[libvirt] [PATCH 07/17] util: simplify virCommand APIs for env passthrough.
Daniel P. Berrangé
berrange at redhat.com
Thu Aug 1 15:00:09 UTC 2019
Now that 100% of libvirt code is forbidden in a SUID environment,
we no longer need to worry about whether env variables are
trustworthy or not. The virt-login-shell setuid program, which
does not link to any libvirt code, will purge all environment
variables, except $TERM, before invoking the virt-login-shell-helper
program which uses libvirt.
Thus we only need one API for env passthrough in virCommand.
Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
src/libvirt_private.syms | 3 +--
src/lxc/lxc_process.c | 2 +-
src/qemu/qemu_command.c | 8 +++----
src/rpc/virnetsocket.c | 16 +++++++-------
src/util/vircommand.c | 46 ++++++++--------------------------------
src/util/vircommand.h | 8 ++-----
tests/commandtest.c | 8 +++----
7 files changed, 29 insertions(+), 62 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 8f344a07ee..983fe93d99 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1709,8 +1709,7 @@ virCommandAddArgSet;
virCommandAddEnvBuffer;
virCommandAddEnvFormat;
virCommandAddEnvPair;
-virCommandAddEnvPassAllowSUID;
-virCommandAddEnvPassBlockSUID;
+virCommandAddEnvPass;
virCommandAddEnvPassCommon;
virCommandAddEnvString;
virCommandAddEnvXDG;
diff --git a/src/lxc/lxc_process.c b/src/lxc/lxc_process.c
index 714eef20c8..a1d028b2e6 100644
--- a/src/lxc/lxc_process.c
+++ b/src/lxc/lxc_process.c
@@ -936,7 +936,7 @@ virLXCProcessBuildControllerCmd(virLXCDriverPtr driver,
cmd = virCommandNew(vm->def->emulator);
/* The controller may call ip command, so we have to retain PATH. */
- virCommandAddEnvPassBlockSUID(cmd, "PATH", "/bin:/usr/bin");
+ virCommandAddEnvPass(cmd, "PATH");
virCommandAddEnvFormat(cmd, "LIBVIRT_DEBUG=%d",
virLogGetDefaultPriority());
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index fee51158a9..f4b7e25cdf 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -8074,8 +8074,8 @@ qemuBuildGraphicsSDLCommandLine(virQEMUDriverConfigPtr cfg ATTRIBUTE_UNUSED,
* use QEMU's host audio drivers, possibly SDL too
* User can set these two before starting libvirtd
*/
- virCommandAddEnvPassBlockSUID(cmd, "QEMU_AUDIO_DRV", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "SDL_AUDIODRIVER", NULL);
+ virCommandAddEnvPass(cmd, "QEMU_AUDIO_DRV");
+ virCommandAddEnvPass(cmd, "SDL_AUDIODRIVER");
virCommandAddArg(cmd, "-display");
virBufferAddLit(&opt, "sdl");
@@ -8230,7 +8230,7 @@ qemuBuildGraphicsVNCCommandLine(virQEMUDriverConfigPtr cfg,
* security issues and might not work when using VNC.
*/
if (cfg->vncAllowHostAudio)
- virCommandAddEnvPassBlockSUID(cmd, "QEMU_AUDIO_DRV", NULL);
+ virCommandAddEnvPass(cmd, "QEMU_AUDIO_DRV");
else
virCommandAddEnvString(cmd, "QEMU_AUDIO_DRV=none");
@@ -10685,7 +10685,7 @@ qemuBuildCommandLine(virQEMUDriverPtr driver,
virCommandAddArg(cmd, "none");
if (cfg->nogfxAllowHostAudio)
- virCommandAddEnvPassBlockSUID(cmd, "QEMU_AUDIO_DRV", NULL);
+ virCommandAddEnvPass(cmd, "QEMU_AUDIO_DRV");
else
virCommandAddEnvString(cmd, "QEMU_AUDIO_DRV=none");
}
diff --git a/src/rpc/virnetsocket.c b/src/rpc/virnetsocket.c
index 3282bc0817..ebd304707a 100644
--- a/src/rpc/virnetsocket.c
+++ b/src/rpc/virnetsocket.c
@@ -141,9 +141,9 @@ static int virNetSocketForkDaemon(const char *binary)
NULL);
virCommandAddEnvPassCommon(cmd);
- virCommandAddEnvPassBlockSUID(cmd, "XDG_CACHE_HOME", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "XDG_CONFIG_HOME", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "XDG_RUNTIME_DIR", NULL);
+ virCommandAddEnvPass(cmd, "XDG_CACHE_HOME");
+ virCommandAddEnvPass(cmd, "XDG_CONFIG_HOME");
+ virCommandAddEnvPass(cmd, "XDG_RUNTIME_DIR");
virCommandClearCaps(cmd);
virCommandDaemonize(cmd);
ret = virCommandRun(cmd, NULL);
@@ -873,11 +873,11 @@ int virNetSocketNewConnectSSH(const char *nodename,
cmd = virCommandNew(binary ? binary : "ssh");
virCommandAddEnvPassCommon(cmd);
- virCommandAddEnvPassBlockSUID(cmd, "KRB5CCNAME", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "SSH_AUTH_SOCK", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "SSH_ASKPASS", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "DISPLAY", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "XAUTHORITY", NULL);
+ virCommandAddEnvPass(cmd, "KRB5CCNAME");
+ virCommandAddEnvPass(cmd, "SSH_AUTH_SOCK");
+ virCommandAddEnvPass(cmd, "SSH_ASKPASS");
+ virCommandAddEnvPass(cmd, "DISPLAY");
+ virCommandAddEnvPass(cmd, "XAUTHORITY");
virCommandClearCaps(cmd);
if (service)
diff --git a/src/util/vircommand.c b/src/util/vircommand.c
index 2df71014f8..ea9a9fd622 100644
--- a/src/util/vircommand.c
+++ b/src/util/vircommand.c
@@ -1410,17 +1410,15 @@ virCommandAddEnvBuffer(virCommandPtr cmd, virBufferPtr buf)
/**
- * virCommandAddEnvPassAllowSUID:
+ * virCommandAddEnvPass:
* @cmd: the command to modify
* @name: the name to look up in current environment
*
* Pass an environment variable to the child
* using current process' value
- *
- * Allow to be passed even if setuid
*/
void
-virCommandAddEnvPassAllowSUID(virCommandPtr cmd, const char *name)
+virCommandAddEnvPass(virCommandPtr cmd, const char *name)
{
const char *value;
if (!cmd || cmd->has_error)
@@ -1432,32 +1430,6 @@ virCommandAddEnvPassAllowSUID(virCommandPtr cmd, const char *name)
}
-/**
- * virCommandAddEnvPassBlockSUID:
- * @cmd: the command to modify
- * @name: the name to look up in current environment
- * @defvalue: value to return if running setuid, may be NULL
- *
- * Pass an environment variable to the child
- * using current process' value.
