Check return values of setgid/setuid.

[exim.git] / src / src / exim.c

diff --git a/src/src/exim.c b/src/src/exim.c
index dce42f0c42647d7537381c7a4dbf1c9bd941ff07..67fbc5cf7a9a558ae3b9d422eb71fdf2f9d05f69 100644 (file)
--- a/src/src/exim.c
+++ b/src/src/exim.c
@@ -14,6 +14,8 @@ Also a few functions that don't naturally fit elsewhere. */
 
 #include "exim.h"
 
+extern void init_lookup_list(void);
+
 
 
 /*************************************************
@@ -776,53 +778,53 @@ fprintf(f, "Support for:");
 #endif
 fprintf(f, "\n");
 
-fprintf(f, "Lookups:");
-#ifdef LOOKUP_LSEARCH
+fprintf(f, "Lookups (built-in):");
+#if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 #endif
-#ifdef LOOKUP_CDB
+#if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
   fprintf(f, " cdb");
 #endif
-#ifdef LOOKUP_DBM
+#if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
   fprintf(f, " dbm dbmnz");
 #endif
-#ifdef LOOKUP_DNSDB
+#if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
   fprintf(f, " dnsdb");
 #endif
-#ifdef LOOKUP_DSEARCH
+#if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
   fprintf(f, " dsearch");
 #endif
-#ifdef LOOKUP_IBASE
+#if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
   fprintf(f, " ibase");
 #endif
-#ifdef LOOKUP_LDAP
+#if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
   fprintf(f, " ldap ldapdn ldapm");
 #endif
-#ifdef LOOKUP_MYSQL
+#if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
   fprintf(f, " mysql");
 #endif
-#ifdef LOOKUP_NIS
+#if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
   fprintf(f, " nis nis0");
 #endif
-#ifdef LOOKUP_NISPLUS
+#if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
   fprintf(f, " nisplus");
 #endif
-#ifdef LOOKUP_ORACLE
+#if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
   fprintf(f, " oracle");
 #endif
-#ifdef LOOKUP_PASSWD
+#if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
   fprintf(f, " passwd");
 #endif
-#ifdef LOOKUP_PGSQL
+#if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
   fprintf(f, " pgsql");
 #endif
-#ifdef LOOKUP_SQLITE
+#if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
   fprintf(f, " sqlite");
 #endif
-#ifdef LOOKUP_TESTDB
+#if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
   fprintf(f, " testdb");
 #endif
-#ifdef LOOKUP_WHOSON
+#if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
   fprintf(f, " whoson");
 #endif
 fprintf(f, "\n");
@@ -914,6 +916,33 @@ come. */
 #ifdef SUPPORT_TLS
 tls_version_report(f);
 #endif
+
+/* Everything else is details which are only worth reporting when debugging.
+Perhaps the tls_version_report should move into this too. */
+DEBUG(D_any) do {
+
+  int i;
+
+#ifdef AUTH_CYRUS_SASL
+  auth_cyrus_sasl_version_report(f);
+#endif
+
+  fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
+             "                       Runtime: %s\n",
+          PCRE_MAJOR, PCRE_MINOR,
+          /* PRE_PRERELEASE is either defined and empty or a string.
+           * This should work: */
+          PCRE_PRERELEASE "",
+          pcre_version());
+
+  init_lookup_list();
+  for (i = 0; i < lookup_list_count; i++)
+    {
+    if (lookup_list[i]->version_report)
+      lookup_list[i]->version_report(f);
+    }
+
+} while (0);
 }
 
 
@@ -1271,7 +1300,7 @@ int  arg_error_handling = error_handling;
 int  filter_sfd = -1;
 int  filter_ufd = -1;
 int  group_count;
-int  i;
+int  i, rv;
 int  list_queue_option = 0;
 int  msg_action = 0;
 int  msg_action_arg = -1;
@@ -1610,8 +1639,20 @@ real_gid = getgid();
 
 if (real_uid == root_uid)
   {
-  setgid(real_gid);
-  setuid(real_uid);
+  rv = setgid(real_gid);
+  if (rv)
+    {
+    fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
+        (long int)real_gid, strerror(errno));
+    exit(EXIT_FAILURE);
+    }
+  rv = setuid(real_uid);
+  if (rv)
+    {
+    fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
+        (long int)real_uid, strerror(errno));
+    exit(EXIT_FAILURE);
+    }
   }
 
 /* If neither the original real uid nor the original euid was root, Exim is
@@ -3143,7 +3184,8 @@ if (debug_selector != 0)
     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
       debug_selector);
-    show_whats_supported(stderr);
+    if (!version_printed)
+      show_whats_supported(stderr);
     }
   }
 
@@ -3510,6 +3552,13 @@ if (opt_perl_at_start && opt_perl_startup != NULL)
   }
 #endif /* EXIM_PERL */
 
+/* Initialise lookup_list
+If debugging, already called above via version reporting.
+This does mean that debugging causes the list to be initialised while root.
+This *should* be harmless -- all modules are loaded from a fixed dir and
+it's code that would, if not a module, be part of Exim already. */
+init_lookup_list();
+
 /* Log the arguments of the call if the configuration file said so. This is
 a debugging feature for finding out what arguments certain MUAs actually use.
 Don't attempt it if logging is disabled, or if listing variables or if
@@ -3825,7 +3874,28 @@ if (!unprivileged &&                      /* originally had root AND */
 
 /* When we are retaining a privileged uid, we still change to the exim gid. */
 
-else setgid(exim_gid);
+else
+  {
+  int rv;
+  rv = setgid(exim_gid);
+  /* Impact of failure is that some stuff might end up with an incorrect group.
+  We track this for failures from root, since any attempt to change privilege
+  by root should succeed and failures should be examined.  For non-root,
+  there's no security risk.  For me, it's { exim -bV } on a just-built binary,
+  no need to complain then. */
+  if (rv == -1)
+    {
+    if (!unprivileged)
+      {
+      fprintf(stderr,
+          "exim: changing group failed: %s\n", strerror(errno));
+      exit(EXIT_FAILURE);
+      }
+    else
+      debug_printf("changing group to %ld failed: %s\n",
+          (long int)exim_gid, strerror(errno));
+    }
+  }
 
 /* Handle a request to scan a file for malware */
 if (malware_test_file)