1*607ca46eSDavid Howells #ifndef _UAPI_LINUX_SECUREBITS_H 2*607ca46eSDavid Howells #define _UAPI_LINUX_SECUREBITS_H 3*607ca46eSDavid Howells 4*607ca46eSDavid Howells /* Each securesetting is implemented using two bits. One bit specifies 5*607ca46eSDavid Howells whether the setting is on or off. The other bit specify whether the 6*607ca46eSDavid Howells setting is locked or not. A setting which is locked cannot be 7*607ca46eSDavid Howells changed from user-level. */ 8*607ca46eSDavid Howells #define issecure_mask(X) (1 << (X)) 9*607ca46eSDavid Howells 10*607ca46eSDavid Howells #define SECUREBITS_DEFAULT 0x00000000 11*607ca46eSDavid Howells 12*607ca46eSDavid Howells /* When set UID 0 has no special privileges. When unset, we support 13*607ca46eSDavid Howells inheritance of root-permissions and suid-root executable under 14*607ca46eSDavid Howells compatibility mode. We raise the effective and inheritable bitmasks 15*607ca46eSDavid Howells *of the executable file* if the effective uid of the new process is 16*607ca46eSDavid Howells 0. If the real uid is 0, we raise the effective (legacy) bit of the 17*607ca46eSDavid Howells executable file. */ 18*607ca46eSDavid Howells #define SECURE_NOROOT 0 19*607ca46eSDavid Howells #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ 20*607ca46eSDavid Howells 21*607ca46eSDavid Howells #define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT)) 22*607ca46eSDavid Howells #define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED)) 23*607ca46eSDavid Howells 24*607ca46eSDavid Howells /* When set, setuid to/from uid 0 does not trigger capability-"fixup". 25*607ca46eSDavid Howells When unset, to provide compatiblility with old programs relying on 26*607ca46eSDavid Howells set*uid to gain/lose privilege, transitions to/from uid 0 cause 27*607ca46eSDavid Howells capabilities to be gained/lost. */ 28*607ca46eSDavid Howells #define SECURE_NO_SETUID_FIXUP 2 29*607ca46eSDavid Howells #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ 30*607ca46eSDavid Howells 31*607ca46eSDavid Howells #define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP)) 32*607ca46eSDavid Howells #define SECBIT_NO_SETUID_FIXUP_LOCKED \ 33*607ca46eSDavid Howells (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED)) 34*607ca46eSDavid Howells 35*607ca46eSDavid Howells /* When set, a process can retain its capabilities even after 36*607ca46eSDavid Howells transitioning to a non-root user (the set-uid fixup suppressed by 37*607ca46eSDavid Howells bit 2). Bit-4 is cleared when a process calls exec(); setting both 38*607ca46eSDavid Howells bit 4 and 5 will create a barrier through exec that no exec()'d 39*607ca46eSDavid Howells child can use this feature again. */ 40*607ca46eSDavid Howells #define SECURE_KEEP_CAPS 4 41*607ca46eSDavid Howells #define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ 42*607ca46eSDavid Howells 43*607ca46eSDavid Howells #define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS)) 44*607ca46eSDavid Howells #define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED)) 45*607ca46eSDavid Howells 46*607ca46eSDavid Howells #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ 47*607ca46eSDavid Howells issecure_mask(SECURE_NO_SETUID_FIXUP) | \ 48*607ca46eSDavid Howells issecure_mask(SECURE_KEEP_CAPS)) 49*607ca46eSDavid Howells #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) 50*607ca46eSDavid Howells 51*607ca46eSDavid Howells #endif /* _UAPI_LINUX_SECUREBITS_H */ 52