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767 lines
19 KiB
767 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* X.509 certificate parser |
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* |
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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|
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#define pr_fmt(fmt) "X.509: "fmt |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/oid_registry.h> |
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#include <crypto/public_key.h> |
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#include "x509_parser.h" |
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#include "x509.asn1.h" |
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#include "x509_akid.asn1.h" |
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|
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struct x509_parse_context { |
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struct x509_certificate *cert; /* Certificate being constructed */ |
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unsigned long data; /* Start of data */ |
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const void *key; /* Key data */ |
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size_t key_size; /* Size of key data */ |
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const void *params; /* Key parameters */ |
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size_t params_size; /* Size of key parameters */ |
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enum OID key_algo; /* Algorithm used by the cert's key */ |
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enum OID last_oid; /* Last OID encountered */ |
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enum OID sig_algo; /* Algorithm used to sign the cert */ |
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u8 o_size; /* Size of organizationName (O) */ |
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u8 cn_size; /* Size of commonName (CN) */ |
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u8 email_size; /* Size of emailAddress */ |
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u16 o_offset; /* Offset of organizationName (O) */ |
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u16 cn_offset; /* Offset of commonName (CN) */ |
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u16 email_offset; /* Offset of emailAddress */ |
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unsigned raw_akid_size; |
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const void *raw_akid; /* Raw authorityKeyId in ASN.1 */ |
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const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */ |
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unsigned akid_raw_issuer_size; |
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}; |
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|
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/* |
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* Free an X.509 certificate |
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*/ |
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void x509_free_certificate(struct x509_certificate *cert) |
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{ |
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if (cert) { |
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public_key_free(cert->pub); |
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public_key_signature_free(cert->sig); |
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kfree(cert->issuer); |
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kfree(cert->subject); |
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kfree(cert->id); |
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kfree(cert->skid); |
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kfree(cert); |
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} |
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} |
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EXPORT_SYMBOL_GPL(x509_free_certificate); |
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|
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/* |
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* Parse an X.509 certificate |
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*/ |
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struct x509_certificate *x509_cert_parse(const void *data, size_t datalen) |
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{ |
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struct x509_certificate *cert; |
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struct x509_parse_context *ctx; |
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struct asymmetric_key_id *kid; |
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long ret; |
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|
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ret = -ENOMEM; |
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cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL); |
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if (!cert) |
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goto error_no_cert; |
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cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL); |
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if (!cert->pub) |
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goto error_no_ctx; |
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cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL); |
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if (!cert->sig) |
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goto error_no_ctx; |
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ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL); |
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if (!ctx) |
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goto error_no_ctx; |
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|
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ctx->cert = cert; |
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ctx->data = (unsigned long)data; |
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|
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/* Attempt to decode the certificate */ |
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ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen); |
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if (ret < 0) |
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goto error_decode; |
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|
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/* Decode the AuthorityKeyIdentifier */ |
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if (ctx->raw_akid) { |
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pr_devel("AKID: %u %*phN\n", |
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ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid); |
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ret = asn1_ber_decoder(&x509_akid_decoder, ctx, |
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ctx->raw_akid, ctx->raw_akid_size); |
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if (ret < 0) { |
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pr_warn("Couldn't decode AuthKeyIdentifier\n"); |
