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Blame SOURCES/kvm-block-ssh-Propagate-errors-through-check_host_key.patch

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From 6151164b6f33870c511a7f5f0f64356bb8fe2ff2 Mon Sep 17 00:00:00 2001
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From: Richard Jones <rjones@redhat.com>
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Date: Mon, 8 Jun 2015 11:56:56 +0200
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Subject: [PATCH 03/30] block/ssh: Propagate errors through check_host_key()
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Message-id: <1433764620-20506-3-git-send-email-rjones@redhat.com>
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Patchwork-id: 65479
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O-Subject: [RHEL-7.2 qemu-kvm PATCH 2/6] block/ssh: Propagate errors through check_host_key()
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Bugzilla: 1226683
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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From: Markus Armbruster <armbru@redhat.com>
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Upstream-status: 01c2b265fce921d6460e06f5af4dfb405119cbab
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block/ssh.c | 68 ++++++++++++++++++++++++++++++++++++++++++++-----------------
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 1 file changed, 49 insertions(+), 19 deletions(-)
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diff --git a/block/ssh.c b/block/ssh.c
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index 1f7c6ed..6ffcff1 100644
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--- a/block/ssh.c
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+++ b/block/ssh.c
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@@ -106,6 +106,31 @@ static void ssh_state_free(BDRVSSHState *s)
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     }
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 }
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+static void GCC_FMT_ATTR(3, 4)
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+session_error_setg(Error **errp, BDRVSSHState *s, const char *fs, ...)
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+{
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+    va_list args;
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+    char *msg;
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+
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+    va_start(args, fs);
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+    msg = g_strdup_vprintf(fs, args);
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+    va_end(args);
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+
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+    if (s->session) {
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+        char *ssh_err;
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+        int ssh_err_code;
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+
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+        /* This is not an errno.  See <libssh2.h>. */
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+        ssh_err_code = libssh2_session_last_error(s->session,
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+                                                  &ssh_err, NULL, 0);
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+        error_setg(errp, "%s: %s (libssh2 error code: %d)",
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+                   msg, ssh_err, ssh_err_code);
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+    } else {
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+        error_setg(errp, "%s", msg);
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+    }
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+    g_free(msg);
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+}
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+
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 /* Wrappers around error_report which make sure to dump as much
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  * information from libssh2 as possible.
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  */
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@@ -242,7 +267,7 @@ static void ssh_parse_filename(const char *filename, QDict *options,
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 }
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 static int check_host_key_knownhosts(BDRVSSHState *s,
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-                                     const char *host, int port)
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+                                     const char *host, int port, Error **errp)
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 {
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     const char *home;
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     char *knh_file = NULL;
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@@ -256,14 +281,15 @@ static int check_host_key_knownhosts(BDRVSSHState *s,
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     hostkey = libssh2_session_hostkey(s->session, &len, &type);
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     if (!hostkey) {
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         ret = -EINVAL;
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-        session_error_report(s, "failed to read remote host key");
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+        session_error_setg(errp, s, "failed to read remote host key");
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         goto out;
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     }
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     knh = libssh2_knownhost_init(s->session);
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     if (!knh) {
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         ret = -EINVAL;
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-        session_error_report(s, "failed to initialize known hosts support");
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+        session_error_setg(errp, s,
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+                           "failed to initialize known hosts support");
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         goto out;
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     }
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@@ -288,21 +314,23 @@ static int check_host_key_knownhosts(BDRVSSHState *s,
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         break;
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     case LIBSSH2_KNOWNHOST_CHECK_MISMATCH:
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         ret = -EINVAL;
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-        session_error_report(s, "host key does not match the one in known_hosts (found key %s)",
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-                             found->key);
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+        session_error_setg(errp, s,
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+                      "host key does not match the one in known_hosts"
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+                      " (found key %s)", found->key);
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         goto out;
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     case LIBSSH2_KNOWNHOST_CHECK_NOTFOUND:
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         ret = -EINVAL;
