diff options
Diffstat (limited to 'crypto/openssh/auth-krb4.c')
| -rw-r--r-- | crypto/openssh/auth-krb4.c | 372 |
1 files changed, 0 insertions, 372 deletions
diff --git a/crypto/openssh/auth-krb4.c b/crypto/openssh/auth-krb4.c deleted file mode 100644 index 799cf261a70e..000000000000 --- a/crypto/openssh/auth-krb4.c +++ /dev/null @@ -1,372 +0,0 @@ -/* - * Copyright (c) 1999 Dug Song. 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 "packet.h" -#include "xmalloc.h" -#include "ssh.h" -#include "servconf.h" - -RCSID("$OpenBSD: auth-krb4.c,v 1.18 2000/09/07 20:27:49 deraadt Exp $"); - -#ifdef KRB4 -char *ticket = NULL; - -extern ServerOptions options; - -/* - * try krb4 authentication, - * return 1 on success, 0 on failure, -1 if krb4 is not available - */ - -int -auth_krb4_password(struct passwd * pw, const char *password) -{ - AUTH_DAT adata; - KTEXT_ST tkt; - struct hostent *hp; - unsigned long faddr; - char localhost[MAXHOSTNAMELEN]; - char phost[INST_SZ]; - char realm[REALM_SZ]; - int r; - - /* - * Try Kerberos password authentication only for non-root - * users and only if Kerberos is installed. - */ - if (pw->pw_uid != 0 && krb_get_lrealm(realm, 1) == KSUCCESS) { - - /* Set up our ticket file. */ - if (!krb4_init(pw->pw_uid)) { - log("Couldn't initialize Kerberos ticket file for %s!", - pw->pw_name); - goto kerberos_auth_failure; - } - /* Try to get TGT using our password. */ - r = krb_get_pw_in_tkt((char *) pw->pw_name, "", - realm, "krbtgt", realm, - DEFAULT_TKT_LIFE, (char *) password); - if (r != INTK_OK) { - packet_send_debug("Kerberos V4 password " - "authentication for %s failed: %s", - pw->pw_name, krb_err_txt[r]); - goto kerberos_auth_failure; - } - /* Successful authentication. */ - chown(tkt_string(), pw->pw_uid, pw->pw_gid); - - /* - * Now that we have a TGT, try to get a local - * "rcmd" ticket to ensure that we are not talking - * to a bogus Kerberos server. - */ - (void) gethostname(localhost, sizeof(localhost)); - (void) strlcpy(phost, (char *) krb_get_phost(localhost), - INST_SZ); - r = krb_mk_req(&tkt, KRB4_SERVICE_NAME, phost, realm, 33); - - if (r == KSUCCESS) { - if (!(hp = gethostbyname(localhost))) { - log("Couldn't get local host address!"); - goto kerberos_auth_failure; - } - memmove((void *) &faddr, (void *) hp->h_addr, - sizeof(faddr)); - - /* Verify our "rcmd" ticket. */ - r = krb_rd_req(&tkt, KRB4_SERVICE_NAME, phost, - faddr, &adata, ""); - if (r == RD_AP_UNDEC) { - /* - * Probably didn't have a srvtab on - * localhost. Disallow login. - */ - log("Kerberos V4 TGT for %s unverifiable, " - "no srvtab installed? krb_rd_req: %s", - pw->pw_name, krb_err_txt[r]); - goto kerberos_auth_failure; - } else if (r != KSUCCESS) { - log("Kerberos V4 %s ticket unverifiable: %s", - KRB4_SERVICE_NAME, krb_err_txt[r]); - goto kerberos_auth_failure; - } - } else if (r == KDC_PR_UNKNOWN) { - /* - * Disallow login if no rcmd service exists, and - * log the error. - */ - log("Kerberos V4 TGT for %s unverifiable: %s; %s.