[libvirt] [PATCH v3 1/2] security: add new internal function "virSecurityManagerGetBaseLabel"

virSecurityManagerGetBaseLabel queries the default settings used by a security model. Signed-off-by: Giuseppe Scrivano <gscrivan(a)redhat.com&gt; --- src/libvirt_private.syms | 1 + src/security/security_apparmor.c | 8 ++++++++ src/security/security_dac.c | 34 ++++++++++++++++++++++++---------- src/security/security_dac.h | 7 +++---- src/security/security_driver.h | 4 ++++ src/security/security_manager.c | 22 ++++++++++++++++++++-- src/security/security_manager.h | 2 ++ src/security/security_nop.c | 10 ++++++++++ src/security/security_selinux.c | 12 ++++++++++++ src/security/security_stack.c | 9 +++++++++ 10 files changed, 93 insertions(+), 16 deletions(-) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 35f0f1b..aea7e94 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -1033,6 +1033,7 @@ virSecurityDriverLookup; # security/security_manager.h virSecurityManagerClearSocketLabel; virSecurityManagerGenLabel; +virSecurityManagerGetBaseLabel; virSecurityManagerGetDOI; virSecurityManagerGetModel; virSecurityManagerGetMountOptions; diff --git a/src/security/security_apparmor.c b/src/security/security_apparmor.c index adc9918..2d74cdd 100644 --- a/src/security/security_apparmor.c +++ b/src/security/security_apparmor.c @@ -931,6 +931,12 @@ AppArmorGetMountOptions(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED, return opts; } +static const char * +AppArmorGetBaseLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED, + int virtType ATTRIBUTE_UNUSED) +{ + return NULL; +} virSecurityDriver virAppArmorSecurityDriver = { .privateDataLen = 0, @@ -972,4 +978,6 @@ virSecurityDriver virAppArmorSecurityDriver = { .domainSetSecurityTapFDLabel = AppArmorSetFDLabel, .domainGetSecurityMountOptions = AppArmorGetMountOptions, + + .getBaseLabel = AppArmoryGetBaseLabel, }; diff --git a/src/security/security_dac.c b/src/security/security_dac.c index 6876bd5..019c789 100644 --- a/src/security/security_dac.c +++ b/src/security/security_dac.c @@ -47,22 +47,25 @@ struct _virSecurityDACData { gid_t *groups; int ngroups; bool dynamicOwnership; + char *baselabel; }; -void -virSecurityDACSetUser(virSecurityManagerPtr mgr, - uid_t user) +/* returns -1 on error, 0 on success */ +int +virSecurityDACSetUserAndGroup(virSecurityManagerPtr mgr, + uid_t user, + gid_t group) { virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr); priv->user = user; -} - -void -virSecurityDACSetGroup(virSecurityManagerPtr mgr, - gid_t group) -{ - virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr); priv->group = group; + + if (virAsprintf(&priv->baselabel, "%u:%u", + (unsigned int) user, + (unsigned int) group) < 0) + return -1; + + return 0; } void @@ -217,6 +220,7 @@ virSecurityDACClose(virSecurityManagerPtr mgr) { virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr); VIR_FREE(priv->groups); + VIR_FREE(priv->baselabel); return 0; } @@ -1170,6 +1174,14 @@ virSecurityDACGetMountOptions(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED, return NULL; } +static const char * +virSecurityDACGetBaseLabel(virSecurityManagerPtr mgr, + int virt ATTRIBUTE_UNUSED) +{ + virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr); + return priv->baselabel; +} + virSecurityDriver virSecurityDriverDAC = { .privateDataLen = sizeof(virSecurityDACData), .name = SECURITY_DAC_NAME, @@ -1212,4 +1224,6 @@ virSecurityDriver virSecurityDriverDAC = { .domainSetSecurityTapFDLabel = virSecurityDACSetTapFDLabel, .domainGetSecurityMountOptions = virSecurityDACGetMountOptions, + + .getBaseLabel = virSecurityDACGetBaseLabel, }; diff --git a/src/security/security_dac.h b/src/security/security_dac.h index 02432a5..dbcf56f 100644 --- a/src/security/security_dac.h +++ b/src/security/security_dac.h @@ -25,10 +25,9 @@ extern virSecurityDriver virSecurityDriverDAC; -void virSecurityDACSetUser(virSecurityManagerPtr mgr, - uid_t user); -void virSecurityDACSetGroup(virSecurityManagerPtr mgr, - gid_t group); +int virSecurityDACSetUserAndGroup(virSecurityManagerPtr mgr, + uid_t user, + gid_t group); void virSecurityDACSetDynamicOwnership(virSecurityManagerPtr mgr, bool dynamic); diff --git a/src/security/security_driver.h b/src/security/security_driver.h index 8735558..ced1b92 100644 --- a/src/security/security_driver.h +++ b/src/security/security_driver.h @@ -46,6 +46,8 @@ typedef int (*virSecurityDriverClose) (virSecurityManagerPtr mgr); typedef const char *(*virSecurityDriverGetModel) (virSecurityManagerPtr mgr); typedef const char *(*virSecurityDriverGetDOI) (virSecurityManagerPtr mgr); +typedef const char *(*virSecurityDriverGetBaseLabel) (virSecurityManagerPtr mgr, + int virtType); typedef int (*virSecurityDriverPreFork) (virSecurityManagerPtr mgr); @@ -154,6 +156,8 @@ struct _virSecurityDriver { virSecurityDomainGetMountOptions domainGetSecurityMountOptions; virSecurityDomainSetHugepages domainSetSecurityHugepages; + + virSecurityDriverGetBaseLabel getBaseLabel; }; virSecurityDriverPtr virSecurityDriverLookup(const char *name, diff --git a/src/security/security_manager.c b/src/security/security_manager.c index 92fb504..c4b8f10 100644 --- a/src/security/security_manager.c +++ b/src/security/security_manager.c @@ -146,8 +146,10 @@ virSecurityManagerPtr virSecurityManagerNewDAC(const char *virtDriver, if (!mgr) return NULL; - virSecurityDACSetUser(mgr, user); - virSecurityDACSetGroup(mgr, group); + if (virSecurityDACSetUserAndGroup(mgr, user, group) < 0) { + virSecurityManagerDispose(mgr); + return NULL; + } virSecurityDACSetDynamicOwnership(mgr, dynamicOwnership); return mgr; @@ -273,6 +275,22 @@ virSecurityManagerGetModel(virSecurityManagerPtr mgr) return NULL; } +/* return NULL if a base label is not present */ +const char * +virSecurityManagerGetBaseLabel(virSecurityManagerPtr mgr, int virtType) +{ + if (mgr->drv->getBaseLabel) { + const char *ret; + virObjectLock(mgr); + ret = mgr->drv->getBaseLabel(mgr, virtType); + virObjectUnlock(mgr); + return ret; + } + + virReportError(VIR_ERR_NO_SUPPORT, __FUNCTION__); + return NULL; +} + bool virSecurityManagerGetAllowDiskFormatProbing(virSecurityManagerPtr mgr) { return mgr->allowDiskFormatProbing; diff --git a/src/security/security_manager.h b/src/security/security_manager.h index 9252830..81d3160 100644 --- a/src/security/security_manager.h +++ b/src/security/security_manager.h @@ -55,6 +55,8 @@ void *virSecurityManagerGetPrivateData(virSecurityManagerPtr mgr); const char *virSecurityManagerGetDriver(virSecurityManagerPtr mgr); const char *virSecurityManagerGetDOI(virSecurityManagerPtr mgr); const char *virSecurityManagerGetModel(virSecurityManagerPtr mgr); +const char *virSecurityManagerGetBaseLabel(virSecurityManagerPtr mgr, int virtType); + bool virSecurityManagerGetAllowDiskFormatProbing(virSecurityManagerPtr mgr); bool virSecurityManagerGetDefaultConfined(virSecurityManagerPtr mgr); bool virSecurityManagerGetRequireConfined(virSecurityManagerPtr mgr); diff --git a/src/security/security_nop.c b/src/security/security_nop.c index 233404c..73e1ac1 100644 --- a/src/security/security_nop.c +++ b/src/security/security_nop.c @@ -186,6 +186,14 @@ static char *virSecurityDomainGetMountOptionsNop(virSecurityManagerPtr mgr ATTRI return opts; } +static const char * +virSecurityGetBaseLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED, + int virtType ATTRIBUTE_UNUSED) +{ + return NULL; +} + + virSecurityDriver virSecurityDriverNop = { .privateDataLen = 0, .name = "none", @@ -226,4 +234,6 @@ virSecurityDriver virSecurityDriverNop = { .domainSetSecurityTapFDLabel = virSecurityDomainSetFDLabelNop, .domainGetSecurityMountOptions = virSecurityDomainGetMountOptionsNop, + + .getBaseLabel = virSecurityGetBaseLabel, }; diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c index 38de060..1c2ea64 100644 --- a/src/security/security_selinux.c +++ b/src/security/security_selinux.c @@ -1827,6 +1827,17 @@ virSecuritySELinuxRestoreSecuritySmartcardCallback(virDomainDefPtr def, } +static const char * +virSecuritySELinuxGetBaseLabel(virSecurityManagerPtr mgr, int virtType) +{ + virSecuritySELinuxDataPtr priv = virSecurityManagerGetPrivateData(mgr); + if (virtType == VIR_DOMAIN_VIRT_QEMU) + return priv->alt_domain_context; + else + return priv->domain_context; +} + + static int virSecuritySELinuxRestoreSecurityAllLabel(virSecurityManagerPtr mgr, virDomainDefPtr def, @@ -2474,4 +2485,5 @@ virSecurityDriver virSecurityDriverSELinux = { .domainSetSecurityTapFDLabel = virSecuritySELinuxSetTapFDLabel, .domainGetSecurityMountOptions = virSecuritySELinuxGetSecurityMountOptions, + .getBaseLabel = virSecuritySELinuxGetBaseLabel, }; diff --git a/src/security/security_stack.c b/src/security/security_stack.c index 0a0dc92..ff0f06b 100644 --- a/src/security/security_stack.c +++ b/src/security/security_stack.c @@ -555,6 +555,13 @@ virSecurityStackGetNested(virSecurityManagerPtr mgr) return list; } +static const char * +virSecurityStackGetBaseLabel(virSecurityManagerPtr mgr, int virtType) +{ + return virSecurityManagerGetBaseLabel(virSecurityStackGetPrimary(mgr), + virtType); +} + virSecurityDriver virSecurityDriverStack = { .privateDataLen = sizeof(virSecurityStackData), .name = "stack", @@ -599,4 +606,6 @@ virSecurityDriver virSecurityDriverStack = { .domainGetSecurityMountOptions = virSecurityStackGetMountOptions, .domainSetSecurityHugepages = virSecurityStackSetHugepages, + + .getBaseLabel = virSecurityStackGetBaseLabel, }; -- 1.8.3.1