diff options
Diffstat (limited to 'usr.bin/at/perm.c')
-rw-r--r-- | usr.bin/at/perm.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/usr.bin/at/perm.c b/usr.bin/at/perm.c new file mode 100644 index 0000000..d52fd3d --- /dev/null +++ b/usr.bin/at/perm.c @@ -0,0 +1,123 @@ +/* + * perm.c - check user permission for at(1) + * Copyright (C) 1994 Thomas Koenig + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. The name of the author(s) may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* System Headers */ + +#include <sys/types.h> +#include <errno.h> +#include <pwd.h> +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +/* Local headers */ + +#include "privs.h" +#include "at.h" + +/* Macros */ + +#define MAXUSERID 10 + +/* Structures and unions */ + + +/* File scope variables */ + +static char rcsid[] = "$Id$"; + +/* Function declarations */ + +static int check_for_user(FILE *fp,const char *name); + +/* Local functions */ + +static int check_for_user(FILE *fp,const char *name) +{ + char *buffer; + size_t len; + int found = 0; + + len = strlen(name); + buffer = mymalloc(len+2); + + while(fgets(buffer, len+2, fp) != NULL) + { + if ((strncmp(name, buffer, len) == 0) && + (buffer[len] == '\n')) + { + found = 1; + break; + } + } + fclose(fp); + free(buffer); + return found; +} +/* Global functions */ +int check_permission() +{ + FILE *fp; + uid_t uid = geteuid(); + struct passwd *pentry; + + if (uid==0) + return 1; + + if ((pentry = getpwuid(uid)) == NULL) + { + perror("Cannot access user database"); + exit(EXIT_FAILURE); + } + + PRIV_START + + fp=fopen(PERM_PATH "at.allow","r"); + + PRIV_END + + if (fp != NULL) + { + return check_for_user(fp, pentry->pw_name); + } + else + { + + PRIV_START + + fp=fopen(PERM_PATH "at.deny", "r"); + + PRIV_END + + if (fp != NULL) + { + return !check_for_user(fp, pentry->pw_name); + } + perror("at.deny"); + } + return 0; +} |