/*
*
* Copyright (c) 2001 Gert Doering. All rights reserved.
+ * Copyright (c) 2003,2004,2005,2006 Darren Tucker. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
*
*/
#include "includes.h"
+
+#include "xmalloc.h"
+#include "buffer.h"
+#include "key.h"
+#include "hostfile.h"
+#include "auth.h"
#include "ssh.h"
#include "log.h"
-#include "servconf.h"
-#include "canohost.h"
-#include "xmalloc.h"
#ifdef _AIX
+#include <errno.h>
+#if defined(HAVE_NETDB_H)
+# include <netdb.h>
+#endif
#include <uinfo.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+
+#ifdef WITH_AIXAUTHENTICATE
+# include <login.h>
+# include <userpw.h>
+# if defined(HAVE_SYS_AUDIT_H) && defined(AIX_LOGINFAILED_4ARG)
+# undef T_NULL
+# include <sys/audit.h>
+# endif
+# include <usersec.h>
+#endif
+
#include "port-aix.h"
-extern ServerOptions options;
+static char *lastlogin_msg = NULL;
+
+# ifdef HAVE_SETAUTHDB
+static char old_registry[REGISTRY_SIZE] = "";
+# endif
/*
- * AIX has a "usrinfo" area where logname and other stuff is stored -
+ * AIX has a "usrinfo" area where logname and other stuff is stored -
* a few applications actually use this and die if it's not set
*
* NOTE: TTY= should be set, but since no one uses it and it's hard to
len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name));
cp = xmalloc(len);
- i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0',
+ i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0',
pw->pw_name, '\0');
if (usrinfo(SETUINFO, cp, i) == -1)
fatal("Couldn't set usrinfo: %s", strerror(errno));
xfree(cp);
}
-#ifdef WITH_AIXAUTHENTICATE
+# ifdef WITH_AIXAUTHENTICATE
/*
* Remove embedded newlines in string (if any).
* Used before logging messages returned by AIX authentication functions
if (*--p == ' ')
*p = '\0';
}
-#endif /* WITH_AIXAUTHENTICATE */
-
-# ifdef CUSTOM_FAILED_LOGIN
+
+/*
+ * Test specifically for the case where SYSTEM == NONE and AUTH1 contains
+ * anything other than NONE or SYSTEM, which indicates that the admin has
+ * configured the account for purely AUTH1-type authentication.
+ *
+ * Since authenticate() doesn't check AUTH1, and sshd can't sanely support
+ * AUTH1 itself, in such a case authenticate() will allow access without
+ * authentation, which is almost certainly not what the admin intends.
+ *
+ * (The native tools, eg login, will process the AUTH1 list in addition to
+ * the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods
+ * have been deprecated since AIX 4.2.x and would be very difficult for sshd
+ * to support.
+ *
+ * Returns 0 if an unsupportable combination is found, 1 otherwise.
+ */
+static int
+aix_valid_authentications(const char *user)
+{
+ char *auth1, *sys, *p;
+ int valid = 1;
+
+ if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) {
+ logit("Can't retrieve attribute SYSTEM for %s: %.100s",
+ user, strerror(errno));
+ return 0;
+ }
+
+ debug3("AIX SYSTEM attribute %s", sys);
+ if (strcmp(sys, "NONE") != 0)
+ return 1; /* not "NONE", so is OK */
+
+ if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) {
+ logit("Can't retrieve attribute auth1 for %s: %.100s",
+ user, strerror(errno));
+ return 0;
+ }
+
+ p = auth1;
+ /* A SEC_LIST is concatenated strings, ending with two NULs. */
+ while (p[0] != '\0' && p[1] != '\0') {
+ debug3("AIX auth1 attribute list member %s", p);
+ if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) {
+ logit("Account %s has unsupported auth1 value '%s'",
+ user, p);
+ valid = 0;
+ }
+ p += strlen(p) + 1;
+ }
+
+ return (valid);
+}
+
+/*
+ * Do authentication via AIX's authenticate routine. We loop until the
+ * reenter parameter is 0, but normally authenticate is called only once.
+ *
+ * Note: this function returns 1 on success, whereas AIX's authenticate()
+ * returns 0.
