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basic: Drop ambient inherited capabilities by default 

Modify the functions capability_update_inherited_set() and
capability_ambient_set_apply() to drop capabilities not explicitly
requested by the user.
This commit is contained in:
Kevin Kuehler 2019-11-24 01:27:09 -08:00
parent 78af8a798a
commit 82d832b435
1 changed files with 18 additions and 10 deletions
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28
src/basic/capability-util.c
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@ -86,20 +86,17 @@ unsigned long cap_last_cap(void) {
int capability_update_inherited_set(cap_t caps, uint64_t set) {
unsigned long i;
/* Add capabilities in the set to the inherited caps. Do not apply
* them yet. */
/* Add capabilities in the set to the inherited caps, drops capabilities not in the set.
* Do not apply them yet. */
for (i = 0; i <= cap_last_cap(); i++) {
cap_flag_value_t flag = set & (UINT64_C(1) << i) ? CAP_SET : CAP_CLEAR;
cap_value_t v;
if (set & (UINT64_C(1) << i)) {
cap_value_t v;
v = (cap_value_t) i;
v = (cap_value_t) i;
/* Make the capability inheritable. */
if (cap_set_flag(caps, CAP_INHERITABLE, 1, &v, CAP_SET) < 0)
return -errno;
}
if (cap_set_flag(caps, CAP_INHERITABLE, 1, &v, flag) < 0)
return -errno;
}
return 0;
@ -132,6 +129,17 @@ int capability_ambient_set_apply(uint64_t set, bool also_inherit) {
/* Add the capability to the ambient set. */
if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, i, 0, 0) < 0)
return -errno;
} else {
/* Drop the capability so we don't inherit capabilities we didn't ask for. */
r = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, i, 0, 0);
if (r < 0)
return -errno;
if (r)
if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_LOWER, i, 0, 0) < 0)
return -errno;
}
}