Merge branches 'feature_16582' and 'feature_16581'

src/common/crypto_curve25519.c

@@ -201,7 +201,7 @@ crypto_write_tagged_contents_to_file(const char *fname,
  * <b>data_out_len</b>-byte buffer in <b>data_out</b>. Check that the
  * typestring matches <b>typestring</b>; store the tag into a newly allocated
  * string in <b>tag_out</b>. Return -1 on failure, and the number of bytes of
- * data on success. */
+ * data on success.  Preserves the errno from reading the file. */
 ssize_t
 crypto_read_tagged_contents_from_file(const char *fname,
                                       const char *typestring,
@@ -214,27 +214,36 @@ crypto_read_tagged_contents_from_file(const char *fname,
   struct stat st;
   ssize_t r = -1;
   size_t st_size = 0;
+  int saved_errno = 0;
 
   *tag_out = NULL;
   st.st_size = 0;
   content = read_file_to_str(fname, RFTS_BIN|RFTS_IGNORE_MISSING, &st);
-  if (! content)
+  if (! content) {
+    saved_errno = errno;
     goto end;
-  if (st.st_size < 32 || st.st_size > 32 + data_out_len)
+  }
+  if (st.st_size < 32 || st.st_size > 32 + data_out_len) {
+    saved_errno = EINVAL;
     goto end;
+  }
   st_size = (size_t)st.st_size;
 
   memcpy(prefix, content, 32);
   prefix[32] = 0;
   /* Check type, extract tag. */
   if (strcmpstart(prefix, "== ") || strcmpend(prefix, " ==") ||
-      ! tor_mem_is_zero(prefix+strlen(prefix), 32-strlen(prefix)))
+      ! tor_mem_is_zero(prefix+strlen(prefix), 32-strlen(prefix))) {
+    saved_errno = EINVAL;
     goto end;
+  }
 
   if (strcmpstart(prefix+3, typestring) ||
       3+strlen(typestring) >= 32 ||
-      strcmpstart(prefix+3+strlen(typestring), ": "))
+      strcmpstart(prefix+3+strlen(typestring), ": ")) {
+    saved_errno = EINVAL;
     goto end;
+  }
 
   *tag_out = tor_strndup(prefix+5+strlen(typestring),
                          strlen(prefix)-8-strlen(typestring));
@@ -246,6 +255,8 @@ crypto_read_tagged_contents_from_file(const char *fname,
   if (content)
     memwipe(content, 0, st_size);
   tor_free(content);
+  if (saved_errno)
+    errno = saved_errno;
   return r;
 }
 

src/common/crypto_ed25519.c

@@ -381,10 +381,13 @@ ed25519_seckey_read_from_file(ed25519_secret_key_t *seckey_out,
   len = crypto_read_tagged_contents_from_file(filename, "ed25519v1-secret",
                                               tag_out, seckey_out->seckey,
                                               sizeof(seckey_out->seckey));
-  if (len != sizeof(seckey_out->seckey))
+  if (len == sizeof(seckey_out->seckey)) {
-    return -1;
+    return 0;
+  } else if (len >= 0) {
+    errno = EINVAL;
+  }
 
-  return 0;
+  return -1;
 }
 
 /**
@@ -417,10 +420,13 @@ ed25519_pubkey_read_from_file(ed25519_public_key_t *pubkey_out,
   len = crypto_read_tagged_contents_from_file(filename, "ed25519v1-public",
                                               tag_out, pubkey_out->pubkey,
                                               sizeof(pubkey_out->pubkey));
-  if (len != sizeof(pubkey_out->pubkey))
+  if (len == sizeof(pubkey_out->pubkey)) {
-    return -1;
+    return 0;
+  } else if (len >= 0) {
+    errno = EINVAL;
+  }
 
-  return 0;
+  return -1;
 }
 
 /** Release all storage held for <b>kp</b>. */

src/common/util.c

@@ -1997,8 +1997,10 @@ read_all(tor_socket_t fd, char *buf, size_t count, int isSocket)
   size_t numread = 0;
   ssize_t result;
 
-  if (count > SIZE_T_CEILING || count > SSIZE_MAX)
+  if (count > SIZE_T_CEILING || count > SSIZE_MAX) {
+    errno = EINVAL;
     return -1;
+  }
 
   while (numread != count) {
     if (isSocket)
@@ -2558,8 +2560,10 @@ read_file_to_str_until_eof(int fd, size_t max_bytes_to_read, size_t *sz_out)
   char *string = NULL;
   size_t string_max = 0;
 
