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83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
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#include "fuzz.h"
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#include "session.h"
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#include "fuzz-wrapfd.h"
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#include "debug.h"
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#include "runopts.h"
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#include "algo.h"
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#include "bignum.h"
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int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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static int once = 0;
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static const struct dropbear_kex *ecdh[3]; /* 256, 384, 521 */
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static struct key_context* keep_newkeys = NULL;
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/* number of generated parameters is limited by the timeout for the first run */
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#define NUM_PARAMS 80
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static struct kex_ecdh_param *ecdh_params[NUM_PARAMS];
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if (!once) {
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fuzz_common_setup();
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fuzz_svr_setup();
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/* ses gets zeroed by fuzz_set_input */
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keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
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ecdh[0] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp256");
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ecdh[1] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp384");
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ecdh[2] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp521");
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assert(ecdh[0]);
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assert(ecdh[1]);
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assert(ecdh[2]);
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keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
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ses.newkeys = keep_newkeys;
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/* Pre-generate parameters */
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int i;
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for (i = 0; i < NUM_PARAMS; i++) {
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ses.newkeys->algo_kex = ecdh[i % 3];
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ecdh_params[i] = gen_kexecdh_param();
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}
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once = 1;
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}
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if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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return 0;
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}
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m_malloc_set_epoch(1);
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if (setjmp(fuzz.jmp) == 0) {
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/* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply()
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with DROPBEAR_KEX_ECDH */
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ses.newkeys = keep_newkeys;
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/* random choice of ecdh 256, 384, 521 */
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unsigned char b = buf_getbyte(fuzz.input);
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ses.newkeys->algo_kex = ecdh[b % 3];
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/* Choose from the collection of ecdh params */
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unsigned int e = buf_getint(fuzz.input);
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struct kex_ecdh_param *ecdh_param = ecdh_params[e % NUM_PARAMS];
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buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
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ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
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kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
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mp_clear(ses.dh_K);
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m_free(ses.dh_K);
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buf_free(ecdh_qs);
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buf_free(ses.hash);
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buf_free(ses.session_id);
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/* kexhashbuf is freed in kexdh_comb_key */
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m_malloc_free_epoch(1, 0);
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} else {
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m_malloc_free_epoch(1, 1);
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TRACE(("dropbear_exit longjmped"))
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/* dropbear_exit jumped here */
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}
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return 0;
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}
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