Adding upstream version 2.4.57.upstream/2.4.57

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 749 insertions, 0 deletions

diff --git a/modules/md/md_acme_acct.c b/modules/md/md_acme_acct.c
new file mode 100644
index 0000000..f3e043e
--- /dev/null
+++ b/modules/md/md_acme_acct.c
@@ -0,0 +1,749 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+#include <assert.h>
+#include <stdio.h>
+
+#include <apr_lib.h>
+#include <apr_file_info.h>
+#include <apr_file_io.h>
+#include <apr_fnmatch.h>
+#include <apr_hash.h>
+#include <apr_strings.h>
+#include <apr_tables.h>
+
+#include "md.h"
+#include "md_crypt.h"
+#include "md_json.h"
+#include "md_jws.h"
+#include "md_log.h"
+#include "md_result.h"
+#include "md_store.h"
+#include "md_util.h"
+#include "md_version.h"
+
+#include "md_acme.h"
+#include "md_acme_acct.h"
+
+static apr_status_t acct_make(md_acme_acct_t **pacct, apr_pool_t *p, 
+                              const char *ca_url, apr_array_header_t *contacts)
+{
+    md_acme_acct_t *acct;
+    
+    acct = apr_pcalloc(p, sizeof(*acct));
+    acct->ca_url = ca_url;
+    if (!contacts || apr_is_empty_array(contacts)) {
+        acct->contacts = apr_array_make(p, 5, sizeof(const char *));
+    }
+    else {
+        acct->contacts = apr_array_copy(p, contacts);
+    }
+    
+    *pacct = acct;
+    return APR_SUCCESS;
+}
+
+
+static const char *mk_acct_id(apr_pool_t *p, md_acme_t *acme, int i)
+{
+    return apr_psprintf(p, "ACME-%s-%04d", acme->sname, i);
+}
+
+static const char *mk_acct_pattern(apr_pool_t *p, md_acme_t *acme)
+{
+    return apr_psprintf(p, "ACME-%s-*", acme->sname);
+}
+ 
+/**************************************************************************************************/
+/* json load/save */
+
+static md_acme_acct_st acct_st_from_str(const char *s) 
+{
+    if (s) {
+        if (!strcmp("valid", s)) {
+            return MD_ACME_ACCT_ST_VALID;
+        }
+        else if (!strcmp("deactivated", s)) {
+            return MD_ACME_ACCT_ST_DEACTIVATED;
+        }
+        else if (!strcmp("revoked", s)) {
+            return MD_ACME_ACCT_ST_REVOKED;
+        }
+    }
+    return MD_ACME_ACCT_ST_UNKNOWN;
+}
+
+md_json_t *md_acme_acct_to_json(md_acme_acct_t *acct, apr_pool_t *p)
+{
+    md_json_t *jacct;
+    const char *s;
+
+    assert(acct);
+    jacct = md_json_create(p);
+    switch (acct->status) {
+        case MD_ACME_ACCT_ST_VALID:
+            s = "valid";
+            break;
+        case MD_ACME_ACCT_ST_DEACTIVATED:
+            s = "deactivated";
+            break;
+        case MD_ACME_ACCT_ST_REVOKED:
+            s = "revoked";
+            break;
+        default:
+            s = NULL;
+            break;
+    }    
+    if (s) md_json_sets(s, jacct, MD_KEY_STATUS, NULL);
+    if (acct->url) md_json_sets(acct->url, jacct, MD_KEY_URL, NULL);
+    if (acct->ca_url) md_json_sets(acct->ca_url, jacct, MD_KEY_CA_URL, NULL);
+    if (acct->contacts) md_json_setsa(acct->contacts, jacct, MD_KEY_CONTACT, NULL);
+    if (acct->registration) md_json_setj(acct->registration, jacct, MD_KEY_REGISTRATION, NULL);
+    if (acct->agreement) md_json_sets(acct->agreement, jacct, MD_KEY_AGREEMENT, NULL);
+    if (acct->orders) md_json_sets(acct->orders, jacct, MD_KEY_ORDERS, NULL);
+    if (acct->eab_kid) md_json_sets(acct->eab_kid, jacct, MD_KEY_EAB, MD_KEY_KID, NULL);
+    if (acct->eab_hmac) md_json_sets(acct->eab_hmac, jacct, MD_KEY_EAB, MD_KEY_HMAC, NULL);
+
+    return jacct;
+}
+
+apr_status_t md_acme_acct_from_json(md_acme_acct_t **pacct, md_json_t *json, apr_pool_t *p)
+{
+    apr_status_t rv = APR_EINVAL;
+    md_acme_acct_t *acct;
+    md_acme_acct_st status = MD_ACME_ACCT_ST_UNKNOWN;
+    const char *ca_url, *url;
+    apr_array_header_t *contacts;
+    
+    if (md_json_has_key(json, MD_KEY_STATUS, NULL)) {
+        status = acct_st_from_str(md_json_gets(json, MD_KEY_STATUS, NULL));
+    }
+
+    url = md_json_gets(json, MD_KEY_URL, NULL);
+    if (!url) {
