diff options
Diffstat (limited to 'source4/heimdal/lib/krb5/init_creds_pw.c')
| -rw-r--r-- | source4/heimdal/lib/krb5/init_creds_pw.c | 1184 |
1 files changed, 770 insertions, 414 deletions
diff --git a/source4/heimdal/lib/krb5/init_creds_pw.c b/source4/heimdal/lib/krb5/init_creds_pw.c index 0b75522e9d..0435ab5d3b 100644 --- a/source4/heimdal/lib/krb5/init_creds_pw.c +++ b/source4/heimdal/lib/krb5/init_creds_pw.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 1997 - 2007 Kungliga Tekniska Högskolan + * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * @@ -33,15 +33,13 @@ #include "krb5_locl.h" -RCSID("$Id$"); - typedef struct krb5_get_init_creds_ctx { KDCOptions flags; krb5_creds cred; krb5_addresses *addrs; krb5_enctype *etypes; krb5_preauthtype *pre_auth_types; - const char *in_tkt_service; + char *in_tkt_service; unsigned nonce; unsigned pk_nonce; @@ -49,13 +47,26 @@ typedef struct krb5_get_init_creds_ctx { AS_REQ as_req; int pa_counter; - const char *password; - krb5_s2k_proc key_proc; + /* password and keytab_data is freed on completion */ + char *password; + krb5_keytab_key_proc_args *keytab_data; + + krb5_pointer *keyseed; + krb5_s2k_proc keyproc; krb5_get_init_creds_tristate req_pac; krb5_pk_init_ctx pk_init_ctx; int ic_flags; + + METHOD_DATA md; + KRB_ERROR error; + AS_REP as_rep; + EncKDCRepPart enc_part; + + krb5_prompter_fct prompter; + void *prompter_data; + } krb5_get_init_creds_ctx; static krb5_error_code @@ -74,7 +85,7 @@ default_s2k_func(krb5_context context, krb5_enctype type, opaque = *s2kparms; else krb5_data_zero(&opaque); - + *key = malloc(sizeof(**key)); if (*key == NULL) return ENOMEM; @@ -88,14 +99,24 @@ default_s2k_func(krb5_context context, krb5_enctype type, } static void -free_init_creds_ctx(krb5_context context, krb5_get_init_creds_ctx *ctx) +free_init_creds_ctx(krb5_context context, krb5_init_creds_context ctx) { if (ctx->etypes) free(ctx->etypes); if (ctx->pre_auth_types) free (ctx->pre_auth_types); + if (ctx->in_tkt_service) + free(ctx->in_tkt_service); + if (ctx->keytab_data) + free(ctx->keytab_data); + krb5_data_free(&ctx->req_buffer); + krb5_free_cred_contents(context, &ctx->cred); + free_METHOD_DATA(&ctx->md); + free_AS_REP(&ctx->as_rep); + free_EncKDCRepPart(&ctx->enc_part); + free_KRB_ERROR(&ctx->error); free_AS_REQ(&ctx->as_req); - memset(&ctx->as_req, 0, sizeof(ctx->as_req)); + memset(ctx, 0, sizeof(*ctx)); } static int @@ -127,11 +148,9 @@ init_cred (krb5_context context, krb5_creds *cred, krb5_principal client, krb5_deltat start_time, - const char *in_tkt_service, krb5_get_init_creds_opt *options) { krb5_error_code ret; - krb5_const_realm client_realm; int tmp; krb5_timestamp now; @@ -148,8 +167,6 @@ init_cred (krb5_context context, goto out; } - client_realm = krb5_principal_get_realm (context, cred->client); - if (start_time) cred->times.starttime = now + start_time; @@ -164,18 +181,6 @@ init_cred (krb5_context context, cred->times.renew_till = now + options->renew_life; } - if (in_tkt_service) { - ret = krb5_parse_name (context, in_tkt_service, &cred->server); - if (ret) - goto out; - krb5_principal_set_realm (context, cred->server, client_realm); - } else { - ret = krb5_make_principal(context, &cred->server, - client_realm, KRB5_TGS_NAME, client_realm, - NULL); - if (ret) - goto out; - } return 0; out: @@ -195,28 +200,71 @@ report_expiration (krb5_context context, time_t now) { char *p; - + asprintf (&p, "%s%s", str, ctime(&now)); (*prompter) (context, data, NULL, p, 0, NULL); free (p); } /* - * Parse the last_req data and show it to the user if it's interesting + * Check the context, and in the case there is a expiration warning, + * use the prompter to print the warning. + * + * @param context A Kerberos 5 context. + * @param options An GIC options structure + * @param ctx The krb5_init_creds_context check for expiration. */ -static void -print_expire (krb5_context context, - krb5_const_realm realm, - krb5_kdc_rep *rep, - krb5_prompter_fct prompter, - krb5_data *data) +static krb5_error_code +process_last_request(krb5_context context, + krb5_get_init_creds_opt *options, + krb5_init_creds_context ctx) { - int i; - LastReq *lr = &rep->enc_part.last_req; + krb5_const_realm realm; + LastReq *lr; + krb5_boolean reported = FALSE; krb5_timestamp sec; time_t t; - krb5_boolean reported = FALSE; + size_t i; + + /* + * First check if there is a API consumer. + */ + + realm = krb5_principal_get_realm (context, ctx->cred.client); + lr = &ctx->enc_part.last_req; + + if (options && options->opt_private && options->opt_private->lr.func) { + krb5_last_req_entry **lre; + + lre = calloc(lr->len + 1, sizeof(**lre)); + if (lre == NULL) { + krb5_set_error_message(context, ENOMEM, + N_("malloc: out of memory", "")); + return ENOMEM; + } + for (i = 0; i < lr->len; i++) { + lre[i] = calloc(1, sizeof(*lre[i])); + if (lre[i] == NULL) + break; + lre[i]->lr_type = lr->val[i].lr_type; + lre[i]->value = lr->val[i].lr_value; + } + + (*options->opt_private->lr.func)(context, lre, + options->opt_private->lr.ctx); + + for (i = 0; i < lr->len; i++) + free(lre[i]); + free(lre); + } + + /* + * Now check if we