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libcapng: do not try to drop capabilities that are not present

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add global libcapng.default to not abort when libcapng fails
  resolves: rhbz#2216919
This commit is contained in:
alakatos 2023-06-27 08:14:39 +02:00
parent 203cd69dcb
commit 2f5a1a9930
3 changed files with 264 additions and 1 deletions
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109
rsyslog-8.2102.0-rhbz2216919-libcapng-default.patch Normal file
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@ -0,0 +1,109 @@
diff -up rsyslog-8.2102.0/runtime/glbl.c.orig rsyslog-8.2102.0/runtime/glbl.c
--- rsyslog-8.2102.0/runtime/glbl.c.orig 2023-06-27 08:20:45.265387162 +0200
+++ rsyslog-8.2102.0/runtime/glbl.c 2023-06-27 08:20:45.262387154 +0200
@@ -230,7 +230,8 @@ static struct cnfparamdescr cnfparamdesc
{ "reverselookup.cache.ttl.enable", eCmdHdlrBinary, 0 },
{ "shutdown.queue.doublesize", eCmdHdlrBinary, 0 },
{ "debug.files", eCmdHdlrArray, 0 },
- { "debug.whitelist", eCmdHdlrBinary, 0 }
+ { "debug.whitelist", eCmdHdlrBinary, 0 },
+ { "libcapng.default", eCmdHdlrBinary, 0 }
};
static struct cnfparamblk paramblk =
{ CNFPARAMBLK_VERSION,
@@ -1315,6 +1316,13 @@ glblDoneLoadCnf(void)
if(!strcmp(paramblk.descr[i].name, "workdirectory")) {
cstr = (uchar*) es_str2cstr(cnfparamvals[i].val.d.estr, NULL);
setWorkDir(NULL, cstr);
+ } else if(!strcmp(paramblk.descr[i].name, "libcapng.default")) {
+#ifdef ENABLE_LIBCAPNG
+ loadConf->globals.bAbortOnFailedLibcapngSetup = (int) cnfparamvals[i].val.d.n;
+#else
+ LogError(0, RS_RET_ERR, "rsyslog wasn't "
+ "compiled with libcap-ng support.");
+#endif
} else if(!strcmp(paramblk.descr[i].name, "variables.casesensitive")) {
const int val = (int) cnfparamvals[i].val.d.n;
fjson_global_do_case_sensitive_comparison(val);
diff -up rsyslog-8.2102.0/runtime/rsconf.c.orig rsyslog-8.2102.0/runtime/rsconf.c
--- rsyslog-8.2102.0/runtime/rsconf.c.orig 2023-06-27 08:20:45.265387162 +0200
+++ rsyslog-8.2102.0/runtime/rsconf.c 2023-06-27 08:20:45.264387159 +0200
@@ -146,6 +146,9 @@ int rsconfNeedDropPriv(rsconf_t *const c
static void cnfSetDefaults(rsconf_t *pThis)
{
+#ifdef ENABLE_LIBCAPNG
+ pThis->globals.bAbortOnFailedLibcapngSetup = 1;
+#endif
pThis->globals.bAbortOnUncleanConfig = 0;
pThis->globals.bReduceRepeatMsgs = 0;
pThis->globals.bDebugPrintTemplateList = 1;
diff -up rsyslog-8.2102.0/runtime/rsconf.h.orig rsyslog-8.2102.0/runtime/rsconf.h
--- rsyslog-8.2102.0/runtime/rsconf.h.orig 2023-06-27 08:20:45.265387162 +0200
+++ rsyslog-8.2102.0/runtime/rsconf.h 2023-06-27 08:20:45.260387149 +0200
@@ -61,6 +61,9 @@ struct queuecnf_s {
* be re-set as often as the user likes).
