92 lines
2.6 KiB
Diff
92 lines
2.6 KiB
Diff
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# HG changeset patch
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# User Matt Johnston <matt@ucc.asn.au>
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# Date 1322947885 -28800
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# Node ID 818108bf7749bfecd4715a30e2583aac9dbe25e8
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# Parent 5e8d84f3ee7256d054ecf7e9f248765ccaa7f24f
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- Fix use-after-free if multiple command requests were sent. Move
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the original_command into chansess struct since that makes more sense
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--- a/auth.h
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+++ b/auth.h
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@@ -133,7 +133,6 @@ struct PubKeyOptions {
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int no_pty_flag;
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/* "command=" option. */
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unsigned char * forced_command;
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- unsigned char * original_command;
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};
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#endif
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--- a/chansession.h
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+++ b/chansession.h
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@@ -69,6 +69,10 @@ struct ChanSess {
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char * agentfile;
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char * agentdir;
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#endif
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+
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+#ifdef ENABLE_SVR_PUBKEY_OPTIONS
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+ char *original_command;
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+#endif
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};
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struct ChildPid {
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--- a/svr-authpubkeyoptions.c
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+++ b/svr-authpubkeyoptions.c
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@@ -92,14 +92,15 @@ int svr_pubkey_allows_pty() {
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* by any 'command' public key option. */
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void svr_pubkey_set_forced_command(struct ChanSess *chansess) {
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if (ses.authstate.pubkey_options) {
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- ses.authstate.pubkey_options->original_command = chansess->cmd;
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- if (!chansess->cmd)
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- {
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- ses.authstate.pubkey_options->original_command = m_strdup("");
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+ if (chansess->cmd) {
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+ /* original_command takes ownership */
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+ chansess->original_command = chansess->cmd;
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+ } else {
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+ chansess->original_command = m_strdup("");
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}
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- chansess->cmd = ses.authstate.pubkey_options->forced_command;
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+ chansess->cmd = m_strdup(ses.authstate.pubkey_options->forced_command);
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#ifdef LOG_COMMANDS
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- dropbear_log(LOG_INFO, "Command forced to '%s'", ses.authstate.pubkey_options->original_command);
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+ dropbear_log(LOG_INFO, "Command forced to '%s'", chansess->original_command);
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#endif
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}
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}
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--- a/svr-chansession.c
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+++ b/svr-chansession.c
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@@ -217,6 +217,8 @@ static int newchansess(struct Channel *c
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struct ChanSess *chansess;
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+ TRACE(("new chansess %p", channel))
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+
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dropbear_assert(channel->typedata == NULL);
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chansess = (struct ChanSess*)m_malloc(sizeof(struct ChanSess));
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@@ -279,6 +281,10 @@ static void closechansess(struct Channel
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m_free(chansess->cmd);
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m_free(chansess->term);
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+#ifdef ENABLE_SVR_PUBKEY_OPTIONS
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+ m_free(chansess->original_command);
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+#endif
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+
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if (chansess->tty) {
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/* write the utmp/wtmp login record */
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li = chansess_login_alloc(chansess);
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@@ -924,10 +930,8 @@ static void execchild(void *user_data) {
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}
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#ifdef ENABLE_SVR_PUBKEY_OPTIONS
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- if (ses.authstate.pubkey_options &&
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- ses.authstate.pubkey_options->original_command) {
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- addnewvar("SSH_ORIGINAL_COMMAND",
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- ses.authstate.pubkey_options->original_command);
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+ if (chansess->original_command) {
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+ addnewvar("SSH_ORIGINAL_COMMAND", chansess->original_command);
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}
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#endif
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