should prompt the user + */ + + if (ctx->prompter == NULL) + return 0; krb5_timeofday (context, &sec); @@ -229,13 +277,15 @@ print_expire (krb5_context context, if (lr->val[i].lr_value <= t) { switch (abs(lr->val[i].lr_type)) { case LR_PW_EXPTIME : - report_expiration(context, prompter, data, + report_expiration(context, ctx->prompter, + ctx->prompter_data, "Your password will expire at ", lr->val[i].lr_value); reported = TRUE; break; case LR_ACCT_EXPTIME : - report_expiration(context, prompter, data, + report_expiration(context, ctx->prompter, + ctx->prompter_data, "Your account will expire at ", lr->val[i].lr_value); reported = TRUE; @@ -245,12 +295,14 @@ print_expire (krb5_context context, } if (!reported - && rep->enc_part.key_expiration - && *rep->enc_part.key_expiration <= t) { - report_expiration(context, prompter, data, + && ctx->enc_part.key_expiration + && *ctx->enc_part.key_expiration <= t) { + report_expiration(context, ctx->prompter, + ctx->prompter_data, "Your password/account will expire at ", - *rep->enc_part.key_expiration); + *ctx->enc_part.key_expiration); } + return 0; } static krb5_addresses no_addrs = { 0, NULL }; @@ -259,11 +311,10 @@ static krb5_error_code get_init_creds_common(krb5_context context, krb5_principal client, krb5_deltat start_time, - const char *in_tkt_service, krb5_get_init_creds_opt *options, - krb5_get_init_creds_ctx *ctx) + krb5_init_creds_context ctx) { - krb5_get_init_creds_opt default_opt; + krb5_get_init_creds_opt *default_opt = NULL; krb5_error_code ret; krb5_enctype *etypes; krb5_preauthtype *pre_auth_types; @@ -271,37 +322,51 @@ get_init_creds_common(krb5_context context, memset(ctx, 0, sizeof(*ctx)); if (options == NULL) { - krb5_get_init_creds_opt_init (&default_opt); - options = &default_opt; - } else { - _krb5_get_init_creds_opt_free_krb5_error(options); + const char *realm = krb5_principal_get_realm(context, client); + + krb5_get_init_creds_opt_alloc (context, &default_opt); + options = default_opt; + krb5_get_init_creds_opt_set_default_flags(context, NULL, realm, options); } if (options->opt_private) { - ctx->password = options->opt_private->password; - ctx->key_proc = options->opt_private->key_proc; + if (options->opt_private->password) { + ret = krb5_init_creds_set_password(context, ctx, + options->opt_private->password); + if (ret) + goto out; + } + + ctx->keyproc = options->opt_private->key_proc; ctx->req_pac = options->opt_private->req_pac; ctx->pk_init_ctx = options->opt_private->pk_init_ctx; ctx->ic_flags = options->opt_private->flags; } else ctx->req_pac = KRB5_INIT_CREDS_TRISTATE_UNSET; - if (ctx->key_proc == NULL) - ctx->key_proc = default_s2k_func; + if (ctx->keyproc == NULL) + ctx->keyproc = default_s2k_func; - if (ctx->ic_flags & KRB5_INIT_CREDS_CANONICALIZE) + /* Enterprise name implicitly turns on canonicalize */ + if ((ctx->ic_flags & KRB5_INIT_CREDS_CANONICALIZE) || + krb5_principal_get_type(context, client) == KRB5_NT_ENTERPRISE_PRINCIPAL) ctx->flags.canonicalize = 1; ctx->pre_auth_types = NULL; ctx->addrs = NULL; ctx->etypes = NULL; ctx->pre_auth_types = NULL; - ctx->in_tkt_service = in_tkt_service; - ret = init_cred (context, &ctx->cred, client, start_time, - in_tkt_service, options); - if (ret) + ret = init_cred(context, &ctx->cred, client, start_time, options); + if (ret) { + if (default_opt) + krb5_get_init_creds_opt_free(context, default_opt); return ret; + } + + ret = krb5_init_creds_set_service(context, ctx, NULL); + if (ret) + goto out; if (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE) ctx->flags.forwardable = options->forwardable; @@ -336,8 +401,9 @@ get_init_creds_common(krb5_context context, etypes = malloc((options->etype_list_length + 1) * sizeof(krb5_enctype)); if (etypes == NULL) { - krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); - return ENOMEM; + ret = ENOMEM; + krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); + goto out; } memcpy (etypes, options->etype_list, options->etype_list_length * sizeof(krb5_enctype)); @@ -348,19 +414,24 @@ get_init_creds_common(krb5_context context, pre_auth_types = malloc((options->preauth_list_length + 1) * sizeof(krb5_preauthtype)); if (pre_auth_types == NULL) { - krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); - return ENOMEM; + ret = ENOMEM; + krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); + goto out; } memcpy (pre_auth_types, options->preauth_list, options->preauth_list_length * sizeof(krb5_preauthtype)); pre_auth_types[options->preauth_list_length] = KRB5_PADATA_NONE; ctx->pre_auth_types = pre_auth_types; } - if (options->flags & KRB5_GET_INIT_CREDS_OPT_SALT) - ; /* XXX */ if (options->flags & KRB5_GET_INIT_CREDS_OPT_ANONYMOUS) ctx->flags.request_anonymous = options->anonymous; + if (default_opt) + krb5_get_init_creds_opt_free(context, default_opt); return 0; + out: + if (default_opt) + krb5_get_init_creds_opt_free(context, default_opt); + return ret; } static krb5_error_code @@ -382,18 +453,20 @@ change_password (krb5_context context, krb5_data result_code_string; krb5_data result_string; char *p; - krb5_get_init_creds_opt options; + krb5_get_init_creds_opt *options; memset (&cpw_cred, 0, sizeof(cpw_cred)); - krb5_get_init_creds_opt_init (&options); - krb5_get_init_creds_opt_set_tkt_life (&options, 60); - krb5_get_init_creds_opt_set_forwardable (&options, FALSE); - krb5_get_init_creds_opt_set_proxiable (&options, FALSE); + ret = krb5_get_init_creds_opt_alloc(context, &options); + if (ret) + return ret; + krb5_get_init_creds_opt_set_tkt_life (options, 60); + krb5_get_init_creds_opt_set_forwardable (options, FALSE); + krb5_get_init_creds_opt_set_proxiable (options, FALSE); if (old_options && old_options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST) - krb5_get_init_creds_opt_set_preauth_list (&options, + krb5_get_init_creds_opt_set_preauth_list (options, old_options->preauth_list, - old_options->preauth_list_length); + old_options->preauth_list_length); krb5_data_zero (&result_code_string); krb5_data_zero (&result_string); @@ -406,7 +479,8 @@ change_password (krb5_context context, data, 0, "kadmin/changepw", - &options); + options); + krb5_get_init_creds_opt_free(context, options); if (ret) goto out; @@ -455,7 +529,9 @@ change_password (krb5_context context, (int)result_string.length, result_string.length > 0 ? (char*)result_string.data : ""); - ret = (*prompter) (context, data, NULL, p, 0, NULL); + /* return the result */ + (*prompter) (context, data, NULL, p, 0, NULL); + free (p); if (result_code == 0) { strlcpy (newpw, buf1, newpw_sz); @@ -475,6 +551,7 @@ out: return ret; } + krb5_error_code KRB5_LIB_FUNCTION krb5_keyblock_key_proc (krb5_context context, krb5_keytype type, @@ -485,68 +562,17 @@ krb5_keyblock_key_proc (krb5_context context, return krb5_copy_keyblock (context, keyseed, key); } -krb5_error_code KRB5_LIB_FUNCTION -krb5_get_init_creds_keytab(krb5_context context, - krb5_creds *creds, - krb5_principal client, - krb5_keytab keytab, - krb5_deltat start_time, - const char *in_tkt_service, - krb5_get_init_creds_opt *options) -{ - krb5_get_init_creds_ctx ctx; - krb5_error_code ret; - krb5_keytab_key_proc_args *a; - - ret = get_init_creds_common(context, client, start_time, - in_tkt_service, options, &ctx); - if (ret) - goto out; - - a = malloc (sizeof(*a)); - if (a == NULL) { - ret = ENOMEM; - krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); - goto out; - } - a->principal = ctx.cred.client; - a->keytab = keytab; - - ret = krb5_get_in_cred (context, - KDCOptions2int(ctx.flags), - ctx.addrs, - ctx.etypes, - ctx.pre_auth_types, - NULL, - krb5_keytab_key_proc, - a, - NULL, - NULL, - &ctx.cred, - NULL); - free (a); - - if (ret == 0 && creds) - *creds = ctx.cred; - else - krb5_free_cred_contents (context, &ctx.cred); - - out: - free_init_creds_ctx(context, &ctx); - return ret; -} - /* * */ static krb5_error_code -init_creds_init_as_req (krb5_context context, - KDCOptions opts, - const krb5_creds *creds, - const krb5_addresses *addrs, - const krb5_enctype *etypes, - AS_REQ *a) +init_as_req (krb5_context context, + KDCOptions opts, + const krb5_creds *creds, + const krb5_addresses *addrs, + const krb5_enctype *etypes, + AS_REQ *a) { krb5_error_code ret; @@ -906,7 +932,7 @@ make_pa_enc_timestamp(krb5_context context, METHOD_DATA *md, krb5_crypto_destroy(context, crypto); if (ret) return ret; - + ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret); free_EncryptedData(&encdata); if (ret) @@ -924,7 +950,7 @@ static krb5_error_code add_enc_ts_padata(krb5_context context, METHOD_DATA *md, krb5_principal client, - krb5_s2k_proc key_proc, + krb5_s2k_proc keyproc, krb5_const_pointer keyseed, krb5_enctype *enctypes, unsigned netypes, @@ -939,6 +965,8 @@ add_enc_ts_padata(krb5_context context, if(salt == NULL) { /* default to standard salt */ ret = krb5_get_pw_salt (context, client, &salt2); + if (ret) + return ret; salt = &salt2; } if (!enctypes) { @@ -951,8 +979,8 @@ add_enc_ts_padata(krb5_context context, for (i = 0; i < netypes; ++i) { krb5_keyblock *key; - ret = (*key_proc)(context, enctypes[i], keyseed, - *salt, s2kparams, &key); + ret = (*keyproc)(context, enctypes[i], keyseed, + *salt, s2kparams, &key); if (ret) continue; ret = make_pa_enc_timestamp (context, md, enctypes[i], key); @@ -973,28 +1001,28 @@ pa_data_to_md_ts_enc(krb5_context context, struct pa_info_data *ppaid, METHOD_DATA *md) { - if (ctx->key_proc == NULL || ctx->password == NULL) + if (ctx->keyproc == NULL || ctx->keyseed == NULL) return 0; if (ppaid) { add_enc_ts_padata(context, md, client, - ctx->key_proc, ctx->password, + ctx->keyproc, ctx->keyseed, &ppaid->etype, 1, &ppaid->salt, ppaid->s2kparams); } else { krb5_salt salt; - + /* make a v5 salted pa-data */ add_enc_ts_padata(context, md, client, - ctx->key_proc, ctx->password, + ctx->keyproc, ctx->keyseed, a->req_body.etype.val, a->req_body.etype.len, NULL, NULL); - + /* make a v4 salted pa-data */ salt.salttype = KRB5_PW_SALT; krb5_data_zero(&salt.saltvalue); add_enc_ts_padata(context, md, client, - ctx->key_proc, ctx->password, + ctx->keyproc, ctx->keyseed, a->req_body.etype.val, a->req_body.etype.len, &salt, NULL); } @@ -1012,7 +1040,7 @@ pa_data_to_key_plain(krb5_context context, { krb5_error_code ret; - ret = (*ctx->key_proc)(context, etype, ctx->password, + ret = (*ctx->keyproc)(context, etype, ctx->keyseed, salt, s2kparams, key); return ret; } @@ -1058,7 +1086,7 @@ pa_data_add_pac_request(krb5_context context, break; case KRB5_INIT_CREDS_TRISTATE_FALSE: req.include_pac = 0; - } + } ASN1_MALLOC_ENCODE(PA_PAC_REQUEST, buf, length, &req, &len, ret); @@ -1111,12 +1139,12 @@ process_pa_data_to_md(krb5_context context, } else if (in_md->len != 0) { struct pa_info_data paid, *ppaid; - + memset(&paid, 0, sizeof(paid)); - + paid.etype = ENCTYPE_NULL; ppaid = process_pa_info(context, creds->client, a, &paid, in_md); - + pa_data_to_md_ts_enc(context, a, creds->client, ctx, ppaid, *out_md); if (ppaid) free_paid(context, ppaid); @@ -1137,7 +1165,7 @@ process_pa_data_to_key(krb5_context context, krb5_get_init_creds_ctx *ctx, krb5_creds *creds, AS_REQ *a, - krb5_kdc_rep *rep, + AS_REP *rep, const krb5_krbhst_info *hi, krb5_keyblock **key) { @@ -1148,12 +1176,12 @@ process_pa_data_to_key(krb5_context context, memset(&paid, 0, sizeof(paid)); - etype = rep->kdc_rep.enc_part.etype; + etype = rep->enc_part.etype; - if (rep->kdc_rep.padata) { + if (rep->padata) { paid.etype = etype; ppaid = process_pa_info(context, creds->client, a, &paid, - rep->kdc_rep.padata); + rep->padata); } if (ppaid == NULL) { ret = krb5_get_pw_salt (context, creds->client, &paid.salt); @@ -1164,16 +1192,16 @@ process_pa_data_to_key(krb5_context context, } pa = NULL; - if (rep->kdc_rep.padata) { + if (rep->padata) { int idx = 0; - pa = krb5_find_padata(rep->kdc_rep.padata->val, - rep->kdc_rep.padata->len, + pa = krb5_find_padata(rep->padata->val, + rep->padata->len, KRB5_PADATA_PK_AS_REP, &idx); if (pa == NULL) { idx = 0; - pa = krb5_find_padata(rep->kdc_rep.padata->val, - rep->kdc_rep.padata->len, + pa = krb5_find_padata(rep->padata->val, + rep->padata->len, KRB5_PADATA_PK_AS_REP_19, &idx); } @@ -1193,7 +1221,7 @@ process_pa_data_to_key(krb5_context context, ret = EINVAL; krb5_set_error_message(context, ret, N_("no support for PKINIT compiled in", "")); #endif - } else if (ctx->password) + } else if (ctx->keyseed) ret = pa_data_to_key_plain(context, creds->client, ctx, paid.salt, paid.s2kparams, etype, key); else { @@ -1205,109 +1233,340 @@ process_pa_data_to_key(krb5_context context, return ret; } -static krb5_error_code -init_cred_loop(krb5_context context, - krb5_get_init_creds_opt *init_cred_opts, - const krb5_prompter_fct prompter, - void *prompter_data, - krb5_get_init_creds_ctx *ctx, - krb5_creds *creds, - krb5_kdc_rep *ret_as_reply) +/** + * Start a new context to get a new initial credential. + * + * @param context A Kerberos 5 context. + * @param client The Kerberos principal to get the credential for, if + * NULL is given, the default principal is used as determined by + * krb5_get_default_principal(). + * @param prompter + * @param prompter_data + * @param start_time the time the ticket should start to be valid or 0 for now. + * @param options a options structure, can be NULL for default options. + * @param rctx A new allocated free with krb5_init_creds_free(). + * + * @return 0 for success or an Kerberos 5 error code, see krb5_get_error_message(). + * + * @ingroup krb5_credential + */ + +krb5_error_code KRB5_LIB_FUNCTION +krb5_init_creds_init(krb5_context context, + krb5_principal client, + krb5_prompter_fct prompter, + void *prompter_data, + krb5_deltat start_time, + krb5_get_init_creds_opt *options, + krb5_init_creds_context *rctx) { + krb5_init_creds_context ctx; krb5_error_code ret; - krb5_kdc_rep rep; - METHOD_DATA md; - krb5_data resp; - size_t len; - size_t size; - krb5_krbhst_info *hi = NULL; - krb5_sendto_ctx stctx = NULL; - - memset(&md, 0, sizeof(md)); - memset(&rep, 0, sizeof(rep)); + *rctx = NULL; - _krb5_get_init_creds_opt_free_krb5_error(init_cred_opts); - - if (ret_as_reply) - memset(ret_as_reply, 0, sizeof(*ret_as_reply)); + ctx = calloc(1, sizeof(*ctx)); + if (ctx == NULL) { + krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); + return ENOMEM; + } - ret = init_creds_init_as_req(context, ctx->flags, creds, - ctx->addrs, ctx->etypes, &ctx->as_req); - if (ret) + ret = get_init_creds_common(context, client, start_time, options, ctx); + if (ret) { + free(ctx); return ret; - - ret = krb5_sendto_ctx_alloc(context, &stctx); - if (ret) - goto out; - krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL); + } /* Set a new nonce. */ krb5_generate_random_block (&ctx->nonce, sizeof(ctx->nonce)); - ctx->nonce &= 0xffffffff; + ctx->nonce &= 0x7fffffff; /* XXX these just needs to be the same when using Windows PK-INIT */ ctx->pk_nonce = ctx->nonce; - /* - * Increase counter when we want other pre-auth types then - * KRB5_PA_ENC_TIMESTAMP. - */ -#define MAX_PA_COUNTER 3 + ctx->prompter = prompter; + ctx->prompter_data = prompter_data; - ctx->pa_counter = 0; - while (ctx->pa_counter < MAX_PA_COUNTER) { + *rctx = ctx; - ctx->pa_counter++; + return ret; +} - if (ctx->as_req.padata) { - free_METHOD_DATA(ctx->as_req.padata); - free(ctx->as_req.padata); - ctx->as_req.padata = NULL; - } +/** + * Sets the service that the is requested. This call is only neede for + * special initial tickets, by default