+        md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, 0, p, "account has no url");
+        goto leave;
+    }
+
+    ca_url = md_json_gets(json, MD_KEY_CA_URL, NULL);
+    if (!ca_url) {
+        md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, 0, p, "account has no CA url: %s", url);
+        goto leave;
+    }
+    
+    contacts = apr_array_make(p, 5, sizeof(const char *));
+    if (md_json_has_key(json, MD_KEY_CONTACT, NULL)) {
+        md_json_getsa(contacts, json, MD_KEY_CONTACT, NULL);
+    }
+    else {
+        md_json_getsa(contacts, json, MD_KEY_REGISTRATION, MD_KEY_CONTACT, NULL);
+    }
+    rv = acct_make(&acct, p, ca_url, contacts);
+    if (APR_SUCCESS != rv) goto leave;
+
+    acct->status = status;
+    acct->url = url;
+    acct->agreement = md_json_gets(json, MD_KEY_AGREEMENT, NULL);
+    if (!acct->agreement) {
+        /* backward compatible check */
+        acct->agreement = md_json_gets(json, "terms-of-service", NULL);
+    }
+    acct->orders = md_json_gets(json, MD_KEY_ORDERS, NULL);
+    if (md_json_has_key(json, MD_KEY_EAB, MD_KEY_KID, NULL)
+        && md_json_has_key(json, MD_KEY_EAB, MD_KEY_HMAC, NULL)) {
+        acct->eab_kid = md_json_gets(json, MD_KEY_EAB, MD_KEY_KID, NULL);
+        acct->eab_hmac = md_json_gets(json, MD_KEY_EAB, MD_KEY_HMAC, NULL);
+    }
+
+leave:
+    *pacct = (APR_SUCCESS == rv)? acct : NULL;
+    return rv;
+}
+
+apr_status_t md_acme_acct_save(md_store_t *store, apr_pool_t *p, md_acme_t *acme, 
+                               const char **pid, md_acme_acct_t *acct, md_pkey_t *acct_key)
+{
+    md_json_t *jacct;
+    apr_status_t rv;
+    int i;
+    const char *id = pid? *pid : NULL;
+    
+    jacct = md_acme_acct_to_json(acct, p);
+    if (id) {
+        rv = md_store_save(store, p, MD_SG_ACCOUNTS, id, MD_FN_ACCOUNT, MD_SV_JSON, jacct, 0);
+    }
+    else {
+        rv = APR_EAGAIN;
+        for (i = 0; i < 1000 && APR_SUCCESS != rv; ++i) {
+            id = mk_acct_id(p, acme, i);
+            rv = md_store_save(store, p, MD_SG_ACCOUNTS, id, MD_FN_ACCOUNT, MD_SV_JSON, jacct, 1);
+        }
+    }
+    if (APR_SUCCESS == rv) {
+        if (pid) *pid = id;
+        rv = md_store_save(store, p, MD_SG_ACCOUNTS, id, MD_FN_ACCT_KEY, MD_SV_PKEY, acct_key, 0);
+    }
+    return rv;
+}
+
+apr_status_t md_acme_acct_load(md_acme_acct_t **pacct, md_pkey_t **ppkey,
+                               md_store_t *store, md_store_group_t group, 
+                               const char *name, apr_pool_t *p)
+{
+    md_json_t *json;
+    apr_status_t rv;
+
+    rv = md_store_load_json(store, group, name, MD_FN_ACCOUNT, &json, p);
+    if (APR_STATUS_IS_ENOENT(rv)) {
+        goto out;
+    }
+    if (APR_SUCCESS != rv) {
+        md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, rv, p, "error reading account: %s", name);
+        goto out;
+    }
+    
+    rv = md_acme_acct_from_json(pacct, json, p);
+    if (APR_SUCCESS == rv) {
+        rv = md_store_load(store, group, name, MD_FN_ACCT_KEY, MD_SV_PKEY, (void**)ppkey, p);
+        if (APR_SUCCESS != rv) {
+            md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, rv, p, "loading key: %s", name);
+            goto out;
+        }
+    }
+out:
+    if (APR_SUCCESS != rv) {
+        *pacct = NULL;
+        *ppkey = NULL;
+    } 
+    return rv;
+}
+
+/**************************************************************************************************/
+/* Lookup */
+
+int md_acme_acct_matches_url(md_acme_acct_t *acct, const char *url)
+{
+    /* The ACME url must match exactly */
+    if (!url || !acct->ca_url || strcmp(acct->ca_url, url)) return 0;
+    return 1;
+}
+
+int md_acme_acct_matches_md(md_acme_acct_t *acct, const md_t *md)
+{
+    if (!md_acme_acct_matches_url(acct, md->ca_effective)) return 0;
+    /* if eab values are not mentioned, we match an account regardless
+     * if it was registered with eab or not */
+    if (!md->ca_eab_kid || !md->ca_eab_hmac) {
+        /* No eab only acceptable when no eab is asked for.
