE; static int auth_unix_ro = REMOTE_AUTH_NONE; #endif /* HAVE_POLKIT */ #if HAVE_SASL static int auth_tcp = REMOTE_AUTH_SASL; #else static int auth_tcp = REMOTE_AUTH_NONE; #endif static int auth_tls = REMOTE_AUTH_NONE; static int mdns_adv = 1; static char *mdns_name = NULL; static int tls_no_verify_certificate = 0; static char **tls_allowed_dn_list = NULL; static char *key_file = (char *) LIBVIRT_SERVERKEY; static char *cert_file = (char *) LIBVIRT_SERVERCERT; static char *ca_file = (char *) LIBVIRT_CACERT; static char *crl_file = (char *) ""; static gnutls_certificate_credentials_t x509_cred; static gnutls_dh_params_t dh_params; #define DH_BITS 1024 static sig_atomic_t sig_errors = 0; static int sig_lasterrno = 0; static void sig_handler(int sig, siginfo_t * siginfo, void* context ATTRIBUTE_UNUSED) { int origerrno; int r; /* set the sig num in the struct */ siginfo->si_signo = sig; origerrno = errno; r = safewrite(sigwrite, siginfo, sizeof(*siginfo)); if (r == -1) { sig_errors++; sig_lasterrno = errno; } errno = origerrno; } static void qemudDispatchClientEvent(int watch, int fd, int events, void *opaque); static void qemudDispatchServerEvent(int watch, int fd, int events, void *opaque); static int qemudRegisterClientEvent(struct qemud_server *server, struct qemud_client *client, int removeFirst); static int remoteCheckCertFile(const char *type, const char *file) { struct stat sb; if (stat(file, &sb) < 0) { qemudLog (QEMUD_ERR, _("Cannot access %s '%s': %s (%d)"), type, file, strerror(errno), errno); return -1; } return 0; } static int remoteInitializeGnuTLS (void) { int err; /* Initialise GnuTLS. */ gnutls_global_init (); err = gnutls_certificate_allocate_credentials (&x509_cred); if (err) { qemudLog (QEMUD_ERR, _("gnutls_certificate_allocate_credentials: %s"), gnutls_strerror (err)); return -1; } if (ca_file && ca_file[0] != '\0') { if (remoteCheckCertFile("CA certificate", ca_file) < 0) return -1; qemudDebug ("loading CA cert from %s", ca_file); err = gnutls_certificate_set_x509_trust_file (x509_cred, ca_file, GNUTLS_X509_FMT_PEM); if (err < 0) { qemudLog (QEMUD_ERR, _("gnutls_certificate_set_x509_trust_file: %s"), gnutls_strerror (err)); return -1; } } if (crl_file && crl_file[0] != '\0') { if (remoteCheckCertFile("CA revocation list", crl_file) < 0) return -1; qemudDebug ("loading CRL from %s", crl_file); err = gnutls_certificate_set_x509_crl_file (x509_cred, crl_file, GNUTLS_X509_FMT_PEM); if (err < 0) { qemudLog (QEMUD_ERR, _("gnutls_certificate_set_x509_crl_file: %s"), gnutls_strerror (err)); return -1; } } if (cert_file && cert_file[0] != '\0' && key_file && key_file[0] != '\0') { if (remoteCheckCertFile("server certificate", cert_file) < 0) return -1; if (remoteCheckCertFile("server key", key_file) < 0) return -1; qemudDebug ("loading cert and key from %s and %s", cert_file, key_file); err = gnutls_certificate_set_x509_key_file (x509_cred, cert_file, key_file, GNUTLS_X509_FMT_PEM); if (err < 0) { qemudLog (QEMUD_ERR, _("gnutls_certificate_set_x509_key_file: %s"), gnutls_strerror (err)); return -1; } } /* Generate Diffie Hellman parameters - for use with DHE * kx algorithms. These should be discarded and regenerated * once a day, once a week or once a month. Depending on the * security requirements. */ err = gnutls_dh_params_init (&dh_params); if (err < 0) { qemudLog (QEMUD_ERR, _("gnutls_dh_params_init: %s"), gnutls_strerror (err)); return -1; } err = gnutls_dh_params_generate2 (dh_params, DH_BITS); if (err < 0) { qemudLog (QEMUD_ERR, _("gnutls_dh_params_generate2: %s"), gnutls_strerror (err)); return -1; } gnutls_certificate_set_dh_params (x509_cred, dh_params); return 0; } static void qemudDispatchSignalEvent(int watch ATTRIBUTE_UNUSED, int fd ATTRIBUTE_UNUSED, int events ATTRIBUTE_UNUSED, void *opaque) { struct qemud_server *server = (struct qemud_server *)opaque; siginfo_t siginfo; int ret; if (saferead(server->sigread, &siginfo, sizeof(siginfo)) != sizeof(siginfo)) { qemudLog(QEMUD_ERR, _("Failed to read from signal pipe: %s"), strerror(errno)); return; } ret = 0; switch (siginfo.si_signo) { case SIGHUP: qemudLog(QEMUD_INFO, "%s", _("Reloading configuration on SIGHUP")); if (virStateReload() < 0) qemudLog(QEMUD_WARN, "%s", _("Error while reloading drivers")); break; case SIGINT: case SIGQUIT: case SIGTERM: qemudLog(QEMUD_WARN, _("Shutting down on signal %d"), siginfo.si_signo); server->shutdown = 1; break; default: qemudLog(QEMUD_INFO, _("Received unexpected signal %d"), siginfo.si_signo); break; } if (ret != 0) server->shutdown = 1; } static int qemudSetCloseExec(int fd) { int flags; if ((flags = fcntl(fd, F_GETFD)) < 0) goto error; flags |= FD_CLOEXEC; if ((fcntl(fd, F_SETFD, flags)) < 0) goto error; return 0; error: qemudLog(QEMUD_ERR, "%s", _("Failed to set close-on-exec file descriptor flag")); return -1; } static int qemudSetNonBlock(int fd) { int flags; if ((flags = fcntl(fd, F_GETFL)) < 0) goto error; flags |= O_NONBLOCK; if ((fcntl(fd, F_SETFL, flags)) < 0) goto error; return 0; error: qemudLog(QEMUD_ERR, "%s", _("Failed to set non-blocking file descriptor flag")); return -1; } void qemudLog(int priority, const char *fmt, ...) { va_list args; va_start(args, fmt); if (godaemon) { int sysprio = -1; switch(priority) { case QEMUD_ERR: sysprio = LOG_ERR; break; case QEMUD_WARN: sysprio = LOG_WARNING; break; case QEMUD_INFO: if (verbose) sysprio = LOG_INFO; break; #ifdef ENABLE_DEBUG case QEMUD_DEBUG: if (verbose) sysprio = LOG_DEBUG; break; #endif default: break; } if (sysprio != -1) vsyslog(sysprio, fmt, args); } else { switch(priority) { case QEMUD_ERR: case QEMUD_WARN: vfprintf(stderr, fmt, args); fputc('\n', stderr); break; case QEMUD_INFO: if (verbose) { vprintf(fmt, args); fputc('\n', stdout); } break; #ifdef ENABLE_DEBUG case QEMUD_DEBUG: if (verbose) { vprintf(fmt, args); fputc('\n', stdout); } break; #endif default: break; } } va_end(args); } static int qemudGoDaemon(void) { int pid = fork(); switch (pid) { case 0: { int stdinfd = -1; int stdoutfd = -1; int nextpid; if ((stdinfd = open(_PATH_DEVNULL, O_RDONLY)) < 0) goto cleanup; if ((stdoutfd = open(_PATH_DEVNULL, O_WRONLY)) < 0) goto cleanup; if (dup2(stdinfd, STDIN_FILENO) != STDIN_FILENO) goto cleanup; if (dup2(stdoutfd, STDOUT_FILENO) != STDOUT_FILENO) goto cleanup; if (dup2(stdoutfd, STDERR_FILENO) != STDERR_FILENO) goto cleanup; if (close(stdinfd) < 0) goto cleanup; stdinfd = -1; if (close(stdoutfd) < 0) goto cleanup; stdoutfd = -1; if (setsid() < 0) goto cleanup; nextpid = fork(); switch (nextpid) { case 0: return 0; case -1: return -1; default: _exit(0); } cleanup: if (stdoutfd != -1) close(stdoutfd); if (stdinfd != -1) close(stdinfd); return -1; } case -1: return -1; default: { int got, status = 0; /* We wait to make sure the next child forked successfully */ if ((got = waitpid(pid, &status, 0)) < 0 || got != pid || status != 0) { return -1; } _exit(0); } } } static int qemudWritePidFile(const char *pidFile) { int fd; FILE *fh; if (pidFile[0] == '\0') return 0; if ((fd = open(pidFile, O_WRONLY|O_CREAT|O_EXCL, 0644)) < 0) { qemudLog(QEMUD_ERR, _("Failed to open pid file '%s' : %s"), pidFile, strerror(errno)); return -1; } if (!