From f4376f4d0b68a4fd8285ad5aa44bee148f646491 Mon Sep 17 00:00:00 2001 From: Jeffrey Altman Date: Fri, 24 Mar 2000 22:02:59 +0000 Subject: [PATCH] jaltman@columbia.edu Mar 24, 2000: In 1.0.6, the code was altered to provide a fallback mechanism to try the "master" kdc's in case the normal kdc's did not have the most up to date password information. The original implementation had significant conflicts with the use of DNS SRV records. In addition, it often performed a lot of unneeded work. The new code still performs a fallback to the "master" kdc but only does the computation of the "master kdc list" if we are in fact going to attempt to use a master. For DNS SRV we introduce a new _kerberos-master.. record to list the master kdc's and the priorities to be used when contacting a master. This allows for a multi-tiered implementation. --- The other change is local to krb/get_in_tkt.c. In preparation for adding public krb5_appdefault_boolean and krb5_appdefault_string functions, the static functions by that name in get_in_tkt.c are renamed to krb5_libdefault_xxxxx since they currently access the [libdefault] section of the code. git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@12137 dc483132-0cff-0310-8789-dd5450dbe970 --- src/lib/krb5/krb/get_in_tkt.c | 28 +++---- src/lib/krb5/krb/gic_keytab.c | 12 +-- src/lib/krb5/krb/gic_pwd.c | 16 ++-- src/lib/krb5/os/changepw.c | 23 ++---- src/lib/krb5/os/locate_kdc.c | 151 ++++++++++++---------------------- src/lib/krb5/os/os-proto.h | 3 +- src/lib/krb5/os/sendto_kdc.c | 27 ++---- src/lib/krb5/os/t_std_conf.c | 4 +- 8 files changed, 93 insertions(+), 171 deletions(-) diff --git a/src/lib/krb5/krb/get_in_tkt.c b/src/lib/krb5/krb/get_in_tkt.c index c1c6df160..9686f578a 100644 --- a/src/lib/krb5/krb/get_in_tkt.c +++ b/src/lib/krb5/krb/get_in_tkt.c @@ -84,13 +84,13 @@ static krb5_error_code make_preauth_list PROTOTYPE((krb5_context, */ static krb5_error_code send_as_request(context, request, time_now, ret_err_reply, ret_as_reply, - master) + use_master) krb5_context context; krb5_kdc_req *request; krb5_timestamp *time_now; krb5_error ** ret_err_reply; krb5_kdc_rep ** ret_as_reply; - int * master; + int use_master; { krb5_kdc_rep *as_reply = 0; krb5_error_code retval; @@ -116,7 +116,7 @@ send_as_request(context, request, time_now, ret_err_reply, ret_as_reply, k4_version = packet->data[0]; retval = krb5_sendto_kdc(context, packet, krb5_princ_realm(context, request->client), - &reply, master); + &reply, use_master); krb5_free_data(context, packet); if (retval) goto cleanup; @@ -559,7 +559,7 @@ cleanup: return (retval); } -/* begin appdefaults parsing code. This should almost certainly move +/* begin libdefaults parsing code. This should almost certainly move somewhere else, but I don't know where the correct somewhere else is yet. */ @@ -595,7 +595,7 @@ _krb5_conf_boolean(s) } static krb5_error_code -krb5_appdefault_string(context, realm, option, ret_value) +krb5_libdefault_string(context, realm, option, ret_value) krb5_context context; const krb5_data *realm; const char *option; @@ -673,7 +673,7 @@ goodbye: /* as well as the DNS code */ krb5_error_code -krb5_appdefault_boolean(context, realm, option, ret_value) +krb5_libdefault_boolean(context, realm, option, ret_value) krb5_context context; const char *option; const krb5_data *realm; @@ -682,7 +682,7 @@ krb5_appdefault_boolean(context, realm, option, ret_value) char *string = NULL; krb5_error_code retval; - retval = krb5_appdefault_string(context, realm, option, &string); + retval = krb5_libdefault_string(context, realm, option, &string); if (retval) return(retval); @@ -696,7 +696,7 @@ krb5_appdefault_boolean(context, realm, option, ret_value) KRB5_DLLIMP krb5_error_code KRB5_CALLCONV krb5_get_init_creds(context, creds, client, prompter, prompter_data, start_time, in_tkt_service, options, gak_fct, gak_data, - master, as_reply) + use_master, as_reply) krb5_context context; krb5_creds *creds; krb5_principal client; @@ -707,7 +707,7 @@ krb5_get_init_creds(context, creds, client, prompter, prompter_data, krb5_get_init_creds_opt *options; krb5_gic_get_as_key_fct gak_fct; void *gak_data; - int *master; + int use_master; krb5_kdc_rep **as_reply; { krb5_error_code ret; @@ -751,7 +751,7 @@ krb5_get_init_creds(context, creds, client, prompter, prompter_data, if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE)) tempint = options->forwardable; - else if ((ret = krb5_appdefault_boolean(context, &client->realm, + else if ((ret = krb5_libdefault_boolean(context, &client->realm, "forwardable", &tempint)) == 0) ; else @@ -763,7 +763,7 @@ krb5_get_init_creds(context, creds, client, prompter, prompter_data, if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE)) tempint = options->proxiable; - else if ((ret = krb5_appdefault_boolean(context, &client->realm, + else if ((ret = krb5_libdefault_boolean(context, &client->realm, "proxiable", &tempint)) == 0) ; else @@ -775,7 +775,7 @@ krb5_get_init_creds(context, creds, client, prompter, prompter_data, if (options && (options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE)) { renew_life = options->renew_life; - } else if ((ret = krb5_appdefault_string(context, &client->realm, + } else if ((ret = krb5_libdefault_string(context, &client->realm, "renew_lifetime", &tempstr)) == 0) { if (ret = krb5_string_to_deltat(tempstr, &renew_life)) { @@ -868,7 +868,7 @@ krb5_get_init_creds(context, creds, client, prompter, prompter_data, } /* it would be nice if this parsed out an address list, but that would be work. */ - else if (((ret = krb5_appdefault_boolean(context, &client->realm, + else if (((ret = krb5_libdefault_boolean(context, &client->realm, "noaddresses", &tempint)) == 0) && tempint) { ; @@ -923,7 +923,7 @@ krb5_get_init_creds(context, creds, client, prompter, prompter_data, err_reply = 0; local_as_reply = 0; if ((ret = send_as_request(context, &request, &time_now, &err_reply, - &local_as_reply, master))) + &local_as_reply, use_master))) goto cleanup; if (err_reply) { diff --git a/src/lib/krb5/krb/gic_keytab.c b/src/lib/krb5/krb/gic_keytab.c index 8b6f23199..ad33fb990 100644 --- a/src/lib/krb5/krb/gic_keytab.c +++ b/src/lib/krb5/krb/gic_keytab.c @@ -61,7 +61,7 @@ krb5_get_init_creds_keytab(context, creds, client, arg_keytab, krb5_get_init_creds_opt *options; { krb5_error_code ret, ret2; - int master; + int use_master; krb5_keytab keytab; if (arg_keytab == NULL) { @@ -71,14 +71,14 @@ krb5_get_init_creds_keytab(context, creds, client, arg_keytab, keytab = arg_keytab; } - master = 0; + use_master = 0; /* first try: get the requested tkt from any kdc */ ret = krb5_get_init_creds(context, creds, client, NULL, NULL, start_time, in_tkt_service, options, krb5_get_as_key_keytab, (void *) keytab, - &master, NULL); + use_master,NULL); /* check for success */ @@ -93,13 +93,13 @@ krb5_get_init_creds_keytab(context, creds, client, arg_keytab, /* if the reply did not come from the master kdc, try again with the master kdc */ - if (!master) { - master = 1; + if (!use_master) { + use_master = 1; ret2 = krb5_get_init_creds(context, creds, client, NULL, NULL, start_time, in_tkt_service, options, krb5_get_as_key_keytab, (void *) keytab, - &master, NULL); + use_master, NULL); if (ret2 == 0) { ret = 0; diff --git a/src/lib/krb5/krb/gic_pwd.c b/src/lib/krb5/krb/gic_pwd.c index 7ca43430e..8debaee02 100644 --- a/src/lib/krb5/krb/gic_pwd.c +++ b/src/lib/krb5/krb/gic_pwd.c @@ -97,7 +97,7 @@ krb5_get_init_creds_password(context, creds, client, password, prompter, data, krb5_get_init_creds_opt *options; { krb5_error_code ret, ret2; - int master; + int use_master; krb5_kdc_rep *as_reply; int tries; krb5_creds chpw_creds; @@ -107,7 +107,7 @@ krb5_get_init_creds_password(context, creds, client, password, prompter, data, krb5_prompt prompt[2]; krb5_prompt_type prompt_types[sizeof(prompt)/sizeof(prompt[0])]; - master = 0; + use_master = 0; as_reply = NULL; memset(&chpw_creds, 0, sizeof(chpw_creds)); @@ -133,7 +133,7 @@ krb5_get_init_creds_password(context, creds, client, password, prompter, data, ret = krb5_get_init_creds(context, creds, client, prompter, data, start_time, in_tkt_service, options, krb5_get_as_key_password, (void *) &pw0, - &master, &as_reply); + use_master, &as_reply); /* check for success */ @@ -150,13 +150,13 @@ krb5_get_init_creds_password(context, creds, client, password, prompter, data, /* if the reply did not come from the master kdc, try again with the master kdc */ - if (!master) { - master = 1; + if (!use_master) { + use_master = 1; ret2 = krb5_get_init_creds(context, creds, client, prompter, data, start_time, in_tkt_service, options, krb5_get_as_key_password, (void *) &pw0, - &master, &as_reply); + use_master, &as_reply); if (ret2 == 0) { ret = 0; @@ -195,7 +195,7 @@ krb5_get_init_creds_password(context, creds, client, password, prompter, data, prompter, data, start_time, "kadmin/changepw", &chpw_opts, krb5_get_as_key_password, (void *) &pw0, - &master, NULL))) + use_master, NULL))) goto cleanup; prompt[0].prompt = "Enter new password"; @@ -282,7 +282,7 @@ krb5_get_init_creds_password(context, creds, client, password, prompter, data, ret = krb5_get_init_creds(context, creds, client, prompter, data, start_time, in_tkt_service, options, krb5_get_as_key_password, (void *) &pw0, - &master, &as_reply); + use_master, &as_reply); cleanup: krb5int_set_prompt_types(context, 0); diff --git a/src/lib/krb5/os/changepw.c b/src/lib/krb5/os/changepw.c index 6ed95bce7..597351619 100644 --- a/src/lib/krb5/os/changepw.c +++ b/src/lib/krb5/os/changepw.c @@ -53,31 +53,24 @@ */ static krb5_error_code -krb5_locate_kpasswd(context, realm, addr_pp, naddrs, master_index, nmasters) +krb5_locate_kpasswd(context, realm, addr_pp, naddrs) krb5_context context; const krb5_data *realm; struct sockaddr **addr_pp; int *naddrs; - int *master_index; - int *nmasters; { krb5_error_code code; int i; -#ifdef KRB5_DNS_LOOKUP - struct sockaddr *admin_addr_p, *kdc_addr_p; - int nadmin_addrs, nkdc_addrs; - int j; -#endif /* KRB5_DNS_LOOKUP */ /* * We always try the local file first */ - code = krb5_locate_srv_conf(context, realm, "kpasswd_server", addr_pp, naddrs, - master_index, nmasters); + code = krb5_locate_srv_conf( context, realm, "kpasswd_server", + addr_pp, naddrs, 