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83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* Copyright (c) 2017-2023, Michael Santos <michael.santos@gmail.com>
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*
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* Permission to use, copy, modify, and/or 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 USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef RESTRICT_PROCESS_capsicum
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#include <sys/capsicum.h>
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#include <sys/param.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include "xmppipe.h"
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int restrict_process_init(xmppipe_state_t *state) {
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struct rlimit rl = {0};
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struct stat sb;
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if (fstat(STDOUT_FILENO, &sb) < 0)
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return -1;
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if (!S_ISREG(sb.st_mode)) {
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if (setrlimit(RLIMIT_FSIZE, &rl) < 0)
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return -1;
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}
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return setrlimit(RLIMIT_NPROC, &rl);
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}
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int restrict_process_stdin(xmppipe_state_t *state) {
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struct rlimit rl;
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cap_rights_t policy_read;
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cap_rights_t policy_write;
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cap_rights_t policy_rw;
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int fd = -1;
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fd = xmppipe_conn_fd(state);
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if (fd < 0)
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return -1;
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closefrom(fd+1);
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rl.rlim_cur = fd;
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rl.rlim_max = fd;
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if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
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return -1;
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(void)cap_rights_init(&policy_read, CAP_READ, CAP_EVENT);
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(void)cap_rights_init(&policy_write, CAP_WRITE);
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(void)cap_rights_init(&policy_rw, CAP_READ, CAP_WRITE, CAP_FSTAT, CAP_FCNTL,
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CAP_EVENT);
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if (cap_rights_limit(STDIN_FILENO, &policy_read) < 0)
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return -1;
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if (cap_rights_limit(STDOUT_FILENO, &policy_write) < 0)
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return -1;
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if (cap_rights_limit(STDERR_FILENO, &policy_write) < 0)
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return -1;
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if (cap_rights_limit(fd, &policy_rw) < 0)
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return -1;
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return cap_enter();
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}
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#endif
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