diff options
Diffstat (limited to 'crypto/kerberosIV/appl/bsd/login_access.c')
-rw-r--r-- | crypto/kerberosIV/appl/bsd/login_access.c | 264 |
1 files changed, 0 insertions, 264 deletions
diff --git a/crypto/kerberosIV/appl/bsd/login_access.c b/crypto/kerberosIV/appl/bsd/login_access.c deleted file mode 100644 index 7b79dc8..0000000 --- a/crypto/kerberosIV/appl/bsd/login_access.c +++ /dev/null @@ -1,264 +0,0 @@ - /* - * This module implements a simple but effective form of login access - * control based on login names and on host (or domain) names, internet - * addresses (or network numbers), or on terminal line names in case of - * non-networked logins. Diagnostics are reported through syslog(3). - * - * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. - */ - -#include "bsd_locl.h" - -RCSID("$Id: login_access.c,v 1.19 1999/05/14 22:02:14 assar Exp $"); - -#ifdef LOGIN_ACCESS - - /* Delimiters for fields and for lists of users, ttys or hosts. */ - -static char fs[] = ":"; /* field separator */ -static char sep[] = ", \t"; /* list-element separator */ - - /* Constants to be used in assignments only, not in comparisons... */ - -#define YES 1 -#define NO 0 - - /* - * A structure to bundle up all login-related information to keep the - * functional interfaces as generic as possible. - */ -struct login_info { - struct passwd *user; - char *from; -}; - -static int list_match(char *list, struct login_info *item, - int (*match_fn)(char *, struct login_info *)); -static int user_match(char *tok, struct login_info *item); -static int from_match(char *tok, struct login_info *item); -static int string_match(char *tok, char *string); - -/* login_access - match username/group and host/tty with access control file */ - -int login_access(struct passwd *user, char *from) -{ - struct login_info item; - FILE *fp; - char line[BUFSIZ]; - char *perm; /* becomes permission field */ - char *users; /* becomes list of login names */ - char *froms; /* becomes list of terminals or hosts */ - int match = NO; - int end; - int lineno = 0; /* for diagnostics */ - char *foo; - - /* - * Bundle up the arguments to avoid unnecessary clumsiness lateron. - */ - item.user = user; - item.from = from; - - /* - * Process the table one line at a time and stop at the first match. - * Blank lines and lines that begin with a '#' character are ignored. - * Non-comment lines are broken at the ':' character. All fields are - * mandatory. The first field should be a "+" or "-" character. A - * non-existing table means no access control. - */ - - if ((fp = fopen(_PATH_LOGACCESS, "r")) != 0) { - while (!match && fgets(line, sizeof(line), fp)) { - lineno++; - if (line[end = strlen(line) - 1] != '\n') { - syslog(LOG_ERR, "%s: line %d: missing newline or line too long", - _PATH_LOGACCESS, lineno); - continue; - } - if (line[0] == '#') - continue; /* comment line */ - while (end > 0 && isspace((unsigned char)line[end - 1])) - end--; - line[end] = 0; /* strip trailing whitespace */ - if (line[0] == 0) /* skip blank lines */ - continue; - foo = NULL; - if (!(perm = strtok_r(line, fs, &foo)) - || !(users = strtok_r(NULL, fs, &foo)) - || !(froms = strtok_r(NULL, fs, &foo)) - || strtok_r(NULL, fs, &foo)) { - syslog(LOG_ERR, "%s: line %d: bad field count", - _PATH_LOGACCESS, - lineno); - continue; - } - if (perm[0] != '+' && perm[0] != '-') { - syslog(LOG_ERR, "%s: line %d: bad first field", - _PATH_LOGACCESS, - lineno); - continue; - } - match = (list_match(froms, &item, from_match) - && list_match(users, &item, user_match)); - } - fclose(fp); - } else if (errno != ENOENT) { - syslog(LOG_ERR, "cannot open %s: %m", _PATH_LOGACCESS); - } - return (match == 0 || (line[0] == '+')); -} - -/* list_match - match an item against a list of tokens with exceptions */ - -static int -list_match(char *list, - struct login_info *item, - int (*match_fn)(char *, struct login_info *)) -{ - char *tok; - int match = NO; - char *foo = NULL; - - /* - * Process tokens one at a time. We have exhausted all possible matches - * when we reach an "EXCEPT" token or the end of the list. If we do