X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/6d05637a6aab1be3469d3ef1a1f2753e4dc6a173..cc365543c473fc49be6e02687ce43d16ef918e67:/openbsd-compat/port-aix.c diff --git a/openbsd-compat/port-aix.c b/openbsd-compat/port-aix.c index 5ba6819d..0bdefbf6 100644 --- a/openbsd-compat/port-aix.c +++ b/openbsd-compat/port-aix.c @@ -1,6 +1,7 @@ /* * * 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 @@ -24,28 +25,46 @@ * */ #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" -#include "buffer.h" #ifdef _AIX +#include +#if defined(HAVE_NETDB_H) +# include +#endif #include +#include +#include +#include +#include + +#ifdef WITH_AIXAUTHENTICATE +# include +# include +# if defined(HAVE_SYS_AUDIT_H) && defined(AIX_LOGINFAILED_4ARG) +# include +# endif +# include +#endif + #include "port-aix.h" -extern ServerOptions options; -extern Buffer loginmsg; +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 @@ -61,7 +80,7 @@ aix_usrinfo(struct passwd *pw) 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)); @@ -91,6 +110,59 @@ aix_remove_embedded_newlines(char *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. @@ -101,41 +173,35 @@ aix_remove_embedded_newlines(char *p) int sys_auth_passwd(Authctxt *ctxt, const char *password) { - char *authmsg = NULL, *host, *msg, *name = ctxt->pw->pw_name; + 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, msg %.100s", result, + debug3("AIX/authenticate result %d, authmsg %.100s", result, authmsg); } while (reenter); + if (!aix_valid_authentications(name)) + result = -1; + if (result == 0) { authsuccess = 1; - host = (char *)get_canonical_hostname(options.use_dns); - - /* + /* * Record successful login. We don't have a pty yet, so just * label the line as "ssh" */ aix_setauthdb(name); - if (loginsuccess((char *)name, (char *)host, "ssh", &msg) == 0) { - if (msg != NULL) { - debug("%s: msg %s", __func__, msg); - buffer_append(&loginmsg, msg, strlen(msg)); - xfree(msg); - } - } /* * Check if the user's password is expired. */ expired = passwdexpired(name, &msg); if (msg && *msg) { - buffer_append(&loginmsg, msg, strlen(msg)); + buffer_append(ctxt->loginmsg, msg, strlen(msg)); aix_remove_embedded_newlines(msg); } debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg); @@ -145,7 +211,6 @@ sys_auth_passwd(Authctxt *ctxt, const char *password) break; case 1: /* expired, password change required */ ctxt->force_pwchange = 1; - disable_forwarding(); break; default: /* user can't change(2) or other error (-1) */ logit("Password can't be changed for user %s: %.100s", @@ -163,24 +228,96 @@ sys_auth_passwd(Authctxt *ctxt, const char *password) 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 = (char *)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); + loginfailed((char *)user, (char *)hostname, (char *)ttyname, + AUDIT_FAIL_AUTH); # else - loginfailed((char *)user, hostname, (char *)ttyname); + loginfailed((char *)user, (char *)hostname, (char *)ttyname); # endif aix_restoreauthdb(); } @@ -237,4 +374,101 @@ aix_restoreauthdb(void) # 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 +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 */