SSH: Save SSH host name aliases

6 files changed, 119 insertions, 40 deletions

diff --git a/src/db/sysdb_ssh.c b/src/db/sysdb_ssh.c
index c2ea35b03..d83ad9669 100644
--- a/src/db/sysdb_ssh.c
+++ b/src/db/sysdb_ssh.c
@@ -24,12 +24,19 @@
 #include "db/sysdb_private.h"
 
 errno_t
-sysdb_save_ssh_host(struct sysdb_ctx *sysdb_ctx,
-                    const char *name,
-                    struct sysdb_attrs *attrs)
+sysdb_store_ssh_host(struct sysdb_ctx *sysdb,
+                     const char *name,
+                     const char *alias,
+                     struct sysdb_attrs *attrs)
 {
-    errno_t ret;
     TALLOC_CTX *tmp_ctx;
+    errno_t ret;
+    struct ldb_message **hosts;
+    size_t num_hosts;
+    struct ldb_message_element *el;
+    unsigned int i;
+    const char *search_attrs[] = { SYSDB_NAME_ALIAS, NULL };
+    bool in_transaction = false;
 
     DEBUG(SSSDBG_TRACE_FUNC, ("Adding host %s\n", name));
 
@@ -46,25 +53,89 @@ sysdb_save_ssh_host(struct sysdb_ctx *sysdb_ctx,
         }
     }
 
-    ret = sysdb_store_custom(sysdb_ctx, name, SSH_HOSTS_SUBDIR, attrs);
+    ret = sysdb_transaction_start(sysdb);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_CRIT_FAILURE,
+              ("Failed to start update transaction\n"));
+        goto done;
+    }
+
+    in_transaction = true;
+
+    ret = sysdb_search_ssh_hosts(tmp_ctx, sysdb, name, search_attrs,
+                                 &hosts, &num_hosts);
+    if (ret != EOK && ret != ENOENT) {
+        goto done;
+    }
+
+    if (num_hosts > 1) {
+        ret = EINVAL;
+        goto done;
+    }
+
+    ret = sysdb_delete_ssh_host(sysdb, name);
+    if (ret != EOK && ret != ENOENT) {
+        goto done;
+    }
+
+    if (num_hosts == 1) {
+        el = ldb_msg_find_element(hosts[0], SYSDB_NAME_ALIAS);
+
+        if (el) {
+            for (i = 0; i < el->num_values; i++) {
+                if (alias && strcmp((char *)el->values[i].data, alias) == 0) {
+                    alias = NULL;
+                }
+
+                ret = sysdb_attrs_add_val(attrs,
+                                          SYSDB_NAME_ALIAS, &el->values[i]);
+                if (ret != EOK) {
+                    DEBUG(SSSDBG_OP_FAILURE, ("Could not add name alias\n"));
+                    goto done;
+                }
+            }
+        }
+    }
+
+    if (alias) {
+        ret = sysdb_attrs_add_string(attrs, SYSDB_NAME_ALIAS, alias);
+        if (ret != EOK) {
+            DEBUG(SSSDBG_OP_FAILURE, ("Could not add name alias\n"));
+            goto done;
+        }
+    }
+
+    ret = sysdb_store_custom(sysdb, name, SSH_HOSTS_SUBDIR, attrs);
     if (ret != EOK) {
         DEBUG(SSSDBG_OP_FAILURE, ("sysdb_store_custom failed [%d]: %s\n",
               ret, strerror(ret)));
         goto done;
     }
 
+    ret = sysdb_transaction_commit(sysdb);
+    if (ret != EOK) {
+        goto done;
+    }
+
+    in_transaction = false;
     ret = EOK;
+
 done:
+    if (in_transaction) {
+        sysdb_transaction_cancel(sysdb);
+    }
+
     talloc_free(tmp_ctx);
+
     return ret;
 }
 
 errno_t
-sysdb_delete_ssh_host(struct sysdb_ctx *sysdb_ctx,
+sysdb_delete_ssh_host(struct sysdb_ctx *sysdb,
                       const char *name)
 {
     DEBUG(SSSDBG_TRACE_FUNC, ("Deleting host %s\n", name));
-    return sysdb_delete_custom(sysdb_ctx, name, SSH_HOSTS_SUBDIR);
+    return sysdb_delete_custom(sysdb, name, SSH_HOSTS_SUBDIR);
 }
 