(fh = fdopen(fd, "w"))) { qemudLog(QEMUD_ERR, _("Failed to fdopen pid file '%s' : %s"), pidFile, strerror(errno)); close(fd); return -1; } if (fprintf(fh, "%lu\n", (unsigned long)getpid()) < 0) { qemudLog(QEMUD_ERR, _("Failed to write to pid file '%s' : %s"), pidFile, strerror(errno)); close(fd); return -1; } if (fclose(fh) == EOF) { qemudLog(QEMUD_ERR, _("Failed to close pid file '%s' : %s"), pidFile, strerror(errno)); return -1; } return 0; } static int qemudListenUnix(struct qemud_server *server, const char *path, int readonly, int auth) { struct qemud_socket *sock; struct sockaddr_un addr; mode_t oldmask; gid_t oldgrp; if (VIR_ALLOC(sock) < 0) { qemudLog(QEMUD_ERR, "%s", _("Failed to allocate memory for struct qemud_socket")); return -1; } sock->readonly = readonly; sock->port = -1; sock->type = QEMUD_SOCK_TYPE_UNIX; sock->auth = auth; if ((sock->fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { qemudLog(QEMUD_ERR, _("Failed to create socket: %s"), strerror(errno)); goto cleanup; } if (qemudSetCloseExec(sock->fd) < 0 || qemudSetNonBlock(sock->fd) < 0) goto cleanup; memset(&addr, 0, sizeof(addr)); addr.sun_family = AF_UNIX; strncpy(addr.sun_path, path, sizeof(addr.sun_path)-1); if (addr.sun_path[0] == '@') addr.sun_path[0] = '\0'; oldgrp = getgid(); oldmask = umask(readonly ? ~unix_sock_ro_mask : ~unix_sock_rw_mask); if (getuid() == 0) setgid(unix_sock_gid); if (bind(sock->fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) { qemudLog(QEMUD_ERR, _("Failed to bind socket to '%s': %s"), path, strerror(errno)); goto cleanup; } umask(oldmask); if (getuid() == 0) setgid(oldgrp); if (listen(sock->fd, 30) < 0) { qemudLog(QEMUD_ERR, _("Failed to listen for connections on '%s': %s"), path, strerror(errno)); goto cleanup; } if ((sock->watch = virEventAddHandleImpl(sock->fd, VIR_EVENT_HANDLE_READABLE | VIR_EVENT_HANDLE_ERROR | VIR_EVENT_HANDLE_HANGUP, qemudDispatchServerEvent, server, NULL)) < 0) { qemudLog(QEMUD_ERR, "%s", _("Failed to add server event callback")); goto cleanup; } sock->next = server->sockets; server->sockets = sock; server->nsockets++; return 0; cleanup: if (sock->fd) close(sock->fd); free(sock); return -1; } // See: http://people.redhat.com/drepper/userapi-ipv6.html static int remoteMakeSockets (int *fds, int max_fds, int *nfds_r, const char *node, const char *service) { struct addrinfo *ai; struct addrinfo hints; memset (&hints, 0, sizeof hints); hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG; hints.ai_socktype = SOCK_STREAM; int e = getaddrinfo (node, service, &hints, &ai); if (e != 0) { qemudLog (QEMUD_ERR, _("getaddrinfo: %s\n"), gai_strerror (e)); return -1; } struct addrinfo *runp = ai; while (runp && *nfds_r < max_fds) { fds[*nfds_r] = socket (runp->ai_family, runp->ai_socktype, runp->ai_protocol); if (fds[*nfds_r] == -1) { qemudLog (QEMUD_ERR, _("socket: %s"), strerror (errno)); return -1; } int opt = 1; setsockopt (fds[*nfds_r], SOL_SOCKET, SO_REUSEADDR, &opt, sizeof opt); if (bind (fds[*nfds_r], runp->ai_addr, runp->ai_addrlen) == -1) { if (errno != EADDRINUSE) { qemudLog (QEMUD_ERR, _("bind: %s"), strerror (errno)); return -1; } close (fds[*nfds_r]); } else { if (listen (fds[*nfds_r], SOMAXCONN) == -1) { qemudLog (QEMUD_ERR, _("listen: %s"), strerror (errno)); return -1; } ++*nfds_r; } runp = runp->ai_next; } freeaddrinfo (ai); return 0; } /* Listen on the named/numbered TCP port. On a machine with IPv4 and * IPv6 interfaces this may generate several sockets. */ static int remoteListenTCP (struct qemud_server *server, const char *addr, const char *port, int type, int auth) { int fds[2]; int nfds = 0; int i; struct qemud_socket *sock; if (remoteMakeSockets (fds, 2, &nfds, addr, port) == -1) return -1; for (i = 0; i < nfds; ++i) { struct sockaddr_storage sa; socklen_t salen = sizeof(sa); if (VIR_ALLOC(sock) < 0) { qemudLog (QEMUD_ERR, _("remoteListenTCP: calloc: %s"), strerror (errno)); goto cleanup; } sock->readonly = 0; sock->next = server->sockets; server->sockets = sock; server->nsockets++; sock->fd = fds[i]; sock->type = type; sock->auth = auth; if (getsockname(sock->fd, (struct sockaddr *)(&sa), &salen) < 0) goto cleanup; if (sa.ss_family == AF_INET) sock->port = htons(((struct sockaddr_in*)&sa)->sin_port); #ifdef AF_INET6 else if (sa.ss_family == AF_INET6) sock->port = htons(((struct sockaddr_in6*)&sa)->sin6_port); #endif else sock->port = -1; if (qemudSetCloseExec(sock->fd) < 0 || qemudSetNonBlock(sock->fd) < 0) goto cleanup; if (listen (sock->fd, 30) < 0) { qemudLog (QEMUD_ERR, _("remoteListenTCP: listen: %s"), strerror (errno)); goto cleanup; } if ((sock->watch = virEventAddHandleImpl(sock->fd, VIR_EVENT_HANDLE_READABLE | VIR_EVENT_HANDLE_ERROR | VIR_EVENT_HANDLE_HANGUP, qemudDispatchServerEvent, server, NULL)) < 0) { qemudLog(QEMUD_ERR, "%s", _("Failed to add server event callback")); goto cleanup; } } return 0; cleanup: for (i = 0; i < nfds; ++i) close(fds[0]); return -1; } static int qemudInitPaths(struct qemud_server *server, char *sockname, char *roSockname, int maxlen) { uid_t uid = geteuid(); if (!uid) { if (snprintf (sockname, maxlen, "%s/run/libvirt/libvirt-sock", LOCAL_STATE_DIR) >= maxlen) goto snprintf_error; unlink(sockname); if (snprintf (roSockname, maxlen, "%s/run/libvirt/libvirt-sock-ro", LOCAL_STATE_DIR) >= maxlen) goto snprintf_error; unlink(roSockname); if (snprintf(server->logDir, PATH_MAX, "%s/log/libvirt/", LOCAL_STATE_DIR) >= PATH_MAX) goto snprintf_error; } else { struct passwd *pw; if (!