55 lines
2.3 KiB
C
55 lines
2.3 KiB
C
#ifndef _LINUX_SECUREBITS_H
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#define _LINUX_SECUREBITS_H 1
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/* Each securesetting is implemented using two bits. One bit specifies
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whether the setting is on or off. The other bit specify whether the
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setting is locked or not. A setting which is locked cannot be
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changed from user-level. */
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#define issecure_mask(X) (1 << (X))
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#ifdef __KERNEL__
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#define issecure(X) (issecure_mask(X) & current_cred_xxx(securebits))
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#endif
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#define SECUREBITS_DEFAULT 0x00000000
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/* When set UID 0 has no special privileges. When unset, we support
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inheritance of root-permissions and suid-root executable under
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compatibility mode. We raise the effective and inheritable bitmasks
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*of the executable file* if the effective uid of the new process is
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0. If the real uid is 0, we raise the effective (legacy) bit of the
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executable file. */
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#define SECURE_NOROOT 0
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#define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */
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#define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT))
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#define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED))
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/* When set, setuid to/from uid 0 does not trigger capability-"fixup".
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When unset, to provide compatiblility with old programs relying on
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set*uid to gain/lose privilege, transitions to/from uid 0 cause
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capabilities to be gained/lost. */
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#define SECURE_NO_SETUID_FIXUP 2
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#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */
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#define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP))
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#define SECBIT_NO_SETUID_FIXUP_LOCKED \
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(issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED))
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/* When set, a process can retain its capabilities even after
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transitioning to a non-root user (the set-uid fixup suppressed by
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bit 2). Bit-4 is cleared when a process calls exec(); setting both
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bit 4 and 5 will create a barrier through exec that no exec()'d
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child can use this feature again. */
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#define SECURE_KEEP_CAPS 4
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#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */
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#define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS))
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#define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))
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#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \
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issecure_mask(SECURE_NO_SETUID_FIXUP) | \
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issecure_mask(SECURE_KEEP_CAPS))
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#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1)
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#endif /* !_LINUX_SECUREBITS_H */
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