diff options
Diffstat (limited to 'src/util/cert/nss/cert.c')
| -rw-r--r-- | src/util/cert/nss/cert.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/src/util/cert/nss/cert.c b/src/util/cert/nss/cert.c new file mode 100644 index 000000000..a20abf63a --- /dev/null +++ b/src/util/cert/nss/cert.c @@ -0,0 +1,212 @@ + +/* + SSSD - certificate handling utils - NSS version + + Copyright (C) Sumit Bose <sbose@redhat.com> 2015 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "util/util.h" + +#include <cert.h> +#include <base64.h> + +#include "util/crypto/nss/nss_util.h" + +#define NS_CERT_HEADER "-----BEGIN CERTIFICATE-----" +#define NS_CERT_TRAILER "-----END CERTIFICATE-----" +#define NS_CERT_HEADER_LEN ((sizeof NS_CERT_HEADER) - 1) +#define NS_CERT_TRAILER_LEN ((sizeof NS_CERT_TRAILER) - 1) + +errno_t sss_cert_der_to_pem(TALLOC_CTX *mem_ctx, const uint8_t *der_blob, + size_t der_size, char **pem, size_t *pem_size) +{ + + CERTCertDBHandle *handle; + CERTCertificate *cert = NULL; + SECItem der_item; + char *ascii_crlf = NULL; + size_t ascii_crlf_len; + char *ascii_lf = NULL; + char *pem_cert_str = NULL; + int ret; + size_t c; + size_t d; + + /* initialize NSS if needed */ + ret = nspr_nss_init(); + if (ret != EOK) { + DEBUG(SSSDBG_OP_FAILURE, "nspr_nss_init failed.\n"); + return ret; + } + + handle = CERT_GetDefaultCertDB(); + + der_item.len = der_size; + der_item.data = discard_const(der_blob); + + cert = CERT_NewTempCertificate(handle, &der_item, NULL, PR_FALSE, PR_TRUE); + if (cert == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "CERT_NewTempCertificate failed.\n"); + return EINVAL; + } + + ascii_crlf = BTOA_DataToAscii(cert->derCert.data, cert->derCert.len); + if (ascii_crlf == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "BTOA_DataToAscii failed.\n"); + ret = EIO; + goto done; + } + + ascii_crlf_len = strlen(ascii_crlf) + 1; + ascii_lf = talloc_size(mem_ctx, ascii_crlf_len * sizeof(char)); + if (ascii_lf == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "malloc failed.\n"); + ret = ENOMEM; + goto done; + } + + d = 0; + for (c = 0; c < ascii_crlf_len; c++) { + if (ascii_crlf[c] != '\r') { + ascii_lf[d++] = ascii_crlf[c]; + } + } + + pem_cert_str = talloc_asprintf(mem_ctx, "%s\n%s\n%s\n", NS_CERT_HEADER, + ascii_lf, + NS_CERT_TRAILER); + if (pem_cert_str == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "talloc_asprintf failed.\n"); + ret = ENOMEM; + goto done; + } + + if (pem_size != NULL) { + *pem_size = strlen(pem_cert_str); + } + + if (pem != NULL) { + *pem = pem_cert_str; + pem_cert_str = NULL; + } + + ret = EOK; +done: + talloc_free(pem_cert_str); + talloc_free(ascii_lf); + PORT_Free(ascii_crlf); + CERT_DestroyCertificate(cert); + + return ret; +} + +errno_t sss_cert_pem_to_der(TALLOC_CTX *mem_ctx, const char *pem, + uint8_t **_der_blob, size_t *_der_size) +{ + const char *ps; + const char *pe; + size_t pem_len; + uint8_t *der_blob = NULL; + unsigned int der_size; /* unsigned int to match 2nd parameter of + ATOB_AsciiToData */ + CERTCertDBHandle *handle; + CERTCertificate *cert = NULL; + SECItem der_item; + int ret; + char *b64 = NULL; + + /* initialize NSS if needed */ + ret = nspr_nss_init(); + if (ret != EOK) { + DEBUG(SSSDBG_OP_FAILURE, "nspr_nss_init failed.\n"); + return ret; + } + + if (pem == NULL || *pem == '\0') { + return EINVAL; + } + + pem_len = strlen(pem); + if (pem_len <= NS_CERT_HEADER_LEN + NS_CERT_TRAILER_LEN) { + DEBUG(SSSDBG_CRIT_FAILURE, "PEM data too short.\n"); + return EINVAL; + } + + if (strncmp(pem, NS_CERT_HEADER, NS_CERT_HEADER_LEN) != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Wrong PEM header.\n"); + return EINVAL; + } + if (pem[NS_CERT_HEADER_LEN] != '\n') { + DEBUG(SSSDBG_CRIT_FAILURE, "Missing newline in PEM data.\n"); + return EINVAL; + } + + pe = pem + pem_len - NS_CERT_TRAILER_LEN; + if (pem[pem_len - 1] == '\n') { + pe--; + } + if (strncmp(pe, NS_CERT_TRAILER, NS_CERT_TRAILER_LEN) != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Wrong PEM trailer.\n"); + return EINVAL; + } + + ps = pem + NS_CERT_HEADER_LEN + 1; + + b64 = talloc_strndup(mem_ctx, ps, pe - ps); + if(b64 == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "talloc_strndup failed.\n"); + ret = ENOMEM; + goto done; + } + + der_blob = ATOB_AsciiToData(b64, &der_size); + if (der_blob == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "ATOB_AsciiToData failed.\n"); + return EIO; + } + + handle = CERT_GetDefaultCertDB(); + + der_item.len = der_size; + der_item.data = der_blob; + + cert = CERT_NewTempCertificate(handle, &der_item, NULL, PR_FALSE, PR_TRUE); + if (cert == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "CERT_NewTempCertificate failed.\n"); + ret = EINVAL; + goto done; + } + + if (_der_blob != NULL) { + *_der_blob = talloc_memdup(mem_ctx, cert->derCert.data, + cert->derCert.len); + if (*_der_blob == NULL) { + DEBUG(SSSDBG_OP_FAILURE, "talloc_memdup failed.\n"); + ret = ENOMEM; + goto done; + } + } + + if (_der_size != NULL) { + *_der_size = cert->derCert.len; + } +done: + PORT_Free(der_blob); + talloc_free(b64); + CERT_DestroyCertificate(cert); + + return ret; +} |