Re: [libvirt] [PATCH 2/2] libvirt patch to write a mcs translation file to /run/setrans directory

From: Dan Walsh <dwalsh(a)redhat.com&gt; mcstransd is a translation tool that can translate MCS Labels into human understandable code. I have patched it to watch for translation files in the /run/setrans directory. This allows us to run commands like ps -eZ and see system_u:system_r:svirt_t:Fedora18 rather then system_u:system_r:svirt_t:s0:c1,c2. When used with containers it would make an easy way to list all processes within a container using ps -eZ | grep Fedora18 --- src/security/security_selinux.c | 59 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 58 insertions(+), 1 deletion(-) diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c index 5d108b9..cbcd013 100644 --- a/src/security/security_selinux.c +++ b/src/security/security_selinux.c @@ -83,6 +83,57 @@ virSecuritySELinuxRestoreSecurityTPMFileLabelInt(virSecurityManagerPtr mgr, virDomainTPMDefPtr tpm); +static int +virSecuritySELinuxAddMCSFile(const char *name, + const char *label) +{ + int ret = -1; + char *tmp = NULL; + context_t con = NULL; + + if (virAsprintf(&tmp, "%s/%s", SELINUX_TRANS_DIR, name) < 0) { + virReportOOMError(); + return -1; + } + if (! (con = context_new(label))) {

+ virReportSystemError(errno, "%s", + _("unable to allocate security context")); + goto cleanup; + } + if (virFileWriteStr(tmp, context_range_get(con), 0) < 0) { + virReportSystemError(errno, + _("unable to create MCS file %s"), tmp); + goto cleanup; + } + ret = 0; + +cleanup: + VIR_FREE(tmp); + context_free(con); + return ret; +} + +static int +virSecuritySELinuxRemoveMCSFile(const char *name) +{ + char *tmp=NULL;

+ int ret = -1; + if (virAsprintf(&tmp, "%s/%s", SELINUX_TRANS_DIR, name) < 0) { + virReportOOMError(); + return -1; + } + if (unlink(tmp) < 0 && errno != ENOENT) { + virReportSystemError(errno, + _("Unable to remove MCS file %s"), tmp); + goto cleanup; + } + ret = 0; + +cleanup: + VIR_FREE(tmp); + return ret; +} + /* * Returns 0 on success, 1 if already reserved, or -1 on fatal error */ @@ -1953,7 +2004,7 @@ virSecuritySELinuxReleaseSecurityLabel(virSecurityManagerPtr mgr, } VIR_FREE(secdef->imagelabel); - return 0; + return virSecuritySELinuxRemoveMCSFile(def->name); } @@ -2047,10 +2098,16 @@ virSecuritySELinuxSetSecurityProcessLabel(virSecurityManagerPtr mgr ATTRIBUTE_UN return -1; } + if (virSecuritySELinuxAddMCSFile(def->name, secdef->label) < 0) { + if (security_getenforce() == 1) + return -1;

+ } + if (setexeccon_raw(secdef->label) == -1) { virReportSystemError(errno, _("unable to set security context '%s'"), secdef->label); + virSecuritySELinuxRemoveMCSFile(def->name); if (security_getenforce() == 1) return -1; }