1 files changed, 166 insertions, 0 deletions
diff --git a/security/prelude-pflogger/files/run-prelude-pflogger.c b/security/prelude-pflogger/files/run-prelude-pflogger.c
new file mode 100644
index 00000000000..e065663f4b8
--- /dev/null
+++ b/security/prelude-pflogger/files/run-prelude-pflogger.c
@@ -0,0 +1,166 @@
+#define PRELUDE_PFLOGGER_USER "@PRELUDE_USER@"
+#define PRELUDE_PFLOGGER_PATH "@PREFIX@/bin/prelude-pflogger"
+
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <pwd.h>
+#include <syslog.h>
+
+#define MAX_ARGS 40
+#ifndef         TRUE
+#define         TRUE                            1
+#endif                          /* TRUE */
+
+#ifndef         FALSE
+#define         FALSE                           0
+#endif                          /* FALSE */
+
+
+void error_sys(char *str)
+
+{
+    /* Output error message to syslog */
+    char msg[1024];
+    snprintf(msg, sizeof(msg), "run-prelude-pflogger : %s : %s", str, strerror(errno));
+    syslog(LOG_ALERT, msg);
+
+}
+
+
+int obtainUIDandGID(const char *name, uid_t *pw_uid, gid_t *pw_gid)
+{
+    /* Obtain UID and GID from passwd entry identified by name */
+    struct passwd *pw_entry;
+    char msg[100];
+
+    if ((pw_entry = getpwnam(name)) == NULL)
+    {
+        snprintf(msg, sizeof(msg), "failed to get password entry for %s", name);
+        error_sys(msg);
+        return FALSE;
+    }
+    else
+    {
+        *pw_uid = pw_entry->pw_uid;
+        *pw_gid = pw_entry->pw_gid;
+        return TRUE;
+
+    }
+}
+
+
+int main (int argc, char **argv )
+
+{
+
+    pid_t pid;
+    uid_t UID;
+    gid_t GID;
+    pid_t pidwait;
+    int waitstat;
+    int s;
+    int max_fd;
+
+    /* Sanity check */
+    if (argc > MAX_ARGS)
+    {
+        error_sys("arg buffer too small");
+        exit(-1);
+    }
+
+    if (geteuid() != 0)
+    {
+        error_sys("must be called by root");
+        exit(-1);
+    }
+
+    /* fork child that will become prelude-pflogger */
+    if ((pid = fork()) < 0)
+
+        error_sys("fork error");
+
+    else
+
+    {
+
+        if (pid == 0)
+
+        {
+
+            /* We're the child */
+            char *args[MAX_ARGS];
+            unsigned int i;
+
+            /* Become session leader */
+            setsid();
+
+            /* Change working directory to root directory.
+               The current working directory could be a mounted
+               filesystem; if the daemon stays on a mounted
+               filesystem it could prevent the filesystem from
+               being umounted. */
+            chdir("/");
+
+            /* Clear out file creation mask */
+            umask(0);
+
+            /* Close unneeded file descriptors */
+            max_fd = (int) sysconf(_SC_OPEN_MAX);
+            if (max_fd == -1)
+                max_fd = getdtablesize();
+            for (s = 3; s < max_fd; s++)
+                (void) close(s);
+
+            if (!obtainUIDandGID(PRELUDE_PFLOGGER_USER, &UID, &GID))
+                exit(-1);
+
+            /* Drop privileges immediately */
+            if (setgid(GID) < 0)
+            {
+                /* It is VERY important to check return
+                   value and not continue if setgid fails
+                */
+                error_sys ("setgid failed");
+                exit (-1);
+            }
+
+            if (setuid(UID) < 0)
+            {
+                /* It is VERY important to check return
+                   value and not continue if setuid fails
+                */
+                error_sys ("setuid failed");
+                exit (-1);
+            }
+
+            /* Build calling argv */
+            args[0] = PRELUDE_PFLOGGER_PATH;
+            for (i=1;i<argc;i++)
+            {
+                args[i] = argv[i];
+            }
+            args[i++] = NULL;
+
+            /* Finally transform self into prelude-pflogger */
+            if (execvp(PRELUDE_PFLOGGER_PATH, args) < 0)
+                error_sys("execve error");
+            else
+                ; /* avoid if-then ambiguity */
+        }
+
+        else
+
+        {
+            /* We're the parent
+               Terminate
+            */
+            exit(0);
+        }
+
+    }
+
+}