--- /dev/null
+/*-
+ * Copyright 2005 Colin Percival
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/endian.h>
+#include <sys/types.h>
+
+#include <string.h>
+
+#include "sha256.h"
+
+#if BYTE_ORDER == BIG_ENDIAN
+
+/* Copy a vector of big-endian uint32_t into a vector of bytes */
+#define be32enc_vect(dst, src, len) \
+ memcpy((void *)dst, (const void *)src, (size_t)len)
+
+/* Copy a vector of bytes into a vector of big-endian uint32_t */
+#define be32dec_vect(dst, src, len) \
+ memcpy((void *)dst, (const void *)src, (size_t)len)
+
+#else /* BYTE_ORDER != BIG_ENDIAN */
+
+/*
+ * Encode a length len/4 vector of (uint32_t) into a length len vector of
+ * (unsigned char) in big-endian form. Assumes len is a multiple of 4.
+ */
+static void
+be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len / 4; i++)
+ be32enc(dst + i * 4, src[i]);
+}
+
+/*
+ * Decode a big-endian length len vector of (unsigned char) into a length
+ * len/4 vector of (uint32_t). Assumes len is a multiple of 4.
+ */
+static void
+be32dec_vect(uint32_t *dst, const unsigned char *src, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len / 4; i++)
+ dst[i] = be32dec(src + i * 4);
+}
+
+#endif /* BYTE_ORDER != BIG_ENDIAN */
+
+/* Elementary functions used by SHA256 */
+#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
+#define Maj(x, y, z) ((x & (y | z)) | (y & z))
+#define SHR(x, n) (x >> n)
+#define ROTR(x, n) ((x >> n) | (x << (32 - n)))
+#define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
+#define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
+#define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
+#define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
+
+/* SHA256 round function */
+#define RND(a, b, c, d, e, f, g, h, k) \
+ t0 = h + S1(e) + Ch(e, f, g) + k; \
+ t1 = S0(a) + Maj(a, b, c); \
+ d += t0; \
+ h = t0 + t1;
+
+/* Adjusted round function for rotating state */
+#define RNDr(S, W, i, k) \
+ RND(S[(64 - i) % 8], S[(65 - i) % 8], \
+ S[(66 - i) % 8], S[(67 - i) % 8], \
+ S[(68 - i) % 8], S[(69 - i) % 8], \
+ S[(70 - i) % 8], S[(71 - i) % 8], \
+ W[i] + k)
+
+/*
+ * SHA256 block compression function. The 256-bit state is transformed via
+ * the 512-bit input block to produce a new state.
+ */
+static void
+SHA256_Transform(uint32_t * state, const unsigned char block[64])
+{
+ uint32_t W[64];
+ uint32_t S[8];
+ uint32_t t0, t1;
+ int i;
+
+ /* 1. Prepare message schedule W. */
+ be32dec_vect(W, block, 64);
+ for (i = 16; i < 64; i++)
