Remove all direct use of getenv

Unconditional use of getenv is not secure in setuid env.
While not all libvirt code runs in a setuid env (since
much of it only exists inside libvirtd) this is not always
clear to developers. So make all the code paranoid, even
if it only ever runs inside libvirtd.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

diff --git a/daemon/libvirtd.c b/daemon/libvirtd.c
index 99c0342afe9e1b027b4c7cd913f66a16934886c4..aef1546ad5cf566b687889ee45fae344253e4ba1 100644 (file)
--- a/daemon/libvirtd.c
+++ b/daemon/libvirtd.c
@@ -991,7 +991,7 @@ static int migrateProfile(void)
         goto cleanup;
     }
 
-    config_home = getenv("XDG_CONFIG_HOME");
+    config_home = virGetEnvBlockSUID("XDG_CONFIG_HOME");
     if (config_home && config_home[0] != '\0') {
         if (VIR_STRDUP(xdg_dir, config_home) < 0)
             goto cleanup;

diff --git a/src/driver.c b/src/driver.c
index a08dd34cbe56c4589ddc9e8566c674fffedf2846..ab2a2538a0a69c4cc714b8f1e0e0af2ce73b9c09 100644 (file)
--- a/src/driver.c
+++ b/src/driver.c
@@ -27,6 +27,7 @@
 #include "driver.h"
 #include "viralloc.h"
 #include "virlog.h"
+#include "virutil.h"
 #include "configmake.h"
 #include "virstring.h"
 
@@ -43,7 +44,7 @@ static const char *moddir = NULL;
 void
 virDriverModuleInitialize(const char *defmoddir)
 {
-    const char *custommoddir = getenv("LIBVIRT_DRIVER_DIR");
+    const char *custommoddir = virGetEnvBlockSUID("LIBVIRT_DRIVER_DIR");
     if (custommoddir)
         moddir = custommoddir;
     else if (defmoddir)

diff --git a/src/libvirt.c b/src/libvirt.c
index 7ceec30cfc2486c558596b3f5bcc25f14947d4c3..0f8d79a59be9c871769be085ae5df301ca848cdd 100644 (file)
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -1094,7 +1094,7 @@ virConnectGetDefaultURI(virConfPtr conf,
 {
     int ret = -1;
     virConfValuePtr value = NULL;
-    char *defname = getenv("LIBVIRT_DEFAULT_URI");
+    const char *defname = virGetEnvBlockSUID("LIBVIRT_DEFAULT_URI");
     if (defname && *defname) {
         VIR_DEBUG("Using LIBVIRT_DEFAULT_URI '%s'", defname);
         *name = defname;

diff --git a/src/locking/lock_daemon.c b/src/locking/lock_daemon.c
index 5f675ef7279fb0d2958a558ecf2b126717444a06..cef5bd66666fc97deed02fdb56bc46989a200ce5 100644 (file)
--- a/src/locking/lock_daemon.c
+++ b/src/locking/lock_daemon.c
@@ -605,7 +605,7 @@ virLockDaemonSetupNetworkingSystemD(virNetServerPtr srv)
 
     VIR_DEBUG("Setting up networking from systemd");
 
-    if (!(pidstr = getenv("LISTEN_PID"))) {
+    if (!(pidstr = virGetEnvAllowSUID("LISTEN_PID"))) {
         VIR_DEBUG("No LISTEN_FDS from systemd");
         return 0;
     }
@@ -621,7 +621,7 @@ virLockDaemonSetupNetworkingSystemD(virNetServerPtr srv)
         return 0;
     }
 
