mirror of
https://git.FreeBSD.org/ports.git
synced 2024-11-04 22:33:27 +00:00
1083bcdc4f
this release is mostly the support for lots of ssh2. Note that SSH2 is not fully supported here yet, but it's mostly there; see README.openssh2.
118 lines
3.4 KiB
Plaintext
118 lines
3.4 KiB
Plaintext
--- sshd.c.orig Thu Apr 20 17:11:24 2000
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+++ sshd.c Thu Apr 20 17:17:12 2000
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@@ -48,6 +48,13 @@
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int deny_severity = LOG_WARNING;
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#endif /* LIBWRAP */
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+#ifdef __FreeBSD__
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+#include <libutil.h>
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+#include <poll.h>
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+#include <syslog.h>
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+#include <time.h>
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+#endif /* __FreeBSD__ */
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+
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#ifndef O_NOCTTY
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#define O_NOCTTY 0
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#endif
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@@ -128,6 +135,32 @@
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/* session identifier, used by RSA-auth */
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unsigned char session_id[16];
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+/* These are used to implement connections_per_period. */
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+struct magic_connection {
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+ struct timeval connections_begin;
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+ unsigned int connections_this_period;
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+} *magic_connections;
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+/* Magic number, too! TODO: this doesn't have to be static. */
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+const size_t MAGIC_CONNECTIONS_SIZE = 1;
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+
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+static __inline int
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+magic_hash(struct sockaddr_storage *sa) {
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+
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+ return 0;
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+}
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+
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+static __inline struct timeval
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+timevaldiff(struct timeval *tv1, struct timeval *tv2) {
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+ struct timeval diff;
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+ int carry;
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+
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+ carry = tv1->tv_usec > tv2->tv_usec;
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+ diff.tv_sec = tv2->tv_sec - tv1->tv_sec - (carry ? 0 : 1);
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+ diff.tv_usec = tv2->tv_usec - tv1->tv_usec + (carry ? 1000000 : 0);
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+
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+ return diff;
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+}
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+
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/* Prototypes for various functions defined later in this file. */
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void do_ssh1_kex();
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void do_ssh2_kex();
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@@ -395,6 +428,7 @@
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int opt, sock_in = 0, sock_out = 0, newsock, i, fdsetsz, on = 1;
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pid_t pid;
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socklen_t fromlen;
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+ int connections_per_period_exceeded = 0;
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int silentrsa = 0;
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fd_set *fdset;
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struct sockaddr_storage from;
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@@ -709,6 +743,12 @@
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fdsetsz = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
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fdset = (fd_set *)xmalloc(fdsetsz);
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+ /* Initialize the magic_connections table. It's magical! */
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+ magic_connections = calloc(MAGIC_CONNECTIONS_SIZE,
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+ sizeof(struct magic_connection));
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+ if (magic_connections == NULL)
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+ fatal("calloc: %s", strerror(errno));
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+
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/*
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* Stay listening for connections until the system crashes or
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* the daemon is killed with a signal.
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@@ -740,9 +780,31 @@
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error("newsock del O_NONBLOCK: %s", strerror(errno));
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continue;
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}
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+ if (options.connections_per_period != 0) {
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+ struct timeval diff, connections_end;
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+ struct magic_connection *mc;
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+
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+ (void)gettimeofday(&connections_end, NULL);
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+ mc = &magic_connections[magic_hash(&from)];
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+ diff = timevaldiff(&mc->connections_begin, &connections_end);
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+ if (diff.tv_sec >= options.connections_period) {
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+ /*
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+ * Slide the window forward only after completely
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+ * leaving it.
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+ */
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+ mc->connections_begin = connections_end;
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+ mc->connections_this_period = 1;
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+ } else {
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+ if (++mc->connections_this_period >
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+ options.connections_per_period)
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+ connections_per_period_exceeded = 1;
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+ }
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+ }
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+
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/*
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- * Got connection. Fork a child to handle it, unless
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- * we are in debugging mode.
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+ * Got connection. Fork a child to handle it unless
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+ * we are in debugging mode or the maximum number of
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+ * connections per period has been exceeded.
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*/
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if (debug_flag) {
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/*
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@@ -756,6 +818,12 @@
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sock_out = newsock;
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pid = getpid();
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break;
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+ } else if (connections_per_period_exceeded) {
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+ log("Connection rate limit of %u/%us has been exceeded; "
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+ "dropping connection from %s.",
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+ options.connections_per_period, options.connections_period,
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+ ntop);
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+ connections_per_period_exceeded = 0;
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} else {
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/*
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* Normal production daemon. Fork, and have
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