+ W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
+
+ /* 2. Initialize working variables. */
+ memcpy(S, state, 32);
+
+ /* 3. Mix. */
+ RNDr(S, W, 0, 0x428a2f98);
+ RNDr(S, W, 1, 0x71374491);
+ RNDr(S, W, 2, 0xb5c0fbcf);
+ RNDr(S, W, 3, 0xe9b5dba5);
+ RNDr(S, W, 4, 0x3956c25b);
+ RNDr(S, W, 5, 0x59f111f1);
+ RNDr(S, W, 6, 0x923f82a4);
+ RNDr(S, W, 7, 0xab1c5ed5);
+ RNDr(S, W, 8, 0xd807aa98);
+ RNDr(S, W, 9, 0x12835b01);
+ RNDr(S, W, 10, 0x243185be);
+ RNDr(S, W, 11, 0x550c7dc3);
+ RNDr(S, W, 12, 0x72be5d74);
+ RNDr(S, W, 13, 0x80deb1fe);
+ RNDr(S, W, 14, 0x9bdc06a7);
+ RNDr(S, W, 15, 0xc19bf174);
+ RNDr(S, W, 16, 0xe49b69c1);
+ RNDr(S, W, 17, 0xefbe4786);
+ RNDr(S, W, 18, 0x0fc19dc6);
+ RNDr(S, W, 19, 0x240ca1cc);
+ RNDr(S, W, 20, 0x2de92c6f);
+ RNDr(S, W, 21, 0x4a7484aa);
+ RNDr(S, W, 22, 0x5cb0a9dc);
+ RNDr(S, W, 23, 0x76f988da);
+ RNDr(S, W, 24, 0x983e5152);
+ RNDr(S, W, 25, 0xa831c66d);
+ RNDr(S, W, 26, 0xb00327c8);
+ RNDr(S, W, 27, 0xbf597fc7);
+ RNDr(S, W, 28, 0xc6e00bf3);
+ RNDr(S, W, 29, 0xd5a79147);
+ RNDr(S, W, 30, 0x06ca6351);
+ RNDr(S, W, 31, 0x14292967);
+ RNDr(S, W, 32, 0x27b70a85);
+ RNDr(S, W, 33, 0x2e1b2138);
+ RNDr(S, W, 34, 0x4d2c6dfc);
+ RNDr(S, W, 35, 0x53380d13);
+ RNDr(S, W, 36, 0x650a7354);
+ RNDr(S, W, 37, 0x766a0abb);
+ RNDr(S, W, 38, 0x81c2c92e);
+ RNDr(S, W, 39, 0x92722c85);
+ RNDr(S, W, 40, 0xa2bfe8a1);
+ RNDr(S, W, 41, 0xa81a664b);
+ RNDr(S, W, 42, 0xc24b8b70);
+ RNDr(S, W, 43, 0xc76c51a3);
+ RNDr(S, W, 44, 0xd192e819);
+ RNDr(S, W, 45, 0xd6990624);
+ RNDr(S, W, 46, 0xf40e3585);
+ RNDr(S, W, 47, 0x106aa070);
+ RNDr(S, W, 48, 0x19a4c116);
+ RNDr(S, W, 49, 0x1e376c08);
+ RNDr(S, W, 50, 0x2748774c);
+ RNDr(S, W, 51, 0x34b0bcb5);
+ RNDr(S, W, 52, 0x391c0cb3);
+ RNDr(S, W, 53, 0x4ed8aa4a);
+ RNDr(S, W, 54, 0x5b9cca4f);
+ RNDr(S, W, 55, 0x682e6ff3);
+ RNDr(S, W, 56, 0x748f82ee);
+ RNDr(S, W, 57, 0x78a5636f);
+ RNDr(S, W, 58, 0x84c87814);
+ RNDr(S, W, 59, 0x8cc70208);
+ RNDr(S, W, 60, 0x90befffa);
+ RNDr(S, W, 61, 0xa4506ceb);
+ RNDr(S, W, 62, 0xbef9a3f7);
+ RNDr(S, W, 63, 0xc67178f2);
+
+ /* 4. Mix local working variables into global state */
+ for (i = 0; i < 8; i++)
+ state[i] += S[i];
+}
+
+static unsigned char PAD[64] = {
+ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/* Add padding and terminating bit-count. */
+static void
+SHA256_Pad(SHA256_CTX * ctx)
+{
+ unsigned char len[8];
+ uint32_t r, plen;
+
+ /*
+ * Convert length to a vector of bytes -- we do this now rather
+ * than later because the length will change after we pad.