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goto error_decode; |
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} |
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} |
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|
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ret = -ENOMEM; |
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cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL); |
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if (!cert->pub->key) |
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goto error_decode; |
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|
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cert->pub->keylen = ctx->key_size; |
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|
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cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL); |
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if (!cert->pub->params) |
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goto error_decode; |
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|
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cert->pub->paramlen = ctx->params_size; |
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cert->pub->algo = ctx->key_algo; |
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|
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/* Grab the signature bits */ |
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ret = x509_get_sig_params(cert); |
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if (ret < 0) |
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goto error_decode; |
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|
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/* Generate cert issuer + serial number key ID */ |
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kid = asymmetric_key_generate_id(cert->raw_serial, |
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cert->raw_serial_size, |
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cert->raw_issuer, |
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cert->raw_issuer_size); |
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if (IS_ERR(kid)) { |
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ret = PTR_ERR(kid); |
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goto error_decode; |
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} |
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cert->id = kid; |
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|
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/* Detect self-signed certificates */ |
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ret = x509_check_for_self_signed(cert); |
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if (ret < 0) |
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goto error_decode; |
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kfree(ctx); |
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return cert; |
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error_decode: |
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kfree(ctx); |
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error_no_ctx: |
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x509_free_certificate(cert); |
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error_no_cert: |
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return ERR_PTR(ret); |
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} |
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EXPORT_SYMBOL_GPL(x509_cert_parse); |
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|
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/* |
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* Note an OID when we find one for later processing when we know how |
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* to interpret it. |
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*/ |
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int x509_note_OID(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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|
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ctx->last_oid = look_up_OID(value, vlen); |
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if (ctx->last_oid == OID__NR) { |
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char buffer[50]; |
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sprint_oid(value, vlen, buffer, sizeof(buffer)); |
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pr_debug("Unknown OID: [%lu] %s\n", |
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(unsigned long)value - ctx->data, buffer); |
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} |
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return 0; |
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} |
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|
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/* |
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* Save the position of the TBS data so that we can check the signature over it |
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* later. |
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*/ |
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int x509_note_tbs_certificate(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n", |
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hdrlen, tag, (unsigned long)value - ctx->data, vlen); |
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ctx->cert->tbs = value - hdrlen; |
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ctx->cert->tbs_size = vlen + hdrlen; |
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return 0; |
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} |
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|
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/* |
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* Record the algorithm that was used to sign this certificate. |
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*/ |
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int x509_note_sig_algo(void *context, size_t hdrlen, unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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pr_debug("PubKey Algo: %u\n", ctx->last_oid); |
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|
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switch (ctx->last_oid) { |
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case OID_md2WithRSAEncryption: |
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case OID_md3WithRSAEncryption: |
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default: |
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return -ENOPKG; /* Unsupported combination */ |
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|
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case OID_md4WithRSAEncryption: |
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ctx->cert->sig->hash_algo = "md4"; |
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goto rsa_pkcs1; |
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|
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case OID_sha1WithRSAEncryption: |
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ctx->cert->sig->hash_algo = "sha1"; |
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goto rsa_pkcs1; |
