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cred: setuid, setgid, seteuid, setegid and auth check

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Matheus
2024-08-25 16:08:06 -03:00
parent 87adc4d10a
commit fdcda428f9
8 changed files with 247 additions and 15 deletions
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kernel-src/sys/cred.c
+69 -2
View File
@@ -1,12 +1,15 @@
#include <kernel/cred.h>
#include <errno.h>
#include <logging.h>
#include <kernel/auth.h>
int cred_setuids(cred_t *cred, int uid, int euid, int suid) {
if (uid < -1 || euid < -1 || suid < -1 || (uid == -1 && euid == -1 && suid == -1))
return EINVAL;
// TODO do permission check to see if its possible
int error = auth_cred_check(cred, AUTH_ACTIONS_CRED_SETRESUID, uid, euid, suid);
if (error)
return error;
cred->uid = (uid == -1) ? cred->uid : uid;
cred->euid = (euid == -1) ? cred->euid : euid;
@@ -19,7 +22,9 @@ int cred_setgids(cred_t *cred, int gid, int egid, int sgid) {
if (gid < -1 || egid < -1 || sgid < -1 || (gid == -1 && egid == -1 && sgid == -1))
return EINVAL;
// TODO do permission check to see if its possible
int error = auth_cred_check(cred, AUTH_ACTIONS_CRED_SETRESGID, gid, egid, sgid);
if (error)
return error;
cred->gid = (gid == -1) ? cred->gid : gid;
cred->egid = (egid == -1) ? cred->egid : egid;
@@ -28,6 +33,68 @@ int cred_setgids(cred_t *cred, int gid, int egid, int sgid) {
return 0;
}
int cred_setuid(cred_t *cred, int uid) {
if (uid < 0)
return EINVAL;
int error = auth_cred_check(cred, AUTH_ACTIONS_CRED_SETUID, uid, -1, -1);
if (error)
return error;
if (CRED_IS_ESU(cred)) {
cred->uid = uid;
cred->euid = uid;
cred->suid = uid;
} else {
cred->euid = uid;
}
return 0;
}
int cred_seteuid(cred_t *cred, int euid) {
if (euid < 0)
return EINVAL;
int error = auth_cred_check(cred, AUTH_ACTIONS_CRED_SETEUID, -1, euid, -1);
if (error)
return error;
cred->euid = euid;
return 0;
}
int cred_setgid(cred_t *cred, int gid) {
if (gid < 0)
return EINVAL;
int error = auth_cred_check(cred, AUTH_ACTIONS_CRED_SETGID, gid, -1, -1);
if (error)
return error;
if (CRED_IS_ESU(cred)) {
cred->gid = gid;
cred->egid = gid;
cred->sgid = gid;
} else {
cred->egid = gid;
}
return 0;
}
int cred_setegid(cred_t *cred, int egid) {
if (egid < 0)
return EINVAL;
int error = auth_cred_check(cred, AUTH_ACTIONS_CRED_SETEGID, -1, egid, -1);
if (error)
return error;
cred->egid = egid;
return 0;
}
void cred_doexec(cred_t *cred, int suid, int sgid) {
if (suid > -1)
cred->euid = suid;
kernel-src/sys/defaultauth.c
+89
View File
@@ -109,7 +109,96 @@ static int system(cred_t *cred, int actions, void *arg0, void *arg1, void *arg2)
return weight ? AUTH_DECISION_ALLOW : AUTH_DECISION_DEFER;
}
static int credlistener(cred_t *cred, int actions, void *arg0, void *arg1, void *arg2) {
int *id = arg0;
int *eid = arg1;
int *sid = arg2;
int weight = 0;
if (actions & AUTH_ACTIONS_CRED_SETRESUID) {
if (CRED_IS_ESU(cred)) {
weight += 1;
} else {
if (*id != -1 && *id != cred->uid && *id != cred->euid && *id != cred->suid)
return AUTH_DECISION_DENY;
if (*eid != -1 && *id != cred->uid && *id != cred->euid && *id != cred->suid)
return AUTH_DECISION_DENY;
if (*sid != -1 && *sid != cred->uid && *sid != cred->euid && *sid != cred->suid)
return AUTH_DECISION_DENY;
weight += 1;
}
DONE_CHECK(actions);
}
if (actions & AUTH_ACTIONS_CRED_SETRESGID) {
if (CRED_IS_ESU(cred)) {
weight += 1;
} else {
if (*id != -1 && *id != cred->gid && *id != cred->egid && *id != cred->sgid)
return AUTH_DECISION_DENY;
if (*eid != -1 && *id != cred->gid && *id != cred->egid && *id != cred->sgid)
return AUTH_DECISION_DENY;
if (*sid != -1 && *sid != cred->gid && *sid != cred->egid && *sid != cred->sgid)
return AUTH_DECISION_DENY;
weight += 1;
}
DONE_CHECK(actions);
}
if (actions & AUTH_ACTIONS_CRED_SETUID) {
if (CRED_IS_ESU(cred)) {
weight += 1;
} else if (*id != cred->uid && *id != cred->suid) {
return AUTH_DECISION_DENY;
}
weight += 1;
DONE_CHECK(actions)
}
if (actions & AUTH_ACTIONS_CRED_SETGID) {
if (CRED_IS_ESU(cred)) {
weight += 1;
} else if (*id != cred->gid && *id != cred->sgid) {
return AUTH_DECISION_DENY;
}
weight += 1;
DONE_CHECK(actions)
}
if (actions & AUTH_ACTIONS_CRED_SETEUID) {
if (CRED_IS_ESU(cred)) {
weight += 1;
} else if (*eid != cred->uid && *eid != cred->suid) {
return AUTH_DECISION_DENY;
}
weight += 1;
DONE_CHECK(actions)
}
if (actions & AUTH_ACTIONS_CRED_SETEGID) {
if (CRED_IS_ESU(cred)) {
weight += 1;
} else if (*eid != cred->gid && *eid != cred->sgid) {
return AUTH_DECISION_DENY;
}
weight += 1;
DONE_CHECK(actions)
}
done:
return weight ? AUTH_DECISION_ALLOW : AUTH_DECISION_DEFER;
}
void defaultauth_init() {
auth_registerlistener(AUTH_SCOPE_FILESYSTEM, filesystem);
auth_registerlistener(AUTH_SCOPE_SYSTEM, system);
auth_registerlistener(AUTH_SCOPE_CRED, credlistener);
}
kernel-src/sys/syscalls/setresuid.c
+36
View File
@@ -10,3 +10,39 @@ syscallret_t syscall_setresuid(context_t *, uid_t uid, uid_t euid, uid_t suid) {
return ret;
}
syscallret_t syscall_setuid(context_t *, uid_t uid) {
syscallret_t ret;
ret.errno = cred_setuid(&_cpu()->thread->proc->cred, uid);
ret.ret = ret.errno ? -1 : 0;
return ret;
}
syscallret_t syscall_seteuid(context_t *, uid_t euid) {
syscallret_t ret;
ret.errno = cred_seteuid(&_cpu()->thread->proc->cred, euid);
ret.ret = ret.errno ? -1 : 0;
return ret;
}
syscallret_t syscall_setgid(context_t *, gid_t gid) {
syscallret_t ret;
ret.errno = cred_setgid(&_cpu()->thread->proc->cred, gid);
ret.ret = ret.errno ? -1 : 0;
return ret;
}
syscallret_t syscall_setegid(context_t *, uid_t egid) {
syscallret_t ret;
ret.errno = cred_setegid(&_cpu()->thread->proc->cred, egid);
ret.ret = ret.errno ? -1 : 0;
return ret;
}