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-rw-r--r--src/modules/rlm_unix/rlm_unix.c546
1 files changed, 546 insertions, 0 deletions
diff --git a/src/modules/rlm_unix/rlm_unix.c b/src/modules/rlm_unix/rlm_unix.c
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+++ b/src/modules/rlm_unix/rlm_unix.c
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+/*
+ * This program is is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+/**
+ * $Id$
+ * @file rlm_unix.c
+ * @brief Unixy things
+ *
+ * authentication: Unix user authentication
+ * accounting: Functions to write radwtmp file.
+ * Also contains handler for "Group".
+ *
+ * @copyright 2000,2006 The FreeRADIUS server project
+ * @copyright 2000 Jeff Carneal <jeff@apex.net>
+ * @copyright 2000 Alan Curry <pacman@world.std.com>
+ */
+RCSID("$Id$")
+USES_APPLE_DEPRECATED_API
+
+#include <freeradius-devel/radiusd.h>
+
+#include <grp.h>
+#include <pwd.h>
+#include <sys/stat.h>
+
+#include "config.h"
+
+#ifdef HAVE_SHADOW_H
+# include <shadow.h>
+#endif
+
+#ifdef OSFC2
+# include <sys/security.h>
+# include <prot.h>
+#endif
+
+#ifdef OSFSIA
+# include <sia.h>
+# include <siad.h>
+#endif
+
+#include <freeradius-devel/modules.h>
+#include <freeradius-devel/sysutmp.h>
+
+static char trans[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+#define ENC(c) trans[c]
+
+typedef struct rlm_unix {
+ char const *name; //!< Instance name.
+ char const *radwtmp;
+} rlm_unix_t;
+
+static const CONF_PARSER module_config[] = {
+ { "radwtmp", FR_CONF_OFFSET(PW_TYPE_FILE_OUTPUT | PW_TYPE_REQUIRED, rlm_unix_t, radwtmp), "NULL" },
+ CONF_PARSER_TERMINATOR
+};
+
+/*
+ * The Group = handler.
+ */
+static int groupcmp(UNUSED void *instance, REQUEST *request, UNUSED VALUE_PAIR *req_vp,
+ VALUE_PAIR *check, UNUSED VALUE_PAIR *check_pairs,
+ UNUSED VALUE_PAIR **reply_pairs)
+{
+ struct passwd *pwd;
+ struct group *grp;
+ char **member;
+ int retval = -1;
+
+ /*
+ * No user name, can't compare.
+ */
+ if (!request->username) return -1;
+
+ if (rad_getpwnam(request, &pwd, request->username->vp_strvalue) < 0) {
+ RDEBUG("%s", fr_strerror());
+ return -1;
+ }
+
+ if (rad_getgrnam(request, &grp, check->vp_strvalue) < 0) {
+ RDEBUG("%s", fr_strerror());
+ talloc_free(pwd);
+ return -1;
+ }
+
+ /*
+ * The users default group isn't the one we're looking for,
+ * look through the list of group members.
+ */
+ if (pwd->pw_gid == grp->gr_gid) {
+ retval = 0;
+
+ } else {
+ for (member = grp->gr_mem; *member && retval; member++) {
+ if (strcmp(*member, pwd->pw_name) == 0) {
+ retval = 0;
+ break;
+ }
+ }
+ }
+
+ /* lifo */
+ talloc_free(grp);
+ talloc_free(pwd);
+
+ return retval;
+}
+
+
+/*
+ * Read the config
+ */
+static int mod_bootstrap(CONF_SECTION *conf, void *instance)
+{
+ rlm_unix_t *inst = instance;
+
+ DICT_ATTR const *group_da, *user_name_da;
+
+ inst->name = cf_section_name2(conf);
+ if (!inst->name) {
+ inst->name = cf_section_name1(conf);
+ }
+
+ group_da = dict_attrbyvalue(PW_GROUP, 0);
+ if (!group_da) {
+ ERROR("rlm_unix (%s): 'Group' attribute not found in dictionary", inst->name);
+ return -1;
+ }
+
+ user_name_da = dict_attrbyvalue(PW_USER_NAME, 0);
+ if (!user_name_da) {
+ ERROR("rlm_unix (%s): 'User-Name' attribute not found in dictionary", inst->name);
+ return -1;
+ }
+
+ /* FIXME - delay these until a group file has been read so we know
+ * groupcmp can actually do something */
+ paircompare_register(group_da, user_name_da, false, groupcmp, inst);
+
+#ifdef PW_GROUP_NAME /* compat */
+ {
+ DICT_ATTR const *group_name_da;
+
+ group_name_da = dict_attrbyvalue(PW_GROUP_NAME, 0);
+ if (!group_name_da) {
+ ERROR("rlm_unix (%s): 'Group-Name' attribute not found in dictionary", inst->name);
+ return -1;
+ }
+ paircompare_register(group_name_da, user_name_da, true, groupcmp, inst);
+ }
+#endif
+
+ if (paircompare_register_byname("Unix-Group", user_name_da, false, groupcmp, inst) < 0) {
+ ERROR("rlm_unix (%s): Failed registering Unix-Group: %s", inst->name,
+ fr_strerror());
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Pull the users password from where-ever, and add it to
+ * the given vp list.