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|
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case OID_sha256WithRSAEncryption: |
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ctx->cert->sig->hash_algo = "sha256"; |
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goto rsa_pkcs1; |
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|
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case OID_sha384WithRSAEncryption: |
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ctx->cert->sig->hash_algo = "sha384"; |
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goto rsa_pkcs1; |
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|
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case OID_sha512WithRSAEncryption: |
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ctx->cert->sig->hash_algo = "sha512"; |
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goto rsa_pkcs1; |
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case OID_sha224WithRSAEncryption: |
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ctx->cert->sig->hash_algo = "sha224"; |
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goto rsa_pkcs1; |
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|
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case OID_id_ecdsa_with_sha1: |
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ctx->cert->sig->hash_algo = "sha1"; |
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goto ecdsa; |
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|
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case OID_id_ecdsa_with_sha224: |
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ctx->cert->sig->hash_algo = "sha224"; |
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goto ecdsa; |
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case OID_id_ecdsa_with_sha256: |
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ctx->cert->sig->hash_algo = "sha256"; |
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goto ecdsa; |
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case OID_id_ecdsa_with_sha384: |
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ctx->cert->sig->hash_algo = "sha384"; |
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goto ecdsa; |
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case OID_id_ecdsa_with_sha512: |
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ctx->cert->sig->hash_algo = "sha512"; |
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goto ecdsa; |
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case OID_gost2012Signature256: |
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ctx->cert->sig->hash_algo = "streebog256"; |
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goto ecrdsa; |
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case OID_gost2012Signature512: |
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ctx->cert->sig->hash_algo = "streebog512"; |
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goto ecrdsa; |
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case OID_SM2_with_SM3: |
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ctx->cert->sig->hash_algo = "sm3"; |
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goto sm2; |
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} |
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rsa_pkcs1: |
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ctx->cert->sig->pkey_algo = "rsa"; |
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ctx->cert->sig->encoding = "pkcs1"; |
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ctx->sig_algo = ctx->last_oid; |
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return 0; |
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ecrdsa: |
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ctx->cert->sig->pkey_algo = "ecrdsa"; |
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ctx->cert->sig->encoding = "raw"; |
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ctx->sig_algo = ctx->last_oid; |
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return 0; |
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sm2: |
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ctx->cert->sig->pkey_algo = "sm2"; |
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ctx->cert->sig->encoding = "raw"; |
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ctx->sig_algo = ctx->last_oid; |
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return 0; |
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ecdsa: |
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ctx->cert->sig->pkey_algo = "ecdsa"; |
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ctx->cert->sig->encoding = "x962"; |
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ctx->sig_algo = ctx->last_oid; |
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return 0; |
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} |
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/* |
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* Note the whereabouts and type of the signature. |
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*/ |
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int x509_note_signature(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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pr_debug("Signature: alg=%u, size=%zu\n", ctx->last_oid, vlen); |
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/* |
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* In X.509 certificates, the signature's algorithm is stored in two |
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* places: inside the TBSCertificate (the data that is signed), and |
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* alongside the signature. These *must* match. |
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*/ |
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if (ctx->last_oid != ctx->sig_algo) { |
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pr_warn("signatureAlgorithm (%u) differs from tbsCertificate.signature (%u)\n", |
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ctx->last_oid, ctx->sig_algo); |
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return -EINVAL; |
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} |
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if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 || |
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strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0 || |
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strcmp(ctx->cert->sig->pkey_algo, "sm2") == 0 || |
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strcmp(ctx->cert->sig->pkey_algo, "ecdsa") == 0) { |
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/* Discard the BIT STRING metadata */ |
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if (vlen < 1 || *(const u8 *)value != 0) |
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return -EBADMSG; |
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value++; |
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vlen--; |
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} |
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ctx->cert->raw_sig = value; |
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ctx->cert->raw_sig_size = vlen; |
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return 0; |