-    if (!(fdstr = getenv("LISTEN_FDS"))) {
+    if (!(fdstr = virGetEnvAllowSUID("LISTEN_FDS"))) {
         VIR_DEBUG("No LISTEN_FDS from systemd");
         return 0;
     }

diff --git a/src/locking/lock_driver_lockd.c b/src/locking/lock_driver_lockd.c
index b1157995f619ff3f15935647b7d2f93e97ea3c44..86ce2d87be9a78cc23e366a24e0e5e7f39f32ef0 100644 (file)
--- a/src/locking/lock_driver_lockd.c
+++ b/src/locking/lock_driver_lockd.c
@@ -84,7 +84,7 @@ static virLockManagerLockDaemonDriverPtr driver = NULL;
 static const char *
 virLockManagerLockDaemonFindDaemon(void)
 {
-    const char *customDaemon = getenv("VIRTLOCKD_PATH");
+    const char *customDaemon = virGetEnvBlockSUID("VIRTLOCKD_PATH");
 
     if (customDaemon)
         return customDaemon;

diff --git a/src/locking/lock_manager.c b/src/locking/lock_manager.c
index aff54c0ee4ff0febe47b491a218f076ee2aac1bd..f09c168f5e266fabe6cfbaaedd8fe4bc1bb69152 100644 (file)
--- a/src/locking/lock_manager.c
+++ b/src/locking/lock_manager.c
@@ -135,7 +135,7 @@ virLockManagerPluginPtr virLockManagerPluginNew(const char *name,
     void *handle = NULL;
     virLockDriverPtr driver;
     virLockManagerPluginPtr plugin = NULL;
-    const char *moddir = getenv("LIBVIRT_LOCK_MANAGER_PLUGIN_DIR");
+    const char *moddir = virGetEnvBlockSUID("LIBVIRT_LOCK_MANAGER_PLUGIN_DIR");
     char *modfile = NULL;
     char *configFile = NULL;
 

diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 870e4a916da4245d52db783a9f9d01f69d65e2e9..61a90ca54dd80ad5e726cfeadcdc88f9728b3435 100644 (file)
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -1362,14 +1362,14 @@ static int lxcStateInitialize(bool privileged,
                               void *opaque ATTRIBUTE_UNUSED)
 {
     virCapsPtr caps = NULL;
-    char *ld;
+    const char *ld;
     virLXCDriverConfigPtr cfg = NULL;
 
     /* Valgrind gets very annoyed when we clone containers, so
      * disable LXC when under valgrind
      * XXX remove this when valgrind is fixed
      */
-    ld = getenv("LD_PRELOAD");
+    ld = virGetEnvBlockSUID("LD_PRELOAD");
     if (ld && strstr(ld, "vgpreload")) {
         VIR_INFO("Running under valgrind, disabling driver");
         return 0;

diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index 115d0bc74dfdb9f6754a8ec717b700379a21307d..759383e36eb8cb62fc643dd0312dfc8d3f1b9378 100644 (file)
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -187,7 +187,7 @@ remoteFindDaemonPath(void)
         NULL
     };
     size_t i;
-    const char *customDaemon = getenv("LIBVIRTD_PATH");
+    const char *customDaemon = virGetEnvBlockSUID("LIBVIRTD_PATH");
 
     if (customDaemon)
         return customDaemon;
@@ -955,7 +955,7 @@ remoteConnectOpen(virConnectPtr conn,
 {
     struct private_data *priv;
     int ret, rflags = 0;
-    const char *autostart = getenv("LIBVIRT_AUTOSTART");
+    const char *autostart = virGetEnvBlockSUID("LIBVIRT_AUTOSTART");
 
     if (inside_daemon && (!conn->uri || (conn->uri && !conn->uri->server)))
         return VIR_DRV_OPEN_DECLINED;

diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
index 7cee27c8b7425678f8490960c707508623847ffe..cd69794a5aa69c8cb67d95332a9082a7a0701599 100644 (file)
--- a/src/rpc/virnettlscontext.c
+++ b/src/rpc/virnettlscontext.c
@@ -710,7 +710,7 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
                                                bool isServer)
 {
     virNetTLSContextPtr ctxt;
-    char *gnutlsdebug;
+    const char *gnutlsdebug;
     int err;
 
     if (virNetTLSContextInitialize() < 0)
@@ -719,7 +719,7 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
     if (!(ctxt = virObjectLockableNew(virNetTLSContextClass)))
         return NULL;
 