+         * This prevents someone that has no external account binding
+         * to re-use an account from another MDomain that was created
+         * with a binding. */
+        return !acct->eab_kid || !acct->eab_hmac;
+    }
+    /* But of eab is asked for, we need an acct that matches exactly.
+     * When someone configures a new EAB and we need
+     * to created a new account for it. */
+    if (!acct->eab_kid || !acct->eab_hmac) return 0;
+    return !strcmp(acct->eab_kid, md->ca_eab_kid)
+           && !strcmp(acct->eab_hmac, md->ca_eab_hmac);
+}
+
+typedef struct {
+    apr_pool_t *p;
+    const md_t *md;
+    const char *id;
+} find_ctx;
+
+static int find_acct(void *baton, const char *name, const char *aspect,
+                     md_store_vtype_t vtype, void *value, apr_pool_t *ptemp)
+{
+    find_ctx *ctx = baton;
+    md_acme_acct_t *acct;
+    apr_status_t rv;
+
+    (void)aspect;
+    (void)ptemp;
+    md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, 0, ctx->p, "account candidate %s/%s", name, aspect); 
+    if (MD_SV_JSON == vtype) {
+        rv = md_acme_acct_from_json(&acct, (md_json_t*)value, ptemp);
+        if (APR_SUCCESS != rv) goto cleanup;
+
+        if (MD_ACME_ACCT_ST_VALID == acct->status
+            && (!ctx->md || md_acme_acct_matches_md(acct, ctx->md))) {
+            md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, 0, ctx->p, 
+                          "found account %s for %s: %s, status=%d",
+                          acct->id, ctx->md->ca_effective, aspect, acct->status);
+            ctx->id = apr_pstrdup(ctx->p, name);
+            return 0;
+        }
+    }
+cleanup:
+    return 1;
+}
+
+static apr_status_t acct_find(const char **pid, md_acme_acct_t **pacct, md_pkey_t **ppkey, 
+                              md_store_t *store, md_store_group_t group,
+                              const char *name_pattern,
+                              const md_t *md, apr_pool_t *p)
+{
+    apr_status_t rv;
+    find_ctx ctx;
+
+    memset(&ctx, 0, sizeof(ctx));
+    ctx.p = p;
+    ctx.md = md;
+
+    rv = md_store_iter(find_acct, &ctx, store, p, group, name_pattern, MD_FN_ACCOUNT, MD_SV_JSON);
+    if (ctx.id) {
+        *pid = ctx.id;
+        rv = md_acme_acct_load(pacct, ppkey, store, group, ctx.id, p);
+        md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, rv, p, "acct_find: got account %s", ctx.id);
+    }
+    else {
+        *pacct = NULL;
+        rv = APR_ENOENT;
+        md_log_perror(MD_LOG_MARK, MD_LOG_TRACE1, 0, p, "acct_find: none found"); 
+    }
+    return rv;
+}
+
+static apr_status_t acct_find_and_verify(md_store_t *store, md_store_group_t group, 
+                                         const char *name_pattern,
+                                         md_acme_t *acme, const md_t *md,
+                                         apr_pool_t *p)
+{
+    md_acme_acct_t *acct;
+    md_pkey_t *pkey;
+    const char *id;
+    apr_status_t rv;
+
+    rv = acct_find(&id, &acct, &pkey, store, group, name_pattern, md, p);
+    if (APR_SUCCESS == rv) {
+        md_log_perror(MD_LOG_MARK, MD_LOG_TRACE1, 0, p, "acct_find_and_verify: found %s",
+                      id);
+        acme->acct_id = (MD_SG_STAGING == group)? NULL : id;
+        acme->acct = acct;
+        acme->acct_key = pkey;
+        rv = md_acme_acct_validate(acme, (MD_SG_STAGING == group)? NULL : store, p);
+        md_log_perror(MD_LOG_MARK, MD_LOG_TRACE1, rv, p, "acct_find_and_verify: verified %s",
+                      id);
+
+        if (APR_SUCCESS != rv) {
+            acme->acct_id = NULL;
+            acme->acct = NULL;
+            acme->acct_key = NULL;
+            if (APR_STATUS_IS_ENOENT(rv)) {
+                /* verification failed and account has been disabled.
