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SSH cert sign: check OpenSSL return code #446

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merged 2 commits into from
Jan 10, 2025
Merged

SSH cert sign: check OpenSSL return code #446

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SSH cert sign: check OpenSSL return code
aveenismail Jan 8, 2025
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Githubactions: Update actions version
aveenismail Jan 9, 2025
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25 changes: 17 additions & 8 deletions src/commands.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3098,12 +3098,19 @@ int yh_com_sign_ssh_certificate(yubihsm_context *ctx, Argument *argv,
uint8_t data[YH_MSG_BUF_SIZE + 1024] = {0};
size_t response_len = sizeof(data);

if (argv[4].len != (4 + 256)) { // 4 bytes timestamp + 256 byte signature
fprintf(stderr, "Failed to sign ssh certificate: %s\n",
if (argv[4].len > YH_MSG_BUF_SIZE) {
fprintf(stderr, "Failed to sign ssh certificate: %s. Data too long\n",
yh_strerror(YHR_BUFFER_TOO_SMALL));
return -1;
}

const size_t certdata_offset = 4 + 256; // 4 bytes timestamp + 256 byte signature
if(argv[4].len < certdata_offset) {
fprintf(stderr, "Failed to sign ssh certificate: %s. Data too short.\n",
yh_strerror(YHR_WRONG_LENGTH));
return -1;
}

memcpy(data, argv[4].x, argv[4].len);
response_len -= argv[4].len;

Expand All @@ -3129,14 +3136,16 @@ int yh_com_sign_ssh_certificate(yubihsm_context *ctx, Argument *argv,
}
bio = BIO_push(b64, bio);

int cert_len = argv[4].len - certdata_offset + response_len;
BUF_MEM *bufferPtr = 0;

(void) BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
(void) BIO_write(bio, data + 4 + 256,
argv[4].len + response_len - 4 -
256); // TODO(adma): FIXME, unmagify
(void) BIO_flush(bio);
(void) BIO_get_mem_ptr(bio, &bufferPtr);
BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
if (BIO_write(bio, data + certdata_offset, cert_len) != cert_len) {
fprintf(stderr, "Failed to write SSH certificate.\n");
return -1;
}
BIO_flush(bio);
BIO_get_mem_ptr(bio, &bufferPtr);

const char *ssh_cert_str =
"[email protected] "; // TODO(adma): ECDSA
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