 errno_t
diff --git a/src/db/sysdb_ssh.h b/src/db/sysdb_ssh.h
index f9d8d6eca..3136dcc07 100644
--- a/src/db/sysdb_ssh.h
+++ b/src/db/sysdb_ssh.h
@@ -26,12 +26,13 @@
 #define SSH_HOSTS_SUBDIR "ssh_hosts"
 
 errno_t
-sysdb_save_ssh_host(struct sysdb_ctx *sysdb_ctx,
-                    const char *name,
-                    struct sysdb_attrs *attrs);
+sysdb_store_ssh_host(struct sysdb_ctx *sysdb,
+                     const char *name,
+                     const char *alias,
+                     struct sysdb_attrs *attrs);
 
 errno_t
-sysdb_delete_ssh_host(struct sysdb_ctx *sysdb_ctx,
+sysdb_delete_ssh_host(struct sysdb_ctx *sysdb,
                       const char *name);
 
 errno_t
diff --git a/src/providers/data_provider_be.c b/src/providers/data_provider_be.c
index 2cea1933c..7e27ceacd 100644
--- a/src/providers/data_provider_be.c
+++ b/src/providers/data_provider_be.c
@@ -1182,7 +1182,9 @@ static int be_host_handler(DBusMessage *message, struct sbus_connection *conn)
     if (filter) {
         if (strncmp(filter, "name=", 5) == 0) {
             req->filter_type = BE_FILTER_NAME;
-            req->filter_value = &filter[5];
+            ret = split_service_name_filter(req, &filter[5],
+                                            &req->filter_value,
+                                            &req->extra_value);
         } else {
             err_maj = DP_ERR_FATAL;
             err_min = EINVAL;
diff --git a/src/providers/ipa/ipa_hostid.c b/src/providers/ipa/ipa_hostid.c
index 873cc5296..8ab24fe5a 100644
--- a/src/providers/ipa/ipa_hostid.c
+++ b/src/providers/ipa/ipa_hostid.c
@@ -33,6 +33,7 @@ struct hosts_get_state {
     struct sysdb_ctx *sysdb;
     struct sss_domain_info *domain;
     const char *name;
+    const char *alias;
     const char **attrs;
 
     size_t count;
@@ -45,6 +46,7 @@ hosts_get_send(TALLOC_CTX *memctx,
                struct tevent_context *ev,
                struct ipa_hostid_ctx *hostid_ctx,
                const char *name,
+               const char *alias,
                int attrs_type);
 static errno_t
 hosts_get_recv(struct tevent_req *req,
@@ -83,7 +85,7 @@ ipa_host_info_handler(struct be_req *breq)
     }
 
     req = hosts_get_send(breq, breq->be_ctx->ev, hostid_ctx,
-                         ar->filter_value,
+                         ar->filter_value, ar->extra_value,
                          ar->attr_type);
     if (!req) {
         ret = ENOMEM;
@@ -149,6 +151,7 @@ hosts_get_send(TALLOC_CTX *memctx,
                struct tevent_context *ev,
                struct ipa_hostid_ctx *hostid_ctx,
                const char *name,
+               const char *alias,
                int attrs_type)
 {
     struct tevent_req *req;
@@ -175,6 +178,7 @@ hosts_get_send(TALLOC_CTX *memctx,
     state->sysdb = ctx->be->sysdb;
     state->domain = ctx->be->domain;
     state->name = name;
+    state->alias = alias;
 
     /* TODO: handle attrs_type */
     ret = build_attrs_from_map(state, ctx->opts->host_map,
@@ -253,7 +257,6 @@ hosts_get_done(struct tevent_req *subreq)
                                                     struct hosts_get_state);
     int dp_error = DP_ERR_FATAL;
     errno_t ret;
-    bool in_transaction = false;
 
     ret = ipa_host_info_recv(subreq, state,
                              &state->count, &state->hosts,
@@ -274,20 +277,6 @@ hosts_get_done(struct tevent_req *subreq)
         goto done;
     }
 
-    ret = sysdb_transaction_start(state->sysdb);
-    if (ret != EOK) {
-        DEBUG(SSSDBG_CRIT_FAILURE,
-              ("Failed to start update transaction\n"));
-        goto done;
-    }
-
-    in_transaction = true;
-
-    ret = sysdb_delete_ssh_host(state->sysdb, state->name);
-    if (ret != EOK && ret != ENOENT) {
-        goto done;
-    }
-
     if (state->count == 0) {
         DEBUG(SSSDBG_CRIT_FAILURE,
               ("No host with name [%s] found.\n", state->name));
@@ -302,18 +291,12 @@ hosts_get_done(struct tevent_req *subreq)
         goto done;
     }
 