the a krbtgt is fetched in the default realm. + * + * @param context a Kerberos 5 context. + * @param ctx a krb5_init_creds_context context. + * @param service the service given as a string, for example + * "kadmind/admin". If NULL, the default krbtgt in the clients + * realm is set. + * + * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message(). + * @ingroup krb5_credential + */ - /* Set a new nonce. */ - ctx->as_req.req_body.nonce = ctx->nonce; +krb5_error_code KRB5_LIB_FUNCTION +krb5_init_creds_set_service(krb5_context context, + krb5_init_creds_context ctx, + const char *service) +{ + krb5_const_realm client_realm; + krb5_principal principal; + krb5_error_code ret; + + client_realm = krb5_principal_get_realm (context, ctx->cred.client); - /* fill_in_md_data */ - ret = process_pa_data_to_md(context, creds, &ctx->as_req, ctx, - &md, &ctx->as_req.padata, - prompter, prompter_data); + if (service) { + ret = krb5_parse_name (context, service, &principal); if (ret) - goto out; + return ret; + krb5_principal_set_realm (context, principal, client_realm); + } else { + ret = krb5_make_principal(context, &principal, + client_realm, KRB5_TGS_NAME, client_realm, + NULL); + if (ret) + return ret; + } + krb5_free_principal(context, ctx->cred.server); + ctx->cred.server = principal; - krb5_data_free(&ctx->req_buffer); + return 0; +} - ASN1_MALLOC_ENCODE(AS_REQ, - ctx->req_buffer.data, ctx->req_buffer.length, - &ctx->as_req, &len, ret); - if (ret) - goto out; - if(len != ctx->req_buffer.length) - krb5_abortx(context, "internal error in ASN.1 encoder"); +/** + * Sets the password that will use for the request. + * + * @param context a Kerberos 5 context. + * @param ctx ctx krb5_init_creds_context context. + * @param password the password to use. + * + * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message(). + * @ingroup krb5_credential + */ - ret = krb5_sendto_context (context, stctx, &ctx->req_buffer, - creds->client->realm, &resp); - if (ret) - goto out; +krb5_error_code KRB5_LIB_FUNCTION +krb5_init_creds_set_password(krb5_context context, + krb5_init_creds_context ctx, + const char *password) +{ + if (ctx->password) + memset(ctx->password, 0, strlen(ctx->password)); + if (password) { + ctx->password = strdup(password); + if (ctx->password == NULL) { + krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); + return ENOMEM; + } + ctx->keyseed = (void *) ctx->password; + } else { + ctx->keyseed = NULL; + ctx->password = NULL; + } + + return 0; +} + +static krb5_error_code +keytab_key_proc(krb5_context context, krb5_enctype enctype, + krb5_const_pointer keyseed, + krb5_salt salt, krb5_data *s2kparms, + krb5_keyblock **key) +{ + krb5_keytab_key_proc_args *args = rk_UNCONST(keyseed); + krb5_keytab keytab = args->keytab; + krb5_principal principal = args->principal; + krb5_error_code ret; + krb5_keytab real_keytab; + krb5_keytab_entry entry; + + if(keytab == NULL) + krb5_kt_default(context, &real_keytab); + else + real_keytab = keytab; + + ret = krb5_kt_get_entry (context, real_keytab, principal, + 0, enctype, &entry); + + if (keytab == NULL) + krb5_kt_close (context, real_keytab); + + if (ret) + return ret; + + ret = krb5_copy_keyblock (context, &entry.keyblock, key); + krb5_kt_free_entry(context, &entry); + return ret; +} + + +/** + * Set the keytab to use for authentication. + * + * @param context a Kerberos 5 context. + * @param ctx ctx krb5_init_creds_context context. + * @param keytab the keytab to read the key from. + * + * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message(). + * @ingroup krb5_credential + */ + +krb5_error_code KRB5_LIB_FUNCTION +krb5_init_creds_set_keytab(krb5_context context, + krb5_init_creds_context ctx, + krb5_keytab keytab) +{ + krb5_keytab_key_proc_args *a; + + a = malloc(sizeof(*a)); + if (a == NULL) { + krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); + return ENOMEM; + } + + a->principal = ctx->cred.client; + a->keytab = keytab; + + ctx->keytab_data = a; + ctx->keyseed = (void *)a; + ctx->keyproc = keytab_key_proc; + + return 0; +} + +static krb5_error_code +keyblock_key_proc(krb5_context context, krb5_enctype enctype, + krb5_const_pointer keyseed, + krb5_salt salt, krb5_data *s2kparms, + krb5_keyblock **key) +{ + return krb5_copy_keyblock (context, keyseed, key); +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_init_creds_set_keyblock(krb5_context context, + krb5_init_creds_context ctx, + krb5_keyblock *keyblock) +{ + ctx->keyseed = (void *)keyblock; + ctx->keyproc = keyblock_key_proc; + + return 0; +} + +/** + * The core loop if krb5_get_init_creds() function family. Create the + * packets and have the caller send them off to the KDC. + * + * If the caller want all work been done for them, use + * krb5_init_creds_get() instead. + * + * @param context a Kerberos 5 context. + * @param ctx ctx krb5_init_creds_context context. + * @param in input data from KDC, first round it should be reset by krb5_data_zer(). + * @param out reply to KDC. + * @param hostinfo KDC address info, first round it can be NULL. + * @param flags status of the round, if 1 is set, continue one more