(pw = getpwuid(uid))) { qemudLog(QEMUD_ERR, _("Failed to find user record for uid '%d': %s"), uid, strerror(errno)); return -1; } if (snprintf(sockname, maxlen, "@%s/.libvirt/libvirt-sock", pw->pw_dir) >= maxlen) goto snprintf_error; if (snprintf(server->logDir, PATH_MAX, "%s/.libvirt/log", pw->pw_dir) >= PATH_MAX) goto snprintf_error; } /* !remote */ return 0; snprintf_error: qemudLog(QEMUD_ERR, "%s", _("Resulting path too long for buffer in qemudInitPaths()")); return -1; } static struct qemud_server *qemudInitialize(int sigread) { struct qemud_server *server; if (VIR_ALLOC(server) < 0) { qemudLog(QEMUD_ERR, "%s", _("Failed to allocate struct qemud_server")); return NULL; } server->sigread = sigread; virInitialize(); #ifdef WITH_DRIVER_MODULES /* We don't care if any of these fail, because the whole point * is to allow users to only install modules they want to use. * If they try to use a open a connection for a module that * is not loaded they'll get a suitable error at that point */ virDriverLoadModule("qemu"); virDriverLoadModule("lxc"); virDriverLoadModule("uml"); virDriverLoadModule("network"); virDriverLoadModule("storage"); virDriverLoadModule("nodedev"); #else #ifdef WITH_QEMU qemuRegister(); #endif #ifdef WITH_LXC lxcRegister(); #endif #ifdef WITH_UML umlRegister(); #endif #ifdef WITH_NETWORK networkRegister(); #endif #ifdef WITH_STORAGE_DIR storageRegister(); #endif #if defined(HAVE_HAL) || defined(HAVE_DEVKIT) nodedevRegister(); #endif #endif virEventRegisterImpl(virEventAddHandleImpl, virEventUpdateHandleImpl, virEventRemoveHandleImpl, virEventAddTimeoutImpl, virEventUpdateTimeoutImpl, virEventRemoveTimeoutImpl); virStateInitialize(); return server; } static struct qemud_server *qemudNetworkInit(struct qemud_server *server) { struct qemud_socket *sock; char sockname[PATH_MAX]; char roSockname[PATH_MAX]; #if HAVE_SASL int err; #endif /* HAVE_SASL */ roSockname[0] = '\0'; if (qemudInitPaths(server, sockname, roSockname, PATH_MAX) < 0) goto cleanup; if (qemudListenUnix(server, sockname, 0, auth_unix_rw) < 0) goto cleanup; if (roSockname[0] != '\0' && qemudListenUnix(server, roSockname, 1, auth_unix_ro) < 0) goto cleanup; #if HAVE_SASL if (auth_unix_rw == REMOTE_AUTH_SASL || auth_unix_ro == REMOTE_AUTH_SASL || auth_tcp == REMOTE_AUTH_SASL || auth_tls == REMOTE_AUTH_SASL) { if ((err = sasl_server_init(NULL, "libvirt")) != SASL_OK) { qemudLog(QEMUD_ERR, _("Failed to initialize SASL authentication %s"), sasl_errstring(err, NULL, NULL)); goto cleanup; } } #endif #ifdef HAVE_POLKIT if (auth_unix_rw == REMOTE_AUTH_POLKIT || auth_unix_ro == REMOTE_AUTH_POLKIT) { DBusError derr; dbus_error_init(&derr); server->sysbus = dbus_bus_get(DBUS_BUS_SYSTEM, &derr); if (!(server->sysbus)) { qemudLog(QEMUD_ERR, _("Failed to connect to system bus for PolicyKit auth: %s"), derr.message); dbus_error_free(&derr); goto cleanup; } } #endif if (ipsock) { if (listen_tcp && remoteListenTCP (server, listen_addr, tcp_port, QEMUD_SOCK_TYPE_TCP, auth_tcp) < 0) goto cleanup; if (listen_tls) { if (remoteInitializeGnuTLS () < 0) goto cleanup; if (remoteListenTCP (server, listen_addr, tls_port, QEMUD_SOCK_TYPE_TLS, auth_tls) < 0) goto cleanup; } } #ifdef HAVE_AVAHI if (getuid() == 0 && mdns_adv) { struct libvirtd_mdns_group *group; int port = 0; server->mdns = libvirtd_mdns_new(); if (!mdns_name) { char groupname[64], localhost[HOST_NAME_MAX+1], *tmp; /* Extract the host part of the potentially FQDN */ gethostname(localhost, HOST_NAME_MAX); localhost[HOST_NAME_MAX] = '\0'; if ((tmp = strchr(localhost, '.'))) *tmp = '\0'; snprintf(groupname, sizeof(groupname)-1, "Virtualization Host %s", localhost); groupname[sizeof(groupname)-1] = '\0'; group = libvirtd_mdns_add_group(server->mdns, groupname); } else { group = libvirtd_mdns_add_group(server->mdns, mdns_name); } /* * See if there's a TLS enabled port we can advertise. Cowardly * don't bother to advertise TCP since we don't want people using * them for real world apps */ sock = server->sockets; while (sock) { if (sock->port != -1 && sock->type == QEMUD_SOCK_TYPE_TLS) { port = sock->port; break; } sock = sock->next; } /* * Add the primary entry - we choose SSH because its most likely to always * be available */ libvirtd_mdns_add_entry(group, "_libvirt._tcp", port); libvirtd_mdns_start(server->mdns); } #endif return server; cleanup: if (server) { sock = server->sockets; while (sock) { close(sock->fd); sock = sock->next; } #ifdef HAVE_POLKIT if (server->sysbus) dbus_connection_unref(server->sysbus); #endif free(server); } return NULL; } static gnutls_session_t remoteInitializeTLSSession (void) { gnutls_session_t session; int err; err = gnutls_init (&session, GNUTLS_SERVER); if (err != 0) goto failed; /* avoid calling all the priority functions, since the defaults * are adequate. */ err = gnutls_set_default_priority (session); if (err != 0) goto failed; err = gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, x509_cred); if (err != 0) goto failed; /* request client certificate if any. */ gnutls_certificate_server_set_request (session, GNUTLS_CERT_REQUEST); gnutls_dh_set_prime_bits (session, DH_BITS); return session; failed: qemudLog (QEMUD_ERR, _("remoteInitializeTLSSession: %s"), gnutls_strerror (err)); return NULL; } /* Check DN is on tls_allowed_dn_list. */ static int remoteCheckDN (gnutls_x509_crt_t cert) { char name[256]; size_t namesize = sizeof name; char **wildcards; int err; err = gnutls_x509_crt_get_dn (cert, name, &namesize); if (err != 0) { qemudLog (QEMUD_ERR, _("remoteCheckDN: gnutls_x509_cert_get_dn: %s"), gnutls_strerror (err)); return 0; } /* If the list is not set, allow any DN. */ wildcards = tls_allowed_dn_list; if (!wildcards) return 1; while (*wildcards) { if (fnmatch (*wildcards, name, 0) == 0) return 1; wildcards++; } #ifdef ENABLE_DEBUG /* Print the client's DN. */ qemudLog (QEMUD_DEBUG, _("remoteCheckDN: failed: client DN is %s"), name); #endif return 0; // Not found. } static int remoteCheckCertificate (gnutls_session_t session) { int ret; unsigned int status; const gnutls_datum_t *certs; unsigned int nCerts, i; time_t now; if ((ret = gnutls_certificate_verify_peers2 (session, &status)) < 0){ qemudLog (QEMUD_ERR, _("remoteCheckCertificate: verify failed: %s"), gnutls_strerror (ret)); return -1; } if (status != 0) { if (status & GNUTLS_CERT_INVALID) qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: " "the client certificate is not trusted.")); if (status & GNUTLS_CERT_SIGNER_NOT_FOUND) qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: the client " "certificate has unknown issuer.")); if (status & GNUTLS_CERT_REVOKED) qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: " "the client certificate has been revoked.")); #ifndef GNUTLS_1_0_COMPAT if (status & GNUTLS_CERT_INSECURE_ALGORITHM) qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: the client certificate" " uses an insecure algorithm.")); #endif return -1; } if (gnutls_certificate_type_get (session) != GNUTLS_CRT_X509) { qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: certificate is not X.509")); return -1; } if (!