-    ret = sysdb_save_ssh_host(state->sysdb,
-                              state->name, state->hosts[0]);
+    ret = sysdb_store_ssh_host(state->sysdb, state->name, state->alias,
+                               state->hosts[0]);
     if (ret != EOK) {
         goto done;
     }
 
-    ret = sysdb_transaction_commit(state->sysdb);
-    if (ret != EOK) {
-        goto done;
-    }
-
-    in_transaction = false;
     dp_error = DP_ERR_OK;
 
 done:
@@ -321,9 +304,6 @@ done:
     if (ret == EOK) {
         tevent_req_done(req);
     } else {
-        if (in_transaction) {
-            sysdb_transaction_cancel(state->sysdb);
-        }
         tevent_req_error(req, ret);
     }
 }
diff --git a/src/responder/ssh/sshsrv_cmd.c b/src/responder/ssh/sshsrv_cmd.c
index 0a182f310..da6a4540b 100644
--- a/src/responder/ssh/sshsrv_cmd.c
+++ b/src/responder/ssh/sshsrv_cmd.c
@@ -22,6 +22,7 @@
 
 #include <talloc.h>
 #include <string.h>
+#include <netdb.h>
 
 #include "util/util.h"
 #include "util/crypto/sss_crypto.h"
@@ -90,6 +91,8 @@ sss_ssh_cmd_get_host_pubkeys(struct cli_ctx *cctx)
 {
     struct ssh_cmd_ctx *cmd_ctx;
     errno_t ret;
+    struct addrinfo ai_hint;
+    struct addrinfo *ai = NULL;
 
     cmd_ctx = talloc_zero(cctx, struct ssh_cmd_ctx);
     if (!cmd_ctx) {
@@ -107,6 +110,27 @@ sss_ssh_cmd_get_host_pubkeys(struct cli_ctx *cctx)
           ("Requesting SSH host public keys for [%s] from [%s]\n",
            cmd_ctx->name, cmd_ctx->domname ? cmd_ctx->domname : "<ALL>"));
 
+    /* canonicalize host name */
+    memset(&ai_hint, 0, sizeof(struct addrinfo));
+    ai_hint.ai_flags = AI_CANONNAME;
+
+    ret = getaddrinfo(cmd_ctx->name, NULL, &ai_hint, &ai);
+    if (!ret) {
+        if (strcmp(cmd_ctx->name, ai[0].ai_canonname) != 0) {
+            cmd_ctx->alias = cmd_ctx->name;
+            cmd_ctx->name = talloc_strdup(cmd_ctx, ai[0].ai_canonname);
+            if (!cmd_ctx->name) {
+                ret = ENOMEM;
+                goto done;
+            }
+        }
+    } else {
+        DEBUG(SSSDBG_OP_FAILURE,
+              ("getaddrinfo() failed (%d): %s\n", ret, gai_strerror(ret)));
+    }
+
+    freeaddrinfo(ai);
+
     if (cmd_ctx->domname) {
         cmd_ctx->domain = responder_get_domain(cctx->rctx->domains,
                                                cmd_ctx->domname);
@@ -312,7 +336,7 @@ ssh_host_pubkeys_search(struct ssh_cmd_ctx *cmd_ctx)
     if (NEED_CHECK_PROVIDER(cmd_ctx->domain->provider)) {
         req = sss_dp_get_account_send(cmd_ctx, cmd_ctx->cctx->rctx,
                                       cmd_ctx->domain, false, SSS_DP_HOST,
-                                      cmd_ctx->name, 0, NULL);
+                                      cmd_ctx->name, 0, cmd_ctx->alias);
         if (!req) {
             DEBUG(SSSDBG_CRIT_FAILURE,
                   ("Out of memory sending data provider request\n"));
diff --git a/src/responder/ssh/sshsrv_private.h b/src/responder/ssh/sshsrv_private.h
index 26ed6b92e..ffe88eb35 100644
--- a/src/responder/ssh/sshsrv_private.h
+++ b/src/responder/ssh/sshsrv_private.h
@@ -34,6 +34,7 @@ struct ssh_cmd_ctx {
     struct cli_ctx *cctx;
     enum sss_dp_acct_type type;
     char *name;
+    char *alias;
     char *domname;
 
     struct sss_domain_info *domain;