+ */
+int
+sys_auth_passwd(Authctxt *ctxt, const char *password)
+{
+ char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name;
+ int authsuccess = 0, expired, reenter, result;
+
+ do {
+ result = authenticate((char *)name, (char *)password, &reenter,
+ &authmsg);
+ aix_remove_embedded_newlines(authmsg);
+ debug3("AIX/authenticate result %d, authmsg %.100s", result,
+ authmsg);
+ } while (reenter);
+
+ if (!aix_valid_authentications(name))
+ result = -1;
+
+ if (result == 0) {
+ authsuccess = 1;
+
+ /*
+ * Record successful login. We don't have a pty yet, so just
+ * label the line as "ssh"
+ */
+ aix_setauthdb(name);
+
+ /*
+ * Check if the user's password is expired.
+ */
+ expired = passwdexpired(name, &msg);
+ if (msg && *msg) {
+ buffer_append(ctxt->loginmsg, msg, strlen(msg));
+ aix_remove_embedded_newlines(msg);
+ }
+ debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg);
+
+ switch (expired) {
+ case 0: /* password not expired */
+ break;
+ case 1: /* expired, password change required */
+ ctxt->force_pwchange = 1;
+ break;
+ default: /* user can't change(2) or other error (-1) */
+ logit("Password can't be changed for user %s: %.100s",
+ name, msg);
+ if (msg)
+ xfree(msg);
+ authsuccess = 0;
+ }
+
+ aix_restoreauthdb();
+ }
+
+ if (authmsg != NULL)
+ xfree(authmsg);
+
+ return authsuccess;
+}
+
+/*
+ * Check if specified account is permitted to log in.
+ * Returns 1 if login is allowed, 0 if not allowed.
+ */
+int
+sys_auth_allowed_user(struct passwd *pw, Buffer *loginmsg)
+{
+ char *msg = NULL;
+ int result, permitted = 0;
+ struct stat st;
+
+ /*
+ * Don't perform checks for root account (PermitRootLogin controls
+ * logins via ssh) or if running as non-root user (since
+ * loginrestrictions will always fail due to insufficient privilege).
+ */
+ if (pw->pw_uid == 0 || geteuid() != 0) {
+ debug3("%s: not checking", __func__);
+ return 1;
+ }
+
+ result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg);
+ if (result == 0)
+ permitted = 1;
+ /*
+ * If restricted because /etc/nologin exists, the login will be denied
+ * in session.c after the nologin message is sent, so allow for now
+ * and do not append the returned message.
+ */
+ if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0)
+ permitted = 1;
+ else if (msg != NULL)
+ buffer_append(loginmsg, msg, strlen(msg));
+ if (msg == NULL)
+ msg = xstrdup("(none)");
+ aix_remove_embedded_newlines(msg);
+ debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg);
+
+ if (!permitted)
+ logit("Login restricted for %s: %.100s", pw->pw_name, msg);
+ xfree(msg);
+ return permitted;
+}
+
+int
+sys_auth_record_login(const char *user, const char *host, const char *ttynm,
+ Buffer *loginmsg)
+{
+ char *msg = NULL;
+ int success = 0;
+
+ aix_setauthdb(user);
+ if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
+ success = 1;
+ if (msg != NULL) {
+ debug("AIX/loginsuccess: msg %s", msg);
+ if (lastlogin_msg == NULL)
+ lastlogin_msg = msg;
+ }
+ }
+ aix_restoreauthdb();
+ return (success);
+}
+
+char *
+sys_auth_get_lastlogin_msg(const char *user, uid_t uid)
+{
+ char *msg = lastlogin_msg;
+
+ lastlogin_msg = NULL;
+ return msg;
+}
+
+# ifdef CUSTOM_FAILED_LOGIN
/*
* record_failed_login: generic "login failed" interface function
*/
void
-record_failed_login(const char *user, const char *ttyname)
+record_failed_login(const char *user, const char *hostname, const char *ttyname)
{
- char *hostname = get_canonical_hostname(options.use_dns);
-
if (geteuid() != 0)
return;
aix_setauthdb(user);
-# ifdef AIX_LOGINFAILED_4ARG
- loginfailed((char *)user, hostname, (char *)ttyname, AUDIT_FAIL_AUTH);
-# else
- loginfailed((char *)user, hostname, (char *)ttyname);
-# endif
+# ifdef AIX_LOGINFAILED_4ARG
+ loginfailed((char *)user, (char *)hostname, (char *)ttyname,
+ AUDIT_FAIL_AUTH);
+# else
+ loginfailed((char *)user, (char *)hostname, (char *)ttyname);
+# endif
+ aix_restoreauthdb();
}
+# endif /* CUSTOM_FAILED_LOGIN */
/*
* If we have setauthdb, retrieve the password registry for the user's
- * account then feed it to setauthdb. This may load registry-specific method
- * code. If we don't have setauthdb or have already called it this is a no-op.
