Since PIDs can be reused, polkit prefers to be given
a (PID,start time) pair. If given a PID on its own,
it will attempt to lookup the start time in /proc/pid/stat,
though this is subject to races.
It is safer if the client app resolves the PID start
time itself, because as long as the app has the client
socket open, the client PID won't be reused.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
(cherry picked from commit
979e9c56a7aadf2dcfbddd1abfbad594b78b4468)
Signed-off-by: Eric Blake <eblake@redhat.com>
Conflicts:
src/libvirt_private.syms - not backported
src/locking/lock_daemon.c - not backported
src/rpc/virnetserverclient.c
src/rpc/virnetsocket.c
src/rpc/virnetsocket.h
src/util/viridentity.h - not backported
src/util/virprocess.c
src/util/virprocess.h
src/util/virstring.c
src/util/virstring.h
Most conflicts were contextual (this patch adds new functions,
but upstream intermediate patches not backported here also added
new features, and the resolution was picking out just the portions
needed by this commit). virnetsocket.c also had slightly
different locking semantics.
uid_t callerUid;
gid_t callerGid;
pid_t callerPid;
+ unsigned long long timestamp;
/* If the client is root then we want to bypass the
* policykit auth to avoid root being denied if
*/
if (auth == VIR_NET_SERVER_SERVICE_AUTH_POLKIT) {
if (virNetServerClientGetUNIXIdentity(client, &callerUid, &callerGid,
- &callerPid) < 0) {
+ &callerPid, ×tamp) < 0) {
/* Don't do anything on error - it'll be validated at next
* phase of auth anyway */
virResetLastError();
pid_t callerPid = -1;
gid_t callerGid = -1;
uid_t callerUid = -1;
+ unsigned long long timestamp;
const char *action;
int status = -1;
char *ident = NULL;
}
if (virNetServerClientGetUNIXIdentity(client, &callerUid, &callerGid,
- &callerPid) < 0) {
+ &callerPid, ×tamp) < 0) {
goto authfail;
}
(long long) callerPid, callerUid);
virCommandAddArg(cmd, "--process");
- virCommandAddArgFormat(cmd, "%lld", (long long) callerPid);
+ if (timestamp != 0) {
+ virCommandAddArgFormat(cmd, "%lld,%llu", (long long) callerPid, timestamp);
+ } else {
+ virCommandAddArgFormat(cmd, "%lld", (long long) callerPid);
+ }
virCommandAddArg(cmd, "--allow-user-interaction");
if (virAsprintf(&ident, "pid:%lld,uid:%d",
}
int virNetServerClientGetUNIXIdentity(virNetServerClientPtr client,
- uid_t *uid, gid_t *gid, pid_t *pid)
+ uid_t *uid, gid_t *gid, pid_t *pid,
+ unsigned long long *timestamp)
{
int ret = -1;
virNetServerClientLock(client);
if (client->sock)
- ret = virNetSocketGetUNIXIdentity(client->sock, uid, gid, pid);
+ ret = virNetSocketGetUNIXIdentity(client->sock,
+ uid, gid, pid,
+ timestamp);
virNetServerClientUnlock(client);
return ret;
}
+
bool virNetServerClientIsSecure(virNetServerClientPtr client)
{
bool secure = false;
const char *virNetServerClientGetIdentity(virNetServerClientPtr client);
int virNetServerClientGetUNIXIdentity(virNetServerClientPtr client,
- uid_t *uid, gid_t *gid, pid_t *pid);
+ uid_t *uid, gid_t *gid, pid_t *pid,
+ unsigned long long *timestamp);
void virNetServerClientRef(virNetServerClientPtr client);
int virNetSocketGetUNIXIdentity(virNetSocketPtr sock,
uid_t *uid,
gid_t *gid,
- pid_t *pid)
+ pid_t *pid,
+ unsigned long long *timestamp)
{
struct ucred cr;
socklen_t cr_len = sizeof(cr);
+ int ret = -1;
+
virMutexLock(&sock->lock);
if (getsockopt(sock->fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) < 0) {
virReportSystemError(errno, "%s",
_("Failed to get client socket identity"));
- virMutexUnlock(&sock->lock);
- return -1;
+ goto cleanup;
}
+ if (virProcessGetStartTime(cr.pid, timestamp) < 0)
+ goto cleanup;
+
*pid = cr.pid;
*uid = cr.uid;
*gid = cr.gid;
+ ret = 0;
+
+cleanup:
virMutexUnlock(&sock->lock);
- return 0;
+ return ret;
}
#else
