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Conditionally logging debug messages based on the WRAPPER_DEBUG env var being set (or not)

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This commit is contained in:
Parnell Springmeyer 2017-01-30 12:59:29 -06:00
parent d8ecd5eb0d
commit 128bdac94f
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GPG key ID: DCCF89258EAD874A
1 changed files with 22 additions and 13 deletions
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35
nixos/modules/security/wrappers/wrapper.c
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@ -26,6 +26,9 @@ extern char **environ;
static char * sourceProg = SOURCE_PROG;
static char * wrapperDir = WRAPPER_DIR;
// Wrapper debug variable name
static char * wrapperDebug = "WRAPPER_DEBUG";
// Update the capabilities of the running process to include the given
// capability in the Ambient set.
static void set_ambient_cap(cap_value_t cap)
@ -34,7 +37,7 @@ static void set_ambient_cap(cap_value_t cap)
if (capng_update(CAPNG_ADD, CAPNG_INHERITABLE, (unsigned long) cap))
{
printf("cannot raise the capability into the Inheritable set\n");
perror("cannot raise the capability into the Inheritable set\n");
exit(1);
}
@ -56,7 +59,9 @@ static int make_caps_ambient(const char *selfPath)
if(!caps)
{
fprintf(stderr, "no caps set or could not retrieve the caps for this file, not doing anything...\n");
if(getenv(wrapperDebug))
fprintf(stderr, "no caps set or could not retrieve the caps for this file, not doing anything...");
return 1;
}
@ -127,23 +132,27 @@ static int make_caps_ambient(const char *selfPath)
cap_value_t capnum;
if (cap_from_name(tok, &capnum))
{
fprintf(stderr, "cap_from_name failed, skipping: %s\n", tok);
if(getenv(wrapperDebug))
fprintf(stderr, "cap_from_name failed, skipping: %s", tok);
}
else if (capnum == CAP_SETPCAP)
{
// Check for the cap_setpcap capability, we set this on the
// wrapper so it can elevate the capabilities to the Ambient
// set but we do not want to propagate it down into the
// wrapped program.
//
// TODO: what happens if that's the behavior you want
// though???? I'm preferring a strict vs. loose policy here.
fprintf(stderr, "cap_setpcap in set, skipping it\n");
// Check for the cap_setpcap capability, we set this on the
// wrapper so it can elevate the capabilities to the Ambient
// set but we do not want to propagate it down into the
// wrapped program.
//
// TODO: what happens if that's the behavior you want
// though???? I'm preferring a strict vs. loose policy here.
if(getenv(wrapperDebug))
fprintf(stderr, "cap_setpcap in set, skipping it\n");
}
else
{
set_ambient_cap(capnum);
printf("raised %s into the Ambient capability set\n", tok);
set_ambient_cap(capnum);
if(getenv(wrapperDebug))
fprintf(stderr, "raised %s into the Ambient capability set\n", tok);
}
}
cap_free(capstr);