X-Git-Url: http://andersk.mit.edu/gitweb/gssapi-openssh.git/blobdiff_plain/44a053a3174c2aaef640d35350c460003288be99..5107d8f0aec2362143029410cc3c812409924b21:/openssh/openbsd-compat/port-aix.c

diff --git a/openssh/openbsd-compat/port-aix.c b/openssh/openbsd-compat/port-aix.c
index ca0a88e..0723e98 100644
--- a/openssh/openbsd-compat/port-aix.c
+++ b/openssh/openbsd-compat/port-aix.c
@@ -1,31 +1,398 @@
+/*
+ *
+ * Copyright (c) 2001 Gert Doering.  All rights reserved.
+ * Copyright (c) 2003,2004,2005 Darren Tucker.  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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+ *
+ */
 #include "includes.h"
 
+#include "xmalloc.h"
+#include "buffer.h"
+#include "key.h"
+#include "hostfile.h"
+#include "auth.h"
+#include "ssh.h"
+#include "log.h"
+
 #ifdef _AIX
 
+#include <errno.h>
+#if defined(HAVE_NETDB_H)
+# include <netdb.h>
+#endif
 #include <uinfo.h>
-#include <../xmalloc.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"
+
+# ifdef HAVE_SETAUTHDB
+static char old_registry[REGISTRY_SIZE] = "";
+# endif
 
 /*
- * 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
+ * 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
+ * acquire due to privsep code.  We will just drop support.
  */
 void
-aix_usrinfo(struct passwd *pw, char *tty, int ttyfd) 
+aix_usrinfo(struct passwd *pw)
 {
 	u_int i;
-	char *cp=NULL;
+	size_t len;
+	char *cp;
+
+	len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name));
+	cp = xmalloc(len);
 
-	if (ttyfd == -1)
-		tty[0] = '\0';
-	cp = xmalloc(22 + strlen(tty) + 2 * strlen(pw->pw_name));
-	i = sprintf(cp, "LOGNAME=%s%cNAME=%s%cTTY=%s%c%c", pw->pw_name, 0, 
-	    pw->pw_name, 0, tty, 0, 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));
 	debug3("AIX/UsrInfo: set len %d", i);
+
 	xfree(cp);
 }
 
-#endif /* _AIX */
+# ifdef WITH_AIXAUTHENTICATE
+/*
+ * Remove embedded newlines in string (if any).
+ * Used before logging messages returned by AIX authentication functions
+ * so the message is logged on one line.
+ */
+void
+aix_remove_embedded_newlines(char *p)
+{
+	if (p == NULL)
+		return;
+
+	for (; *p; p++) {
+		if (*p == '\n')
+			*p = ' ';
+	}
+	/* Remove trailing whitespace */
+	if (*--p == ' ')
+		*p = '\0';
+}
+
+/*
+ * 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;
+	static int msg_done = 0;
+	int success = 0;
+
+	aix_setauthdb(user);
+	if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
+		success = 1;
+		if (msg != NULL && loginmsg != NULL && !msg_done) {
+			debug("AIX/loginsuccess: msg %s", msg);
+			buffer_append(loginmsg, msg, strlen(msg));
+			xfree(msg);
+			msg_done = 1;
+		}
+	}
+	aix_restoreauthdb();
+	return (success);
+}
+
+#  ifdef CUSTOM_FAILED_LOGIN
+/*
+ * record_failed_login: generic "login failed" interface function
+ */
+void
+record_failed_login(const char *user, const char *hostname, const char *ttyname)
+{
+	if (geteuid() != 0)
+		return;
+
+	aix_setauthdb(user);
+#   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 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
+	char *registry;
+
+	if (setuserdb(S_READ) == -1) {
+		debug3("%s: Could not open userdb to read", __func__);
+		return;
+	}
+	
+	if (getuserattr((char *)user, S_REGISTRY, &registry, SEC_CHAR) == 0) {
+		if (setauthdb(registry, old_registry) == 0)
+			debug3("AIX/setauthdb set registry '%s'", registry);
+		else 
+			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 /* HAVE_SETAUTHDB */
+}
+
+/*
+ * 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 */
+
+#endif /* _AIX */