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} |
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/* |
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* Note the certificate serial number |
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*/ |
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int x509_note_serial(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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ctx->cert->raw_serial = value; |
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ctx->cert->raw_serial_size = vlen; |
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return 0; |
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} |
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/* |
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* Note some of the name segments from which we'll fabricate a name. |
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*/ |
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int x509_extract_name_segment(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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|
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switch (ctx->last_oid) { |
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case OID_commonName: |
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ctx->cn_size = vlen; |
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ctx->cn_offset = (unsigned long)value - ctx->data; |
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break; |
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case OID_organizationName: |
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ctx->o_size = vlen; |
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ctx->o_offset = (unsigned long)value - ctx->data; |
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break; |
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case OID_email_address: |
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ctx->email_size = vlen; |
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ctx->email_offset = (unsigned long)value - ctx->data; |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
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/* |
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* Fabricate and save the issuer and subject names |
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*/ |
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static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen, |
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unsigned char tag, |
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char **_name, size_t vlen) |
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{ |
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const void *name, *data = (const void *)ctx->data; |
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size_t namesize; |
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char *buffer; |
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|
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if (*_name) |
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return -EINVAL; |
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/* Empty name string if no material */ |
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if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) { |
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buffer = kmalloc(1, GFP_KERNEL); |
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if (!buffer) |
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return -ENOMEM; |
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buffer[0] = 0; |
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goto done; |
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} |
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if (ctx->cn_size && ctx->o_size) { |
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/* Consider combining O and CN, but use only the CN if it is |
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* prefixed by the O, or a significant portion thereof. |
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*/ |
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namesize = ctx->cn_size; |
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name = data + ctx->cn_offset; |
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if (ctx->cn_size >= ctx->o_size && |
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memcmp(data + ctx->cn_offset, data + ctx->o_offset, |
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ctx->o_size) == 0) |
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goto single_component; |
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if (ctx->cn_size >= 7 && |
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ctx->o_size >= 7 && |
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memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0) |
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goto single_component; |
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buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1, |
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GFP_KERNEL); |
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if (!buffer) |
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return -ENOMEM; |
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memcpy(buffer, |
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data + ctx->o_offset, ctx->o_size); |
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buffer[ctx->o_size + 0] = ':'; |
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buffer[ctx->o_size + 1] = ' '; |
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memcpy(buffer + ctx->o_size + 2, |
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data + ctx->cn_offset, ctx->cn_size); |
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buffer[ctx->o_size + 2 + ctx->cn_size] = 0; |
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goto done; |
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|
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} else if (ctx->cn_size) { |
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namesize = ctx->cn_size; |
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name = data + ctx->cn_offset; |
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} else if (ctx->o_size) { |
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namesize = ctx->o_size; |
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name = data + ctx->o_offset; |
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} else { |
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namesize = ctx->email_size; |
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name = data + ctx->email_offset; |
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} |
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single_component: |
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buffer = kmalloc(namesize + 1, GFP_KERNEL); |
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if (!buffer) |
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return -ENOMEM; |
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memcpy(buffer, name, namesize); |
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buffer[namesize] = 0; |
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done: |
