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59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/*
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* Copyright (c) 2026 Ilya Priven <ikon@google.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <linux/keyctl.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "tmux.h"
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/* Serial of the session keyring we joined, or 0 if none. */
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static long keyring_serial;
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/*
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* Create a new session keyring since the current one belongs to the login
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* session which we're meant to outlive (and pam_keyinit(8) is likely to revoke
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* the login session's keyring when it ends).
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*/
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void
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new_session_keyring(void)
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{
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long serial;
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serial = syscall(SYS_keyctl, KEYCTL_JOIN_SESSION_KEYRING, NULL);
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if (serial == -1) {
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log_debug("%s: join failed: %s", __func__, strerror(errno));
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return;
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}
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if (syscall(SYS_keyctl, KEYCTL_LINK, KEY_SPEC_USER_KEYRING,
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KEY_SPEC_SESSION_KEYRING) == -1)
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log_debug("%s: link failed: %s", __func__, strerror(errno));
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keyring_serial = serial;
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}
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void
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revoke_session_keyring(void)
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{
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if (keyring_serial == 0)
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return;
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if (syscall(SYS_keyctl, KEYCTL_REVOKE, keyring_serial) == -1)
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log_debug("%s: revoke failed: %s", __func__, strerror(errno));
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}
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