X-Git-Url: http://andersk.mit.edu/gitweb/gssapi-openssh.git/blobdiff_plain/58b60d163a3c1a5735240ec1697d437b7aaf524a..5107d8f0aec2362143029410cc3c812409924b21:/openssh/openbsd-compat/port-aix.c diff --git a/openssh/openbsd-compat/port-aix.c b/openssh/openbsd-compat/port-aix.c index 9fbcce9..0723e98 100644 --- a/openssh/openbsd-compat/port-aix.c +++ b/openssh/openbsd-compat/port-aix.c @@ -1,6 +1,7 @@ /* * * 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 @@ -24,21 +25,45 @@ * */ #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 +#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) +# undef T_NULL +# include +# endif +# include +#endif + #include "port-aix.h" -extern ServerOptions options; +# 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 @@ -54,7 +79,7 @@ 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)); @@ -63,7 +88,7 @@ aix_usrinfo(struct passwd *pw) xfree(cp); } -#ifdef WITH_AIXAUTHENTICATE +# ifdef WITH_AIXAUTHENTICATE /* * Remove embedded newlines in string (if any). * Used before logging messages returned by AIX authentication functions @@ -83,41 +108,224 @@ aix_remove_embedded_newlines(char *p) 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; + 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 *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__); @@ -125,18 +333,66 @@ aix_setauthdb(const char *user) } 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 */ + +#endif /* _AIX */