+                   Indicate to caller that he may try again. */
+                rv = APR_EAGAIN;
+            }
+        }
+    }
+    return rv;
+}
+
+apr_status_t md_acme_find_acct_for_md(md_acme_t *acme, md_store_t *store, const md_t *md)
+{
+    apr_status_t rv;
+    
+    while (APR_EAGAIN == (rv = acct_find_and_verify(store, MD_SG_ACCOUNTS, 
+                                                    mk_acct_pattern(acme->p, acme), 
+                                                    acme, md, acme->p))) {
+        /* nop */
+    }
+    
+    if (APR_STATUS_IS_ENOENT(rv)) {
+        /* No suitable account found in MD_SG_ACCOUNTS. Maybe a new account
+         * can already be found in MD_SG_STAGING? */
+        md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, 0, acme->p, 
+                      "no account found, looking in STAGING");
+        rv = acct_find_and_verify(store, MD_SG_STAGING, "*", acme, md, acme->p);
+        if (APR_EAGAIN == rv) {
+            rv = APR_ENOENT;
+        }
+    }
+    return rv;
+}
+
+apr_status_t md_acme_acct_id_for_md(const char **pid, md_store_t *store,
+                                    md_store_group_t group, const md_t *md,
+                                    apr_pool_t *p)
+{
+    apr_status_t rv;
+    find_ctx ctx;
+
+    memset(&ctx, 0, sizeof(ctx));
+    ctx.p = p;
+    ctx.md = md;
+
+    rv = md_store_iter(find_acct, &ctx, store, p, group, "*", MD_FN_ACCOUNT, MD_SV_JSON);
+    if (ctx.id) {
+        *pid = ctx.id;
+        rv = APR_SUCCESS;
+    }
+    md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, rv, p, "acct_id_for_md %s -> %s", md->name, *pid);
+    return rv;
+}
+
+/**************************************************************************************************/
+/* acct operation context */
+typedef struct {
+    md_acme_t *acme;
+    apr_pool_t *p;
+    const char *agreement;
+    const char *eab_kid;
+    const char *eab_hmac;
+} acct_ctx_t;
+
+/**************************************************************************************************/
+/* acct update */
+
+static apr_status_t on_init_acct_upd(md_acme_req_t *req, void *baton)
+{
+    (void)baton;
+    return md_acme_req_body_init(req, NULL);
+} 
+
+static apr_status_t acct_upd(md_acme_t *acme, apr_pool_t *p, 
+                             const apr_table_t *hdrs, md_json_t *body, void *baton)
+{
+    acct_ctx_t *ctx = baton;
+    apr_status_t rv = APR_SUCCESS;
+    md_acme_acct_t *acct = acme->acct;
+
+    if (md_log_is_level(p, MD_LOG_TRACE2)) {
+        md_log_perror(MD_LOG_MARK, MD_LOG_TRACE2, 0, acme->p, "acct update response: %s",
+                      md_json_writep(body, p, MD_JSON_FMT_COMPACT));
+    }
+
+    if (!acct->url) {
+        const char *location = apr_table_get(hdrs, "location");
+        if (!location) {
+            md_log_perror(MD_LOG_MARK, MD_LOG_WARNING, APR_EINVAL, p, "new acct without location");
+            return APR_EINVAL;
+        }
+        acct->url = apr_pstrdup(ctx->p, location);
+    }
+    
+    apr_array_clear(acct->contacts);
+    md_json_dupsa(acct->contacts, acme->p, body, MD_KEY_CONTACT, NULL);
+    if (md_json_has_key(body, MD_KEY_STATUS, NULL)) {
+        acct->status = acct_st_from_str(md_json_gets(body, MD_KEY_STATUS, NULL));
+    }