round. + * + * @return 0 for success, or an Kerberos 5 error code, see + * krb5_get_error_message(). + * + * @ingroup krb5_credential + */ + +krb5_error_code KRB5_LIB_FUNCTION +krb5_init_creds_step(krb5_context context, + krb5_init_creds_context ctx, + krb5_data *in, + krb5_data *out, + krb5_krbhst_info *hostinfo, + unsigned int *flags) +{ + krb5_error_code ret; + size_t len; + size_t size; - memset (&rep, 0, sizeof(rep)); - ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size); + krb5_data_zero(out); + + if (ctx->as_req.req_body.cname == NULL) { + ret = init_as_req(context, ctx->flags, &ctx->cred, + ctx->addrs, ctx->etypes, &ctx->as_req); + if (ret) { + free_init_creds_ctx(context, ctx); + return ret; + } + } + +#define MAX_PA_COUNTER 10 + if (ctx->pa_counter > MAX_PA_COUNTER) { + krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP, + N_("Looping %d times while getting " + "initial credentials", ""), + ctx->pa_counter); + return KRB5_GET_IN_TKT_LOOP; + } + ctx->pa_counter++; + + /* Lets process the input packet */ + if (in && in->length) { + krb5_kdc_rep rep; + + memset(&rep, 0, sizeof(rep)); + + ret = decode_AS_REP(in->data, in->length, &rep.kdc_rep, &size); if (ret == 0) { - krb5_data_free(&resp); - krb5_clear_error_message(context); - break; + krb5_keyblock *key = NULL; + unsigned eflags = EXTRACT_TICKET_AS_REQ; + + if (ctx->flags.canonicalize) { + eflags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH; + eflags |= EXTRACT_TICKET_MATCH_REALM; + } + if (ctx->ic_flags & KRB5_INIT_CREDS_NO_C_CANON_CHECK) + eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH; + + ret = process_pa_data_to_key(context, ctx, &ctx->cred, + &ctx->as_req, &rep.kdc_rep, hostinfo, &key); + if (ret) { + free_AS_REP(&rep.kdc_rep); + goto out; + } + + ret = _krb5_extract_ticket(context, + &rep, + &ctx->cred, + key, + NULL, + KRB5_KU_AS_REP_ENC_PART, + NULL, + ctx->nonce, + eflags, + NULL, + NULL); + krb5_free_keyblock(context, key); + + *flags = 0; + + if (ret == 0) + ret = copy_EncKDCRepPart(&rep.enc_part, &ctx->enc_part); + + free_AS_REP(&rep.kdc_rep); + free_EncASRepPart(&rep.enc_part); + + return ret; + } else { /* let's try to parse it as a KRB-ERROR */ - KRB_ERROR error; - ret = krb5_rd_error(context, &resp, &error); - if(ret && resp.data && ((char*)resp.data)[0] == 4) + free_KRB_ERROR(&ctx->error); + + ret = krb5_rd_error(context, in, &ctx->error); + if(ret && in->length && ((char*)in->data)[0] == 4) ret = KRB5KRB_AP_ERR_V4_REPLY; - krb5_data_free(&resp); if (ret) goto out; - ret = krb5_error_from_rd_error(context, &error, creds); + ret = krb5_error_from_rd_error(context, &ctx->error, &ctx->cred); /* * If no preauth was set and KDC requires it, give it one @@ -1315,169 +1574,198 @@ init_cred_loop(krb5_context context, */ if (ret == KRB5KDC_ERR_PREAUTH_REQUIRED) { - free_METHOD_DATA(&md); - memset(&md, 0, sizeof(md)); - if (error.e_data) { - ret = decode_METHOD_DATA(error.e_data->data, - error.e_data->length, - &md, + free_METHOD_DATA(&ctx->md); + memset(&ctx->md, 0, sizeof(ctx->md)); + + if (ctx->error.e_data) { + ret = decode_METHOD_DATA(ctx->error.e_data->data, + ctx->error.e_data->length, + &ctx->md, NULL); if (ret) krb5_set_error_message(context, ret, - N_("failed to decode METHOD DATA", "")); + N_("Failed to decode METHOD-DATA", "")); } else { - /* XXX guess what the server want here add add md */ + krb5_set_error_message(context, ret, + N_("Preauth required but no preauth " + "options send by KDC", "")); } - krb5_free_error_contents(context, &error); - if (ret) + } else if (ret == KRB5KRB_AP_ERR_SKEW && context->kdc_sec_offset == 0) { + /* + * Try adapt to timeskrew when we are using pre-auth, and + * if there was a time skew, try again. + */ + krb5_set_real_time(context, ctx->error.stime, -1); + if (context->kdc_sec_offset) + ret = 0; + } else if (ret == KRB5_KDC_ERR_WRONG_REALM && ctx->flags.canonicalize) { + /* client referal to a new realm */ + if (ctx->error.crealm) { + krb5_set_error_message(context, ret, + N_("Got a client referral, not but no realm", "")); goto out; - } else { - _krb5_get_init_creds_opt_set_krb5_error(context, - init_cred_opts, - &error); - if (ret_as_reply) - rep.error = error; - else - krb5_free_error_contents(context, &error); - goto out; + } + ret = krb5_principal_set_realm(context, + ctx->cred.client, + *ctx->error.crealm); } + if (ret) + goto out; } } - { - krb5_keyblock *key = NULL; - unsigned flags = EXTRACT_TICKET_AS_REQ; + if (ctx->as_req.padata) { + free_METHOD_DATA(ctx->as_req.padata); + free(ctx->as_req.padata); + ctx->as_req.padata = NULL; + } - if (ctx->flags.request_anonymous) - flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH; - if (ctx->flags.canonicalize) { - flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH; - flags |= EXTRACT_TICKET_MATCH_REALM; - } - if (ctx->ic_flags & KRB5_INIT_CREDS_NO_C_CANON_CHECK) - flags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH; + /* Set a new nonce. */ + ctx->as_req.req_body.nonce = ctx->nonce; + + /* fill_in_md_data */ + ret = process_pa_data_to_md(context, &ctx->cred, &ctx->as_req, ctx, + &ctx->md, &ctx->as_req.padata, + ctx->prompter, ctx->prompter_data); + if (ret) + goto out; - ret = process_pa_data_to_key(context, ctx, creds, - &ctx->as_req, &rep, hi, &key); - if (ret) - goto out; - - ret = _krb5_extract_ticket(context, - &rep, - creds, - key, - NULL, - KRB5_KU_AS_REP_ENC_PART, - NULL, - ctx->nonce, - flags, - NULL, - NULL); - krb5_free_keyblock(context, key); - } -out: - if (stctx) - krb5_sendto_ctx_free(context, stctx); krb5_data_free(&ctx->req_buffer); - free_METHOD_DATA(&md); - memset(&md, 0, sizeof(md)); - if (ret == 0 && ret_as_reply) - *ret_as_reply = rep; - else - krb5_free_kdc_rep (context, &rep); + ASN1_MALLOC_ENCODE(AS_REQ, + ctx->req_buffer.data, ctx->req_buffer.length, + &ctx->as_req, &len, ret); + if (ret) + goto out; + if(len != ctx->req_buffer.length) + krb5_abortx(context, "internal error in ASN.1 encoder"); + + out->data = ctx->req_buffer.data; + out->length = ctx->req_buffer.length; + + *flags = 1; + + return 0; + out: return ret; } +/** + * Extract the newly acquired credentials from krb5_init_creds_context + * context. + * + * @param context A Kerberos 5 context. + * @param ctx + * @param cred credentials, free with krb5_free_cred_contents(). + * + * @return 0 for sucess or An Kerberos error code, see krb5_get_error_message(). + */ + krb5_error_code KRB5_LIB_FUNCTION -krb5_get_init_creds(krb5_context context, - krb5_creds *creds, - krb5_principal client, - krb5_prompter_fct prompter, - void *data, - krb5_deltat start_time, - const char *in_tkt_service, - krb5_get_init_creds_opt *options) +krb5_init_creds_get_creds(krb5_context context, + krb5_init_creds_context ctx, + krb5_creds *cred) { - krb5_get_init_creds_ctx ctx; - krb5_kdc_rep kdc_reply; - krb5_error_code ret; - char buf[BUFSIZ]; - int done; + return krb5_copy_creds_contents(context, &ctx->cred, cred); +} + +/** + * Get the last error from the transaction. + * + * @return Returns 0 or an error code + * + * @ingroup krb5_credential + */ - memset(&kdc_reply, 0, sizeof(kdc_reply)); +krb5_error_code KRB5_LIB_FUNCTION +krb5_init_creds_get_error(krb5_context context, + krb5_init_creds_context ctx, + KRB_ERROR *error) +{ + krb5_error_code ret; - ret = get_init_creds_common(context, client, start_time, - in_tkt_service, options, &ctx); + ret = copy_KRB_ERROR(&ctx->error, error); if (ret) - goto out; + krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); - done = 0; - while(!done) { - memset(&kdc_reply, 0, sizeof(kdc_reply)); - - ret = init_cred_loop(context, - options, - prompter, - data, - &ctx, - &ctx.cred, - &kdc_reply); - - switch (ret) { - case 0 : - done = 1; - break; - case KRB5KDC_ERR_KEY_EXPIRED : - /* try to avoid recursion */ + return ret; +} - /* don't try to change password where then where none */ - if (prompter == NULL || ctx.password == NULL) - goto out; +/** + * Free the krb5_init_creds_context allocated by krb5_init_creds_init(). + * + * @param context A Kerberos 5 context. + * @param ctx The krb5_init_creds_context to free. + * + * @ingroup krb5_credential + */ - krb5_clear_error_message (context); +void KRB5_LIB_FUNCTION +krb5_init_creds_free(krb5_context context, + krb5_init_creds_context ctx) +{ + free_init_creds_ctx(context, ctx); + free(ctx); +} - if (ctx.in_tkt_service != NULL - && strcmp (ctx.in_tkt_service, "kadmin/changepw") == 0) - goto out; +/** + * Get new credentials as setup by the krb5_init_creds_context. + * + * @param context A Kerberos 5 context. + * @param ctx The krb5_init_creds_context to process. + * + * @ingroup krb5_credential + */ - ret = change_password (context, - client, - ctx.password, - buf, - sizeof(buf), - prompter, - data, - options); - if (ret) - goto out; - ctx.password = buf; +krb5_error_code KRB5_LIB_FUNCTION +krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx) +{ + krb5_sendto_ctx stctx = NULL; + krb5_krbhst_info *hostinfo = NULL; + krb5_error_code ret; + krb5_data in, out; + unsigned int flags = 0; + + krb5_data_zero(&in); + krb5_data_zero(&out); + + ret = krb5_sendto_ctx_alloc(context, &stctx); + if (ret) + goto out; + krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL); + + while (1) { + flags = 0; + ret = krb5_init_creds_step(context, ctx, &in, &out, hostinfo, &flags); + krb5_data_free(&in); + if (ret) + goto out; + + if ((flags & 1) == 0) break; - default: + + ret = krb5_sendto_context (context, stctx, &out, + ctx->cred.client->realm, &in); + if (ret) goto out; - } - } - if (prompter) - print_expire (context, - krb5_principal_get_realm (context, ctx.cred.client), - &kdc_reply, - prompter, - data); + } out: - memset (buf, 0, sizeof(buf)); - free_init_creds_ctx(context, &ctx); - krb5_free_kdc_rep (context, &kdc_reply); - if (ret == 0) - *creds = ctx.cred; - else - krb5_free_cred_contents (context, &ctx.cred); + if (stctx) + krb5_sendto_ctx_free(context, stctx); return ret; } +/** + * Get new credentials using password. + * + * @ingroup krb5_credential + */ + + krb5_error_code KRB5_LIB_FUNCTION krb5_get_init_creds_password(krb5_context context, krb5_creds *creds, @@ -1487,29 +1775,23 @@ krb5_get_init_creds_password(krb5_context context, void *data, krb5_deltat start_time, const char *in_tkt_service, - krb5_get_init_creds_opt *in_options) + krb5_get_init_creds_opt *options) { - krb5_get_init_creds_opt *options; + krb5_init_creds_context ctx; char buf[BUFSIZ]; krb5_error_code ret; + int chpw = 0; - if (in_options == NULL) { - const char *realm = krb5_principal_get_realm(context, client); - ret = krb5_get_init_creds_opt_alloc(context, &options); - if (ret == 0) - krb5_get_init_creds_opt_set_default_flags(context, - NULL, - realm, - options); - } else - ret = _krb5_get_init_creds_opt_copy(context, in_options, &options); + again: + ret = krb5_init_creds_init(context, client, prompter, data, start_time, options, &ctx); if (ret) - return ret; + goto out; - if (password == NULL && - options->opt_private->password == NULL && - options->opt_private->pk_init_ctx == NULL) - { + ret = krb5_init_creds_set_service(context, ctx, in_tkt_service); + if (ret) + goto out; + + if (prompter != NULL && ctx->password == NULL && password == NULL) { krb5_prompt prompt; krb5_data password_data; char *p, *q; @@ -1528,40 +1810,67 @@ krb5_get_init_creds_password(krb5_context context, free (q); if (ret) { memset (buf, 0, sizeof(buf)); - krb5_get_init_creds_opt_free(context, options); ret = KRB5_LIBOS_PWDINTR; krb5_clear_error_message (context); - return ret; + goto out; } password = password_data.data; } - if (options->opt_private->password == NULL) { - ret = krb5_get_init_creds_opt_set_pa_password(context, options, - password, NULL); - if (ret) { - krb5_get_init_creds_opt_free(context, options); - memset(buf, 0, sizeof(buf)); - return ret; - } + if (password) { + ret = krb5_init_creds_set_password(context, ctx, password); + if (ret) + goto out; } - ret = krb5_get_init_creds(context, creds, client, prompter, - data, start_time, in_tkt_service, options); - krb5_get_init_creds_opt_free(context, options); + ret = krb5_init_creds_get(context, ctx); + + if (ret == 0) + process_last_request(context, options, ctx); + + + if (ret == KRB5KDC_ERR_KEY_EXPIRED && chpw == 0) { + char buf[1024]; + + /* try to avoid recursion */ + if (in_tkt_service != NULL && strcmp(in_tkt_service, "kadmin/changepw") == 0) + goto out; + + /* don't try to change password where then where none */ + if (prompter == NULL) + goto out; + + ret = change_password (context, + client, + ctx->password, + buf, + sizeof(buf), + prompter, + data, + options); + if (ret) + goto out; + chpw = 1; + krb5_init_creds_free(context, ctx); + goto again; + } + + out: + if (ret == 0) + krb5_init_creds_get_creds(context, ctx, creds); + + if (ctx) + krb5_init_creds_free(context, ctx); + memset(buf, 0, sizeof(buf)); return ret; } -static krb5_error_code -init_creds_keyblock_key_proc (krb5_context context, - krb5_enctype type, - krb5_salt salt, - krb5_const_pointer keyseed, - krb5_keyblock **key) -{ - return krb5_copy_keyblock (context, keyseed, key); -} +/** + * Get new credentials using keyblock. + * + * @ingroup krb5_credential + */ krb5_error_code KRB5_LIB_FUNCTION krb5_get_init_creds_keyblock(krb5_context context, @@ -1572,33 +1881,80 @@ krb5_get_init_creds_keyblock(krb5_context context, const char *in_tkt_service, krb5_get_init_creds_opt *options) { - struct krb5_get_init_creds_ctx ctx; + krb5_init_creds_context ctx; krb5_error_code ret; - ret = get_init_creds_common(context, client, start_time, - in_tkt_service, options, &ctx); + memset(creds, 0, sizeof(*creds)); + + ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx); if (ret) goto out; - ret = krb5_get_in_cred (context, - KDCOptions2int(ctx.flags), - ctx.addrs, - ctx.etypes, - ctx.pre_auth_types, - NULL, - init_creds_keyblock_key_proc, - keyblock, - NULL, - NULL, - &ctx.cred, - NULL); - - if (ret == 0 && creds) - *creds = ctx.cred; - else - krb5_free_cred_contents (context, &ctx.cred); + ret = krb5_init_creds_set_service(context, ctx, in_tkt_service); + if (ret) + goto out; + + ret = krb5_init_creds_set_keyblock(context, ctx, keyblock); + if (ret) + goto out; + + ret = krb5_init_creds_get(context, ctx); + + if (ret == 0) + process_last_request(context, options, ctx); + + out: + if (ret == 0) + krb5_init_creds_get_creds(context, ctx, creds); + + if (ctx) + krb5_init_creds_free(context, ctx); + + return ret; +} + +/** + * Get new credentials using keytab. + * + * @ingroup krb5_credential + */ + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_init_creds_keytab(krb5_context context, + krb5_creds *creds, + krb5_principal client, + krb5_keytab keytab, + krb5_deltat start_time, + const char *in_tkt_service, + krb5_get_init_creds_opt *options) +{ + krb5_init_creds_context ctx; + krb5_error_code ret; + + memset(creds, 0, sizeof(*creds)); + + ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx); + if (ret) + goto out; + + ret = krb5_init_creds_set_service(context, ctx, in_tkt_service); + if (ret) + goto out; + + ret = krb5_init_creds_set_keytab(context, ctx, keytab); + if (ret) + goto out; + + ret = krb5_init_creds_get(context, ctx); + if (ret == 0) + process_last_request(context, options, ctx); out: - free_init_creds_ctx(context, &ctx); + if (ret == 0) + krb5_init_creds_get_creds(context, ctx, creds); + + if (ctx) + krb5_init_creds_free(context, ctx); + return ret; } |