%s " - "not registered, or srvtab is wrong?", pw->pw_name, - krb_err_txt[r], KRB4_SERVICE_NAME, phost); - goto kerberos_auth_failure; - } else { - /* - * TGT is bad, forget it. Possibly spoofed! - */ - packet_send_debug("WARNING: Kerberos V4 TGT " - "possibly spoofed for %s: %s", - pw->pw_name, krb_err_txt[r]); - goto kerberos_auth_failure; - } - - /* Authentication succeeded. */ - return 1; - -kerberos_auth_failure: - krb4_cleanup_proc(NULL); - - if (!options.kerberos_or_local_passwd) - return 0; - } else { - /* Logging in as root or no local Kerberos realm. */ - packet_send_debug("Unable to authenticate to Kerberos."); - } - /* Fall back to ordinary passwd authentication. */ - return -1; -} - -void -krb4_cleanup_proc(void *ignore) -{ - debug("krb4_cleanup_proc called"); - if (ticket) { - (void) dest_tkt(); - xfree(ticket); - ticket = NULL; - } -} - -int -krb4_init(uid_t uid) -{ - static int cleanup_registered = 0; - const char *tkt_root = TKT_ROOT; - struct stat st; - int fd; - - if (!ticket) { - /* Set unique ticket string manually since we're still root. */ - ticket = xmalloc(MAXPATHLEN); -#ifdef AFS - if (lstat("/ticket", &st) != -1) - tkt_root = "/ticket/"; -#endif /* AFS */ - snprintf(ticket, MAXPATHLEN, "%s%u_%d", tkt_root, uid, getpid()); - (void) krb_set_tkt_string(ticket); - } - /* Register ticket cleanup in case of fatal error. */ - if (!cleanup_registered) { - fatal_add_cleanup(krb4_cleanup_proc, NULL); - cleanup_registered = 1; - } - /* Try to create our ticket file. */ - if ((fd = mkstemp(ticket)) != -1) { - close(fd); - return 1; - } - /* Ticket file exists - make sure user owns it (just passed ticket). */ - if (lstat(ticket, &st) != -1) { - if (st.st_mode == (S_IFREG | S_IRUSR | S_IWUSR) && - st.st_uid == uid) - return 1; - } - /* Failure - cancel cleanup function, leaving bad ticket for inspection. */ - log("WARNING: bad ticket file %s", ticket); - fatal_remove_cleanup(krb4_cleanup_proc, NULL); - cleanup_registered = 0; - xfree(ticket); - ticket = NULL; - - return 0; -} - -int -auth_krb4(const char *server_user, KTEXT auth, char **client) -{ - AUTH_DAT adat = {0}; - KTEXT_ST reply; - char instance[INST_SZ]; - int r, s; - socklen_t slen; - u_int cksum; - Key_schedule schedule; - struct sockaddr_in local, foreign; - - s = packet_get_connection_in(); - - slen = sizeof(local); - memset(&local, 0, sizeof(local)); - if (getsockname(s, (struct sockaddr *) & local, &slen) < 0) - debug("getsockname failed: %.100s", strerror(errno)); - slen = sizeof(foreign); - memset(&foreign, 0, sizeof(foreign)); - if (getpeername(s, (struct sockaddr *) & foreign, &slen) < 0) { - debug("getpeername failed: %.100s", strerror(errno)); - fatal_cleanup(); - } - instance[0] = '*'; - instance[1] = 0; - - /* Get the encrypted request, challenge, and session key. */ - if ((r = krb_rd_req(auth, KRB4_SERVICE_NAME, instance, 0, &adat, ""))) { - packet_send_debug("Kerberos V4 krb_rd_req: %.100s", krb_err_txt[r]); - return 0; - } - des_key_sched((des_cblock *) adat.session, schedule); - - *client = xmalloc(MAX_K_NAME_SZ); - (void) snprintf(*client, MAX_K_NAME_SZ, "%s%s%s@%s", adat.pname, - *adat.pinst ? "." : "", adat.pinst, adat.prealm); - - /* Check ~/.klogin authorization now. */ - if (kuserok(&adat, (char *) server_user) != KSUCCESS) { - packet_send_debug("Kerberos V4 .klogin authorization failed!"); - log("Kerberos V4 .klogin authorization failed for %s to account %s", - *client, server_user); - xfree(*client); - return 0; - } - /* Increment the checksum, and return it encrypted with the - session key. */ - cksum = adat.checksum + 1; - cksum = htonl(cksum); - - /* If we can't successfully encrypt the checksum, we send back an - empty message, admitting our failure. */ - if ((r = krb_mk_priv((u_char *) & cksum, reply.dat, sizeof(cksum) + 1, - schedule, &adat.session, &local, &foreign)) < 