-  if (max_bytes_to_read+1 >= SIZE_T_CEILING)
+  if (max_bytes_to_read+1 >= SIZE_T_CEILING) {
+    errno = EINVAL; 
     return NULL;
+  }
 
   do {
     /* XXXX This "add 1K" approach is a little goofy; if we care about
@@ -2571,7 +2575,9 @@ read_file_to_str_until_eof(int fd, size_t max_bytes_to_read, size_t *sz_out)
     string = tor_realloc(string, string_max);
     r = read(fd, string + pos, string_max - pos - 1);
     if (r < 0) {
+      int save_errno = errno;
       tor_free(string);
+      errno = save_errno;
       return NULL;
     }
 
@@ -2639,17 +2645,21 @@ read_file_to_str(const char *filename, int flags, struct stat *stat_out)
   if (S_ISFIFO(statbuf.st_mode)) {
     size_t sz = 0;
     string = read_file_to_str_until_eof(fd, FIFO_READ_MAX, &sz);
+    int save_errno = errno;
     if (string && stat_out) {
       statbuf.st_size = sz;
       memcpy(stat_out, &statbuf, sizeof(struct stat));
     }
     close(fd);
+    if (!string)
+      errno = save_errno;
     return string;
   }
 #endif
 
   if ((uint64_t)(statbuf.st_size)+1 >= SIZE_T_CEILING) {
     close(fd);
+    errno = EINVAL;
     return NULL;
   }
 

src/or/routerkeys.c

@@ -21,6 +21,7 @@ read_encrypted_secret_key(ed25519_secret_key_t *out,
   char pwbuf[256];
   uint8_t encrypted_key[256];
   char *tag = NULL;
+  int saved_errno = 0;
 
   ssize_t encrypted_len = crypto_read_tagged_contents_from_file(fname,
                                           ENC_KEY_HEADER,
@@ -28,24 +29,30 @@ read_encrypted_secret_key(ed25519_secret_key_t *out,
                                           encrypted_key,
                                           sizeof(encrypted_key));
   if (encrypted_len < 0) {
+    saved_errno = errno;
     log_info(LD_OR, "%s is missing", fname);
     r = 0;
     goto done;
   }
-  if (strcmp(tag, ENC_KEY_TAG))
+  if (strcmp(tag, ENC_KEY_TAG)) {
+    saved_errno = EINVAL;
     goto done;
+  }
 
   while (1) {
     ssize_t pwlen =
       tor_getpass("Enter pasphrase for master key:", pwbuf, sizeof(pwbuf));
-    if (pwlen < 0)
+    if (pwlen < 0) {
+      saved_errno = EINVAL;
       goto done;
+    }
 
     const int r = crypto_unpwbox(&secret, &secret_len,
                                  encrypted_key, encrypted_len,
                                  pwbuf, pwlen);
     if (r == UNPWBOX_CORRUPTED) {
       log_err(LD_OR, "%s is corrupted.", fname);
+      saved_errno = EINVAL;
       goto done;
     } else if (r == UNPWBOX_OKAY) {
       break;
@@ -57,6 +64,7 @@ read_encrypted_secret_key(ed25519_secret_key_t *out,
 
   if (secret_len != ED25519_SECKEY_LEN) {
     log_err(LD_OR, "%s is corrupted.", fname);
+    saved_errno = EINVAL;
     goto done;
   }
   memcpy(out->seckey, secret, ED25519_SECKEY_LEN);
@@ -70,6 +78,8 @@ read_encrypted_secret_key(ed25519_secret_key_t *out,
     memwipe(secret, 0, secret_len);
     tor_free(secret);
   }
+  if (saved_errno)
+    errno = saved_errno;
   return r;
 }
 
@@ -160,10 +170,13 @@ write_secret_key(const ed25519_secret_key_t *key, int encrypted,
  * public key file but no secret key file, return successfully anyway.
  *
  * If INIT_ED_KEY_OMIT_SECRET is set in <b>flags</b>, do not even try to
- * load or return a secret key (but create and save on if needed).
+ * load or return a secret key (but create and save one if needed).
  *
  * If INIT_ED_KEY_TRY_ENCRYPTED is set, we look for an encrypted secret key
  * and consider encrypting any new secret key.
+ *
+ * If INIT_ED_KEY_NO_REPAIR is set, and there is any issue loading the keys
+ * from disk _other than their absence_, we do not try to replace them.
  */
 ed25519_keypair_t *
 ed_key_init_from_file(const char *fname, uint32_t flags,
@@ -178,9 +191,16 @@ ed_key_init_from_file(const char *fname, uint32_t flags,
   char *encrypted_secret_fname = NULL;
   char *public_fname = NULL;
   char *cert_fname = NULL;
+  const char *loaded_secret_fname = NULL;
   int created_pk = 0, created_sk = 0, created_cert = 0;
   const int try_to_load = ! (flags & INIT_ED_KEY_REPLACE);
-  const int encrypt_key = (flags & INIT_ED_KEY_TRY_ENCRYPTED);
+  const int encrypt_key = !! (flags & INIT_ED_KEY_TRY_ENCRYPTED);
+  const int norepair = !! (flags & INIT_ED_KEY_NO_REPAIR);
+  const int split = !! (flags & INIT_ED_KEY_SPLIT);
+
+  /* we don't support setting both of these flags at once. */
+  tor_assert((flags & (INIT_ED_KEY_NO_REPAIR|INIT_ED_KEY_NEEDCERT)) !=
+                      (INIT_ED_KEY_NO_REPAIR|INIT_ED_KEY_NEEDCERT));
 