(certs = gnutls_certificate_get_peers(session, &nCerts))) { qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: no peers")); return -1; } now = time (NULL); for (i = 0; i < nCerts; i++) { gnutls_x509_crt_t cert; if (gnutls_x509_crt_init (&cert) < 0) { qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: gnutls_x509_crt_init failed")); return -1; } if (gnutls_x509_crt_import(cert, &certs[i], GNUTLS_X509_FMT_DER) < 0) { gnutls_x509_crt_deinit (cert); return -1; } if (gnutls_x509_crt_get_expiration_time (cert) < now) { qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: " "the client certificate has expired")); gnutls_x509_crt_deinit (cert); return -1; } if (gnutls_x509_crt_get_activation_time (cert) > now) { qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: the client " "certificate is not yet activated")); gnutls_x509_crt_deinit (cert); return -1; } if (i == 0) { if (!remoteCheckDN (cert)) { /* This is the most common error: make it informative. */ qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: client's Distinguished Name is not on the list of allowed clients (tls_allowed_dn_list). Use 'openssl x509 -in clientcert.pem -text' to view the Distinguished Name field in the client certificate, or run this daemon with --verbose option.")); gnutls_x509_crt_deinit (cert); return -1; } } } return 0; } /* Check the client's access. */ static int remoteCheckAccess (struct qemud_client *client) { /* Verify client certificate. */ if (remoteCheckCertificate (client->tlssession) == -1) { qemudLog (QEMUD_ERR, "%s", _("remoteCheckCertificate: " "failed to verify client's certificate")); if (!tls_no_verify_certificate) return -1; else qemudLog (QEMUD_INFO, "%s", _("remoteCheckCertificate: tls_no_verify_certificate " "is set so the bad certificate is ignored")); } /* Checks have succeeded. Write a '\1' byte back to the client to * indicate this (otherwise the socket is abruptly closed). * (NB. The '\1' byte is sent in an encrypted record). */ client->bufferLength = 1; client->bufferOffset = 0; client->buffer[0] = '\1'; client->mode = QEMUD_MODE_TX_PACKET; return 0; } #if HAVE_POLKIT int qemudGetSocketIdentity(int fd, uid_t *uid, pid_t *pid) { #ifdef SO_PEERCRED struct ucred cr; unsigned int cr_len = sizeof (cr); if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) < 0) { qemudLog(QEMUD_ERR, _("Failed to verify client credentials: %s"), strerror(errno)); return -1; } *pid = cr.pid; *uid = cr.uid; #else /* XXX Many more OS support UNIX socket credentials we could port to. See dbus ....*/ #error "UNIX socket credentials not supported/implemented on this platform yet..." #endif return 0; } #endif static int qemudDispatchServer(struct qemud_server *server, struct qemud_socket *sock) { int fd; struct sockaddr_storage addr; socklen_t addrlen = (socklen_t) (sizeof addr); struct qemud_client *client; int no_slow_start = 1; if ((fd = accept(sock->fd, (struct sockaddr *)&addr, &addrlen)) < 0) { if (errno == EAGAIN) return 0; qemudLog(QEMUD_ERR, _("Failed to accept connection: %s"), strerror(errno)); return -1; } /* Disable Nagle. Unix sockets will ignore this. */ setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, (void *)&no_slow_start, sizeof no_slow_start); if (qemudSetCloseExec(fd) < 0 || qemudSetNonBlock(fd) < 0) { close(fd); return -1; } if (VIR_ALLOC(client) < 0) goto cleanup; client->magic = QEMUD_CLIENT_MAGIC; client->fd = fd; client->readonly = sock->readonly; client->type = sock->type; client->auth = sock->auth; memcpy (&client->addr, &addr, sizeof addr); client->addrlen = addrlen; client->server = server; #if HAVE_POLKIT /* Only do policy checks for non-root - allow root user through with no checks, as a fail-safe - root can easily change policykit policy anyway, so its pointless trying to restrict root */ if (client->auth == REMOTE_AUTH_POLKIT) { uid_t uid; pid_t pid; if (qemudGetSocketIdentity(client->fd, &uid, &pid) < 0) goto cleanup; /* Client is running as root, so disable auth */ if (uid == 0) { qemudLog(QEMUD_INFO, _("Turn off polkit auth for privileged client %d"), pid); client->auth = REMOTE_AUTH_NONE; } } #endif if (client->type != QEMUD_SOCK_TYPE_TLS) { client->mode = QEMUD_MODE_RX_HEADER; client->bufferLength = REMOTE_MESSAGE_HEADER_XDR_LEN; if (qemudRegisterClientEvent (server, client, 0) < 0) goto cleanup; } else { int ret; client->tlssession = remoteInitializeTLSSession (); if (client->tlssession == NULL) goto cleanup; gnutls_transport_set_ptr (client->tlssession, (gnutls_transport_ptr_t) (long) fd); /* Begin the TLS handshake. */ ret = gnutls_handshake (client->tlssession); if (ret == 0) { /* Unlikely, but ... Next step is to check the certificate. */ if (remoteCheckAccess (client) == -1) goto cleanup; if (qemudRegisterClientEvent(server, client, 0) < 0) goto cleanup; } else if (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN) { /* Most likely. */ client->mode = QEMUD_MODE_TLS_HANDSHAKE; client->bufferLength = -1; if (qemudRegisterClientEvent (server, client, 0) < 0) goto cleanup; } else { qemudLog (QEMUD_ERR, _("TLS handshake failed: %s"), gnutls_strerror (ret)); goto cleanup; } } client->next = server->clients; server->clients = client; server->nclients++; return 0; cleanup: if (client->tlssession) gnutls_deinit (client->tlssession); close (fd); free (client); return -1; } static void