Return to perm.c CVS log

Up to [local] / src / usr.bin / at

Annotation of src/usr.bin/at/perm.c, Revision 1.4

1.4     ! millert     1: /*     $OpenBSD: perm.c,v 1.3 2002/05/11 23:16:44 millert Exp $        */
1.1       millert     2:
                      3: /*
                      4:  * perm.c - check user permission for at(1)
                      5:  * Copyright (C) 1994  Thomas Koenig
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. The name of the author(s) may not be used to endorse or promote
                     13:  *    products derived from this software without specific prior written
                     14:  *    permission.
                     15:  *
                     16:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
                     17:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     18:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     19:  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
                     20:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     21:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     22:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     23:  * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     24:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     25:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     26:  */
                     27:
                     28: #include <sys/types.h>
                     29: #include <errno.h>
                     30: #include <pwd.h>
                     31: #include <stddef.h>
                     32: #include <stdio.h>
                     33: #include <stdlib.h>
                     34: #include <string.h>
                     35: #include <unistd.h>
                     36:
                     37: #include "at.h"
                     38: #include "panic.h"
                     39: #include "pathnames.h"
                     40: #include "privs.h"
                     41:
                     42: #ifndef lint
1.4     ! millert    43: static const char rcsid[] = "$OpenBSD: perm.c,v 1.3 2002/05/11 23:16:44 millert Exp $";
1.1       millert    44: #endif
                     45:
1.2       millert    46: static int check_for_user(FILE *, const char *);
1.1       millert    47:
                     48:
                     49: static int
1.3       millert    50: check_for_user(FILE *fp, const char *name)
1.1       millert    51: {
                     52:        char *buffer;
                     53:        size_t len;
                     54:        int found = 0;
                     55:
                     56:        len = strlen(name);
                     57:        if ((buffer = malloc(len + 2)) == NULL)
                     58:                panic("Insufficient virtual memory");
                     59:
                     60:        while (fgets(buffer, len + 2, fp) != NULL) {
                     61:                if (strncmp(name, buffer, len) == 0 && buffer[len] == '\n') {
                     62:                        found = 1;
                     63:                        break;
                     64:                }
                     65:        }
                     66:        (void)fclose(fp);
                     67:        free(buffer);
                     68:        return (found);
                     69: }
                     70:
                     71:
                     72: int
1.3       millert    73: check_permission(void)
1.1       millert    74: {
                     75:        FILE *fp;
                     76:        uid_t uid = geteuid();
                     77:        struct passwd *pentry;
                     78:
                     79:        if (uid==0)
                     80:                return 1;
                     81:
                     82:        if ((pentry = getpwuid(uid)) == NULL) {
1.4     ! millert    83:                perror("Cannot access password database");
1.1       millert    84:                exit(EXIT_FAILURE);
                     85:        }
                     86:
1.3       millert    87:        PRIV_START;
1.1       millert    88:
                     89:        fp = fopen(_PATH_AT_ALLOW, "r");
                     90:
1.3       millert    91:        PRIV_END;
1.1       millert    92:
                     93:        if (fp != NULL) {
                     94:                return (check_for_user(fp, pentry->pw_name));
                     95:        } else {
1.3       millert    96:                PRIV_START;
1.1       millert    97:
                     98:                fp = fopen(_PATH_AT_DENY, "r");
                     99:
1.3       millert   100:                PRIV_END;
1.1       millert   101:
                    102:                if (fp != NULL)
                    103:                        return (!check_for_user(fp, pentry->pw_name));
                    104:                else
                    105:                        perror(_PATH_AT_DENY);
                    106:        }
                    107:        return (0);
                    108: }