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-        session_error_report(s, "no host key was found in known_hosts");
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+        session_error_setg(errp, s, "no host key was found in known_hosts");
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         goto out;
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     case LIBSSH2_KNOWNHOST_CHECK_FAILURE:
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         ret = -EINVAL;
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-        session_error_report(s, "failure matching the host key with known_hosts");
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+        session_error_setg(errp, s,
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+                      "failure matching the host key with known_hosts");
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         goto out;
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     default:
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         ret = -EINVAL;
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-        session_error_report(s, "unknown error matching the host key with known_hosts (%d)",
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-                             r);
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+        session_error_setg(errp, s, "unknown error matching the host key"
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+                      " with known_hosts (%d)", r);
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         goto out;
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     }
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@@ -357,20 +385,20 @@ static int compare_fingerprint(const unsigned char *fingerprint, size_t len,
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 static int
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 check_host_key_hash(BDRVSSHState *s, const char *hash,
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-                    int hash_type, size_t fingerprint_len)
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+                    int hash_type, size_t fingerprint_len, Error **errp)
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 {
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     const char *fingerprint;
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     fingerprint = libssh2_hostkey_hash(s->session, hash_type);
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     if (!fingerprint) {
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-        session_error_report(s, "failed to read remote host key");
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+        session_error_setg(errp, s, "failed to read remote host key");
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         return -EINVAL;
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     }
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     if(compare_fingerprint((unsigned char *) fingerprint, fingerprint_len,
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                            hash) != 0) {
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-        error_report("remote host key does not match host_key_check '%s'",
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-                     hash);
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+        error_setg(errp, "remote host key does not match host_key_check '%s'",
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+                   hash);
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         return -EPERM;
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     }
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@@ -378,7 +406,7 @@ check_host_key_hash(BDRVSSHState *s, const char *hash,
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 }
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 static int check_host_key(BDRVSSHState *s, const char *host, int port,
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-                          const char *host_key_check)
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+                          const char *host_key_check, Error **errp)
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 {
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     /* host_key_check=no */
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     if (strcmp(host_key_check, "no") == 0) {
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@@ -388,21 +416,21 @@ static int check_host_key(BDRVSSHState *s, const char *host, int port,
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     /* host_key_check=md5:xx:yy:zz:... */
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     if (strncmp(host_key_check, "md5:", 4) == 0) {
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         return check_host_key_hash(s, &host_key_check[4],
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-                                   LIBSSH2_HOSTKEY_HASH_MD5, 16);
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+                                   LIBSSH2_HOSTKEY_HASH_MD5, 16, errp);
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     }
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     /* host_key_check=sha1:xx:yy:zz:... */
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     if (strncmp(host_key_check, "sha1:", 5) == 0) {
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         return check_host_key_hash(s, &host_key_check[5],
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-                                   LIBSSH2_HOSTKEY_HASH_SHA1, 20);
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+                                   LIBSSH2_HOSTKEY_HASH_SHA1, 20, errp);
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     }
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     /* host_key_check=yes */
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     if (strcmp(host_key_check, "yes") == 0) {
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-        return check_host_key_knownhosts(s, host, port);
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+        return check_host_key_knownhosts(s, host, port, errp);
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     }
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-    error_report("unknown host_key_check setting (%s)", host_key_check);
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+    error_setg(errp, "unknown host_key_check setting (%s)", host_key_check);
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     return -EINVAL;
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 }
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@@ -541,8 +569,10 @@ static int connect_to_ssh(BDRVSSHState *s, QDict *options,
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     }
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     /* Check the remote host's key against known_hosts. */
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-    ret = check_host_key(s, host, port, host_key_check);
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+    ret = check_host_key(s, host, port, host_key_check, &err;;
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     if (ret < 0) {
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+        qerror_report_err(err);
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+        error_free(err);
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         goto err;
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     }
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-- 
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1.8.3.1
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