-    if ((gnutlsdebug = getenv("LIBVIRT_GNUTLS_DEBUG")) != NULL) {
+    if ((gnutlsdebug = virGetEnvAllowSUID("LIBVIRT_GNUTLS_DEBUG")) != NULL) {
         int val;
         if (virStrToLong_i(gnutlsdebug, NULL, 10, &val) < 0)
             val = 10;

diff --git a/src/util/virauth.c b/src/util/virauth.c
index f58797c3700e7023f66b2c8da316da98047fb944..e66cbf5a38d392b39690148e2a163c1ac9d585fc 100644 (file)
--- a/src/util/virauth.c
+++ b/src/util/virauth.c
@@ -42,7 +42,7 @@ virAuthGetConfigFilePathURI(virURIPtr uri,
 {
     int ret = -1;
     size_t i;
-    const char *authenv = getenv("LIBVIRT_AUTH_FILE");
+    const char *authenv = virGetEnvBlockSUID("LIBVIRT_AUTH_FILE");
     char *userdir = NULL;
 
     *path = NULL;

diff --git a/src/util/virfile.c b/src/util/virfile.c
index f6fd2a864dba9ced2da2b2ff096e82fb127c6b74..bc607a54a589e1d97b869851942a029ba3e6f3cc 100644 (file)
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -1426,6 +1426,7 @@ virFileIsLink(const char *linkpath)
 char *
 virFindFileInPath(const char *file)
 {
+    const char *origpath = NULL;
     char *path = NULL;
     char *pathiter;
     char *pathseg;
@@ -1454,9 +1455,11 @@ virFindFileInPath(const char *file)
     }
 
     /* copy PATH env so we can tweak it */
-    path = getenv("PATH");
+    origpath = virGetEnvBlockSUID("PATH");
+    if (!origpath)
+        origpath = "/bin:/usr/bin";
 
-    if (VIR_STRDUP_QUIET(path, path) <= 0)
+    if (VIR_STRDUP_QUIET(path, origpath) <= 0)
         return NULL;
 
     /* for each path segment, append the file to search for and test for

diff --git a/src/util/virlog.c b/src/util/virlog.c
index 997d582c75b850b78d331648b71d8fe9cc15f782..5b7e7b06135fe0065af39a4c4c81d9fe02d3cf97 100644 (file)
--- a/src/util/virlog.c
+++ b/src/util/virlog.c
@@ -1637,18 +1637,18 @@ virLogParseDefaultPriority(const char *priority)
 void
 virLogSetFromEnv(void)
 {
-    char *debugEnv;
+    const char *debugEnv;
 
     if (virLogInitialize() < 0)
         return;
 
-    debugEnv = getenv("LIBVIRT_DEBUG");
+    debugEnv = virGetEnvAllowSUID("LIBVIRT_DEBUG");
     if (debugEnv && *debugEnv)
         virLogParseDefaultPriority(debugEnv);
-    debugEnv = getenv("LIBVIRT_LOG_FILTERS");
+    debugEnv = virGetEnvAllowSUID("LIBVIRT_LOG_FILTERS");
     if (debugEnv && *debugEnv)
         virLogParseFilters(debugEnv);
-    debugEnv = getenv("LIBVIRT_LOG_OUTPUTS");
+    debugEnv = virGetEnvAllowSUID("LIBVIRT_LOG_OUTPUTS");
     if (debugEnv && *debugEnv)
         virLogParseOutputs(debugEnv);
 }

diff --git a/src/util/virrandom.c b/src/util/virrandom.c
index b0912f431c93b43dca9e201c2c0928e41c73fedf..491a3afc0ebb1658ec2c8332397f0442c9cf7cb2 100644 (file)
--- a/src/util/virrandom.c
+++ b/src/util/virrandom.c
@@ -66,7 +66,7 @@ virRandomOnceInit(void)
     /* Normally we want a decent seed.  But if reproducible debugging
      * of a fixed pseudo-random sequence is ever required, uncomment
      * this block to let an environment variable force the seed.  */
-    const char *debug = getenv("VIR_DEBUG_RANDOM_SEED");
+    const char *debug = virGetEnvBlockSUID("VIR_DEBUG_RANDOM_SEED");
 