+    if (md_json_has_key(body, MD_KEY_AGREEMENT, NULL)) {
+        acct->agreement = md_json_dups(acme->p, body, MD_KEY_AGREEMENT, NULL);
+    }
+    if (md_json_has_key(body, MD_KEY_ORDERS, NULL)) {
+        acct->orders = md_json_dups(acme->p, body, MD_KEY_ORDERS, NULL);
+    }
+    if (ctx->eab_kid && ctx->eab_hmac) {
+        acct->eab_kid = ctx->eab_kid;
+        acct->eab_hmac = ctx->eab_hmac;
+    }
+    acct->registration = md_json_clone(ctx->p, body);
+    
+    md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, rv, p, "updated acct %s", acct->url);
+    return rv;
+}
+
+apr_status_t md_acme_acct_update(md_acme_t *acme)
+{
+    acct_ctx_t ctx;
+    
+    md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, 0, acme->p, "acct update");
+    if (!acme->acct) {
+        return APR_EINVAL;
+    }
+    memset(&ctx, 0, sizeof(ctx));
+    ctx.acme = acme;
+    ctx.p = acme->p;
+    return md_acme_POST(acme, acme->acct->url, on_init_acct_upd, acct_upd, NULL, NULL, &ctx);
+}
+
+apr_status_t md_acme_acct_validate(md_acme_t *acme, md_store_t *store, apr_pool_t *p)
+{
+    apr_status_t rv;
+    
+    if (APR_SUCCESS != (rv = md_acme_acct_update(acme))) {
+        md_log_perror(MD_LOG_MARK, MD_LOG_TRACE1, rv, acme->p,
+                      "acct update failed for %s", acme->acct->url);
+        if (APR_EINVAL == rv && (acme->acct->agreement || !acme->ca_agreement)) {
+            /* Sadly, some proprietary ACME servers choke on empty POSTs
+             * on accounts. Try a faked ToS agreement. */
+            md_log_perror(MD_LOG_MARK, MD_LOG_TRACE1, rv, acme->p,
+                          "trying acct update via ToS agreement");
+            rv = md_acme_agree(acme, p, "accepted");
+        }
+        if (acme->acct && (APR_ENOENT == rv || APR_EACCES == rv || APR_EINVAL == rv)) {
+            if (MD_ACME_ACCT_ST_VALID == acme->acct->status) {
+                acme->acct->status = MD_ACME_ACCT_ST_UNKNOWN;
+                if (store) {
+                    md_acme_acct_save(store, p, acme, &acme->acct_id, acme->acct, acme->acct_key); 
+                }
+            }
+            acme->acct = NULL;
+            acme->acct_key = NULL;
+            rv = APR_ENOENT;
+        }
+    }
+    return rv;
+}
+
+/**************************************************************************************************/
+/* Register a new account */
+
+static apr_status_t get_eab(md_json_t **peab, md_acme_req_t *req, const char *kid,
+                            const char *hmac64, md_pkey_t *account_key,
+                            const char *url)
+{
+    md_json_t *eab, *prot_fields, *jwk;
+    md_data_t payload, hmac_key;
+    apr_status_t rv;
+
+    prot_fields = md_json_create(req->p);
+    md_json_sets(url, prot_fields, "url", NULL);
+    md_json_sets(kid, prot_fields, "kid", NULL);
+
+    rv = md_jws_get_jwk(&jwk, req->p, account_key);
+    if (APR_SUCCESS != rv) goto cleanup;
+
+    md_data_null(&payload);
+    payload.data = md_json_writep(jwk, req->p, MD_JSON_FMT_COMPACT);
+    if (!payload.data) {
+        rv = APR_EINVAL;
+        goto cleanup;
+    }
+    payload.len = strlen(payload.data);
+
+    md_util_base64url_decode(&hmac_key, hmac64, req->p);
+    if (!hmac_key.len) {
+        rv = APR_EINVAL;
