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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
This commit is contained in:
Matt Johnston 2011-12-04 05:31:25 +08:00
parent 52a466b8af
commit aec23e5f79
4 changed files with 19 additions and 11 deletions
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1
auth.h
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@ -133,7 +133,6 @@ struct PubKeyOptions {
int no_pty_flag; int no_pty_flag;
/* "command=" option. */ /* "command=" option. */
unsigned char * forced_command; unsigned char * forced_command;
unsigned char * original_command;
}; };
#endif #endif

4
chansession.h
View File

@ -69,6 +69,10 @@ struct ChanSess {
char * agentfile; char * agentfile;
char * agentdir; char * agentdir;
#endif #endif
#ifdef ENABLE_SVR_PUBKEY_OPTIONS
char *original_command;
#endif
}; };
struct ChildPid { struct ChildPid {

13
svr-authpubkeyoptions.c
View File

@ -92,14 +92,15 @@ int svr_pubkey_allows_pty() {
* by any 'command' public key option. */ * by any 'command' public key option. */
void svr_pubkey_set_forced_command(struct ChanSess *chansess) { void svr_pubkey_set_forced_command(struct ChanSess *chansess) {
if (ses.authstate.pubkey_options) { if (ses.authstate.pubkey_options) {
ses.authstate.pubkey_options->original_command = chansess->cmd; if (chansess->cmd) {
if (!chansess->cmd) /* original_command takes ownership */
{ chansess->original_command = chansess->cmd;
ses.authstate.pubkey_options->original_command = m_strdup(""); } else {
chansess->original_command = m_strdup("");
} }
chansess->cmd = ses.authstate.pubkey_options->forced_command; chansess->cmd = m_strdup(ses.authstate.pubkey_options->forced_command);
#ifdef LOG_COMMANDS #ifdef LOG_COMMANDS
dropbear_log(LOG_INFO, "Command forced to '%s'", ses.authstate.pubkey_options->original_command); dropbear_log(LOG_INFO, "Command forced to '%s'", chansess->original_command);
#endif #endif
} }
} }

12
svr-chansession.c
View File

@ -217,6 +217,8 @@ static int newchansess(struct Channel *channel) {
struct ChanSess *chansess; struct ChanSess *chansess;
TRACE(("new chansess %p", channel))
dropbear_assert(channel->typedata == NULL); dropbear_assert(channel->typedata == NULL);
chansess = (struct ChanSess*)m_malloc(sizeof(struct ChanSess)); chansess = (struct ChanSess*)m_malloc(sizeof(struct ChanSess));
@ -279,6 +281,10 @@ static void closechansess(struct Channel *channel) {
m_free(chansess->cmd); m_free(chansess->cmd);
m_free(chansess->term); m_free(chansess->term);
#ifdef ENABLE_SVR_PUBKEY_OPTIONS
m_free(chansess->original_command);
#endif
if (chansess->tty) { if (chansess->tty) {
/* write the utmp/wtmp login record */ /* write the utmp/wtmp login record */
li = chansess_login_alloc(chansess); li = chansess_login_alloc(chansess);
@ -924,10 +930,8 @@ static void execchild(void *user_data) {
} }
#ifdef ENABLE_SVR_PUBKEY_OPTIONS #ifdef ENABLE_SVR_PUBKEY_OPTIONS
if (ses.authstate.pubkey_options && if (chansess->original_command) {
ses.authstate.pubkey_options->original_command) { addnewvar("SSH_ORIGINAL_COMMAND", chansess->original_command);
addnewvar("SSH_ORIGINAL_COMMAND",
ses.authstate.pubkey_options->original_command);
} }
#endif #endif