diff options
author | markm <markm@FreeBSD.org> | 1999-09-19 14:19:32 +0000 |
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committer | markm <markm@FreeBSD.org> | 1999-09-19 14:19:32 +0000 |
commit | fe83e8abf357ee11114856a5278bb38431a9517c (patch) | |
tree | 36ce70fe2e8419130e546c38a7790e8ab224a362 /crypto/kerberosIV/lib/roken/iruserok.c | |
parent | a8a89cfaf983bc64f4b42f7c35209a5a36dd0fe8 (diff) | |
download | FreeBSD-src-fe83e8abf357ee11114856a5278bb38431a9517c.zip FreeBSD-src-fe83e8abf357ee11114856a5278bb38431a9517c.tar.gz |
Clean import of KTH krb4-0.10.1.
Diffstat (limited to 'crypto/kerberosIV/lib/roken/iruserok.c')
-rw-r--r-- | crypto/kerberosIV/lib/roken/iruserok.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/roken/iruserok.c b/crypto/kerberosIV/lib/roken/iruserok.c new file mode 100644 index 0000000..63eaccf --- /dev/null +++ b/crypto/kerberosIV/lib/roken/iruserok.c @@ -0,0 +1,294 @@ +/* + * Copyright (c) 1983, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * 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. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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, WHETHER 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. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +RCSID("$Id: iruserok.c,v 1.21 1999/03/11 14:04:15 joda Exp $"); +#endif + +#include <stdio.h> +#include <ctype.h> +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_NETINET_IN_H +#include <netinet/in.h> +#endif +#ifdef HAVE_NETINET_IN6_H +#include <netinet/in6.h> +#endif +#ifdef HAVE_NETINET6_IN6_H +#include <netinet6/in6.h> +#endif +#ifdef HAVE_RPCSVC_YPCLNT_H +#include <rpcsvc/ypclnt.h> +#endif + +#ifdef HAVE_NETDB_H +#include <netdb.h> +#endif +#ifdef HAVE_ARPA_INET_H +#include <arpa/inet.h> +#endif + +#include "roken.h" + +int __check_rhosts_file = 1; +char *__rcmd_errstr = 0; + +/* + * Returns "true" if match, 0 if no match. + */ +static +int +__icheckhost(unsigned raddr, const char *lhost) +{ + struct hostent *hp; + u_long laddr; + char **pp; + + /* Try for raw ip address first. */ + if (isdigit((unsigned char)*lhost) + && (long)(laddr = inet_addr(lhost)) != -1) + return (raddr == laddr); + + /* Better be a hostname. */ + if ((hp = gethostbyname(lhost)) == NULL) + return (0); + + /* Spin through ip addresses. */ + for (pp = hp->h_addr_list; *pp; ++pp) + if (memcmp(&raddr, *pp, sizeof(u_long)) == 0) + return (1); + + /* No match. */ + return (0); +} + +/* + * Returns 0 if ok, -1 if not ok. + */ +static +int +__ivaliduser(FILE *hostf, unsigned raddr, const char *luser, + const char *ruser) +{ + char *user, *p; + int ch; + char buf[MaxHostNameLen + 128]; /* host + login */ + char hname[MaxHostNameLen]; + struct hostent *hp; + /* Presumed guilty until proven innocent. */ + int userok = 0, hostok = 0; +#ifdef HAVE_YP_GET_DEFAULT_DOMAIN + char *ypdomain; + + if (yp_get_default_domain(&ypdomain)) + ypdomain = NULL; +#else +#define ypdomain NULL +#endif + /* We need to get the damn hostname back for netgroup matching. */ + if ((hp = gethostbyaddr((char *)&raddr, + sizeof(u_long), + AF_INET)) == NULL) + return (-1); + strcpy_truncate(hname, hp->h_name, sizeof(hname)); + + while (fgets(buf, sizeof(buf), hostf)) { + p = buf; + /* Skip lines that are too long. */ + if (strchr(p, '\n') == NULL) { + while ((ch = getc(hostf)) != '\n' && ch != EOF); + continue; + } + if (*p == '\n' || *p == '#') { + /* comment... */ + continue; + } + while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { + if (isupper((unsigned char)*p)) + *p = tolower((unsigned char)*p); + p++; + } + if (*p == ' ' || *p == '\t') { + *p++ = '\0'; + while (*p == ' ' || *p == '\t') + p++; + user = p; + while (*p != '\n' && *p != ' ' && + *p != '\t' && *p != '\0') + p++; + } else + user = p; + *p = '\0'; + /* + * Do +/- and +@/-@ checking. This looks really nasty, + * but it matches SunOS's behavior so far as I can tell. + */ + switch(buf[0]) { + case '+': + if (!buf[1]) { /* '+' matches all hosts */ + hostok = 1; + break; + } + if (buf[1] == '@') /* match a host by netgroup */ + hostok = innetgr((char *)&buf[2], + (char *)&hname, NULL, ypdomain); + else /* match a host by addr */ + hostok = __icheckhost(raddr,(char *)&buf[1]); + break; + case '-': /* reject '-' hosts and all their users */ + if (buf[1] == '@') { + if (innetgr((char *)&buf[2], + (char *)&hname, NULL, ypdomain)) + return(-1); + } else { + if (__icheckhost(raddr,(char *)&buf[1])) + return(-1); + } + break; + default: /* if no '+' or '-', do a simple match */ + hostok = __icheckhost(raddr, buf); + break; + } + switch(*user) { + case '+': + if (!*(user+1)) { /* '+' matches all users */ + userok = 1; + break; + } + if (*(user+1) == '@') /* match a user by netgroup */ + userok = innetgr(user+2, NULL, (char *)ruser, + ypdomain); + else /* match a user by direct specification */ + userok = !(strcmp(ruser, user+1)); + break; + case '-': /* if we matched a hostname, */ + if (hostok) { /* check for user field rejections */ + if (!*(user+1)) + return(-1); + if (*(user+1) == '@') { + if (innetgr(user+2, NULL, + (char *)ruser, ypdomain)) + return(-1); + } else { + if (!strcmp(ruser, user+1)) + return(-1); + } + } + break; + default: /* no rejections: try to match the user */ + if (hostok) + userok = !(strcmp(ruser,*user ? user : luser)); + break; + } + if (hostok && userok) + return(0); + } + return (-1); +} + +/* + * New .rhosts strategy: We are passed an ip address. We spin through + * hosts.equiv and .rhosts looking for a match. When the .rhosts only + * has ip addresses, we don't have to trust a nameserver. When it + * contains hostnames, we spin through the list of addresses the nameserver + * gives us and look for a match. + * + * Returns 0 if ok, -1 if not ok. + */ +int +iruserok(unsigned raddr, int superuser, const char *ruser, const char *luser) +{ + char *cp; + struct stat sbuf; + struct passwd *pwd; + FILE *hostf; + uid_t uid; + int first; + char pbuf[MaxPathLen]; + + first = 1; + hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); +again: + if (hostf) { + if (__ivaliduser(hostf, raddr, luser, ruser) == 0) { + fclose(hostf); + return (0); + } + fclose(hostf); + } + if (first == 1 && (__check_rhosts_file || superuser)) { + first = 0; + if ((pwd = k_getpwnam((char*)luser)) == NULL) + return (-1); + snprintf (pbuf, sizeof(pbuf), "%s/.rhosts", pwd->pw_dir); + + /* + * Change effective uid while opening .rhosts. If root and + * reading an NFS mounted file system, can't read files that + * are protected read/write owner only. + */ + uid = geteuid(); + seteuid(pwd->pw_uid); + hostf = fopen(pbuf, "r"); + seteuid(uid); + + if (hostf == NULL) + return (-1); + /* + * If not a regular file, or is owned by someone other than + * user or root or if writeable by anyone but the owner, quit. + */ + cp = NULL; + if (lstat(pbuf, &sbuf) < 0) + cp = ".rhosts lstat failed"; + else if (!S_ISREG(sbuf.st_mode)) + cp = ".rhosts not regular file"; + else if (fstat(fileno(hostf), &sbuf) < 0) + cp = ".rhosts fstat failed"; + else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) + cp = "bad .rhosts owner"; + else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) + cp = ".rhosts writeable by other than owner"; + /* If there were any problems, quit. */ + if (cp) { + __rcmd_errstr = cp; + fclose(hostf); + return (-1); + } + goto again; + } + return (-1); +} |