| /* |
| * |
| * 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 |
| * 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 "sshbuf.h" |
| #include "ssherr.h" |
| #include "sshkey.h" |
| #include "hostfile.h" |
| #include "auth.h" |
| #include "ssh.h" |
| #include "ssh_api.h" |
| #include "log.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) |
| # include <sys/audit.h> |
| # endif |
| # include <usersec.h> |
| #endif |
| |
| #include "port-aix.h" |
| |
| 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 - |
| * 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) |
| { |
| u_int i; |
| size_t len; |
| char *cp; |
| |
| 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', |
| 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); |
| |
| free(cp); |
| } |
| |
| # 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(struct ssh *ssh, const char *password) |
| { |
| Authctxt *ctxt = ssh->authctxt; |
| char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name; |
| int r, 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) { |
| if ((r = sshbuf_put(ctxt->loginmsg, |
| msg, strlen(msg))) != 0) |
| fatal("%s: buffer error: %s", |
| __func__, ssh_err(r)); |
| 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); |
| free(msg); |
| authsuccess = 0; |
| } |
| |
| aix_restoreauthdb(); |
| } |
| |
| free(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, struct sshbuf *loginmsg) |
| { |
| char *msg = NULL; |
| int r, 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) { |
| if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| } |
| 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); |
| free(msg); |
| return permitted; |
| } |
| |
| int |
| sys_auth_record_login(const char *user, const char *host, const char *ttynm, |
| struct sshbuf *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(struct ssh *ssh, 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, ®istry, 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 */ |
| |
| # ifdef USE_AIX_KRB_NAME |
| /* |
| * aix_krb5_get_principal_name: returns the user's kerberos client principal name if |
| * configured, otherwise NULL. Caller must free returned string. |
| */ |
| char * |
| aix_krb5_get_principal_name(char *pw_name) |
| { |
| char *authname = NULL, *authdomain = NULL, *principal = NULL; |
| |
| setuserdb(S_READ); |
| if (getuserattr(pw_name, S_AUTHDOMAIN, &authdomain, SEC_CHAR) != 0) |
| debug("AIX getuserattr S_AUTHDOMAIN: %s", strerror(errno)); |
| if (getuserattr(pw_name, S_AUTHNAME, &authname, SEC_CHAR) != 0) |
| debug("AIX getuserattr S_AUTHNAME: %s", strerror(errno)); |
| |
| if (authdomain != NULL) |
| xasprintf(&principal, "%s@%s", authname ? authname : pw_name, authdomain); |
| else if (authname != NULL) |
| principal = xstrdup(authname); |
| enduserdb(); |
| return principal; |
| } |
| # endif /* USE_AIX_KRB_NAME */ |
| |
| # 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 */ |