c06fb25d1f
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107 lines
3.7 KiB
Diff
107 lines
3.7 KiB
Diff
--- a/src/svr-authpubkey.c
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+++ b/src/svr-authpubkey.c
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@@ -78,6 +78,13 @@ static void send_msg_userauth_pk_ok(cons
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const unsigned char* keyblob, unsigned int keybloblen);
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static int checkfileperm(char * filename);
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+static const char * const global_authkeys_dir = "/etc/dropbear";
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+static const int n_global_authkeys_dir = 14; /* + 1 extra byte */
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+static const char * const user_authkeys_dir = ".ssh";
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+static const int n_user_authkeys_dir = 5; /* + 1 extra byte */
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+static const char * const authkeys_file = "authorized_keys";
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+static const int n_authkeys_file = 16; /* + 1 extra byte */
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+
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/* process a pubkey auth request, sending success or failure message as
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* appropriate */
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void svr_auth_pubkey(int valid_user) {
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@@ -462,14 +469,21 @@ static int checkpubkey(const char* keyal
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if (checkpubkeyperms() == DROPBEAR_FAILURE) {
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TRACE(("bad authorized_keys permissions, or file doesn't exist"))
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} else {
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- /* we don't need to check pw and pw_dir for validity, since
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- * its been done in checkpubkeyperms. */
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- len = strlen(ses.authstate.pw_dir);
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- /* allocate max required pathname storage,
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- * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
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- filename = m_malloc(len + 22);
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- snprintf(filename, len + 22, "%s/.ssh/authorized_keys",
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- ses.authstate.pw_dir);
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+ if (ses.authstate.pw_uid == 0) {
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+ len = n_global_authkeys_dir + n_authkeys_file;
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+ filename = m_malloc(len);
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+ snprintf(filename, len, "%s/%s", global_authkeys_dir, authkeys_file);
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+ } else {
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+ /* we don't need to check pw and pw_dir for validity, since
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+ * its been done in checkpubkeyperms. */
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+ len = strlen(ses.authstate.pw_dir);
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+ /* allocate max required pathname storage,
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+ * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
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+ len += n_user_authkeys_dir + n_authkeys_file + 1;
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+ filename = m_malloc(len);
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+ snprintf(filename, len, "%s/%s/%s", ses.authstate.pw_dir,
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+ user_authkeys_dir, authkeys_file);
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+ }
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authfile = fopen(filename, "r");
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if (!authfile) {
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@@ -543,27 +557,41 @@ static int checkpubkeyperms() {
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goto out;
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}
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- /* allocate max required pathname storage,
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- * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
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- len += 22;
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- filename = m_malloc(len);
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- strlcpy(filename, ses.authstate.pw_dir, len);
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+ if (ses.authstate.pw_uid == 0) {
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+ if (checkfileperm(global_authkeys_dir) != DROPBEAR_SUCCESS) {
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+ goto out;
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+ }
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- /* check ~ */
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- if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
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- goto out;
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- }
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+ len = n_global_authkeys_dir + n_authkeys_file;
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+ filename = m_malloc(len);
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- /* check ~/.ssh */
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- strlcat(filename, "/.ssh", len);
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- if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
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- goto out;
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- }
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+ snprintf(filename, len, "%s/%s", global_authkeys_dir, authkeys_file);
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+ if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
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+ goto out;
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+ }
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+ } else {
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+ /* check ~ */
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+ if (checkfileperm(ses.authstate.pw_dir) != DROPBEAR_SUCCESS) {
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+ goto out;
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+ }
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- /* now check ~/.ssh/authorized_keys */
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- strlcat(filename, "/authorized_keys", len);
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- if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
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- goto out;
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+ /* allocate max required pathname storage,
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+ * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
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+ len += n_user_authkeys_dir + n_authkeys_file + 1;
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+ filename = m_malloc(len);
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+
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+ /* check ~/.ssh */
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+ snprintf(filename, len, "%s/%s", ses.authstate.pw_dir, user_authkeys_dir);
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+ if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
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+ goto out;
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+ }
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+
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+ /* now check ~/.ssh/authorized_keys */
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+ snprintf(filename, len, "%s/%s/%s", ses.authstate.pw_dir,
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+ user_authkeys_dir, authkeys_file);
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+ if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
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+ goto out;
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+ }
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}
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/* file looks ok, return success */
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