+ */
+ be64enc(len, ctx->count);
+
+ /* Add 1--64 bytes so that the resulting length is 56 mod 64 */
+ r = (ctx->count >> 3) & 0x3f;
+ plen = (r < 56) ? (56 - r) : (120 - r);
+ SHA256_Update(ctx, PAD, (size_t)plen);
+
+ /* Add the terminating bit-count */
+ SHA256_Update(ctx, len, 8);
+}
+
+/* SHA-256 initialization. Begins a SHA-256 operation. */
+void
+SHA256_Init(SHA256_CTX * ctx)
+{
+
+ /* Zero bits processed so far */
+ ctx->count = 0;
+
+ /* Magic initialization constants */
+ ctx->state[0] = 0x6A09E667;
+ ctx->state[1] = 0xBB67AE85;
+ ctx->state[2] = 0x3C6EF372;
+ ctx->state[3] = 0xA54FF53A;
+ ctx->state[4] = 0x510E527F;
+ ctx->state[5] = 0x9B05688C;
+ ctx->state[6] = 0x1F83D9AB;
+ ctx->state[7] = 0x5BE0CD19;
+}
+
+/* Add bytes into the hash */
+void
+SHA256_Update(SHA256_CTX * ctx, const void *in, size_t len)
+{
+ uint64_t bitlen;
+ uint32_t r;
+ const unsigned char *src = in;
+
+ /* Number of bytes left in the buffer from previous updates */
+ r = (ctx->count >> 3) & 0x3f;
+
+ /* Convert the length into a number of bits */
+ bitlen = len << 3;
+
+ /* Update number of bits */
+ ctx->count += bitlen;
+
+ /* Handle the case where we don't need to perform any transforms */
+ if (len < 64 - r) {
+ memcpy(&ctx->buf[r], src, len);
+ return;
+ }
+
+ /* Finish the current block */
+ memcpy(&ctx->buf[r], src, 64 - r);
+ SHA256_Transform(ctx->state, ctx->buf);
+ src += 64 - r;
+ len -= 64 - r;
+
+ /* Perform complete blocks */
+ while (len >= 64) {
+ SHA256_Transform(ctx->state, src);
+ src += 64;
+ len -= 64;
+ }
+
+ /* Copy left over data into buffer */
+ memcpy(ctx->buf, src, len);
+}
+
+/*
+ * SHA-256 finalization. Pads the input data, exports the hash value,
+ * and clears the context state.
+ */
+void
+SHA256_Final(unsigned char digest[32], SHA256_CTX * ctx)
+{
+
+ /* Add padding */
+ SHA256_Pad(ctx);
+
+ /* Write the hash */
+ be32enc_vect(digest, ctx->state, 32);
+
+ /* Clear the context state */
+ memset((void *)ctx, 0, sizeof(*ctx));
+}
#include "ipv6.h"
#include "ipv6nd.h"
+#ifdef SHA2_H
+# include SHA2_H
+#else
+# include "sha256.h"
+#endif
+
+#ifndef SHA256_DIGEST_LENGTH
+# define SHA256_DIGEST_LENGTH 32
+#endif
+
#ifdef IPV6_POLLADDRFLAG
# warning kernel does not report IPv6 address flag changes
# warning polling tentative address flags periodically instead
return (ssize_t)l;
}
+static ssize_t
+ipv6_readsecret(struct dhcpcd_ctx *ctx)
+{
+ FILE *fp;
+ char line[1024];
+ unsigned char *p;
+ size_t len;
+ uint32_t r;
+ int x;
+
+ if ((fp = fopen(SECRET, "r"))) {
+ while (fgets(line, sizeof(line), fp)) {
+ len = strlen(line);
+ if (len) {
+ if (line[len - 1] == '\n')
+ line[len - 1] = '\0';
+ }
+ len = hwaddr_aton(NULL, line);
+ if (len) {
+ ctx->secret_len = hwaddr_aton(ctx->secret,
+ line);
+ break;
+ }
+ len = 0;
+ }
+ fclose(fp);
+ if (len)
+ return (ssize_t)len;
+ } else {
+ if (errno != ENOENT)
+ syslog(LOG_ERR, "error reading secret: %s: %m", SECRET);
+ }
+
+ /* Chaining arc4random should be good enough.
+ * RFC7217 section 5.1 states the key SHOULD be at least 128 bits.