qemudDispatchClientFailure(struct qemud_server *server, struct qemud_client *client) { struct qemud_client *tmp = server->clients; struct qemud_client *prev = NULL; while (tmp) { if (tmp == client) { if (prev == NULL) server->clients = client->next; else prev->next = client->next; server->nclients--; break; } prev = tmp; tmp = tmp->next; } virEventRemoveHandleImpl(client->watch); /* Deregister event delivery callback */ if(client->conn) { qemudDebug("Deregistering to relay remote events"); virConnectDomainEventDeregister(client->conn, remoteRelayDomainEvent); } if (client->conn) virConnectClose(client->conn); #if HAVE_SASL if (client->saslconn) sasl_dispose(&client->saslconn); free(client->saslUsername); #endif if (client->tlssession) gnutls_deinit (client->tlssession); close(client->fd); free(client); } static int qemudClientReadBuf(struct qemud_server *server, struct qemud_client *client, char *data, unsigned len) { int ret; /*qemudDebug ("qemudClientRead: len = %d", len);*/ if (!client->tlssession) { if ((ret = read (client->fd, data, len)) <= 0) { if (ret == 0 || errno != EAGAIN) { if (ret != 0) qemudLog (QEMUD_ERR, _("read: %s"), strerror (errno)); qemudDispatchClientFailure(server, client); } return -1; } } else { ret = gnutls_record_recv (client->tlssession, data, len); if (qemudRegisterClientEvent (server, client, 1) < 0) qemudDispatchClientFailure (server, client); else if (ret <= 0) { if (ret == 0 || (ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)) { if (ret != 0) qemudLog (QEMUD_ERR, _("gnutls_record_recv: %s"), gnutls_strerror (ret)); qemudDispatchClientFailure (server, client); } return -1; } } return ret; } static int qemudClientReadPlain(struct qemud_server *server, struct qemud_client *client) { int ret; ret = qemudClientReadBuf(server, client, client->buffer + client->bufferOffset, client->bufferLength - client->bufferOffset); if (ret < 0) return ret; client->bufferOffset += ret; return 0; } #if HAVE_SASL static int qemudClientReadSASL(struct qemud_server *server, struct qemud_client *client) { int got, want; /* We're doing a SSF data read, so now its times to ensure * future writes are under SSF too. * * cf remoteSASLCheckSSF in remote.c */ client->saslSSF |= QEMUD_SASL_SSF_WRITE; /* Need to read some more data off the wire */ if (client->saslDecoded == NULL) { char encoded[8192]; int encodedLen = sizeof(encoded); encodedLen = qemudClientReadBuf(server, client, encoded, encodedLen); if (encodedLen < 0) return -1; sasl_decode(client->saslconn, encoded, encodedLen, &client->saslDecoded, &client->saslDecodedLength); client->saslDecodedOffset = 0; } /* Some buffered decoded data to return now */ got = client->saslDecodedLength - client->saslDecodedOffset; want = client->bufferLength - client->bufferOffset; if (want > got) want = got; memcpy(client->buffer + client->bufferOffset, client->saslDecoded + client->saslDecodedOffset, want); client->saslDecodedOffset += want; client->bufferOffset += want; if (client->saslDecodedOffset == client->saslDecodedLength) { client->saslDecoded = NULL; client->saslDecodedOffset = client->saslDecodedLength = 0; } return 0; } #endif static int qemudClientRead(struct qemud_server *server, struct qemud_client *client) { #if HAVE_SASL if (client->saslSSF & QEMUD_SASL_SSF_READ) return qemudClientReadSASL(server, client); else #endif return qemudClientReadPlain(server, client); } static void qemudDispatchClientRead(struct qemud_server *server, struct qemud_client *client) { /*qemudDebug ("qemudDispatchClientRead: mode = %d", client->mode);*/ switch (client->mode) { case QEMUD_MODE_RX_HEADER: { XDR x; unsigned int len; if (qemudClientRead(server, client) < 0) return; /* Error, or blocking */ if (client->bufferOffset < client->bufferLength) return; /* Not read enough */ xdrmem_create(&x, client->buffer, client->bufferLength, XDR_DECODE); if (!xdr_u_int(&x, &len)) { xdr_destroy (&x); qemudDebug("Failed to decode packet length"); qemudDispatchClientFailure(server, client); return; } xdr_destroy (&x); if (len > REMOTE_MESSAGE_MAX) { qemudDebug("Packet length %u too large", len); qemudDispatchClientFailure(server, client); return; } /* Length include length of the length field itself, so * check minimum size requirements */ if (len <= REMOTE_MESSAGE_HEADER_XDR_LEN) { qemudDebug("Packet length %u too small", len); qemudDispatchClientFailure(server, client); return; } client->mode = QEMUD_MODE_RX_PAYLOAD; client->bufferLength = len - REMOTE_MESSAGE_HEADER_XDR_LEN; client->bufferOffset = 0; if (qemudRegisterClientEvent(server, client, 1) < 0) { qemudDispatchClientFailure(server, client); return; } /* Fall through */ } case QEMUD_MODE_RX_PAYLOAD: { if (qemudClientRead(server, client) < 0) return; /* Error, or blocking */ if (client->bufferOffset < client->bufferLength) return; /* Not read enough */ remoteDispatchClientRequest (server, client); if (qemudRegisterClientEvent(server, client, 1) < 0) qemudDispatchClientFailure(server, client); break; } case QEMUD_MODE_TLS_HANDSHAKE: { int ret; /* Continue the handshake. */ ret = gnutls_handshake (client->tlssession); if (ret == 0) { /* Finished. Next step is to check the certificate. */ if (remoteCheckAccess (client) == -1) qemudDispatchClientFailure (server, client); else if (qemudRegisterClientEvent (server, client, 1) < 0) qemudDispatchClientFailure (server, client); } else if (ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED) { qemudLog (QEMUD_ERR, _("TLS handshake failed: %s"), gnutls_strerror (ret)); qemudDispatchClientFailure (server, client); } else { if (qemudRegisterClientEvent (server ,client, 1) < 0) qemudDispatchClientFailure (server, client); } break; } default: qemudDebug("Got unexpected data read while in %d mode", client->mode); qemudDispatchClientFailure(server, client); } } static int qemudClientWriteBuf(struct qemud_server *server, struct qemud_client *client, const char *data, int len) { int ret; if (!client->tlssession) { if ((ret = safewrite(client->fd, data, len)) == -1) { qemudLog (QEMUD_ERR, _("write: %s"), strerror (errno)); qemudDispatchClientFailure(server, client); return -1; } } else { ret = gnutls_record_send (client->tlssession, data, len); if (qemudRegisterClientEvent (server, client, 1) < 0) qemudDispatchClientFailure (server, client); else if (ret < 0) { if (ret != GNUTLS_E_INTERRUPTED && ret != GNUTLS_E_AGAIN) { qemudLog (QEMUD_ERR, _("gnutls_record_send: %s"), gnutls_strerror (ret)); qemudDispatchClientFailure (server, client); } return -1; } } return ret; } static int qemudClientWritePlain(struct qemud_server *server, struct qemud_client *client) { int ret = qemudClientWriteBuf(server, client, client->buffer + client->bufferOffset, client->bufferLength - client->bufferOffset); if (ret < 0) return -1; client->bufferOffset += ret; return 0; } #if HAVE_SASL static int qemudClientWriteSASL(struct qemud_server *server, struct qemud_client *client) { int ret; /* Not got any pending encoded data, so we need to encode raw stuff */ if (client->saslEncoded == NULL) { int err; err = sasl_encode(client->saslconn, client->buffer + client->bufferOffset, client->bufferLength - client->bufferOffset, &client->saslEncoded, &client->saslEncodedLength); client->saslEncodedOffset = 0; } /* Send some of the encoded stuff out on the wire */ ret = qemudClientWriteBuf(server, client, client->saslEncoded + client->saslEncodedOffset, client->saslEncodedLength - client->saslEncodedOffset); if (ret < 0) return -1; /* Note how much we sent */ client->saslEncodedOffset += ret; /* Sent all encoded, so update raw buffer to indicate completion */ if (client->saslEncodedOffset == client->saslEncodedLength) { client->saslEncoded = NULL; client->saslEncodedOffset = client->saslEncodedLength = 0; client->bufferOffset = client->bufferLength; } return 0; } #endif static int qemudClientWrite(struct qemud_server *server, struct qemud_client *client) { #if HAVE_SASL if (client->saslSSF & QEMUD_SASL_SSF_WRITE) return qemudClientWriteSASL(server, client); else #endif return qemudClientWritePlain(server, client); } void qemudDispatchClientWrite(struct qemud_server *server, struct qemud_client *client) { switch (client->mode) { case QEMUD_MODE_TX_PACKET: { if (qemudClientWrite(server, client) < 0) return; if (client->bufferOffset == client->bufferLength) { /* Done writing, switch back to receive */ client->mode = QEMUD_MODE_RX_HEADER; client->bufferLength = REMOTE_MESSAGE_HEADER_XDR_LEN; client->bufferOffset = 0; if (qemudRegisterClientEvent (server, client, 1) < 0) qemudDispatchClientFailure (server, client); } /* Still writing */ break; } case QEMUD_MODE_TLS_HANDSHAKE: { int ret; /* Continue the handshake. */ ret = gnutls_handshake (client->tlssession); if (ret == 0) { /* Finished. Next step is to check the certificate. */ if (remoteCheckAccess (client) == -1) qemudDispatchClientFailure (server, client); else if (qemudRegisterClientEvent (server, client, 1)) qemudDispatchClientFailure (server, client); } else if (ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED) { qemudLog (QEMUD_ERR, _("TLS handshake failed: %s"), gnutls_strerror (ret)); qemudDispatchClientFailure (server, client); } else { if (qemudRegisterClientEvent (server, client, 1)) qemudDispatchClientFailure (server, client); } break; } default: qemudDebug("Got unexpected data write while in %d mode", client->mode); qemudDispatchClientFailure(server, client); } } static void qemudDispatchClientEvent(int watch, int fd, int events, void *opaque) { struct qemud_server *server = (struct qemud_server *)opaque; struct qemud_client *client = server->clients; while (client) { if (client->watch == watch) break; client = client->next; } if (!client) return; if (client->fd != fd) return; if (events == VIR_EVENT_HANDLE_WRITABLE) qemudDispatchClientWrite(server, client); else if (events == VIR_EVENT_HANDLE_READABLE) qemudDispatchClientRead(server, client); else qemudDispatchClientFailure(server, client); } static int qemudRegisterClientEvent(struct qemud_server *server, struct qemud_client *client, int removeFirst) { int mode; switch (client->mode) { case QEMUD_MODE_TLS_HANDSHAKE: if (gnutls_record_get_direction (client->tlssession) == 0) mode = VIR_EVENT_HANDLE_READABLE; else mode = VIR_EVENT_HANDLE_WRITABLE; break; case QEMUD_MODE_RX_HEADER: case QEMUD_MODE_RX_PAYLOAD: mode = VIR_EVENT_HANDLE_READABLE; break; case QEMUD_MODE_TX_PACKET: mode = VIR_EVENT_HANDLE_WRITABLE; break; default: return -1; } if (removeFirst) if (virEventRemoveHandleImpl(client->watch) < 0) return -1; if ((client->watch = virEventAddHandleImpl(client->fd, mode | VIR_EVENT_HANDLE_ERROR | VIR_EVENT_HANDLE_HANGUP, qemudDispatchClientEvent, server, NULL)) < 0) return -1; return 0; } static void qemudDispatchServerEvent(int watch, int fd, int events, void *opaque) { struct qemud_server *server = (struct qemud_server *)opaque; struct qemud_socket *sock = server->sockets; while (sock) { if (sock->watch == watch) break; sock = sock->next; } if (!sock) return; if (sock->fd != fd) return; if (events) qemudDispatchServer(server, sock); } static int qemudOneLoop(void) { sig_atomic_t errors; if (virEventRunOnce() < 0) return -1; /* Check for any signal handling errors and log them. */ errors = sig_errors; if (errors) { sig_errors -= errors; qemudLog (QEMUD_ERR, _("Signal handler reported %d errors: last error: %s"), errors, strerror (sig_lasterrno)); return -1; } return 0; } static void qemudInactiveTimer(int timer ATTRIBUTE_UNUSED, void *data) { struct qemud_server *server = (struct qemud_server *)data; qemudDebug("Got inactive timer expiry"); if (!virStateActive()) { qemudDebug("No state active, shutting down"); server->shutdown = 1; } } static int qemudRunLoop(struct qemud_server *server) { int timerid = -1; for (;;) { /* A shutdown timeout is specified, so check * if any drivers have active state, if not * shutdown after timeout seconds */ if (timeout > 0 && !virStateActive() && !server->clients) { timerid = virEventAddTimeoutImpl(timeout*1000, qemudInactiveTimer, server, NULL); qemudDebug("Scheduling shutdown timer %d", timerid); } if (qemudOneLoop() < 0) break; /* Unregister any timeout that's active, since we * just had an event processed */ if (timerid != -1) { qemudDebug("Removing shutdown timer %d", timerid); virEventRemoveTimeoutImpl(timerid); timerid = -1; } if (server->shutdown) return 0; } return -1; } static void qemudCleanup(struct qemud_server *server) { struct qemud_socket *sock; close(server->sigread); sock = server->sockets; while (sock) { struct