diff options
Diffstat (limited to 'roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/pem/pem_lib.c')
| -rw-r--r-- | roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/pem/pem_lib.c | 988 |
1 files changed, 988 insertions, 0 deletions
diff --git a/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/pem/pem_lib.c b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/pem/pem_lib.c new file mode 100644 index 000000000..64baf7108 --- /dev/null +++ b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/crypto/pem/pem_lib.c @@ -0,0 +1,988 @@ +/* + * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <stdio.h> +#include "crypto/ctype.h" +#include <string.h> +#include "internal/cryptlib.h" +#include <openssl/buffer.h> +#include <openssl/objects.h> +#include <openssl/evp.h> +#include <openssl/rand.h> +#include <openssl/x509.h> +#include <openssl/pem.h> +#include <openssl/pkcs12.h> +#include "crypto/asn1.h" +#include <openssl/des.h> +#include <openssl/engine.h> + +#define MIN_LENGTH 4 + +static int load_iv(char **fromp, unsigned char *to, int num); +static int check_pem(const char *nm, const char *name); +int pem_check_suffix(const char *pem_str, const char *suffix); + +int PEM_def_callback(char *buf, int num, int rwflag, void *userdata) +{ + int i, min_len; + const char *prompt; + + /* We assume that the user passes a default password as userdata */ + if (userdata) { + i = strlen(userdata); + i = (i > num) ? num : i; + memcpy(buf, userdata, i); + return i; + } + + prompt = EVP_get_pw_prompt(); + if (prompt == NULL) + prompt = "Enter PEM pass phrase:"; + + /* + * rwflag == 0 means decryption + * rwflag == 1 means encryption + * + * We assume that for encryption, we want a minimum length, while for + * decryption, we cannot know any minimum length, so we assume zero. + */ + min_len = rwflag ? MIN_LENGTH : 0; + + i = EVP_read_pw_string_min(buf, min_len, num, prompt, rwflag); + if (i != 0) { + PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD); + memset(buf, 0, (unsigned int)num); + return -1; + } + return strlen(buf); +} + +void PEM_proc_type(char *buf, int type) +{ + const char *str; + char *p = buf + strlen(buf); + + if (type == PEM_TYPE_ENCRYPTED) + str = "ENCRYPTED"; + else if (type == PEM_TYPE_MIC_CLEAR) + str = "MIC-CLEAR"; + else if (type == PEM_TYPE_MIC_ONLY) + str = "MIC-ONLY"; + else + str = "BAD-TYPE"; + + BIO_snprintf(p, PEM_BUFSIZE - (size_t)(p - buf), "Proc-Type: 4,%s\n", str); +} + +void PEM_dek_info(char *buf, const char *type, int len, char *str) +{ + long i; + char *p = buf + strlen(buf); + int j = PEM_BUFSIZE - (size_t)(p - buf), n; + + n = BIO_snprintf(p, j, "DEK-Info: %s,", type); + if (n > 0) { + j -= n; + p += n; + for (i = 0; i < len; i++) { + n = BIO_snprintf(p, j, "%02X", 0xff & str[i]); + if (n <= 0) + return; + j -= n; + p += n; + } + if (j > 1) + strcpy(p, "\n"); + } +} + +#ifndef OPENSSL_NO_STDIO +void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x, + pem_password_cb *cb, void *u) +{ + BIO *b; + void *ret; + + if ((b = BIO_new(BIO_s_file())) == NULL) { + PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB); + return 0; + } + BIO_set_fp(b, fp, BIO_NOCLOSE); + ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u); + BIO_free(b); + return ret; +} +#endif + +static int check_pem(const char *nm, const char *name) +{ + /* Normal matching nm and name */ + if (strcmp(nm, name) == 0) + return 1; + + /* Make PEM_STRING_EVP_PKEY match any private key */ + + if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) { + int slen; + const EVP_PKEY_ASN1_METHOD *ameth; + if (strcmp(nm, PEM_STRING_PKCS8) == 0) + return 1; + if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) + return 1; + slen = pem_check_suffix(nm, "PRIVATE KEY"); + if (slen > 0) { + /* + * NB: ENGINE implementations won't contain a deprecated old + * private key decode function so don't look for them. + */ + ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen); + if (ameth && ameth->old_priv_decode) + return 1; + } + return 0; + } + + if (strcmp(name, PEM_STRING_PARAMETERS) == 0) { + int slen; + const EVP_PKEY_ASN1_METHOD *ameth; + slen = pem_check_suffix(nm, "PARAMETERS"); + if (slen > 0) { + ENGINE *e; + ameth = EVP_PKEY_asn1_find_str(&e, nm, slen); + if (ameth) { + int r; + if (ameth->param_decode) + r = 1; + else + r = 0; +#ifndef OPENSSL_NO_ENGINE + ENGINE_finish(e); +#endif + return r; + } + } + return 0; + } + /* If reading DH parameters handle X9.42 DH format too */ + if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0 + && strcmp(name, PEM_STRING_DHPARAMS) == 0) + return 1; + + /* Permit older strings */ + + if (strcmp(nm, PEM_STRING_X509_OLD) == 0 + && strcmp(name, PEM_STRING_X509) == 0) + return 1; + + if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0 + && strcmp(name, PEM_STRING_X509_REQ) == 0) + return 1; + + /* Allow normal certs to be read as trusted certs */ + if (strcmp(nm, PEM_STRING_X509) == 0 + && strcmp(name, PEM_STRING_X509_TRUSTED) == 0) + return 1; + + if (strcmp(nm, PEM_STRING_X509_OLD) == 0 + && strcmp(name, PEM_STRING_X509_TRUSTED) == 0) + return 1; + + /* Some CAs use PKCS#7 with CERTIFICATE headers */ + if (strcmp(nm, PEM_STRING_X509) == 0 + && strcmp(name, PEM_STRING_PKCS7) == 0) + return 1; + + if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0 + && strcmp(name, PEM_STRING_PKCS7) == 0) + return 1; + +#ifndef OPENSSL_NO_CMS + if (strcmp(nm, PEM_STRING_X509) == 0 + && strcmp(name, PEM_STRING_CMS) == 0) + return 1; + /* Allow CMS to be read from PKCS#7 headers */ + if (strcmp(nm, PEM_STRING_PKCS7) == 0 + && strcmp(name, PEM_STRING_CMS) == 0) + return 1; +#endif + + return 0; +} + +static void pem_free(void *p, unsigned int flags, size_t num) +{ + if (flags & PEM_FLAG_SECURE) + OPENSSL_secure_clear_free(p, num); + else + OPENSSL_free(p); +} + +static void *pem_malloc(int num, unsigned int flags) +{ + return (flags & PEM_FLAG_SECURE) ? OPENSSL_secure_malloc(num) + : OPENSSL_malloc(num); +} + +static int pem_bytes_read_bio_flags(unsigned char **pdata, long *plen, + char **pnm, const char *name, BIO *bp, + pem_password_cb *cb, void *u, + unsigned int flags) +{ + EVP_CIPHER_INFO cipher; + char *nm = NULL, *header = NULL; + unsigned char *data = NULL; + long len = 0; + int ret = 0; + + do { + pem_free(nm, flags, 0); + pem_free(header, flags, 0); + pem_free(data, flags, len); + if (!PEM_read_bio_ex(bp, &nm, &header, &data, &len, flags)) { + if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE) + ERR_add_error_data(2, "Expecting: ", name); + return 0; + } + } while (!check_pem(nm, name)); + if (!PEM_get_EVP_CIPHER_INFO(header, &cipher)) + goto err; + if (!PEM_do_header(&cipher, data, &len, cb, u)) + goto err; + + *pdata = data; + *plen = len; + + if (pnm != NULL) + *pnm = nm; + + ret = 1; + + err: + if (!ret || pnm == NULL) + pem_free(nm, flags, 0); + pem_free(header, flags, 0); + if (!ret) + pem_free(data, flags, len); + return ret; +} + +int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, + const char *name, BIO *bp, pem_password_cb *cb, + void *u) { + return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u, + PEM_FLAG_EAY_COMPATIBLE); +} + +int PEM_bytes_read_bio_secmem(unsigned char **pdata, long *plen, char **pnm, + const char *name, BIO *bp, pem_password_cb *cb, + void *u) { + return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u, + PEM_FLAG_SECURE | PEM_FLAG_EAY_COMPATIBLE); +} + +#ifndef OPENSSL_NO_STDIO +int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp, + void *x, const EVP_CIPHER *enc, unsigned char *kstr, + int klen, pem_password_cb *callback, void *u) +{ + BIO *b; + int ret; + + if ((b = BIO_new(BIO_s_file())) == NULL) { + PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB); + return 0; + } + BIO_set_fp(b, fp, BIO_NOCLOSE); + ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u); + BIO_free(b); + return ret; +} +#endif + +int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp, + void *x, const EVP_CIPHER *enc, unsigned char *kstr, + int klen, pem_password_cb *callback, void *u) +{ + EVP_CIPHER_CTX *ctx = NULL; + int dsize = 0, i = 0, j = 0, ret = 0; + unsigned char *p, *data = NULL; + const char *objstr = NULL; + char buf[PEM_BUFSIZE]; + unsigned char key[EVP_MAX_KEY_LENGTH]; + unsigned char iv[EVP_MAX_IV_LENGTH]; + + if (enc != NULL) { + objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc)); + if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0 + || EVP_CIPHER_iv_length(enc) > (int)sizeof(iv) + /* + * Check "Proc-Type: 4,Encrypted\nDEK-Info: objstr,hex-iv\n" + * fits into buf + */ + || (strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13) + > sizeof(buf)) { + PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER); + goto