- *
- * Do not pass if running setuid
- */
-void
-virCommandAddEnvPassBlockSUID(virCommandPtr cmd, const char *name, const char *defvalue)
-{
- const char *value;
- if (!cmd || cmd->has_error)
- return;
-
- value = virGetEnvBlockSUID(name);
- if (!value)
- value = defvalue;
- if (value)
- virCommandAddEnvPair(cmd, name, value);
-}
-
-
/**
* virCommandAddEnvPassCommon:
* @cmd: the command to modify
@@ -1478,13 +1450,13 @@ virCommandAddEnvPassCommon(virCommandPtr cmd)
virCommandAddEnvPair(cmd, "LC_ALL", "C");
- virCommandAddEnvPassBlockSUID(cmd, "LD_PRELOAD", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "LD_LIBRARY_PATH", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "PATH", "/bin:/usr/bin");
- virCommandAddEnvPassBlockSUID(cmd, "HOME", NULL);
- virCommandAddEnvPassAllowSUID(cmd, "USER");
- virCommandAddEnvPassAllowSUID(cmd, "LOGNAME");
- virCommandAddEnvPassBlockSUID(cmd, "TMPDIR", NULL);
+ virCommandAddEnvPass(cmd, "LD_PRELOAD");
+ virCommandAddEnvPass(cmd, "LD_LIBRARY_PATH");
+ virCommandAddEnvPass(cmd, "PATH");
+ virCommandAddEnvPass(cmd, "HOME");
+ virCommandAddEnvPass(cmd, "USER");
+ virCommandAddEnvPass(cmd, "LOGNAME");
+ virCommandAddEnvPass(cmd, "TMPDIR");
}
diff --git a/src/util/vircommand.h b/src/util/vircommand.h
index 74574e3fb1..1a7158d4c1 100644
--- a/src/util/vircommand.h
+++ b/src/util/vircommand.h
@@ -110,12 +110,8 @@ void virCommandAddEnvString(virCommandPtr cmd,
void virCommandAddEnvBuffer(virCommandPtr cmd,
virBufferPtr buf);
-void virCommandAddEnvPassBlockSUID(virCommandPtr cmd,
- const char *name,
- const char *defvalue) ATTRIBUTE_NONNULL(2);
-
-void virCommandAddEnvPassAllowSUID(virCommandPtr cmd,
- const char *name) ATTRIBUTE_NONNULL(2);
+void virCommandAddEnvPass(virCommandPtr cmd,
+ const char *name) ATTRIBUTE_NONNULL(2);
void virCommandAddEnvPassCommon(virCommandPtr cmd);
diff --git a/tests/commandtest.c b/tests/commandtest.c
index d7ab588969..a382bb6dd2 100644
--- a/tests/commandtest.c
+++ b/tests/commandtest.c
@@ -305,8 +305,8 @@ static int test6(const void *unused ATTRIBUTE_UNUSED)
{
virCommandPtr cmd = virCommandNew(abs_builddir "/commandhelper");
- virCommandAddEnvPassBlockSUID(cmd, "DISPLAY", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "DOESNOTEXIST", NULL);
+ virCommandAddEnvPass(cmd, "DISPLAY");
+ virCommandAddEnvPass(cmd, "DOESNOTEXIST");
if (virCommandRun(cmd, NULL) < 0) {
printf("Cannot run child %s\n", virGetLastErrorMessage());
@@ -329,8 +329,8 @@ static int test7(const void *unused ATTRIBUTE_UNUSED)
virCommandPtr cmd = virCommandNew(abs_builddir "/commandhelper");
virCommandAddEnvPassCommon(cmd);
- virCommandAddEnvPassBlockSUID(cmd, "DISPLAY", NULL);
- virCommandAddEnvPassBlockSUID(cmd, "DOESNOTEXIST", NULL);
+ virCommandAddEnvPass(cmd, "DISPLAY");
+ virCommandAddEnvPass(cmd, "DOESNOTEXIST");
if (virCommandRun(cmd, NULL) < 0) {
printf("Cannot run child %s\n", virGetLastErrorMessage());
--
2.21.0
More information about the libvir-list
mailing list