+        md_result_problem_set(req->result, rv, "apache:eab-hmac-invalid",
+                              "external account binding HMAC value is not valid base64", NULL);
+        goto cleanup;
+    }
+
+    rv = md_jws_hmac(&eab, req->p, &payload, prot_fields, &hmac_key);
+    if (APR_SUCCESS != rv) {
+        md_result_problem_set(req->result, rv, "apache:eab-hmac-fail",
+                              "external account binding MAC could not be computed", NULL);
+    }
+
+cleanup:
+    *peab = (APR_SUCCESS == rv)? eab : NULL;
+    return rv;
+}
+
+static apr_status_t on_init_acct_new(md_acme_req_t *req, void *baton)
+{
+    acct_ctx_t *ctx = baton;
+    md_json_t *jpayload, *jeab;
+    apr_status_t rv;
+
+    jpayload = md_json_create(req->p);
+    md_json_setsa(ctx->acme->acct->contacts, jpayload, MD_KEY_CONTACT, NULL);
+    if (ctx->agreement) {
+        md_json_setb(1, jpayload, "termsOfServiceAgreed", NULL);
+    }
+    if (ctx->eab_kid && ctx->eab_hmac) {
+        rv = get_eab(&jeab, req, ctx->eab_kid, ctx->eab_hmac,
+                     req->acme->acct_key, req->url);
+        if (APR_SUCCESS != rv) goto cleanup;
+        md_json_setj(jeab, jpayload, "externalAccountBinding", NULL);
+    }
+    rv = md_acme_req_body_init(req, jpayload);
+
+cleanup:
+    return rv;
+} 
+
+apr_status_t md_acme_acct_register(md_acme_t *acme, md_store_t *store,
+                                   const md_t *md, apr_pool_t *p)
+{
+    apr_status_t rv;
+    md_pkey_t *pkey;
+    const char *err = NULL, *uri;
+    md_pkey_spec_t spec;
+    int i;
+    acct_ctx_t ctx;
+    
+    md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, 0, p, "create new account");
+
+    memset(&ctx, 0, sizeof(ctx));
+    ctx.acme = acme;
+    ctx.p = p;
+    /* The agreement URL is submitted when the ACME server announces Terms-of-Service
+     * in its directory meta data. The magic value "accepted" will always use the
+     * advertised URL. */
+    ctx.agreement = NULL;
+    if (acme->ca_agreement && md->ca_agreement) {
+        ctx.agreement = !strcmp("accepted", md->ca_agreement)?
+            acme->ca_agreement : md->ca_agreement;
+    }
+    
+    if (ctx.agreement) {
+        if (APR_SUCCESS != (rv = md_util_abs_uri_check(acme->p, ctx.agreement, &err))) {
+            md_log_perror(MD_LOG_MARK, MD_LOG_ERR, 0, p, 
+                          "invalid agreement uri (%s): %s", err, ctx.agreement);
+            goto out;
+        }
+    }
+    ctx.eab_kid = md->ca_eab_kid;
+    ctx.eab_hmac = md->ca_eab_hmac;
+    
+    for (i = 0; i < md->contacts->nelts; ++i) {
+        uri = APR_ARRAY_IDX(md->contacts, i, const char *);
+        if (APR_SUCCESS != (rv = md_util_abs_uri_check(acme->p, uri, &err))) {
+            md_log_perror(MD_LOG_MARK, MD_LOG_ERR, 0, p, 
+                          "invalid contact uri (%s): %s", err, uri);
+            goto out;
+        }
+    }
+    
+    /* If there is no key selected yet, try to find an existing one for the same host. 
+     * Let's Encrypt identifies accounts by their key for their ACMEv1 and v2 services.
+     * Although the account appears on both services with different urls, it is 
+     * internally the same one.
+     * I think this is beneficial if someone migrates from ACMEv1 to v2 and not a leak
+     * of identifying information.