int virNetSocketGetUNIXIdentity(virNetSocketPtr sock ATTRIBUTE_UNUSED,
uid_t *uid ATTRIBUTE_UNUSED,
gid_t *gid ATTRIBUTE_UNUSED,
- pid_t *pid ATTRIBUTE_UNUSED)
+ pid_t *pid ATTRIBUTE_UNUSED,
+ unsigned long long *timestamp ATTRIBUTE_UNUSED)
{
/* XXX Many more OS support UNIX socket credentials we could port to. See dbus ....*/
virReportSystemError(ENOSYS, "%s",
int virNetSocketGetUNIXIdentity(virNetSocketPtr sock,
uid_t *uid,
gid_t *gid,
- pid_t *pid);
+ pid_t *pid,
+ unsigned long long *timestamp);
int virNetSocketSetBlocking(virNetSocketPtr sock,
bool blocking);
#include <errno.h>
#include <sys/wait.h>
+#ifdef __FreeBSD__
+# include <sys/param.h>
+# include <sys/sysctl.h>
+# include <sys/user.h>
+#endif
+
+#include "viratomic.h"
#include "virprocess.h"
#include "virterror_internal.h"
#include "memory.h"
#include "logging.h"
#include "util.h"
+#include "virstring.h"
#include "ignore-value.h"
#define virReportError(code, ...) \
virReportErrorHelper(VIR_FROM_NONE, code, __FILE__, \
return kill(pid, sig);
#endif
}
+
+
+#ifdef __linux__
+/*
+ * Port of code from polkitunixprocess.c under terms
+ * of the LGPLv2+
+ */
+int virProcessGetStartTime(pid_t pid,
+ unsigned long long *timestamp)
+{
+ char *filename = NULL;
+ char *buf = NULL;
+ char *tmp;
+ int ret = -1;
+ int len;
+ char **tokens = NULL;
+
+ if (virAsprintf(&filename, "/proc/%llu/stat",
+ (unsigned long long)pid) < 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ if ((len = virFileReadAll(filename, 1024, &buf)) < 0)
+ goto cleanup;
+
+ /* start time is the token at index 19 after the '(process name)' entry - since only this
+ * field can contain the ')' character, search backwards for this to avoid malicious
+ * processes trying to fool us
+ */
+
+ if (!(tmp = strrchr(buf, ')'))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Cannot find start time in %s"),
+ filename);
+ goto cleanup;
+ }
+ tmp += 2; /* skip ') ' */
+ if ((tmp - buf) >= len) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Cannot find start time in %s"),
+ filename);
+ goto cleanup;
+ }
+
+ tokens = virStringSplit(tmp, " ", 0);
+
+ if (virStringListLength(tokens) < 20) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Cannot find start time in %s"),
+ filename);
+ goto cleanup;
+ }
+
+ if (virStrToLong_ull(tokens[19],
+ NULL,
+ 10,
+ timestamp) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Cannot parse start time %s in %s"),
+ tokens[19], filename);
+ goto cleanup;
+ }
+
+ ret = 0;
+
+cleanup:
+ virStringFreeList(tokens);
+ VIR_FREE(filename);
+ VIR_FREE(buf);
+ return ret;
+}
+#elif defined(__FreeBSD__)
+int virProcessGetStartTime(pid_t pid,
+ unsigned long long *timestamp)
+{
+ struct kinfo_proc p;
+ int mib[4];
+ size_t len = 4;
+
+ sysctlnametomib("kern.proc.pid", mib, &len);
+
+ len = sizeof(struct kinfo_proc);
+ mib[3] = pid;
+
+ if (sysctl(mib, 4, &p, &len, NULL, 0) < 0) {
+ virReportSystemError(errno, "%s",
+ _("Unable to query process ID start time"));
+ return -1;
+ }
+
+ *timestamp = (unsigned long long)p.ki_start.tv_sec;
+
+ return 0;
+
+}
+#else
+int virProcessGetStartTime(pid_t pid,
+ unsigned long long *timestamp)
+{
+ static int warned = 0;
+ if (virAtomicIntInc(&warned) == 1) {
+ VIR_WARN("Process start time of pid %llu not available on this platform",
+ (unsigned long long)pid);
+ warned = true;
+ }
+ *timestamp = 0;
+ return 0;
+}
+#endif
int virProcessKill(pid_t pid, int sig);
+int virProcessGetStartTime(pid_t pid,
+ unsigned long long *timestamp);
+
#endif /* __VIR_PROCESS_H__ */
}
VIR_FREE(strings);
}
+
+
+size_t virStringListLength(char **strings)
+{
+ size_t i = 0;
+
+ while (strings && strings[i])
+ i++;
+
+ return i;
+}
void virStringFreeList(char **strings);
+size_t virStringListLength(char **strings);
+
#endif /* __VIR_STRING_H__ */
projects / thirdparty / libvirt.git / commitdiff