*/
struct globals_s {
+#ifdef ENABLE_LIBCAPNG
+ int bAbortOnFailedLibcapngSetup;
+#endif
int bDebugPrintTemplateList;
int bDebugPrintModuleList;
int bDebugPrintCfSysLineHandlerList;
diff -up rsyslog-8.2102.0/tools/rsyslogd.c.orig rsyslog-8.2102.0/tools/rsyslogd.c
--- rsyslog-8.2102.0/tools/rsyslogd.c.orig 2023-06-27 08:20:45.245387109 +0200
+++ rsyslog-8.2102.0/tools/rsyslogd.c 2023-06-27 08:31:35.250120215 +0200
@@ -2151,7 +2151,7 @@ main(int argc, char **argv)
/*
* Drop capabilities to the necessary set
*/
- int capng_rc;
+ int capng_rc, capng_failed = 0;
capng_clear(CAPNG_SELECT_BOTH);
if ((capng_rc = capng_updatev(CAPNG_ADD, CAPNG_EFFECTIVE|CAPNG_PERMITTED,
@@ -2161,10 +2161,9 @@ main(int argc, char **argv)
CAP_LEASE,
CAP_NET_ADMIN,
CAP_NET_BIND_SERVICE,
+ CAP_DAC_OVERRIDE,
CAP_SETGID,
CAP_SETUID,
- CAP_DAC_OVERRIDE,
- CAP_NET_RAW,
CAP_SYS_ADMIN,
CAP_SYS_CHROOT,
CAP_SYS_RESOURCE,
@@ -2173,17 +2172,25 @@ main(int argc, char **argv)
)) != 0) {
LogError(0, RS_RET_LIBCAPNG_ERR,
"could not update the internal posix capabilities settings "
- "based on the options passed to it, capng_updatev=%d\n", capng_rc);
- exit(-1);
+ "based on the options passed to it, capng_updatev=%d", capng_rc);
+ capng_failed = 1;
}
if ((capng_rc = capng_apply(CAPNG_SELECT_BOTH)) != 0) {
LogError(0, RS_RET_LIBCAPNG_ERR,
- "could not transfer the specified internal posix capabilities "
- "settings to the kernel, capng_apply=%d\n", capng_rc);
- exit(-1);
+ "could not transfer the specified internal posix capabilities "
+ "settings to the kernel, capng_apply=%d", capng_rc);
+ capng_failed = 1;
+ }
+
+ if (capng_failed) {
+ DBGPRINTF("Capabilities were not dropped successfully.\n");
+ if (loadConf->globals.bAbortOnFailedLibcapngSetup) {
+ exit(RS_RET_LIBCAPNG_ERR);
+ }
+ } else {
+ DBGPRINTF("Capabilities were dropped successfully\n");
}
- DBGPRINTF("Capabilities were dropped successfully\n");
#endif
initAll(argc, argv);

145
rsyslog-8.2102.0-rhbz2216919-libcapng-no-drop.patch Normal file
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@ -0,0 +1,145 @@
diff -up rsyslog-8.2102.0/tools/rsyslogd.c.orig rsyslog-8.2102.0/tools/rsyslogd.c
--- rsyslog-8.2102.0/tools/rsyslogd.c.orig 2023-06-27 08:56:27.321174891 +0200
+++ rsyslog-8.2102.0/tools/rsyslogd.c 2023-06-27 08:58:17.977481782 +0200
@@ -1557,6 +1557,88 @@ initAll(int argc, char **argv)
resetErrMsgsFlag();
localRet = rsconf.Load(&ourConf, ConfFile);
+ #ifdef ENABLE_LIBCAPNG
+ /*
+ * Drop capabilities to the necessary set
+ */
+ int capng_rc, capng_failed = 0;
+ typedef struct capabilities_s {
+ int capability; /* capability code */
+ const char *name; /* name of the capability to be displayed */
+ sbool present; /* is the capability present that is needed by rsyslog? if so we do not drop it */
+ } capabilities_t;
+
+ capabilities_t capabilities[] = {
+ #define CAP_FIELD(code) { code, #code, 0 }
+ CAP_FIELD(CAP_BLOCK_SUSPEND),
+ CAP_FIELD(CAP_CHOWN),
+ CAP_FIELD(CAP_IPC_LOCK),
+ CAP_FIELD(CAP_LEASE),
+ CAP_FIELD(CAP_NET_ADMIN),
+ CAP_FIELD(CAP_NET_BIND_SERVICE),
+ CAP_FIELD(CAP_DAC_OVERRIDE),
+ CAP_FIELD(CAP_SETGID),
+ CAP_FIELD(CAP_SETUID),
+ CAP_FIELD(CAP_SYS_ADMIN),
+ CAP_FIELD(CAP_SYS_CHROOT),
+ CAP_FIELD(CAP_SYS_RESOURCE),
+ CAP_FIELD(CAP_SYSLOG)
+ #undef CAP_FIELD
+ };
+
+ if (capng_have_capabilities(CAPNG_SELECT_CAPS) > CAPNG_NONE) {
+ /* Examine which capabilities are available to us, so we do not try to
+ drop something that is not present. We need to do this in two steps,
+ because capng_clear clears the capability set. In the second step,
+ we add back those caps, which were present before clearing the selected
+ posix capabilities set.