+ */
+static rlm_rcode_t CC_HINT(nonnull) mod_authorize(UNUSED void *instance, REQUEST *request)
+{
+ char const *name;
+ char const *encrypted_pass;
+#ifdef HAVE_GETSPNAM
+ struct spwd *spwd = NULL;
+#endif
+#ifdef OSFC2
+ struct pr_passwd *pr_pw;
+#else
+ struct passwd *pwd;
+#endif
+#ifdef HAVE_GETUSERSHELL
+ char *shell;
+#endif
+ VALUE_PAIR *vp;
+
+ /*
+ * We can only authenticate user requests which HAVE
+ * a User-Name attribute.
+ */
+ if (!request->username) {
+ return RLM_MODULE_NOOP;
+ }
+
+ name = request->username->vp_strvalue;
+ encrypted_pass = NULL;
+
+#ifdef OSFC2
+ if ((pr_pw = getprpwnam(name)) == NULL)
+ return RLM_MODULE_NOTFOUND;
+ encrypted_pass = pr_pw->ufld.fd_encrypt;
+
+ /*
+ * Check if account is locked.
+ */
+ if (pr_pw->uflg.fg_lock!=1) {
+ AUTH("rlm_unix: [%s]: account locked", name);
+ return RLM_MODULE_USERLOCK;
+ }
+#else /* OSFC2 */
+ if ((pwd = getpwnam(name)) == NULL) {
+ return RLM_MODULE_NOTFOUND;
+ }
+ encrypted_pass = pwd->pw_passwd;
+#endif /* OSFC2 */
+
+#ifdef HAVE_GETSPNAM
+ /*
+ * See if there is a shadow password.
+ *
+ * Only query the _system_ shadow file if the encrypted
+ * password from the passwd file is < 10 characters (i.e.
+ * a valid password would never crypt() to it). This will
+ * prevents users from using NULL password fields as things
+ * stand right now.
+ */
+ if ((!encrypted_pass) || (strlen(encrypted_pass) < 10)) {
+ if ((spwd = getspnam(name)) == NULL) {
+ return RLM_MODULE_NOTFOUND;
+ }
+ encrypted_pass = spwd->sp_pwdp;
+ }
+#endif /* HAVE_GETSPNAM */
+
+/*
+ * These require 'pwd != NULL', which isn't true on OSFC2
+ */
+#ifndef OSFC2
+#ifdef DENY_SHELL
+ /*
+ * Users with a particular shell are denied access
+ */
+ if (strcmp(pwd->pw_shell, DENY_SHELL) == 0) {
+ RAUTH("rlm_unix: [%s]: invalid shell", name);
+ return RLM_MODULE_REJECT;
+ }
+#endif
+
+#ifdef HAVE_GETUSERSHELL
+ /*
+ * Check /etc/shells for a valid shell. If that file
+ * contains /RADIUSD/ANY/SHELL then any shell will do.
+ */
+ while ((shell = getusershell()) != NULL) {
+ if (strcmp(shell, pwd->pw_shell) == 0 ||
+ strcmp(shell, "/RADIUSD/ANY/SHELL") == 0) {
+ break;
+ }
+ }
+ endusershell();
+ if (!shell) {
+ RAUTH("[%s]: invalid shell [%s]",
+ name, pwd->pw_shell);
+ return RLM_MODULE_REJECT;
+ }
+#endif
+#endif /* OSFC2 */
+
+#if defined(HAVE_GETSPNAM) && !defined(M_UNIX)
+ /*
+ * Check if password has expired.
+ */
+ if (spwd && spwd->sp_lstchg > 0 && spwd->sp_max >= 0 &&
+ (request->timestamp / 86400) > (spwd->sp_lstchg + spwd->sp_max)) {
+ RAUTH("[%s]: password has expired", name);
+ return RLM_MODULE_REJECT;
+ }
+ /*
+ * Check if account has expired.