   char tag[8];
   tor_snprintf(tag, sizeof(tag), "type%d", (int)cert_type);
@@ -195,10 +215,22 @@ ed_key_init_from_file(const char *fname, uint32_t flags,
   tor_asprintf(&cert_fname, "%s_cert", fname);
 
   /* Try to read the secret key. */
-  int have_secret = try_to_load &&
+  int have_secret = 0;
-    !(flags & INIT_ED_KEY_OMIT_SECRET) &&
+  if (try_to_load &&
-    ed25519_seckey_read_from_file(&keypair->seckey,
+      !(flags & INIT_ED_KEY_OMIT_SECRET)) {
-                                  &got_tag, secret_fname) == 0;
+    int rv = ed25519_seckey_read_from_file(&keypair->seckey,
+                                           &got_tag, secret_fname);
+    if (rv == 0) {
+      have_secret = 1;
+      loaded_secret_fname = secret_fname;
+    } else {
+      if (errno != ENOENT && norepair) {
+        tor_log(severity, LD_OR, "Unable to read %s: %s", secret_fname,
+                strerror(errno));
+        goto err;
+      }
+    }
+  }
 
   /* Should we try for an encrypted key? */
   if (!have_secret && try_to_load && encrypt_key) {
@@ -207,31 +239,58 @@ ed_key_init_from_file(const char *fname, uint32_t flags,
     if (r > 0) {
       have_secret = 1;
       got_tag = tor_strdup(tag);
+      loaded_secret_fname = encrypted_secret_fname;
+    } else if (errno != ENOENT && norepair) {
+      tor_log(severity, LD_OR, "Unable to read %s: %s", encrypted_secret_fname,
+              strerror(errno));
+      goto err;
     }
   }
 
   if (have_secret) {
     if (strcmp(got_tag, tag)) {
-      tor_log(severity, LD_OR, "%s has wrong tag", secret_fname);
+      tor_log(severity, LD_OR, "%s has wrong tag", loaded_secret_fname);
       goto err;
     }
     /* Derive the public key */
     if (ed25519_public_key_generate(&keypair->pubkey, &keypair->seckey)<0) {
-      tor_log(severity, LD_OR, "%s can't produce a public key", secret_fname);
+      tor_log(severity, LD_OR, "%s can't produce a public key",
+              loaded_secret_fname);
       goto err;
     }
   }
 
-  /* If it's absent and that's okay, try to read the pubkey. */
+  /* If it's absent and that's okay, or if we do split keys here, try to re
+   * the pubkey. */
   int found_public = 0;
-  if (!have_secret && try_to_load) {
+  if ((!have_secret && try_to_load) || (have_secret && split)) {
+    ed25519_public_key_t pubkey_tmp;
     tor_free(got_tag);
-    found_public = ed25519_pubkey_read_from_file(&keypair->pubkey,
+    found_public = ed25519_pubkey_read_from_file(&pubkey_tmp,
                                                  &got_tag, public_fname) == 0;
+    if (!found_public && errno != ENOENT && norepair) {
+      tor_log(severity, LD_OR, "Unable to read %s: %s", public_fname,
+              strerror(errno));
+      goto err;
+    }
     if (found_public && strcmp(got_tag, tag)) {
       tor_log(severity, LD_OR, "%s has wrong tag", public_fname);
       goto err;
     }
+    if (found_public) {
+      if (have_secret) {
+        /* If we have a secret key and we're reloading the public key,
+         * the key must match! */
+        if (! ed25519_pubkey_eq(&keypair->pubkey, &pubkey_tmp)) {
+          tor_log(severity, LD_OR, "%s does not match %s!",
+                  public_fname, loaded_secret_fname);
+          goto err;
+        }
+      } else {
+        tor_assert(split);
+        memcpy(&keypair->pubkey, &pubkey_tmp, sizeof(pubkey_tmp));
+      }
+    }
   }
 
   /* If the secret key is absent and it's not allowed to be, fail. */
@@ -244,7 +303,6 @@ ed_key_init_from_file(const char *fname, uint32_t flags,
 
