зеркало из https://github.com/github/putty.git
77 строки
2.5 KiB
C
77 строки
2.5 KiB
C
/*
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* Packet-censoring code for SSH-1, used to identify sensitive fields
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* like passwords so that the logging system can avoid writing them
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* into log files.
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*/
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#include <assert.h>
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#include "putty.h"
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#include "ssh.h"
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int ssh1_censor_packet(
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const PacketLogSettings *pls, int type, bool sender_is_client,
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ptrlen pkt, logblank_t *blanks)
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{
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int nblanks = 0;
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ptrlen str;
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BinarySource src[1];
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BinarySource_BARE_INIT(src, pkt.ptr, pkt.len);
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if (pls->omit_data &&
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(type == SSH1_SMSG_STDOUT_DATA ||
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type == SSH1_SMSG_STDERR_DATA ||
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type == SSH1_CMSG_STDIN_DATA ||
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type == SSH1_MSG_CHANNEL_DATA)) {
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/* "Session data" packets - omit the data string. */
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if (type == SSH1_MSG_CHANNEL_DATA)
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get_uint32(src); /* skip channel id */
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str = get_string(src);
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if (!get_err(src)) {
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assert(nblanks < MAX_BLANKS);
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blanks[nblanks].offset = src->pos - str.len;
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blanks[nblanks].type = PKTLOG_OMIT;
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blanks[nblanks].len = str.len;
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nblanks++;
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}
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}
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if (sender_is_client && pls->omit_passwords) {
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if (type == SSH1_CMSG_AUTH_PASSWORD ||
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type == SSH1_CMSG_AUTH_TIS_RESPONSE ||
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type == SSH1_CMSG_AUTH_CCARD_RESPONSE) {
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/* If this is a password or similar packet, blank the
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* password(s). */
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assert(nblanks < MAX_BLANKS);
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blanks[nblanks].offset = 0;
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blanks[nblanks].len = pkt.len;
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blanks[nblanks].type = PKTLOG_BLANK;
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nblanks++;
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} else if (type == SSH1_CMSG_X11_REQUEST_FORWARDING) {
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/*
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* If this is an X forwarding request packet, blank the
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* fake auth data.
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*
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* Note that while we blank the X authentication data
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* here, we don't take any special action to blank the
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* start of an X11 channel, so using MIT-MAGIC-COOKIE-1
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* and actually opening an X connection without having
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* session blanking enabled is likely to leak your cookie
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* into the log.
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*/
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get_string(src); /* skip protocol name */
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str = get_string(src);
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if (!get_err(src)) {
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assert(nblanks < MAX_BLANKS);
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blanks[nblanks].offset = src->pos - str.len;
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blanks[nblanks].type = PKTLOG_BLANK;
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blanks[nblanks].len = str.len;
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nblanks++;
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}
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}
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}
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return nblanks;
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}
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