+ */
+ if (spwd && spwd->sp_expire > 0 &&
+ (request->timestamp / 86400) > spwd->sp_expire) {
+ RAUTH("[%s]: account has expired", name);
+ return RLM_MODULE_REJECT;
+ }
+#endif
+
+#if defined(__FreeBSD__) || defined(bsdi) || defined(_PWF_EXPIRE)
+ /*
+ * Check if password has expired.
+ */
+ if ((pwd->pw_expire > 0) &&
+ (request->timestamp > pwd->pw_expire)) {
+ RAUTH("[%s]: password has expired", name);
+ return RLM_MODULE_REJECT;
+ }
+#endif
+
+ /*
+ * We might have a passwordless account.
+ *
+ * FIXME: Maybe add Auth-Type := Accept?
+ */
+ if (encrypted_pass[0] == 0)
+ return RLM_MODULE_NOOP;
+
+ vp = pair_make_config("Crypt-Password", encrypted_pass, T_OP_SET);
+ if (!vp) return RLM_MODULE_FAIL;
+
+ return RLM_MODULE_UPDATED;
+}
+
+
+/*
+ * UUencode 4 bits base64. We use this to turn a 4 byte field
+ * (an IP address) into 6 bytes of ASCII. This is used for the
+ * wtmp file if we didn't find a short name in the naslist file.
+ */
+static char *uue(void *in)
+{
+ int i;
+ static unsigned char res[7];
+ unsigned char *data = (unsigned char *)in;
+
+ res[0] = ENC( data[0] >> 2 );
+ res[1] = ENC( ((data[0] << 4) & 060) + ((data[1] >> 4) & 017) );
+ res[2] = ENC( ((data[1] << 2) & 074) + ((data[2] >> 6) & 03) );
+ res[3] = ENC( data[2] & 077 );
+
+ res[4] = ENC( data[3] >> 2 );
+ res[5] = ENC( (data[3] << 4) & 060 );
+ res[6] = 0;
+
+ for(i = 0; i < 6; i++) {
+ if (res[i] == ' ') res[i] = '`';
+ if (res[i] < 32 || res[i] > 127)
+ printf("uue: protocol error ?!\n");
+ }
+ return (char *)res;
+}
+
+
+/*
+ * Unix accounting - write a wtmp file.
+ */
+static rlm_rcode_t CC_HINT(nonnull) mod_accounting(void *instance, REQUEST *request)
+{
+ VALUE_PAIR *vp;
+ vp_cursor_t cursor;
+ FILE *fp;
+ struct utmp ut;
+ time_t t;
+ char buf[64];
+ char const *s;
+ int delay = 0;
+ int status = -1;
+ int nas_address = 0;
+ int framed_address = 0;
+#ifdef USER_PROCESS
+ int protocol = -1;
+#endif
+ uint32_t nas_port = 0;
+ bool port_seen = true;
+ rlm_unix_t *inst = (rlm_unix_t *) instance;
+
+ /*
+ * No radwtmp. Don't do anything.
+ */
+ if (!inst->radwtmp) {
+ RDEBUG2("No radwtmp file configured. Ignoring accounting request");
+ return RLM_MODULE_NOOP;
+ }
+
+ if (request->packet->src_ipaddr.af != AF_INET) {
+ RDEBUG2("IPv6 is not supported for the radwtmp file.");
+ return RLM_MODULE_NOOP;
+ }
+
+ /*
+ * Which type is this.
+ */
+ if ((vp = fr_pair_find_by_num(request->packet->vps, PW_ACCT_STATUS_TYPE, 0, TAG_ANY))==NULL) {
+ RDEBUG("no Accounting-Status-Type attribute in request");
+ return RLM_MODULE_NOOP;
+ }
+ status = vp->vp_integer;
+
+ /*
+ * FIXME: handle PW_STATUS_ALIVE like 1.5.4.3 did.
+ */
+ if (status != PW_STATUS_START &&
+ status != PW_STATUS_STOP)
+ return RLM_MODULE_NOOP;
+
+ /*
+ * We're only interested in accounting messages
+ * with a username in it.
+ */
+ if (fr_pair_find_by_num(request->packet->vps, PW_USER_NAME, 0, TAG_ANY) == NULL)
+ return RLM_MODULE_NOOP;
+
+ t = request->timestamp;
+ memset(&ut, 0, sizeof(ut));
+
+ /*
+ * First, find the interesting attributes.