+ */
+ unsigned long caps_len = sizeof(capabilities) / sizeof(capabilities_t);
+ for (unsigned long i = 0; i < caps_len; i++) {
+ if (capng_have_capability(CAPNG_EFFECTIVE, capabilities[i].capability)) {
+ capabilities[i].present = 1;
+ }
+ }
+
+ capng_clear(CAPNG_SELECT_BOTH);
+
+ for (unsigned long i = 0; i < caps_len; i++) {
+ if (capabilities[i].present) {
+ DBGPRINTF("The %s capability is present, "
+ "will try to preserve it.\n", capabilities[i].name);
+ if ((capng_rc = capng_update(CAPNG_ADD, CAPNG_EFFECTIVE|CAPNG_PERMITTED,
+ capabilities[i].capability)) != 0) {
+ LogError(0, RS_RET_LIBCAPNG_ERR,
+ "could not update the internal posix capabilities settings "
+ "based on the options passed to it, capng_update=%d", capng_rc);
+ capng_failed = 1;
+ }
+ } else {
+ DBGPRINTF("The %s capability is not present, "
+ "will not try to preserve it.\n", capabilities[i].name);
+ }
+ }
+
+ if ((capng_rc = capng_apply(CAPNG_SELECT_BOTH)) != 0) {
+ LogError(0, RS_RET_LIBCAPNG_ERR,
+ "could not transfer the specified internal posix capabilities "
+ "settings to the kernel, capng_apply=%d", capng_rc);
+ capng_failed = 1;
+ }
+
+ if (capng_failed) {
+ DBGPRINTF("Capabilities were not dropped successfully.\n");
+ if (loadConf->globals.bAbortOnFailedLibcapngSetup) {
+ ABORT_FINALIZE(RS_RET_LIBCAPNG_ERR);
+ }
+ } else {
+ DBGPRINTF("Capabilities were dropped successfully\n");
+ }
+ } else {
+ DBGPRINTF("No capabilities to drop\n");
+ }
+#endif
+
if(fp_rs_full_conf_output != NULL) {
if(fp_rs_full_conf_output != stdout) {
fclose(fp_rs_full_conf_output);
@@ -2147,52 +2229,6 @@ main(int argc, char **argv)
bProcessInternalMessages = 1;
dbgClassInit();
-#ifdef ENABLE_LIBCAPNG
- /*
- * Drop capabilities to the necessary set
- */
- int capng_rc, capng_failed = 0;
- capng_clear(CAPNG_SELECT_BOTH);
-
- if ((capng_rc = capng_updatev(CAPNG_ADD, CAPNG_EFFECTIVE|CAPNG_PERMITTED,
- CAP_BLOCK_SUSPEND,
- CAP_CHOWN,
- CAP_IPC_LOCK,
- CAP_LEASE,
- CAP_NET_ADMIN,
- CAP_NET_BIND_SERVICE,
- CAP_DAC_OVERRIDE,
- CAP_SETGID,
- CAP_SETUID,
- CAP_SYS_ADMIN,
- CAP_SYS_CHROOT,
- CAP_SYS_RESOURCE,
- CAP_SYSLOG,
- -1
- )) != 0) {
- LogError(0, RS_RET_LIBCAPNG_ERR,
- "could not update the internal posix capabilities settings "
- "based on the options passed to it, capng_updatev=%d", capng_rc);
- capng_failed = 1;
- }
-
- if ((capng_rc = capng_apply(CAPNG_SELECT_BOTH)) != 0) {
- LogError(0, RS_RET_LIBCAPNG_ERR,
- "could not transfer the specified internal posix capabilities "
- "settings to the kernel, capng_apply=%d", capng_rc);
- capng_failed = 1;
- }
-
- if (capng_failed) {
- DBGPRINTF("Capabilities were not dropped successfully.\n");
- if (loadConf->globals.bAbortOnFailedLibcapngSetup) {
- exit(RS_RET_LIBCAPNG_ERR);
- }
- } else {
- DBGPRINTF("Capabilities were dropped successfully\n");
- }
-#endif
-
initAll(argc, argv);
#ifdef HAVE_LIBSYSTEMD
sd_notify(0, "READY=1");

11
rsyslog.spec
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@ -5,7 +5,7 @@
Summary: Enhanced system logging and kernel message trapping daemon
Name: rsyslog
Version: 8.2102.0
Release: 115%{?dist}
Release: 116%{?dist}
License: (GPLv3+ and ASL 2.0)
URL: http://www.rsyslog.com/
Source0: http://www.rsyslog.com/files/download/rsyslog/%{name}-%{version}.tar.gz
@ -48,6 +48,8 @@ Patch26: rsyslog-8.2102.0-rhbz2192955-es-4.patch
Patch27: rsyslog-8.2102.0-rhbz2192955-es-5.patch
Patch28: rsyslog-8.2102.0-rhbz2192955-es-6.patch
Patch29: rsyslog-8.2102.0-rhbz2192955-es-doc.patch
Patch30: rsyslog-8.2102.0-rhbz2216919-libcapng-default.patch
Patch31: rsyslog-8.2102.0-rhbz2216919-libcapng-no-drop.patch
BuildRequires: make
BuildRequires: gcc
@ -313,6 +315,8 @@ mv build doc
%patch27 -p1 -b .es5
%patch28 -p1 -b .es6
%patch29 -p1 -b .es-doc
%patch30 -p1
%patch31 -p1
pushd ..
%patch9 -p1 -b .openssl-compatibility
@ -578,6 +582,11 @@ done
%changelog
* Tue Jun 27 2023 Attila Lakatos <alakatos@redhat.com> - 8.2102.0-116
- libcapng: do not try to drop capabilities that are not present
- add global libcapng.default to not abort when libcapng fails
resolves: rhbz#2216919
* Mon May 22 2023 Attila Lakatos <alakatos@redhat.com> - 8.2102.0-115
- omelasticsearch: make compatible with elasticsearch>=8
- add new action specific parameter esversion.major