     if (debug && virStrToLong_ui(debug, NULL, 0, &seed) < 0)
         return -1;

diff --git a/src/util/virutil.c b/src/util/virutil.c
index 7e7c1c2d18359f35190037435af0b52f69dee1a1..7e24b4a01c37b2757a57d9a5bc3e3b4ee9633a3a 100644 (file)
--- a/src/util/virutil.c
+++ b/src/util/virutil.c
@@ -782,7 +782,7 @@ virGetUserDirectoryByUID(uid_t uid)
 
 static char *virGetXDGDirectory(const char *xdgenvname, const char *xdgdefdir)
 {
-    const char *path = getenv(xdgenvname);
+    const char *path = virGetEnvBlockSUID(xdgenvname);
     char *ret = NULL;
     char *home = NULL;
 
@@ -810,7 +810,7 @@ char *virGetUserCacheDirectory(void)
 
 char *virGetUserRuntimeDirectory(void)
 {
-    const char *path = getenv("XDG_RUNTIME_DIR");
+    const char *path = virGetEnvBlockSUID("XDG_RUNTIME_DIR");
 
     if (!path || !path[0]) {
         return virGetUserCacheDirectory();
@@ -1143,7 +1143,7 @@ virGetUserDirectoryByUID(uid_t uid ATTRIBUTE_UNUSED)
     const char *dir;
     char *ret;
 
-    dir = getenv("HOME");
+    dir = virGetEnvBlockSUID("HOME");
 
     /* Only believe HOME if it is an absolute path and exists */
     if (dir) {
@@ -1163,7 +1163,7 @@ virGetUserDirectoryByUID(uid_t uid ATTRIBUTE_UNUSED)
 
     if (!dir)
         /* USERPROFILE is probably the closest equivalent to $HOME? */
-        dir = getenv("USERPROFILE");
+        dir = virGetEnvBlockSUID("USERPROFILE");
 
     if (VIR_STRDUP(ret, dir) < 0)
         return NULL;

diff --git a/src/vbox/vbox_XPCOMCGlue.c b/src/vbox/vbox_XPCOMCGlue.c
index 10ddcf89ea2dd021ed3d84b75406849bb5ffc68f..8652e3a09074909e875c1b13dc86d38c12d9a5bd 100644 (file)
--- a/src/vbox/vbox_XPCOMCGlue.c
+++ b/src/vbox/vbox_XPCOMCGlue.c
@@ -201,7 +201,7 @@ VBoxCGlueInit(unsigned int *version)
         "/usr/local/lib/VirtualBox",
         "/Applications/VirtualBox.app/Contents/MacOS"
     };
-    const char *home = getenv("VBOX_APP_HOME");
+    const char *home = virGetEnvBlockSUID("VBOX_APP_HOME");
 
     /* If the user specifies the location, try only that. */
     if (home != NULL) {

diff --git a/src/vbox/vbox_tmpl.c b/src/vbox/vbox_tmpl.c
index cf34f5c365c8a28d6f67592a817de51f11ac3f09..c9940678458026263faf881e08132b59a1e39246 100644 (file)
--- a/src/vbox/vbox_tmpl.c
+++ b/src/vbox/vbox_tmpl.c
@@ -2212,7 +2212,6 @@ static char *vboxDomainGetXMLDesc(virDomainPtr dom, unsigned int flags) {
     vboxIID iid = VBOX_IID_INITIALIZER;
     int gotAllABoutDef   = -1;
     nsresult rc;
-    char *tmp;
 
