Mercurial > dropbear
view svr-algo.c @ 47:4b53a43f0082
- client pubkey auth works
- rearrange the runopts code for client and server (hostkey reading is needed
by both (if the client is doing pubkey auth. otherwise....))
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Fri, 06 Aug 2004 16:18:01 +0000 |
parents | 0969767bca0d |
children | e3adf4cf5465 |
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#include "algo.h" #include "dbutil.h" /* match the first algorithm in the comma-separated list in buf which is * also in localalgos[], or return NULL on failure. * (*goodguess) is set to 1 if the preferred client/server algos match, * 0 otherwise. This is used for checking if the kexalgo/hostkeyalgos are * guessed correctly */ algo_type * svr_buf_match_algo(buffer* buf, algo_type localalgos[], int *goodguess) { unsigned char * algolist = NULL; unsigned char * remotealgos[MAX_PROPOSED_ALGO]; unsigned int len; unsigned int count, i, j; algo_type * ret = NULL; *goodguess = 0; /* get the comma-separated list from the buffer ie "algo1,algo2,algo3" */ algolist = buf_getstring(buf, &len); /* Debug this */ TRACE(("buf_match_algo: %s", algolist)); if (len > MAX_PROPOSED_ALGO*(MAX_NAME_LEN+1)) { goto out; /* just a sanity check, no other use */ } /* remotealgos will contain a list of the strings parsed out */ /* We will have at least one string (even if it's just "") */ remotealgos[0] = algolist; count = 1; /* Iterate through, replacing ','s with NULs, to split it into * words. */ for (i = 0; i < len; i++) { if (algolist[i] == '\0') { /* someone is trying something strange */ goto out; } if (algolist[i] == ',') { algolist[i] = '\0'; remotealgos[count] = &algolist[i+1]; count++; } if (count == MAX_PROPOSED_ALGO) { break; } } /* iterate and find the first match */ for (i = 0; i < count; i++) { len = strlen(remotealgos[i]); for (j = 0; localalgos[j].name != NULL; j++) { if (localalgos[j].usable) { if (len == strlen(localalgos[j].name) && strncmp(localalgos[j].name, remotealgos[i], len) == 0) { /* set if it was a good guess */ if (i == 0 && j == 0) { *goodguess = 1; } /* set the algo to return */ ret = &localalgos[j]; goto out; } } } } out: m_free(algolist); return ret; }