+ * To attempt and future proof ourselves, we'll generate a key of
+ * 512 bits (64 bytes). */
+ p = ctx->secret;
+ ctx->secret_len = 0;
+ for (len = 0; len < 512 / NBBY; len += sizeof(r)) {
+ r = arc4random();
+ memcpy(p, &r, sizeof(r));
+ p += sizeof(r);
+ ctx->secret_len += sizeof(r);
+
+ }
+
+ if (!(fp = fopen(SECRET, "w")))
+ goto eexit;
+ x = fprintf(fp, "%s\n",
+ hwaddr_ntoa(ctx->secret, ctx->secret_len, line, sizeof(line)));
+ fclose(fp);
+ if (x > 0)
+ return (ssize_t)ctx->secret_len;
+
+eexit:
+ syslog(LOG_ERR, "error writing secret: %s: %m", SECRET);
+ unlink(SECRET);
+ ctx->secret_len = 0;
+ return -1;
+}
+
+/* RFC7217 */
+int
+ipv6_makestableprivate(struct in6_addr *addr,
+ const struct in6_addr *prefix, int prefix_len,
+ const unsigned char *netiface, size_t netiface_len,
+ const char *netid, size_t netid_len,
+ uint32_t dad_counter,
+ const unsigned char *secret, size_t secret_len)
+{
+ unsigned char buf[2048], *p, digest[SHA256_DIGEST_LENGTH];
+ size_t len, l;
+ SHA256_CTX ctx;
+
+ if (prefix_len < 0 || prefix_len > 120) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ l = (size_t)(ROUNDUP8(prefix_len) / NBBY);
+ len = l + netiface_len + netid_len + sizeof(dad_counter) + secret_len;
+ if (len > sizeof(buf)) {
+ errno = ENOBUFS;
+ return -1;
+ }
+
+ /* Combine all parameters into one buffer */
+ p = buf;
+ memcpy(p, prefix, l);
+ p += l;
+ memcpy(p, netiface, netiface_len);
+ p += netiface_len;
+ memcpy(p, netid, netid_len);
+ p += netid_len;
+ memcpy(p, &dad_counter, sizeof(dad_counter));
+ p += sizeof(dad_counter);
+ memcpy(p, secret, secret_len);
+
+ /* Make an address using the prefix and the digest of the above.
+ * RFC7217 Section 5.1 states that we shouldn't use MD5.
+ * Pity as we use that for HMAC-MD5 which is still deemed OK.
+ * SHA-256 is recommended */
+ SHA256_Init(&ctx);
+ SHA256_Update(&ctx, buf, len);
+ SHA256_Final(digest, &ctx);
+
+ p = addr->s6_addr;
+ memcpy(p, prefix, l);
+ /* RFC7217 section 5.2 says we need to start taking the id from
+ * the least significant bit */
+ len = sizeof(addr->s6_addr) - l;
+ memcpy(p + l, digest + (sizeof(digest) - len), len);
+
+ return 0;
+}
+
int
ipv6_makeaddr(struct in6_addr *addr, const struct interface *ifp,
const struct in6_addr *prefix, int prefix_len)
{
const struct ipv6_addr *ap;
- if (prefix_len < 0 || prefix_len > 64) {
+ if (prefix_len < 0 || prefix_len > 120) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (ifp->options->options & DHCPCD_STABLEPRIVATE) {
+ if (ifp->ctx->secret_len == 0) {
+ if (ipv6_readsecret(ifp->ctx) == -1)
+ return -1;
+ }
+ if (ipv6_makestableprivate(addr, prefix, prefix_len,
+ ifp->options->iaid, sizeof(ifp->options->iaid),
+ ifp->ssid, strlen(ifp->ssid),
+ 0, /* DAD counter starts at 0 */
+ ifp->ctx->secret, ifp->ctx->secret_len) == -1)
+ return -1;
+ return 0;
+ }
+
+ if (prefix_len > 64) {
errno = EINVAL;
return -1;
}
projects / thirdparty / dhcpcd.git / commitdiff
