Mercurial > dropbear

comparison svr-authpubkey.c @ 1422:4cebe907dfd0

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limit input size
author Matt Johnston <matt@ucc.asn.au>
date Thu, 25 May 2017 22:21:23 +0800
parents 814f22d4a58f
children 7e95ab97d2b0 06d52bcb8094
comparison
equal deleted inserted replaced
1421:814f22d4a58f 1422:4cebe907dfd0
193 const unsigned char* keyblob, unsigned int keybloblen) { 193 const unsigned char* keyblob, unsigned int keybloblen) {
194 buffer *options_buf = NULL; 194 buffer *options_buf = NULL;
195 unsigned int pos, len; 195 unsigned int pos, len;
196 int ret = DROPBEAR_FAILURE; 196 int ret = DROPBEAR_FAILURE;
197 197
198 if (line->len < MIN_AUTHKEYS_LINE) { 198 if (line->len < MIN_AUTHKEYS_LINE || line->len > MAX_AUTHKEYS_LINE) {
199 TRACE(("checkpubkey: line too short")) 199 TRACE(("checkpubkey: bad line length %d", line->len))
200 return DROPBEAR_FAILURE; /* line is too short for it to be a valid key */ 200 return DROPBEAR_FAILURE;
201 } 201 }
202 202
203 /* compare the algorithm. +3 so we have enough bytes to read a space and some base64 characters too. */ 203 /* compare the algorithm. +3 so we have enough bytes to read a space and some base64 characters too. */
204 if (line->pos + algolen+3 > line->len) { 204 if (line->pos + algolen+3 > line->len) {
205 goto out; 205 goto out;