   /* if it's absent, make a new keypair and save it. */
   if (!have_secret && !found_public) {
-    const int split = !! (flags & INIT_ED_KEY_SPLIT);
     tor_free(keypair);
     keypair = ed_key_new(signing_key, flags, now, lifetime,
                          cert_type, &cert);
@@ -298,6 +356,10 @@ ed_key_init_from_file(const char *fname, uint32_t flags,
              (signing_key || cert->cert_expired)) {
     tor_log(severity, LD_OR, "Can't check certificate");
     bad_cert = 1;
+  } else if (signing_key && cert->signing_key_included &&
+             ! ed25519_pubkey_eq(&signing_key->pubkey, &cert->signing_key)) {
+    tor_log(severity, LD_OR, "Certificate signed by unexpectd key!");
+    bad_cert = 1;
   }
 
   if (bad_cert) {
@@ -480,7 +542,7 @@ load_ed_keys(const or_options_t *options, time_t now)
   {
     uint32_t flags =
       (INIT_ED_KEY_CREATE|INIT_ED_KEY_SPLIT|
-       INIT_ED_KEY_EXTRA_STRONG);
+       INIT_ED_KEY_EXTRA_STRONG|INIT_ED_KEY_NO_REPAIR);
     if (! need_new_signing_key)
       flags |= INIT_ED_KEY_MISSING_SECRET_OK;
     if (! want_new_signing_key)
@@ -515,9 +577,24 @@ load_ed_keys(const or_options_t *options, time_t now)
       sign_signing_key_with_id = id;
   }
 
+  if (master_identity_key &&
+      !ed25519_pubkey_eq(&id->pubkey, &master_identity_key->pubkey)) {
+    FAIL("Identity key on disk does not match key we loaded earlier!");
+  }
+
   if (need_new_signing_key && NULL == sign_signing_key_with_id)
     FAIL("Can't load master key make a new signing key.");
 
+  if (sign_cert) {
+    if (! sign_cert->signing_key_included)
+      FAIL("Loaded a signing cert with no key included!");
+    if (! ed25519_pubkey_eq(&sign_cert->signing_key, &id->pubkey))
+      FAIL("The signing cert we have was not signed with the master key "
+           "we loaded!");
+    if (tor_cert_checksig(sign_cert, &id->pubkey, 0) < 0)
+      FAIL("The signing cert we loaded was not signed correctly!");
+  }
+
   if (want_new_signing_key && sign_signing_key_with_id) {
     uint32_t flags = (INIT_ED_KEY_CREATE|
                       INIT_ED_KEY_REPLACE|
@@ -535,6 +612,10 @@ load_ed_keys(const or_options_t *options, time_t now)
     if (!sign)
       FAIL("Missing signing key");
     use_signing = sign;
+
+    tor_assert(sign_cert->signing_key_included);
+    tor_assert(ed25519_pubkey_eq(&sign_cert->signing_key, &id->pubkey));
+    tor_assert(ed25519_pubkey_eq(&sign_cert->signed_key, &sign->pubkey));
   } else if (want_new_signing_key) {
     static ratelim_t missing_master = RATELIM_INIT(3600);
     log_fn_ratelim(&missing_master, LOG_WARN, LD_OR,

src/or/routerkeys.h

@@ -15,6 +15,7 @@
 #define INIT_ED_KEY_INCLUDE_SIGNING_KEY_IN_CERT (1u<<6)
 #define INIT_ED_KEY_OMIT_SECRET                 (1u<<7)
 #define INIT_ED_KEY_TRY_ENCRYPTED               (1u<<8)
+#define INIT_ED_KEY_NO_REPAIR                   (1u<<9)
 
 struct tor_cert_st;
 ed25519_keypair_t *ed_key_init_from_file(const char *fname, uint32_t flags,

src/or/torcert.c

@@ -181,9 +181,10 @@ tor_cert_get_checkable_sig(ed25519_checkable_t *checkable_out,
   return 0;
 }
 
-/** Validates the signature on <b>cert</b> with <b>pubkey</b> relative to
+/** Validates the signature on <b>cert</b> with <b>pubkey</b> relative to the
- * the current time <b>now</b>.  Return 0 on success, -1 on failure.
+ * current time <b>now</b>.  (If <b>now</b> is 0, do not check the expiration
- * Sets flags in <b>cert</b> as appropriate.
+ * time.) Return 0 on success, -1 on failure.  Sets flags in <b>cert</b> as
+ * appropriate.
  */
 int
 tor_cert_checksig(tor_cert_t *cert,
@@ -192,7 +193,7 @@ tor_cert_checksig(tor_cert_t *cert,
   ed25519_checkable_t checkable;
   int okay;
 
-  if (now > cert->valid_until) {
+  if (now && now > cert->valid_until) {
     cert->cert_expired = 1;
     return -1;
   }