wg: fix removing preshared keys
Also clean up related logic quite a bit and add unit tests. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
bc1f6be5db
commit
30cf5eb883
124
src/config.c
124
src/config.c
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@ -105,11 +105,59 @@ static inline bool parse_key(uint8_t key[static WG_KEY_LEN], const char *value)
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{
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if (!key_from_base64(key, value)) {
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fprintf(stderr, "Key is not the correct length or format: `%s'\n", value);
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memset(key, 0, WG_KEY_LEN);
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return false;
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}
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return true;
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}
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static bool parse_keyfile(uint8_t key[static WG_KEY_LEN], const char *path)
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{
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FILE *f;
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int c;
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char dst[WG_KEY_LEN_BASE64];
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bool ret = false;
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f = fopen(path, "r");
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if (!f) {
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perror("fopen");
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return false;
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}
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if (fread(dst, WG_KEY_LEN_BASE64 - 1, 1, f) != 1) {
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if (errno) {
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perror("fread");
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goto out;
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}
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/* If we're at the end and we didn't read anything, we're /dev/null or an empty file. */
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if (!ferror(f) && feof(f) && !ftell(f)) {
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memset(key, 0, WG_KEY_LEN);
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ret = true;
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goto out;
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}
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fprintf(stderr, "Invalid length key in key file\n");
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goto out;
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}
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dst[WG_KEY_LEN_BASE64 - 1] = '\0';
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while ((c = getc(f)) != EOF) {
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if (!isspace(c)) {
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fprintf(stderr, "Found trailing character in key file: `%c'\n", c);
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goto out;
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}
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}
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if (ferror(f) && errno) {
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perror("getc");
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goto out;
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}
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ret = parse_key(key, dst);
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out:
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fclose(f);
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return ret;
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}
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static inline bool parse_ip(struct wgallowedip *allowedip, const char *value)
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{
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allowedip->family = AF_UNSPEC;
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@ -335,9 +383,7 @@ static bool process_line(struct config_ctx *ctx, const char *line)
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ret = parse_fwmark(&ctx->device->fwmark, &ctx->device->flags, value);
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else if (key_match("PrivateKey")) {
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ret = parse_key(ctx->device->private_key, value);
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if (!ret)
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memset(ctx->device->private_key, 0, WG_KEY_LEN);
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else
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if (ret)
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ctx->device->flags |= WGDEVICE_HAS_PRIVATE_KEY;
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} else
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goto error;
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@ -354,9 +400,7 @@ static bool process_line(struct config_ctx *ctx, const char *line)
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ret = parse_persistent_keepalive(&ctx->last_peer->persistent_keepalive_interval, &ctx->last_peer->flags, value);
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else if (key_match("PresharedKey")) {
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ret = parse_key(ctx->last_peer->preshared_key, value);
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if (!ret)
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memset(ctx->last_peer->preshared_key, 0, WG_KEY_LEN);
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else if (!key_is_zero(ctx->last_peer->preshared_key))
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if (ret)
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ctx->last_peer->flags |= WGPEER_HAS_PRESHARED_KEY;
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} else
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goto error;
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@ -429,54 +473,6 @@ err:
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return NULL;
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}
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static bool read_keyfile(char dst[WG_KEY_LEN_BASE64], const char *path)
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{
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FILE *f;
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int c;
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bool ret = false;
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f = fopen(path, "r");
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if (!f) {
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perror("fopen");
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return false;
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}
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if (fread(dst, WG_KEY_LEN_BASE64 - 1, 1, f) != 1) {
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if (errno) {
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perror("fread");
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goto out;
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}
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/* If we're at the end and we didn't read anything, we're /dev/null. */
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if (!ferror(f) && feof(f) && !ftell(f)) {
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static const uint8_t zeros[WG_KEY_LEN] = { 0 };
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key_to_base64(dst, zeros);
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ret = true;
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goto out;
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}
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fprintf(stderr, "Invalid length key in key file\n");
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goto out;
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}
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dst[WG_KEY_LEN_BASE64 - 1] = '\0';
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while ((c = getc(f)) != EOF) {
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if (!isspace(c)) {
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fprintf(stderr, "Found trailing character in key file: `%c'\n", c);
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goto out;
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}
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}
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if (ferror(f) && errno) {
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perror("getc");
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goto out;
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}
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ret = true;
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out:
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fclose(f);
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return ret;
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}
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static char *strip_spaces(const char *in)
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{
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char *out;
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@ -517,14 +513,9 @@ struct wgdevice *config_read_cmd(char *argv[], int argc)
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argv += 2;
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argc -= 2;
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} else if (!strcmp(argv[0], "private-key") && argc >= 2 && !peer) {
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char key_line[WG_KEY_LEN_BASE64];
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if (read_keyfile(key_line, argv[1])) {
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if (!parse_key(device->private_key, key_line))
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goto error;
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device->flags |= WGDEVICE_HAS_PRIVATE_KEY;
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} else
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if (!parse_keyfile(device->private_key, argv[1]))
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goto error;
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device->flags |= WGDEVICE_HAS_PRIVATE_KEY;
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argv += 2;
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argc -= 2;
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} else if (!strcmp(argv[0], "peer") && argc >= 2) {
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@ -542,6 +533,7 @@ struct wgdevice *config_read_cmd(char *argv[], int argc)
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peer = new_peer;
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if (!parse_key(peer->public_key, argv[1]))
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goto error;
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peer->flags |= WGPEER_HAS_PUBLIC_KEY;
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argv += 2;
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argc -= 2;
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} else if (!strcmp(argv[0], "remove") && argc >= 1 && peer) {
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@ -571,15 +563,9 @@ struct wgdevice *config_read_cmd(char *argv[], int argc)
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argv += 2;
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argc -= 2;
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} else if (!strcmp(argv[0], "preshared-key") && argc >= 2 && peer) {
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char key_line[WG_KEY_LEN_BASE64];
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if (read_keyfile(key_line, argv[1])) {
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if (!parse_key(peer->preshared_key, key_line))
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goto error;
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if (!key_is_zero(peer->preshared_key))
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peer->flags |= WGPEER_HAS_PRESHARED_KEY;
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} else
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if (!parse_keyfile(peer->preshared_key, argv[1]))
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goto error;
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peer->flags |= WGPEER_HAS_PRESHARED_KEY;
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argv += 2;
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argc -= 2;
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} else {
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