0); if (code) { - code = krb5_locate_srv_conf(context, realm, "admin_server", addr_pp, naddrs, - master_index, nmasters); + code = krb5_locate_srv_conf( context, realm, "admin_server", + addr_pp, naddrs, 0); if ( !code ) { /* success with admin_server but now we need to change the port */ /* number to use DEFAULT_KPASSWD_PORT. */ @@ -108,10 +101,6 @@ krb5_locate_kpasswd(context, realm, addr_pp, naddrs, master_index, nmasters) } } } - if ( !code && master_index && nmasters ) { - *master_index = 1; - *nmasters = *naddrs; - } } } #endif /* KRB5_DNS_LOOKUP */ @@ -158,7 +147,7 @@ krb5_change_password(context, creds, newpw, result_code, if (code = krb5_locate_kpasswd(context, krb5_princ_realm(context, creds->client), - &addr_p, &naddr_p,NULL,NULL)) + &addr_p, &naddr_p)) goto cleanup; /* this is really obscure. s1 is used for all communications. it diff --git a/src/lib/krb5/os/locate_kdc.c b/src/lib/krb5/os/locate_kdc.c index fcdfa03f2..1139fb338 100644 --- a/src/lib/krb5/os/locate_kdc.c +++ b/src/lib/krb5/os/locate_kdc.c @@ -85,14 +85,13 @@ _krb5_use_dns(context) */ krb5_error_code -krb5_locate_srv_conf(context, realm, name, addr_pp, naddrs, master_index, nmasters) +krb5_locate_srv_conf(context, realm, name, addr_pp, naddrs, get_masters) krb5_context context; const krb5_data *realm; const char * name; struct sockaddr **addr_pp; int *naddrs; - int *master_index; - int *nmasters; + int get_masters; { const char *realm_srv_names[4]; char **masterlist, **hostlist, *host, *port, *cp; @@ -162,10 +161,7 @@ krb5_locate_srv_conf(context, realm, name, addr_pp, naddrs, master_index, nmaste return 0; } - if (master_index) { - *master_index = 0; - *nmasters = 0; - + if (get_masters) { realm_srv_names[0] = "realms"; realm_srv_names[1] = host; realm_srv_names[2] = "admin_server"; @@ -209,8 +205,10 @@ krb5_locate_srv_conf(context, realm, name, addr_pp, naddrs, master_index, nmaste addr_p = (struct sockaddr *)malloc (sizeof (struct sockaddr) * count); if (addr_p == NULL) { - profile_free_list(hostlist); - profile_free_list(masterlist); + if ( hostlist ) + profile_free_list(hostlist); + if ( masterlist ) + profile_free_list(masterlist); return ENOMEM; } @@ -239,52 +237,54 @@ krb5_locate_srv_conf(context, realm, name, addr_pp, naddrs, master_index, nmaste if (masterlist) { for (j=0; masterlist[j]; j++) { if (strcasecmp(hostlist[i], masterlist[j]) == 0) { - *master_index = out; ismaster = 1; } } } - switch (hp->h_addrtype) { - + if ( !get_masters || ismaster ) { + switch (hp->h_addrtype) { #ifdef HAVE_NETINET_IN_H - case AF_INET: - for (j=0; hp->h_addr_list[j]; j++) { - sin_p = (struct sockaddr_in *) &addr_p[out++]; - memset ((char *)sin_p, 0, sizeof(struct sockaddr)); - sin_p->sin_family = hp->h_addrtype; - sin_p->sin_port = port ? htons(atoi(port)) : udpport; - memcpy((char *)&sin_p->sin_addr, - (char *)hp->h_addr_list[j], - sizeof(struct in_addr)); - if (out+1 >= count) { - count += 5; - addr_p = (struct sockaddr *) - realloc ((char *)addr_p, - sizeof(struct sockaddr) * count); - if (addr_p == NULL) { - profile_free_list(hostlist); - profile_free_list(masterlist); - return ENOMEM; + case AF_INET: + for (j=0; hp->h_addr_list[j]; j++) { + sin_p = (struct sockaddr_in *) &addr_p[out++]; + memset ((char *)sin_p, 0, sizeof(struct sockaddr)); + sin_p->sin_family = hp->h_addrtype; + sin_p->sin_port = port ? htons(atoi(port)) : udpport; + memcpy((char *)&sin_p->sin_addr, + (char *)hp->h_addr_list[j], + sizeof(struct in_addr)); + if (out+1 >= count) { + count += 5; + addr_p = (struct sockaddr *) + realloc ((char *)addr_p, + sizeof(struct sockaddr) * count); + if (addr_p == NULL) { + if ( hostlist ) + profile_free_list(hostlist); + if ( masterlist ) + profile_free_list(masterlist); + return ENOMEM; + } } - } - if (sec_udpport && !port) { - addr_p[out] = addr_p[out-1]; - sin_p = (struct sockaddr_in *) &addr_p[out++]; - sin_p->sin_port = sec_udpport; - } - } - break; + if (sec_udpport && !port) { + addr_p[out] = addr_p[out-1]; + sin_p = (struct sockaddr_in *) &addr_p[out++]; + sin_p->sin_port = sec_udpport; + } + } + break; #endif - default: - break; - } - if (ismaster) - *nmasters = out - *master_index; + default: + break; + } + } } - profile_free_list(hostlist); - profile_free_list(masterlist); + if ( hostlist ) + profile_free_list(hostlist); + if ( masterlist ) + profile_free_list(masterlist); if (out == 0) { /* Couldn't resolve any KDC names */ free (addr_p); @@ -564,78 +564,29 @@ krb5_locate_srv_dns(realm, service, protocol, addr_pp, naddrs) */ krb5_error_code -krb5_locate_kdc(context, realm, addr_pp, naddrs, master_index, nmasters) +krb5_locate_kdc(context, realm, addr_pp, naddrs, get_masters) krb5_context context; const krb5_data *realm; struct sockaddr **addr_pp; int *naddrs; - int *master_index; - int *nmasters; + int get_masters; { krb5_error_code code; -#ifdef KRB5_DNS_LOOKUP - struct sockaddr *admin_addr_p, *kdc_addr_p; - int nadmin_addrs, nkdc_addrs; - int i,j; -#endif /* KRB5_DNS_LOOKUP */ /* * We always try the local file first */ code = krb5_locate_srv_conf(context, realm, "kdc", addr_pp, naddrs, - master_index, nmasters); + get_masters); #ifdef KRB5_DNS_LOOKUP if (code) { int use_dns = _krb5_use_dns(context); if ( use_dns ) { - code = krb5_locate_srv_dns(realm, "_kerberos", "_udp", - addr_pp, naddrs); - if ( master_index && nmasters ) { - - code = krb5_locate_srv_dns(realm, "_kerberos-adm", "_tcp", - &admin_addr_p, &nadmin_addrs); - if ( code ) { - free(*addr_pp); - *addr_pp = NULL; - *naddrs = 0; - return(code); - } - - kdc_addr_p = *addr_pp; - nkdc_addrs = *naddrs; - - *naddrs = 0; - *addr_pp = (struct sockaddr *) malloc(sizeof(*kdc_addr_p)); - if ( *addr_pp == NULL ) { - free(kdc_addr_p); - free(admin_addr_p); - return ENOMEM; - } - - for ( i=0; i= (master_index+nmasters)))) - continue; - /* send to the host, wait timeout seconds for a response, then move on. */ /* cache some sockets for each host */ @@ -210,13 +200,6 @@ krb5_sendto_kdc (context, message, realm, reply, master) reply->length = cc; retval = 0; - - /* if the caller asked to be informed if it - got a master kdc, tell it */ - if (master) - *master = ((host >= master_index) && - (host < (master_index+nmasters))); - goto out; } else if (nready == 0) { /* timeout */ diff --git a/src/lib/krb5/os/t_std_conf.c b/src/lib/krb5/os/t_std_conf.c index 0846b1c22..a95c67ad5 100644 --- a/src/lib/krb5/os/t_std_conf.c +++ b/src/lib/krb5/os/t_std_conf.c @@ -110,14 +110,14 @@ void test_locate_kdc(ctx, realm) struct sockaddr *addrs; struct sockaddr_in *sin; int i, naddrs; - int master_index, nmasters; + int get_masters=0; krb5_data rlm; krb5_error_code retval; rlm.data = realm; rlm.length = strlen(realm); retval = krb5_locate_kdc(ctx, &rlm, &addrs, &naddrs, - &master_index, &nmasters); + get_masters); if (retval) { com_err("krb5_get_krbhst", retval, 0); return; -- 2.26.2