0) { - packet_send_debug("Kerberos V4 mk_priv: (%d) %s", r, krb_err_txt[r]); - reply.dat[0] = 0; - reply.length = 0; - } else - reply.length = r; - - /* Clear session key. */ - memset(&adat.session, 0, sizeof(&adat.session)); - - packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE); - packet_put_string((char *) reply.dat, reply.length); - packet_send(); - packet_write_wait(); - return 1; -} -#endif /* KRB4 */ - -#ifdef AFS -int -auth_kerberos_tgt(struct passwd *pw, const char *string) -{ - CREDENTIALS creds; - - if (!radix_to_creds(string, &creds)) { - log("Protocol error decoding Kerberos V4 tgt"); - packet_send_debug("Protocol error decoding Kerberos V4 tgt"); - goto auth_kerberos_tgt_failure; - } - if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */ - strlcpy(creds.service, "krbtgt", sizeof creds.service); - - if (strcmp(creds.service, "krbtgt")) { - log("Kerberos V4 tgt (%s%s%s@%s) rejected for %s", creds.pname, - creds.pinst[0] ? "." : "", creds.pinst, creds.realm, - pw->pw_name); - packet_send_debug("Kerberos V4 tgt (%s%s%s@%s) rejected for %s", - creds.pname, creds.pinst[0] ? "." : "", creds.pinst, - creds.realm, pw->pw_name); - goto auth_kerberos_tgt_failure; - } - if (!krb4_init(pw->pw_uid)) - goto auth_kerberos_tgt_failure; - - if (in_tkt(creds.pname, creds.pinst) != KSUCCESS) - goto auth_kerberos_tgt_failure; - - if (save_credentials(creds.service, creds.instance, creds.realm, - creds.session, creds.lifetime, creds.kvno, - &creds.ticket_st, creds.issue_date) != KSUCCESS) { - packet_send_debug("Kerberos V4 tgt refused: couldn't save credentials"); - goto auth_kerberos_tgt_failure; - } - /* Successful authentication, passed all checks. */ - chown(tkt_string(), pw->pw_uid, pw->pw_gid); - - packet_send_debug("Kerberos V4 tgt accepted (%s.%s@%s, %s%s%s@%s)", - creds.service, creds.instance, creds.realm, creds.pname, - creds.pinst[0] ? "." : "", creds.pinst, creds.realm); - memset(&creds, 0, sizeof(creds)); - packet_start(SSH_SMSG_SUCCESS); - packet_send(); - packet_write_wait(); - return 1; - -auth_kerberos_tgt_failure: - krb4_cleanup_proc(NULL); - memset(&creds, 0, sizeof(creds)); - packet_start(SSH_SMSG_FAILURE); - packet_send(); - packet_write_wait(); - return 0; -} - -int -auth_afs_token(struct passwd *pw, const char *token_string) -{ - CREDENTIALS creds; - uid_t uid = pw->pw_uid; - - if (!radix_to_creds(token_string, &creds)) { - log("Protocol error decoding AFS token"); - packet_send_debug("Protocol error decoding AFS token"); - packet_start(SSH_SMSG_FAILURE); - packet_send(); - packet_write_wait(); - return 0; - } - if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */ - strlcpy(creds.service, "afs", sizeof creds.service); - - if (strncmp(creds.pname, "AFS ID ", 7) == 0) - uid = atoi(creds.pname + 7); - - if (kafs_settoken(creds.realm, uid, &creds)) { - log("AFS token (%s@%s) rejected for %s", creds.pname, creds.realm, - pw->pw_name); - packet_send_debug("AFS token (%s@%s) rejected for %s", creds.pname, - creds.realm, pw->pw_name); - memset(&creds, 0, sizeof(creds)); - packet_start(SSH_SMSG_FAILURE); - packet_send(); - packet_write_wait(); - return 0; - } - packet_send_debug("AFS token accepted (%s@%s, %s@%s)", creds.service, - creds.realm, creds.pname, creds.realm); - memset(&creds, 0, sizeof(creds)); - packet_start(SSH_SMSG_SUCCESS); - packet_send(); - packet_write_wait(); - return 1; -} -#endif /* AFS */ |