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smack-setup: enable Smack/CIPSO mapping

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CIPSO is the Common IP Security Option, an IETF standard for setting
security levels for a process sending packets. In Smack kernels,
CIPSO headers are mapped to Smack labels automatically, but can be changed.

This patch writes label/category mappings from /etc/smack/cipso/ to
/sys/fs/smackfs/cipso2. The mapping format is "%s%4d%4d"["%4d"]...

For more information about Smack and CIPSO, see:
  https://kernel.org/doc/Documentation/security/Smack.txt
This commit is contained in:
Nathaniel Chen 2013-03-12 16:16:44 -07:00 committed by Zbigniew Jędrzejewski-Szmek
parent a4783bd17a
commit abbacb1def
1 changed files with 19 additions and 1 deletions
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20
src/core/smack-setup.c
View File

@ -40,6 +40,7 @@
#include "label.h"
#define SMACK_CONFIG "/etc/smack/accesses.d/"
#define CIPSO_CONFIG "/etc/smack/cipso/"
static int write_rules(const char* dstpath, const char* srcdir) {
_cleanup_fclose_ FILE *dst = NULL;
@ -124,9 +125,26 @@ int smack_setup(void) {
return 0;
case 0:
log_info("Successfully loaded Smack policies.");
break;
default:
log_warning("Failed to load Smack access rules: %s, ignoring.",
strerror(abs(r)));
return 0;
}
r = write_rules("/sys/fs/smackfs/cipso2", CIPSO_CONFIG);
switch(r) {
case -ENOENT:
log_debug("Smack/CIPSO is not enabled in the kernel.");
return 0;
case ENOENT:
log_debug("Smack/CIPSO access rules directory " CIPSO_CONFIG " not found");
return 0;
case 0:
log_info("Successfully loaded Smack/CIPSO policies.");
return 0;
default:
log_warning("Failed to load smack access rules: %s, ignoring.",
log_warning("Failed to load Smack/CIPSO access rules: %s, ignoring.",
strerror(abs(r)));
return 0;
}