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*_name = buffer; |
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ctx->cn_size = 0; |
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ctx->o_size = 0; |
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ctx->email_size = 0; |
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return 0; |
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} |
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int x509_note_issuer(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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struct asymmetric_key_id *kid; |
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|
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ctx->cert->raw_issuer = value; |
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ctx->cert->raw_issuer_size = vlen; |
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|
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if (!ctx->cert->sig->auth_ids[2]) { |
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kid = asymmetric_key_generate_id(value, vlen, "", 0); |
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if (IS_ERR(kid)) |
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return PTR_ERR(kid); |
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ctx->cert->sig->auth_ids[2] = kid; |
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} |
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return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen); |
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} |
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int x509_note_subject(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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ctx->cert->raw_subject = value; |
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ctx->cert->raw_subject_size = vlen; |
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return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen); |
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} |
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|
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/* |
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* Extract the parameters for the public key |
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*/ |
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int x509_note_params(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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|
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/* |
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* AlgorithmIdentifier is used three times in the x509, we should skip |
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* first and ignore third, using second one which is after subject and |
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* before subjectPublicKey. |
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*/ |
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if (!ctx->cert->raw_subject || ctx->key) |
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return 0; |
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ctx->params = value - hdrlen; |
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ctx->params_size = vlen + hdrlen; |
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return 0; |
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} |
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|
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/* |
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* Extract the data for the public key algorithm |
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*/ |
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int x509_extract_key_data(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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enum OID oid; |
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|
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ctx->key_algo = ctx->last_oid; |
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switch (ctx->last_oid) { |
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case OID_rsaEncryption: |
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ctx->cert->pub->pkey_algo = "rsa"; |
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break; |
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case OID_gost2012PKey256: |
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case OID_gost2012PKey512: |
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ctx->cert->pub->pkey_algo = "ecrdsa"; |
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break; |
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case OID_sm2: |
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ctx->cert->pub->pkey_algo = "sm2"; |
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break; |
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case OID_id_ecPublicKey: |
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if (parse_OID(ctx->params, ctx->params_size, &oid) != 0) |
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return -EBADMSG; |
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|
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switch (oid) { |
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case OID_sm2: |
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ctx->cert->pub->pkey_algo = "sm2"; |
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break; |
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case OID_id_prime192v1: |
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ctx->cert->pub->pkey_algo = "ecdsa-nist-p192"; |
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break; |
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case OID_id_prime256v1: |
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ctx->cert->pub->pkey_algo = "ecdsa-nist-p256"; |
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break; |
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case OID_id_ansip384r1: |
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ctx->cert->pub->pkey_algo = "ecdsa-nist-p384"; |
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break; |
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default: |
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return -ENOPKG; |
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} |
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break; |
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default: |
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return -ENOPKG; |
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} |
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|
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/* Discard the BIT STRING metadata */ |
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if (vlen < 1 || *(const u8 *)value != 0) |
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return -EBADMSG; |
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ctx->key = value + 1; |
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ctx->key_size = vlen - 1; |
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return 0; |
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} |
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|
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/* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */ |
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#define SEQ_TAG_KEYID (ASN1_CONT << 6) |
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|
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/* |
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* Process certificate extensions that are used to qualify the certificate. |
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*/ |
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int x509_process_extension(void *context, size_t hdrlen, |
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unsigned char tag, |
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const void *value, size_t vlen) |
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{ |
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struct x509_parse_context *ctx = context; |
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struct asymmetric_key_id *kid; |
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const unsigned char *v = value; |
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|
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pr_debug("Extension: %u\n", ctx->last_oid); |
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|
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if (ctx->last_oid == OID_subjectKeyIdentifier) { |
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/* Get hold of the key fingerprint */ |
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if (ctx->cert->skid || vlen < 3) |
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return -EBADMSG; |
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if (v[0] != ASN1_OTS || v[1] != vlen - 2) |
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return -EBADMSG; |
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v += 2; |
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vlen -= 2; |
|
|
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ctx->cert->raw_skid_size = vlen; |
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ctx->cert->raw_skid = v; |
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kid = asymmetric_key_generate_id(v, vlen, "", 0); |
|
if (IS_ERR(kid)) |
|
return PTR_ERR(kid); |
|
ctx->cert->skid = kid; |
|
pr_debug("subjkeyid %*phN\n", kid->len, kid->data); |
|
return 0; |
|
} |
|
|
|
if (ctx->last_oid == OID_authorityKeyIdentifier) { |
|
/* Get hold of the CA key fingerprint */ |
|
ctx->raw_akid = v; |
|
ctx->raw_akid_size = vlen; |
|
return 0; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* x509_decode_time - Decode an X.509 time ASN.1 object |
|
* @_t: The time to fill in |
|
* @hdrlen: The length of the object header |
|
* @tag: The object tag |
|
* @value: The object value |
|
* @vlen: The size of the object value |
|
* |
|
* Decode an ASN.1 universal time or generalised time field into a struct the |
|
* kernel can handle and check it for validity. The time is decoded thus: |
|
* |
|
* [RFC5280 §4.1.2.5] |
|
* CAs conforming to this profile MUST always encode certificate validity |
|
* dates through the year 2049 as UTCTime; certificate validity dates in |
|
* 2050 or later MUST be encoded as GeneralizedTime. Conforming |
|
* applications MUST be able to process validity dates that are encoded in |
|
* either UTCTime or GeneralizedTime. |
|
*/ |
|
int x509_decode_time(time64_t *_t, size_t hdrlen, |
|
unsigned char tag, |
|
const unsigned char *value, size_t vlen) |
|
{ |
|
static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30, |
|
31, 31, 30, 31, 30, 31 }; |
|
const unsigned char *p = value; |
|
unsigned year, mon, day, hour, min, sec, mon_len; |
|
|
|
#define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; }) |
|
#define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; }) |
|
|
|
if (tag == ASN1_UNITIM) { |
|
/* UTCTime: YYMMDDHHMMSSZ */ |
|
if (vlen != 13) |
|
goto unsupported_time; |
|
year = DD2bin(p); |
|
if (year >= 50) |
|
year += 1900; |
|
else |
|
year += 2000; |
|
} else if (tag == ASN1_GENTIM) { |
|
/* GenTime: YYYYMMDDHHMMSSZ */ |
|
if (vlen != 15) |
|
goto unsupported_time; |
|
year = DD2bin(p) * 100 + DD2bin(p); |
|
if (year >= 1950 && year <= 2049) |
|
goto invalid_time; |
|
} else { |
|
goto unsupported_time; |
|
} |
|
|
|
mon = DD2bin(p); |
|
day = DD2bin(p); |
|
hour = DD2bin(p); |
|
min = DD2bin(p); |
|
sec = DD2bin(p); |
|
|
|
if (*p != 'Z') |
|
goto unsupported_time; |
|
|
|
if (year < 1970 || |
|
mon < 1 || mon > 12) |
|
goto invalid_time; |
|
|
|
mon_len = month_lengths[mon - 1]; |
|
if (mon == 2) { |
|
if (year % 4 == 0) { |
|
mon_len = 29; |
|
if (year % 100 == 0) { |
|
mon_len = 28; |
|
if (year % 400 == 0) |
|
mon_len = 29; |
|
} |
|
} |
|
} |
|
|
|
if (day < 1 || day > mon_len || |
|
hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */ |
|
min > 59 || |
|
sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */ |
|
goto invalid_time; |
|
|
|
*_t = mktime64(year, mon, day, hour, min, sec); |
|
return 0; |
|
|
|
unsupported_time: |
|
pr_debug("Got unsupported time [tag %02x]: '%*phN'\n", |
|
tag, (int)vlen, value); |
|
return -EBADMSG; |
|
invalid_time: |
|
pr_debug("Got invalid time [tag %02x]: '%*phN'\n", |
|
tag, (int)vlen, value); |
|
return -EBADMSG; |
|
} |
|
EXPORT_SYMBOL_GPL(x509_decode_time); |
|
|
|
int x509_note_not_before(void *context, size_t hdrlen, |
|
unsigned char tag, |
|
const void *value, size_t vlen) |
|
{ |
|
struct x509_parse_context *ctx = context; |
|
return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen); |
|
} |
|
|
|
int x509_note_not_after(void *context, size_t hdrlen, |
|
unsigned char tag, |
|
const void *value, size_t vlen) |
|
{ |
|
struct x509_parse_context *ctx = context; |
|
return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen); |
|
} |
|
|
|
/* |
|
* Note a key identifier-based AuthorityKeyIdentifier |
|
*/ |
|
int x509_akid_note_kid(void *context, size_t hdrlen, |
|
unsigned char tag, |
|
const void *value, size_t vlen) |
|
{ |
|
struct x509_parse_context *ctx = context; |
|
struct asymmetric_key_id *kid; |
|
|
|
pr_debug("AKID: keyid: %*phN\n", (int)vlen, value); |
|
|
|
if (ctx->cert->sig->auth_ids[1]) |
|
return 0; |
|
|
|
kid = asymmetric_key_generate_id(value, vlen, "", 0); |
|
if (IS_ERR(kid)) |
|
return PTR_ERR(kid); |
|
pr_debug("authkeyid %*phN\n", kid->len, kid->data); |
|
ctx->cert->sig->auth_ids[1] = kid; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Note a directoryName in an AuthorityKeyIdentifier |
|
*/ |
|
int x509_akid_note_name(void *context, size_t hdrlen, |
|
unsigned char tag, |
|
const void *value, size_t vlen) |
|
{ |
|
struct x509_parse_context *ctx = context; |
|
|
|
pr_debug("AKID: name: %*phN\n", (int)vlen, value); |
|
|
|
ctx->akid_raw_issuer = value; |
|
ctx->akid_raw_issuer_size = vlen; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Note a serial number in an AuthorityKeyIdentifier |
|
*/ |
|
int x509_akid_note_serial(void *context, size_t hdrlen, |
|
unsigned char tag, |
|
const void *value, size_t vlen) |
|
{ |
|
struct x509_parse_context *ctx = context; |
|
struct asymmetric_key_id *kid; |
|
|
|
pr_debug("AKID: serial: %*phN\n", (int)vlen, value); |
|
|
|
if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0]) |
|
return 0; |
|
|
|
kid = asymmetric_key_generate_id(value, |
|
vlen, |
|
ctx->akid_raw_issuer, |
|
ctx->akid_raw_issuer_size); |
|
if (IS_ERR(kid)) |
|
return PTR_ERR(kid); |
|
|
|
pr_debug("authkeyid %*phN\n", kid->len, kid->data); |
|
ctx->cert->sig->auth_ids[0] = kid; |
|
return 0; |
|
}
|
|
|