qemud_socket *next = sock->next; close(sock->fd); free(sock); sock = next; } #ifdef HAVE_SASL if (server->saslUsernameWhitelist) { char **list = server->saslUsernameWhitelist; while (*list) { free(*list); list++; } free(server->saslUsernameWhitelist); } #endif virStateCleanup(); free(server); } /* Allocate an array of malloc'd strings from the config file, filename * (used only in diagnostics), using handle "conf". Upon error, return -1 * and free any allocated memory. Otherwise, save the array in *list_arg * and return 0. */ static int remoteConfigGetStringList(virConfPtr conf, const char *key, char ***list_arg, const char *filename) { char **list; virConfValuePtr p = virConfGetValue (conf, key); if (!p) return 0; switch (p->type) { case VIR_CONF_STRING: if (VIR_ALLOC_N(list, 2) < 0) { qemudLog (QEMUD_ERR, _("failed to allocate memory for %s config list"), key); return -1; } list[0] = strdup (p->str); list[1] = NULL; if (list[0] == NULL) { qemudLog (QEMUD_ERR, _("failed to allocate memory for %s config list value"), key); VIR_FREE(list); return -1; } break; case VIR_CONF_LIST: { int i, len = 0; virConfValuePtr pp; for (pp = p->list; pp; pp = pp->next) len++; if (VIR_ALLOC_N(list, 1+len) < 0) { qemudLog (QEMUD_ERR, _("failed to allocate memory for %s config list"), key); return -1; } for (i = 0, pp = p->list; pp; ++i, pp = pp->next) { if (pp->type != VIR_CONF_STRING) { qemudLog (QEMUD_ERR, _("remoteReadConfigFile: %s: %s:" " must be a string or list of strings\n"), filename, key); VIR_FREE(list); return -1; } list[i] = strdup (pp->str); if (list[i] == NULL) { int j; for (j = 0 ; j < i ; j++) VIR_FREE(list[j]); VIR_FREE(list); qemudLog (QEMUD_ERR, _("failed to allocate memory" " for %s config list value"), key); return -1; } } list[i] = NULL; break; } default: qemudLog (QEMUD_ERR, _("remoteReadConfigFile: %s: %s:" " must be a string or list of strings\n"), filename, key); return -1; } *list_arg = list; return 0; } /* A helper function used by each of the following macros. */ static int checkType (virConfValuePtr p, const char *filename, const char *key, virConfType required_type) { if (p->type != required_type) { qemudLog (QEMUD_ERR, _("remoteReadConfigFile: %s: %s: invalid type:" " got %s; expected %s\n"), filename, key, virConfTypeName (p->type), virConfTypeName (required_type)); return -1; } return 0; } /* If there is no config data for the key, #var_name, then do nothing. If there is valid data of type VIR_CONF_STRING, and strdup succeeds, store the result in var_name. Otherwise, (i.e. invalid type, or strdup failure), give a diagnostic and "goto" the cleanup-and-fail label. */ #define GET_CONF_STR(conf, filename, var_name) \ do { \ virConfValuePtr p = virConfGetValue (conf, #var_name); \ if (p) { \ if (checkType (p, filename, #var_name, VIR_CONF_STRING) < 0) \ goto free_and_fail; \ (var_name) = strdup (p->str); \ if ((var_name) == NULL) { \ qemudLog (QEMUD_ERR, _("remoteReadConfigFile: %s\n"), \ strerror (errno)); \ goto free_and_fail; \ } \ } \ } while (0) /* Like GET_CONF_STR, but for integral values. */ #define GET_CONF_INT(conf, filename, var_name) \ do { \ virConfValuePtr p = virConfGetValue (conf, #var_name); \ if (p) { \ if (checkType (p, filename, #var_name, VIR_CONF_LONG) < 0) \ goto free_and_fail; \ (var_name) = p->l; \ } \ } while (0) static int remoteConfigGetAuth(virConfPtr conf, const char *key, int *auth, const char *filename) { virConfValuePtr p; p = virConfGetValue (conf, key); if (!p) return 0; if (checkType (p, filename, key, VIR_CONF_STRING) < 0) return -1; if (!p->str) return 0; if (STREQ(p->str, "none")) { *auth = REMOTE_AUTH_NONE; #if HAVE_SASL } else if (STREQ(p->str, "sasl")) { *auth = REMOTE_AUTH_SASL; #endif #if HAVE_POLKIT } else if (STREQ(p->str, "polkit")) { *auth = REMOTE_AUTH_POLKIT; #endif } else { qemudLog (QEMUD_ERR, _("remoteReadConfigFile: %s: %s: unsupported auth %s\n"), filename, key, p->str); return -1; } return 0; } #ifdef HAVE_SASL static inline int remoteReadSaslAllowedUsernameList (virConfPtr conf, struct qemud_server *server, const char *filename) { return remoteConfigGetStringList (conf, "sasl_allowed_username_list", &server->saslUsernameWhitelist, filename); } #else static inline int remoteReadSaslAllowedUsernameList (virConfPtr conf ATTRIBUTE_UNUSED, struct qemud_server *server ATTRIBUTE_UNUSED, const char *filename ATTRIBUTE_UNUSED) { return 0; } #endif /* Read the config file if it exists. * Only used in the remote case, hence the name. */ static int remoteReadConfigFile (struct qemud_server *server, const char *filename) { virConfPtr conf; /* The following variable names must match the corresponding configuration strings. */ char *unix_sock_ro_perms = NULL; char *unix_sock_rw_perms = NULL; char *unix_sock_group = NULL; #if HAVE_POLKIT /* Change the default back to no auth for non-root */ if (getuid() != 0 && auth_unix_rw == REMOTE_AUTH_POLKIT) auth_unix_rw = REMOTE_AUTH_NONE; if (getuid() != 0 && auth_unix_ro == REMOTE_AUTH_POLKIT) auth_unix_ro = REMOTE_AUTH_NONE; #endif /* Just check the file is readable before opening it, otherwise * libvirt emits an error. */ if (access (filename, R_OK) == -1) return 0; conf = virConfReadFile (filename); if (!conf) return 0; GET_CONF_INT (conf, filename, listen_tcp); GET_CONF_INT (conf, filename, listen_tls); GET_CONF_STR (conf, filename, tls_port); GET_CONF_STR (conf, filename, tcp_port); GET_CONF_STR (conf, filename, listen_addr); if (remoteConfigGetAuth(conf, "auth_unix_rw", &auth_unix_rw, filename) < 0) goto free_and_fail; #if HAVE_POLKIT /* Change default perms to be wide-open if PolicyKit is enabled. * Admin can always override in config file */ if (auth_unix_rw == REMOTE_AUTH_POLKIT) unix_sock_rw_mask = 0777; #endif if (remoteConfigGetAuth(conf, "auth_unix_ro", &auth_unix_ro, filename) < 0) goto free_and_fail; if (remoteConfigGetAuth(conf, "auth_tcp", &auth_tcp, filename) < 0) goto free_and_fail; if (remoteConfigGetAuth(conf, "auth_tls", &auth_tls, filename) < 0) goto free_and_fail; GET_CONF_STR (conf, filename, unix_sock_group); if (unix_sock_group) { if (getuid() != 0) { qemudLog (QEMUD_WARN, "%s", _("Cannot set group when not running as root")); } else { struct group *grp = getgrnam(unix_sock_group); if (!grp) { qemudLog (QEMUD_ERR, _("Failed