find - * a match, look for an "EXCEPT" list and recurse to determine whether - * the match is affected by any exceptions. - */ - - for (tok = strtok_r(list, sep, &foo); - tok != NULL; - tok = strtok_r(NULL, sep, &foo)) { - if (strcasecmp(tok, "EXCEPT") == 0) /* EXCEPT: give up */ - break; - if ((match = (*match_fn) (tok, item)) != 0) /* YES */ - break; - } - /* Process exceptions to matches. */ - - if (match != NO) { - while ((tok = strtok_r(NULL, sep, &foo)) && strcasecmp(tok, "EXCEPT")) - /* VOID */ ; - if (tok == 0 || list_match(NULL, item, match_fn) == NO) - return (match); - } - return (NO); -} - -/* myhostname - figure out local machine name */ - -static char *myhostname(void) -{ - static char name[MAXHOSTNAMELEN + 1] = ""; - - if (name[0] == 0) { - gethostname(name, sizeof(name)); - name[MAXHOSTNAMELEN] = 0; - } - return (name); -} - -/* netgroup_match - match group against machine or user */ - -static int netgroup_match(char *group, char *machine, char *user) -{ -#ifdef HAVE_YP_GET_DEFAULT_DOMAIN - static char *mydomain = 0; - - if (mydomain == 0) - yp_get_default_domain(&mydomain); - return (innetgr(group, machine, user, mydomain)); -#else - syslog(LOG_ERR, "NIS netgroup support not configured"); - return 0; -#endif -} - -/* user_match - match a username against one token */ - -static int user_match(char *tok, struct login_info *item) -{ - char *string = item->user->pw_name; - struct login_info fake_item; - struct group *group; - int i; - char *at; - - /* - * If a token has the magic value "ALL" the match always succeeds. - * Otherwise, return YES if the token fully matches the username, if the - * token is a group that contains the username, or if the token is the - * name of the user's primary group. - */ - - if ((at = strchr(tok + 1, '@')) != 0) { /* split user@host pattern */ - *at = 0; - fake_item.from = myhostname(); - return (user_match(tok, item) && from_match(at + 1, &fake_item)); - } else if (tok[0] == '@') { /* netgroup */ - return (netgroup_match(tok + 1, (char *) 0, string)); - } else if (string_match(tok, string)) { /* ALL or exact match */ - return (YES); - } else if ((group = getgrnam(tok)) != 0) { /* try group membership */ - if (item->user->pw_gid == group->gr_gid) - return (YES); - for (i = 0; group->gr_mem[i]; i++) - if (strcasecmp(string, group->gr_mem[i]) == 0) - return (YES); - } - return (NO); -} - -/* from_match - match a host or tty against a list of tokens */ - -static int from_match(char *tok, struct login_info *item) -{ - char *string = item->from; - int tok_len; - int str_len; - - /* - * If a token has the magic value "ALL" the match always succeeds. Return - * YES if the token fully matches the string. If the token is a domain - * name, return YES if it matches the last fields of the string. If the - * token has the magic value "LOCAL", return YES if the string does not - * contain a "." character. If the token is a network number, return YES - * if it matches the head of the string. - */ - - if (tok[0] == '@') { /* netgroup */ - return (netgroup_match(tok + 1, string, (char *) 0)); - } else if (string_match(tok, string)) { /* ALL or exact match */ - return (YES); - } else if (tok[0] == '.') { /* domain: match last fields */ - if ((str_len = strlen(string)) > (tok_len = strlen(tok)) - && strcasecmp(tok, string + str_len - tok_len) == 0) - return (YES); - } else if (strcasecmp(tok, "LOCAL") == 0) { /* local: no dots */ - if (strchr(string, '.') == 0) - return (YES); - } else if (tok[(tok_len = strlen(tok)) - 1] == '.' /* network */ - && strncmp(tok, string, tok_len) == 0) { - return (YES); - } - return (NO); -} - -/* string_match - match a string against one token */ - -static int string_match(char *tok, char *string) -{ - - /* - * If the token has the magic value "ALL" the match always succeeds. - * Otherwise, return YES if the token fully matches the string. - */ - - if (strcasecmp(tok, "ALL") == 0) { /* all: always matches */ - return (YES); - } else if (strcasecmp(tok, string) == 0) { /* try exact match */ - return (YES); - } - return (NO); -} -#endif /* LOGIN_ACCES */ |