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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
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@@ -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;