     /* Flags checked by virDomainDefFormat */
 
@@ -2484,8 +2483,9 @@ static char *vboxDomainGetXMLDesc(virDomainPtr dom, unsigned int flags) {
                     }
                 } else if ((vrdpPresent != 1) && (totalPresent == 0) && (VIR_ALLOC_N(def->graphics, 1) >= 0)) {
                     if (VIR_ALLOC(def->graphics[def->ngraphics]) >= 0) {
+                        const char *tmp;
                         def->graphics[def->ngraphics]->type = VIR_DOMAIN_GRAPHICS_TYPE_DESKTOP;
-                        tmp = getenv("DISPLAY");
+                        tmp = virGetEnvBlockSUID("DISPLAY");
                         if (VIR_STRDUP(def->graphics[def->ngraphics]->data.desktop.display, tmp) < 0) {
                             /* just don't go to cleanup yet as it is ok to have
                              * display as NULL

diff --git a/tools/virsh.c b/tools/virsh.c
index 6842ed8690d302a3012dfbf3a9c47880a838df21..a76229a25414f7d845ab72d4db46e31221ccb3ef 100644 (file)
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -233,7 +233,7 @@ virshErrorHandler(void *unused ATTRIBUTE_UNUSED, virErrorPtr error)
 {
     virFreeError(last_error);
     last_error = virSaveLastError();
-    if (getenv("VIRSH_DEBUG") != NULL)
+    if (virGetEnvAllowSUID("VIRSH_DEBUG") != NULL)
         virDefaultErrorFunc(error);
 }
 
@@ -670,7 +670,7 @@ vshEditWriteToTempFile(vshControl *ctl, const char *doc)
     int fd;
     char ebuf[1024];
 
-    tmpdir = getenv("TMPDIR");
+    tmpdir = virGetEnvBlockSUID("TMPDIR");
     if (!tmpdir) tmpdir = "/tmp";
     if (virAsprintf(&ret, "%s/virshXXXXXX.xml", tmpdir) < 0) {
         vshError(ctl, "%s", _("out of memory"));
@@ -717,9 +717,9 @@ vshEditFile(vshControl *ctl, const char *filename)
     int outfd = STDOUT_FILENO;
     int errfd = STDERR_FILENO;
 
-    editor = getenv("VISUAL");
+    editor = virGetEnvBlockSUID("VISUAL");
     if (!editor)
-        editor = getenv("EDITOR");
+        editor = virGetEnvBlockSUID("EDITOR");
     if (!editor)
         editor = "vi"; /* could be cruel & default to ed(1) here */
 
@@ -2367,11 +2367,11 @@ vshEventLoop(void *opaque)
 static void
 vshInitDebug(vshControl *ctl)
 {
-    char *debugEnv;
+    const char *debugEnv;
 
     if (ctl->debug == VSH_DEBUG_DEFAULT) {
         /* log level not set from commandline, check env variable */
-        debugEnv = getenv("VIRSH_DEBUG");
+        debugEnv = virGetEnvAllowSUID("VIRSH_DEBUG");
         if (debugEnv) {
             int debug;
             if (virStrToLong_i(debugEnv, NULL, 10, &debug) < 0 ||
@@ -2386,7 +2386,7 @@ vshInitDebug(vshControl *ctl)
 
     if (ctl->logfile == NULL) {
         /* log file not set from cmdline */
-        debugEnv = getenv("VIRSH_LOG_FILE");
+        debugEnv = virGetEnvBlockSUID("VIRSH_LOG_FILE");
         if (debugEnv && *debugEnv) {
             ctl->logfile = vshStrdup(ctl, debugEnv);
             vshOpenLogFile(ctl);
@@ -3232,7 +3232,7 @@ int
 main(int argc, char **argv)
 {
     vshControl _ctl, *ctl = &_ctl;
-    char *defaultConn;
+    const char *defaultConn;
     bool ret = true;
 
     memset(ctl, 0, sizeof(vshControl));
@@ -3279,7 +3279,7 @@ main(int argc, char **argv)
     else
         progname++;
 
-    if ((defaultConn = getenv("VIRSH_DEFAULT_CONNECT_URI"))) {
+    if ((defaultConn = virGetEnvBlockSUID("VIRSH_DEFAULT_CONNECT_URI"))) {
         ctl->name = vshStrdup(ctl, defaultConn);
     }