to lookup group '%s'"), unix_sock_group); goto free_and_fail; } unix_sock_gid = grp->gr_gid; } free (unix_sock_group); unix_sock_group = NULL; } GET_CONF_STR (conf, filename, unix_sock_ro_perms); if (unix_sock_ro_perms) { if (virStrToLong_i (unix_sock_ro_perms, NULL, 8, &unix_sock_ro_mask) != 0) { qemudLog (QEMUD_ERR, _("Failed to parse mode '%s'"), unix_sock_ro_perms); goto free_and_fail; } free (unix_sock_ro_perms); unix_sock_ro_perms = NULL; } GET_CONF_STR (conf, filename, unix_sock_rw_perms); if (unix_sock_rw_perms) { if (virStrToLong_i (unix_sock_rw_perms, NULL, 8, &unix_sock_rw_mask) != 0) { qemudLog (QEMUD_ERR, _("Failed to parse mode '%s'"), unix_sock_rw_perms); goto free_and_fail; } free (unix_sock_rw_perms); unix_sock_rw_perms = NULL; } GET_CONF_INT (conf, filename, mdns_adv); GET_CONF_STR (conf, filename, mdns_name); GET_CONF_INT (conf, filename, tls_no_verify_certificate); GET_CONF_STR (conf, filename, key_file); GET_CONF_STR (conf, filename, cert_file); GET_CONF_STR (conf, filename, ca_file); GET_CONF_STR (conf, filename, crl_file); if (remoteConfigGetStringList (conf, "tls_allowed_dn_list", &tls_allowed_dn_list, filename) < 0) goto free_and_fail; if (remoteReadSaslAllowedUsernameList (conf, server, filename) < 0) goto free_and_fail; virConfFree (conf); return 0; free_and_fail: virConfFree (conf); free (mdns_name); mdns_name = NULL; free (unix_sock_ro_perms); free (unix_sock_rw_perms); free (unix_sock_group); /* Don't bother trying to free listen_addr, tcp_port, tls_port, key_file, cert_file, ca_file, or crl_file, since they are initialized to non-malloc'd strings. Besides, these are static variables, and callers are unlikely to call this function more than once, so there wouldn't even be a real leak. */ if (tls_allowed_dn_list) { int i; for (i = 0; tls_allowed_dn_list[i]; i++) free (tls_allowed_dn_list[i]); free (tls_allowed_dn_list); tls_allowed_dn_list = NULL; } return -1; } /* Print command-line usage. */ static void usage (const char *argv0) { fprintf (stderr, "\n\ Usage:\n\ %s [options]\n\ \n\ Options:\n\ -v | --verbose Verbose messages.\n\ -d | --daemon Run as a daemon & write PID file.\n\ -l | --listen Listen for TCP/IP connections.\n\ -t | --timeout Exit after timeout period.\n\ -f | --config Configuration file.\n\ -p | --pid-file Change name of PID file.\n\ \n\ libvirt management daemon:\n\ \n\ Default paths:\n\ \n\ Configuration file (unless overridden by -c):\n\ " SYSCONF_DIR "/libvirt/libvirtd.conf\n\ \n\ Sockets (as root):\n\ " LOCAL_STATE_DIR "/run/libvirt/libvirt-sock\n\ " LOCAL_STATE_DIR "/run/libvirt/libvirt-sock-ro\n\ \n\ Sockets (as non-root):\n\ $HOME/.libvirt/libvirt-sock (in UNIX abstract namespace)\n\ \n\ TLS:\n\ CA certificate: " LIBVIRT_CACERT "\n\ Server certificate: " LIBVIRT_SERVERCERT "\n\ Server private key: " LIBVIRT_SERVERKEY "\n\ \n\ PID file (unless overridden by --pid-file):\n\ %s\n\ \n", argv0, REMOTE_PID_FILE[0] != '\0' ? REMOTE_PID_FILE : "(disabled in ./configure)"); } #define MAX_LISTEN 5 int main(int argc, char **argv) { struct qemud_server *server = NULL; struct sigaction sig_action; int sigpipe[2]; const char *pid_file = NULL; const char *remote_config_file = SYSCONF_DIR "/libvirt/libvirtd.conf"; int ret = 1; struct option opts[] = { { "verbose", no_argument, &verbose, 1}, { "daemon", no_argument, &godaemon, 1}, { "listen", no_argument, &ipsock, 1}, { "config", required_argument, NULL, 'f'}, { "timeout", required_argument, NULL, 't'}, { "pid-file", required_argument, NULL, 'p'}, { "help", no_argument, NULL, '?' }, {0, 0, 0, 0} }; while (1) { int optidx = 0; int c; char *tmp; c = getopt_long(argc, argv, "ldf:p:t:v", opts, &optidx); if (c == -1) { break; } switch (c) { case 0: /* Got one of the flags */ break; case 'v': verbose = 1; break; case 'd': godaemon = 1; break; case 'l': ipsock = 1; break; case 't': if (virStrToLong_i(optarg, &tmp, 10, &timeout) != 0 || timeout <= 0 /* Ensure that we can multiply by 1000 without overflowing. */ || timeout > INT_MAX / 1000) timeout = -1; break; case 'p': pid_file = optarg; break; case 'f': remote_config_file = optarg; break; case '?': usage (argv[0]); return 2; default: fprintf (stderr, "libvirtd: internal error: unknown flag: %c\n", c); exit (1); } } if (godaemon) { openlog("libvirtd", 0, 0); if (qemudGoDaemon() < 0) { qemudLog(QEMUD_ERR, _("Failed to fork as daemon: %s"), strerror(errno)); goto error1; } } /* If running as root and no PID file is set, use the default */ if (pid_file == NULL && getuid() == 0 && REMOTE_PID_FILE[0] != '\0') pid_file = REMOTE_PID_FILE; /* If we have a pidfile set, claim it now, exiting if already taken */ if (pid_file != NULL && qemudWritePidFile (pid_file) < 0) goto error1; if (pipe(sigpipe) < 0 || qemudSetNonBlock(sigpipe[0]) < 0 || qemudSetNonBlock(sigpipe[1]) < 0 || qemudSetCloseExec(sigpipe[0]) < 0 || qemudSetCloseExec(sigpipe[1]) < 0) { qemudLog(QEMUD_ERR, _("Failed to create pipe: %s"), strerror(errno)); goto error2; } sigwrite = sigpipe[1]; sig_action.sa_sigaction = sig_handler; sig_action.sa_flags = SA_SIGINFO; sigemptyset(&sig_action.sa_mask); sigaction(SIGHUP, &sig_action, NULL); sigaction(SIGINT, &sig_action, NULL); sigaction(SIGQUIT, &sig_action, NULL); sigaction(SIGTERM, &sig_action, NULL); sigaction(SIGCHLD, &sig_action, NULL); sig_action.sa_handler = SIG_IGN; sigaction(SIGPIPE, &sig_action, NULL); if (!(server = qemudInitialize(sigpipe[0]))) { ret = 2; goto error2; } /* Read the config file (if it exists). */ if (remoteReadConfigFile (server, remote_config_file) < 0) goto error2; /* Change the group ownership of /var/run/libvirt to unix_sock_gid */ if (getuid() == 0) { const char *sockdirname = LOCAL_STATE_DIR "/run/libvirt"; if (chown(sockdirname, -1, unix_sock_gid) < 0) qemudLog(QEMUD_ERR, _("Failed to change group ownership of %s"), sockdirname); } if (virEventAddHandleImpl(sigpipe[0], VIR_EVENT_HANDLE_READABLE, qemudDispatchSignalEvent, server, NULL) < 0) { qemudLog(QEMUD_ERR, "%s", _("Failed to register callback for signal pipe")); ret = 3; goto error2; } if (!(server = qemudNetworkInit(server))) { ret = 2; goto error2; } qemudRunLoop(server); ret = 0; error2: if (server) qemudCleanup(server); if (pid_file) unlink (pid_file); close(sigwrite); error1: if (godaemon) closelog(); return ret; }