+     */
+    if (!acme->acct_key) {
+        find_ctx fctx;
+
+        memset(&fctx, 0, sizeof(fctx));
+        fctx.p = p;
+        fctx.md = md;
+
+        md_store_iter(find_acct, &fctx, store, p, MD_SG_ACCOUNTS, 
+                      mk_acct_pattern(p, acme), MD_FN_ACCOUNT, MD_SV_JSON);
+        if (fctx.id) {
+            rv = md_store_load(store, MD_SG_ACCOUNTS, fctx.id, MD_FN_ACCT_KEY, MD_SV_PKEY,
+                               (void**)&acme->acct_key, p);
+            if (APR_SUCCESS == rv) {
+                md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, rv, p,
+                              "reusing key from account %s", fctx.id);
+            }
+            else {
+                acme->acct_key = NULL;
+            }
+        }
+    }
+    
+    /* If we still have no key, generate a new one */
+    if (!acme->acct_key) {
+        spec.type = MD_PKEY_TYPE_RSA;
+        spec.params.rsa.bits = MD_ACME_ACCT_PKEY_BITS;
+        
+        if (APR_SUCCESS != (rv = md_pkey_gen(&pkey, acme->p, &spec))) goto out;
+        acme->acct_key = pkey;
+        md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, rv, p, "created new account key");
+    }
+    
+    if (APR_SUCCESS != (rv = acct_make(&acme->acct,  p, acme->url, md->contacts))) goto out;
+    rv = md_acme_POST_new_account(acme,  on_init_acct_new, acct_upd, NULL, NULL, &ctx);
+    if (APR_SUCCESS == rv) {
+        md_log_perror(MD_LOG_MARK, MD_LOG_INFO, 0, p, 
+                      "registered new account %s", acme->acct->url);
+    }
+
+out:    
+    if (APR_SUCCESS != rv && acme->acct) {
+        acme->acct = NULL;
+    }
+    return rv;
+}
+
+/**************************************************************************************************/
+/* Deactivate the account */
+
+static apr_status_t on_init_acct_del(md_acme_req_t *req, void *baton)
+{
+    md_json_t *jpayload;
+
+    (void)baton;
+    jpayload = md_json_create(req->p);
+    md_json_sets("deactivated", jpayload, MD_KEY_STATUS, NULL);
+    return md_acme_req_body_init(req, jpayload);
+} 
+
+apr_status_t md_acme_acct_deactivate(md_acme_t *acme, apr_pool_t *p)
+{
+    md_acme_acct_t *acct = acme->acct;
+    acct_ctx_t ctx;
+    
+    (void)p;
+    if (!acct) {
+        return APR_EINVAL;
+    }
+    md_log_perror(MD_LOG_MARK, MD_LOG_DEBUG, 0, acme->p, "delete account %s from %s", 
+                  acct->url, acct->ca_url);
+    memset(&ctx, 0, sizeof(ctx));
+    ctx.acme = acme;
+    ctx.p = p;
+    return md_acme_POST(acme, acct->url, on_init_acct_del, acct_upd, NULL, NULL, &ctx);
+}
+
+/**************************************************************************************************/
+/* terms-of-service */
+
+static apr_status_t on_init_agree_tos(md_acme_req_t *req, void *baton)
+{
+    acct_ctx_t *ctx = baton;
+    md_json_t *jpayload;
+
+    jpayload = md_json_create(req->p);
+    if (ctx->acme->acct->agreement) {
+        md_json_setb(1, jpayload, "termsOfServiceAgreed", NULL);
+    }
+    return md_acme_req_body_init(req, jpayload);
+} 
+
+apr_status_t md_acme_agree(md_acme_t *acme, apr_pool_t *p, const char *agreement)
+{
+    acct_ctx_t ctx;
+    
+    acme->acct->agreement = agreement;
+    if (!strcmp("accepted", agreement) && acme->ca_agreement) {
+        acme->acct->agreement = acme->ca_agreement;
+    }
+    
+    memset(&ctx, 0, sizeof(ctx));
+    ctx.acme = acme;
+    ctx.p = p;
+    return md_acme_POST(acme, acme->acct->url, on_init_agree_tos, acct_upd, NULL, NULL, &ctx);
+}
+
+apr_status_t md_acme_check_agreement(md_acme_t *acme, apr_pool_t *p, 
+                                     const char *agreement, const char **prequired)
+{
+    apr_status_t rv = APR_SUCCESS;
+    
+    /* We used to really check if the account agreement and the one indicated in meta
+     * are the very same. However, LE is happy if the account has agreed to a ToS in 
+     * the past and does not require a renewed acceptance.
+     */
+    *prequired = NULL;
+    if (!acme->acct->agreement && acme->ca_agreement) {
+        if (agreement) {
+            rv = md_acme_agree(acme, p, acme->ca_agreement);
+        }
+        else {
+            *prequired = acme->ca_agreement;
+            rv = APR_INCOMPLETE;
+        }
+    }
+    return rv;
+}