The branch master has been updated
via 0e83981d61fc435f42d4bb4d774272b69556b7bc (commit)
from 48b5352212d8c68f7fd071ca9f38822b7e954c5a (commit)
- Log -----------------------------------------------------------------
commit 0e83981d61fc435f42d4bb4d774272b69556b7bc
Author: Diego Santa Cruz <[email protected]>
Date: Tue May 16 16:05:19 2017 +0200
Fix srp app missing NULL termination with password callback
The password_callback() function does not necessarily NULL terminate
the password buffer, the caller must use the returned length but the
srp app uses this function as if it was doing NULL termination.
This made the -passin and -passout options of "openssl srp"
fail inexpicably and randomly or even crash.
Fixed by enlarging the buffer by one, so that the maximum password length
remains unchanged, and adding NULL termination upon return.
[Rearrange code for coding style compliance in process.]
Reviewed-by: Matt Caswell <[email protected]>
Reviewed-by: Andy Polyakov <[email protected]>
(Merged from https://github.com/openssl/openssl/pull/3475)
-----------------------------------------------------------------------
Summary of changes:
apps/srp.c | 42 ++++++++++++++++++++++++------------------
1 file changed, 24 insertions(+), 18 deletions(-)
diff --git a/apps/srp.c b/apps/srp.c
index b14530f..3b19f86 100644
--- a/apps/srp.c
+++ b/apps/srp.c
@@ -119,32 +119,35 @@ static char *srp_verify_user(const char *user, const char
*srp_verifier,
char *srp_usersalt, const char *g, const char *N,
const char *passin, int verbose)
{
- char password[1024];
+ char password[1025];
PW_CB_DATA cb_tmp;
char *verifier = NULL;
char *gNid = NULL;
+ int len;
cb_tmp.prompt_info = user;
cb_tmp.password = passin;
- if (password_callback(password, sizeof(password), 0, &cb_tmp) > 0) {
+ len = password_callback(password, sizeof(password)-1, 0, &cb_tmp);
+ if (len > 0) {
+ password[len] = 0;
if (verbose)
BIO_printf(bio_err,
"Validating\n user=\"%s\"\n srp_verifier=\"%s\"\n
srp_usersalt=\"%s\"\n g=\"%s\"\n N=\"%s\"\n",
user, srp_verifier, srp_usersalt, g, N);
- BIO_printf(bio_err, "Pass %s\n", password);
+ if (verbose > 1)
+ BIO_printf(bio_err, "Pass %s\n", password);
OPENSSL_assert(srp_usersalt != NULL);
- if (!
- (gNid =
- SRP_create_verifier(user, password, &srp_usersalt, &verifier, N,
- g))) {
+ if (!(gNid = SRP_create_verifier(user, password, &srp_usersalt,
+ &verifier, N, g)) ) {
BIO_printf(bio_err, "Internal error validating SRP verifier\n");
} else {
if (strcmp(verifier, srp_verifier))
gNid = NULL;
OPENSSL_free(verifier);
}
+ OPENSSL_cleanse(password, len);
}
return gNid;
}
@@ -153,27 +156,30 @@ static char *srp_create_user(char *user, char
**srp_verifier,
char **srp_usersalt, char *g, char *N,
char *passout, int verbose)
{
- char password[1024];
+ char password[1025];
PW_CB_DATA cb_tmp;
char *gNid = NULL;
char *salt = NULL;
+ int len;
cb_tmp.prompt_info = user;
cb_tmp.password = passout;
- if (password_callback(password, sizeof(password), 1, &cb_tmp) > 0) {
+ len = password_callback(password, sizeof(password)-1, 1, &cb_tmp);
+ if (len > 0) {
+ password[len] = 0;
if (verbose)
BIO_printf(bio_err, "Creating\n user=\"%s\"\n g=\"%s\"\n
N=\"%s\"\n",
user, g, N);
- if (!
- (gNid =
- SRP_create_verifier(user, password, &salt, srp_verifier, N,
- g))) {
+ if (!(gNid = SRP_create_verifier(user, password, &salt,
+ srp_verifier, N, g)) ) {
BIO_printf(bio_err, "Internal error creating SRP verifier\n");
- } else
+ } else {
*srp_usersalt = salt;
+ }
+ OPENSSL_cleanse(password, len);
if (verbose > 1)
- BIO_printf(bio_err, "gNid=%s salt =\"%s\"\n verifier =\"%s\"\n",
gNid,
- salt, *srp_verifier);
+ BIO_printf(bio_err, "gNid=%s salt =\"%s\"\n verifier =\"%s\"\n",
+ gNid, salt, *srp_verifier);
}
return gNid;
@@ -251,7 +257,7 @@ int srp_main(int argc, char **argv)
case OPT_LIST:
if (mode != OPT_ERR) {
BIO_printf(bio_err,
- "%s: Only one of -add/delete-modify/-list\n",
+ "%s: Only one of -add/-delete/-modify/-list\n",
prog);
goto opthelp;
}
@@ -293,7 +299,7 @@ int srp_main(int argc, char **argv)
"Need at least one user for options -add, -delete, -modify.
\n");
goto opthelp;
}
- if ((passin || passout) && argc != 1) {
+ if ((passinarg || passoutarg) && argc != 1) {
BIO_printf(bio_err,
"-passin, -passout arguments only valid with one user.\n");
goto opthelp;
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