+ */
+ for (vp = fr_cursor_init(&cursor, &request->packet->vps);
+ vp;
+ vp = fr_cursor_next(&cursor)) {
+ if (!vp->da->vendor) switch (vp->da->attr) {
+ case PW_USER_NAME:
+ if (vp->vp_length >= sizeof(ut.ut_name)) {
+ memcpy(ut.ut_name, vp->vp_strvalue, sizeof(ut.ut_name));
+ } else {
+ strlcpy(ut.ut_name, vp->vp_strvalue, sizeof(ut.ut_name));
+ }
+ break;
+
+ case PW_LOGIN_IP_HOST:
+ case PW_FRAMED_IP_ADDRESS:
+ framed_address = vp->vp_ipaddr;
+ break;
+#ifdef USER_PROCESS
+ case PW_FRAMED_PROTOCOL:
+ protocol = vp->vp_integer;
+ break;
+#endif
+ case PW_NAS_IP_ADDRESS:
+ nas_address = vp->vp_ipaddr;
+ break;
+
+ case PW_NAS_PORT:
+ nas_port = vp->vp_integer;
+ port_seen = true;
+ break;
+
+ case PW_ACCT_DELAY_TIME:
+ delay = vp->vp_integer;
+ break;
+ }
+ }
+
+ /*
+ * We don't store !root sessions, or sessions
+ * where we didn't see a NAS-Port attribute.
+ */
+ if (strncmp(ut.ut_name, "!root", sizeof(ut.ut_name)) == 0 || !port_seen)
+ return RLM_MODULE_NOOP;
+
+ /*
+ * If we didn't find out the NAS address, use the
+ * originator's IP address.
+ */
+ if (nas_address == 0) {
+ nas_address = request->packet->src_ipaddr.ipaddr.ip4addr.s_addr;
+ }
+ s = request->client->shortname;
+ if (!s || s[0] == 0) s = uue(&(nas_address));
+
+#ifdef __linux__
+ /*
+ * Linux has a field for the client address.
+ */
+ ut.ut_addr = framed_address;
+#endif
+ /*
+ * We use the tty field to store the terminal servers' port
+ * and address so that the tty field is unique.
+ */
+ snprintf(buf, sizeof(buf), "%03d:%s", nas_port, s);
+ strlcpy(ut.ut_line, buf, sizeof(ut.ut_line));
+
+ /*
+ * We store the dynamic IP address in the hostname field.
+ */
+#ifdef UT_HOSTSIZE
+ if (framed_address) {
+ ip_ntoa(buf, framed_address);
+ strlcpy(ut.ut_host, buf, sizeof(ut.ut_host));
+ }
+#endif
+#ifdef HAVE_UTMPX_H
+ ut.ut_xtime = t- delay;
+#else
+ ut.ut_time = t - delay;
+#endif
+#ifdef USER_PROCESS
+ /*
+ * And we can use the ID field to store
+ * the protocol.
+ */
+ if (protocol == PW_PPP)
+ strcpy(ut.ut_id, "P");
+ else if (protocol == PW_SLIP)
+ strcpy(ut.ut_id, "S");
+ else
+ strcpy(ut.ut_id, "T");
+ ut.ut_type = status == PW_STATUS_STOP ? DEAD_PROCESS : USER_PROCESS;
+#endif
+ if (status == PW_STATUS_STOP)
+ ut.ut_name[0] = 0;
+
+ /*
+ * Write a RADIUS wtmp log file.
+ *
+ * Try to open the file if we can't, we don't write the
+ * wtmp file. If we can try to write. If we fail,
+ * return RLM_MODULE_FAIL ..
+ */
+ if ((fp = fopen(inst->radwtmp, "a")) != NULL) {
+ if ((fwrite(&ut, sizeof(ut), 1, fp)) != 1) {
+ fclose(fp);
+ return RLM_MODULE_FAIL;
+ }
+ fclose(fp);
+ } else
+ return RLM_MODULE_FAIL;
+
+ return RLM_MODULE_OK;
+}
+
+/* globally exported name */
+extern module_t rlm_unix;
+module_t rlm_unix = {
+ .magic = RLM_MODULE_INIT,
+ .name = "unix",
+ .type = RLM_TYPE_THREAD_UNSAFE,
+ .inst_size = sizeof(rlm_unix_t),
+ .config = module_config,
+ .bootstrap = mod_bootstrap,
+ .methods = {
+ [MOD_AUTHORIZE] = mod_authorize,
+ [MOD_ACCOUNTING] = mod_accounting
+ },
+};
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