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stream-ssl: Only re-read certificates and keys if they change.

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Commit 415f6c0b1 "stream-ssl: Make no-op reconfiguration cheap" caused
ovsdb-server to re-read its certificates and keys every 60 seconds just
in case they changed.  However, doing this causes OpenSSL to drop its
connections.  This commit solves the problem by making stream-ssl re-read
certificates and keys only if the files changed.

Bug #2535.
Reported-by: Ram Jothikumar <rjothikumar@nicira.com>
This commit is contained in:
Ben Pfaff
2010-03-24 13:15:41 -07:00
parent 5c43922c13
commit 9cb0788702
2 changed files with 40 additions and 10 deletions
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48
lib/stream-ssl.c
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@@ -133,8 +133,7 @@ static SSL_CTX *ctx;
struct ssl_config_file {
bool read; /* Whether the file was successfully read. */
char *file_name; /* Configured file name, if any. */
long long int next_retry; /* If 'file_name' but not 'read', next time to
* retry reading. */
struct timespec mtime; /* File mtime as of last time we read it. */
};
/* SSL configuration files. */
@@ -335,9 +334,10 @@ do_ca_cert_bootstrap(struct stream *stream)
fd = open(ca_cert.file_name, O_CREAT | O_EXCL | O_WRONLY, 0444);
if (fd < 0) {
if (errno == EEXIST) {
VLOG_INFO("reading CA cert %s created by another process",
VLOG_INFO("CA cert %s created by another process",
ca_cert.file_name);
stream_ssl_set_ca_cert_file__(ca_cert.file_name, true);
/* We'll read it the next time around the main loop because
* update_ssl_config() will see that it now exists. */
return EPROTO;
} else {
VLOG_ERR("could not bootstrap CA cert: creating %s failed: %s",
@@ -910,18 +910,46 @@ stream_ssl_is_configured(void)
return private_key.file_name || certificate.file_name || ca_cert.file_name;
}
static void
get_mtime(const char *file_name, struct timespec *mtime)
{
struct stat s;
if (!stat(file_name, &s)) {
mtime->tv_sec = s.st_mtime;
#if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
mtime->tv_nsec = s.st_mtim.tv_nsec;
#elif HAVE_STRUCT_STAT_ST_MTIMENSEC
mtime->tv_nsec = s.st_mtimensec;
#else
mtime->tv_nsec = 0;
#endif
} else {
mtime->tv_sec = mtime->tv_nsec = 0;
}
}
static bool
update_ssl_config(struct ssl_config_file *config, const char *file_name)
{
if (ssl_init()
|| !file_name
|| (config->file_name
&& !strcmp(config->file_name, file_name)
&& time_msec() < config->next_retry)) {
struct timespec mtime;
if (ssl_init() || !file_name) {
return false;
}
config->next_retry = time_msec() + 60 * 1000;
/* If the file name hasn't changed and neither has the file contents, stop
* here. */
get_mtime(file_name, &mtime);
if (config->file_name
&& !strcmp(config->file_name, file_name)
&& mtime.tv_sec == config->mtime.tv_sec
&& mtime.tv_nsec == config->mtime.tv_nsec) {
return false;
}
config->mtime = mtime;
free(config->file_name);
config->file_name = xstrdup(file_name);
return true;