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cr_canseejailproc(): New privilege, no direct check for UID 0
Use priv_check_cred() with a new privilege (PRIV_SEEJAILPROC) instead of explicitly testing for UID 0 (the former has been the rule for almost 20 years). As a consequence, cr_canseejailproc() now abides by the 'security.bsd.suser_enabled' sysctl and MAC policies. Update the MAC policies Biba and LOMAC, and prison_priv_check() so that they don't deny this privilege. This preserves the existing behavior (the 'root' user is not restricted, even when jailed, unless 'security.bsd.suser_enabled' is not 0) and is consistent with what is done for the related policies/privileges (PRIV_SEEOTHERGIDS, PRIV_SEEOTHERUIDS). Reviewed by: emaste (earlier version), mhorne MFC after: 2 weeks Sponsored by: Kumacom SAS Differential Revision: https://reviews.freebsd.org/D40626
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@ -3939,6 +3939,7 @@ prison_priv_check(struct ucred *cred, int priv)
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*/
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case PRIV_SEEOTHERGIDS:
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case PRIV_SEEOTHERUIDS:
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case PRIV_SEEJAILPROC:
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/*
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* Jail implements inter-process debugging limits already, so
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@ -1426,9 +1426,12 @@ SYSCTL_INT(_security_bsd, OID_AUTO, see_jail_proc, CTLFLAG_RW,
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int
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cr_canseejailproc(struct ucred *u1, struct ucred *u2)
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{
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if (u1->cr_uid == 0)
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if (see_jail_proc || /* Policy deactivated. */
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u1->cr_prison == u2->cr_prison || /* Same jail. */
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priv_check_cred(u1, PRIV_SEEJAILPROC) == 0) /* Privileged. */
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return (0);
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return (!see_jail_proc && u1->cr_prison != u2->cr_prison ? ESRCH : 0);
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return (ESRCH);
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}
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/*-
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@ -1924,6 +1924,7 @@ biba_priv_check(struct ucred *cred, int priv)
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*/
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case PRIV_SEEOTHERGIDS:
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case PRIV_SEEOTHERUIDS:
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case PRIV_SEEJAILPROC:
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break;
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/*
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@ -1702,6 +1702,7 @@ lomac_priv_check(struct ucred *cred, int priv)
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*/
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case PRIV_SEEOTHERGIDS:
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case PRIV_SEEOTHERUIDS:
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case PRIV_SEEJAILPROC:
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break;
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/*
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@ -105,6 +105,7 @@
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#define PRIV_CRED_SETRESGID 58 /* setresgid. */
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#define PRIV_SEEOTHERGIDS 59 /* Exempt bsd.seeothergids. */
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#define PRIV_SEEOTHERUIDS 60 /* Exempt bsd.seeotheruids. */
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#define PRIV_SEEJAILPROC 61 /* Exempt from bsd.see_jail_proc. */
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/*
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* Debugging privileges.
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