+ * account then feed it to setauthdb. This will mean that subsequent AIX auth
+ * functions will only use the specified loadable module. If we don't have
+ * setauthdb this is a no-op.
*/
void
aix_setauthdb(const char *user)
{
# ifdef HAVE_SETAUTHDB
- static char *registry = NULL;
-
- if (registry != NULL) /* have already done setauthdb */
- return;
+ char *registry;
if (setuserdb(S_READ) == -1) {
debug3("%s: Could not open userdb to read", __func__);
}
if (getuserattr((char *)user, S_REGISTRY, ®istry, SEC_CHAR) == 0) {
- if (setauthdb(registry, NULL) == 0)
- debug3("%s: AIX/setauthdb set registry %s", __func__,
- registry);
+ if (setauthdb(registry, old_registry) == 0)
+ debug3("AIX/setauthdb set registry '%s'", registry);
else
- debug3("%s: AIX/setauthdb set registry %s failed: %s",
- __func__, registry, strerror(errno));
+ debug3("AIX/setauthdb set registry '%s' failed: %s",
+ registry, strerror(errno));
} else
debug3("%s: Could not read S_REGISTRY for user: %s", __func__,
strerror(errno));
enduserdb();
-# endif
+# endif /* HAVE_SETAUTHDB */
}
-# endif /* CUSTOM_FAILED_LOGIN */
-#endif /* _AIX */
+/*
+ * Restore the user's registry settings from old_registry.
+ * Note that if the first aix_setauthdb fails, setauthdb("") is still safe
+ * (it restores the system default behaviour). If we don't have setauthdb,
+ * this is a no-op.
+ */
+void
+aix_restoreauthdb(void)
+{
+# ifdef HAVE_SETAUTHDB
+ if (setauthdb(old_registry, NULL) == 0)
+ debug3("%s: restoring old registry '%s'", __func__,
+ old_registry);
+ else
+ debug3("%s: failed to restore old registry %s", __func__,
+ old_registry);
+# endif /* HAVE_SETAUTHDB */
+}
+
+# endif /* WITH_AIXAUTHENTICATE */
+
+# if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO)
+# undef getnameinfo
+/*
+ * For some reason, AIX's getnameinfo will refuse to resolve the all-zeros
+ * IPv6 address into its textual representation ("::"), so we wrap it
+ * with a function that will.
+ */
+int
+sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
+ size_t hostlen, char *serv, size_t servlen, int flags)
+{
+ struct sockaddr_in6 *sa6;
+ u_int32_t *a6;
+
+ if (flags & (NI_NUMERICHOST|NI_NUMERICSERV) &&
+ sa->sa_family == AF_INET6) {
+ sa6 = (struct sockaddr_in6 *)sa;
+ a6 = sa6->sin6_addr.u6_addr.u6_addr32;
+
+ if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) {
+ strlcpy(host, "::", hostlen);
+ snprintf(serv, servlen, "%d", sa6->sin6_port);
+ return 0;
+ }
+ }
+ return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
+}
+# endif /* AIX_GETNAMEINFO_HACK */
+
+# if defined(USE_GETGRSET)
+# include <stdlib.h>
+int
+getgrouplist(const char *user, gid_t pgid, gid_t *groups, int *grpcnt)
+{
+ char *cp, *grplist, *grp;
+ gid_t gid;
+ int ret = 0, ngroups = 0, maxgroups;
+ long l;
+
+ maxgroups = *grpcnt;
+
+ if ((cp = grplist = getgrset(user)) == NULL)
+ return -1;
+
+ /* handle zero-length case */
+ if (maxgroups <= 0) {
+ *grpcnt = 0;
+ return -1;
+ }
+
+ /* copy primary group */
+ groups[ngroups++] = pgid;
+
+ /* copy each entry from getgrset into group list */
+ while ((grp = strsep(&grplist, ",")) != NULL) {
+ l = strtol(grp, NULL, 10);
+ if (ngroups >= maxgroups || l == LONG_MIN || l == LONG_MAX) {
+ ret = -1;
+ goto out;
+ }
+ gid = (gid_t)l;
+ if (gid == pgid)
+ continue; /* we have already added primary gid */
+ groups[ngroups++] = gid;
+ }
+out:
+ free(cp);
+ *grpcnt = ngroups;
+ return ret;
+}
+# endif /* USE_GETGRSET */
+
+#endif /* _AIX */
andersk / gssapi-openssh.git / blobdiff