err; + } + } + + if ((dsize = i2d(x, NULL)) < 0) { + PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB); + dsize = 0; + goto err; + } + /* dsize + 8 bytes are needed */ + /* actually it needs the cipher block size extra... */ + data = OPENSSL_malloc((unsigned int)dsize + 20); + if (data == NULL) { + PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE); + goto err; + } + p = data; + i = i2d(x, &p); + + if (enc != NULL) { + if (kstr == NULL) { + if (callback == NULL) + klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u); + else + klen = (*callback) (buf, PEM_BUFSIZE, 1, u); + if (klen <= 0) { + PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY); + goto err; + } +#ifdef CHARSET_EBCDIC + /* Convert the pass phrase from EBCDIC */ + ebcdic2ascii(buf, buf, klen); +#endif + kstr = (unsigned char *)buf; + } + if (RAND_bytes(iv, EVP_CIPHER_iv_length(enc)) <= 0) /* Generate a salt */ + goto err; + /* + * The 'iv' is used as the iv and as a salt. It is NOT taken from + * the BytesToKey function + */ + if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL)) + goto err; + + if (kstr == (unsigned char *)buf) + OPENSSL_cleanse(buf, PEM_BUFSIZE); + + buf[0] = '\0'; + PEM_proc_type(buf, PEM_TYPE_ENCRYPTED); + PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc), (char *)iv); + /* k=strlen(buf); */ + + ret = 1; + if ((ctx = EVP_CIPHER_CTX_new()) == NULL + || !EVP_EncryptInit_ex(ctx, enc, NULL, key, iv) + || !EVP_EncryptUpdate(ctx, data, &j, data, i) + || !EVP_EncryptFinal_ex(ctx, &(data[j]), &i)) + ret = 0; + if (ret == 0) + goto err; + i += j; + } else { + ret = 1; + buf[0] = '\0'; + } + i = PEM_write_bio(bp, name, buf, data, i); + if (i <= 0) + ret = 0; + err: + OPENSSL_cleanse(key, sizeof(key)); + OPENSSL_cleanse(iv, sizeof(iv)); + EVP_CIPHER_CTX_free(ctx); + OPENSSL_cleanse(buf, PEM_BUFSIZE); + OPENSSL_clear_free(data, (unsigned int)dsize); + return ret; +} + +int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen, + pem_password_cb *callback, void *u) +{ + int ok; + int keylen; + long len = *plen; + int ilen = (int) len; /* EVP_DecryptUpdate etc. take int lengths */ + EVP_CIPHER_CTX *ctx; + unsigned char key[EVP_MAX_KEY_LENGTH]; + char buf[PEM_BUFSIZE]; + +#if LONG_MAX > INT_MAX + /* Check that we did not truncate the length */ + if (len > INT_MAX) { + PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_HEADER_TOO_LONG); + return 0; + } +#endif + + if (cipher->cipher == NULL) + return 1; + if (callback == NULL) + keylen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u); + else + keylen = callback(buf, PEM_BUFSIZE, 0, u); + if (keylen < 0) { + PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ); + return 0; + } +#ifdef CHARSET_EBCDIC + /* Convert the pass phrase from EBCDIC */ + ebcdic2ascii(buf, buf, keylen); +#endif + + if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]), + (unsigned char *)buf, keylen, 1, key, NULL)) + return 0; + + ctx = EVP_CIPHER_CTX_new(); + if (ctx == NULL) + return 0; + + ok = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0])); + if (ok) + ok = EVP_DecryptUpdate(ctx, data, &ilen, data, ilen); + if (ok) { + /* Squirrel away the length of data decrypted so far. */ + *plen = ilen; + ok = EVP_DecryptFinal_ex(ctx, &(data[ilen]), &ilen); + } + if (ok) + *plen += ilen; + else + PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT); + + EVP_CIPHER_CTX_free(ctx); + OPENSSL_cleanse((char *)buf, sizeof(buf)); + OPENSSL_cleanse((char *)key, sizeof(key)); + return ok; +} + +/* + * This implements a very limited PEM header parser that does not support the + * full grammar of rfc1421. In particular, folded headers are not supported, + * nor is additional whitespace. + * + * A robust implementation would make use of a library that turns the headers + * into a BIO from which one folded line is read at a time, and is then split + * into a header label and content. We would then parse the content of the + * headers we care about. This is overkill for just this limited use-case, but + * presumably we also parse rfc822-style headers for S/MIME, so a common + * abstraction might well be more generally useful. + */ +int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher) +{ + static const char ProcType[] = "Proc-Type:"; + static const char ENCRYPTED[] = "ENCRYPTED"; + static const char DEKInfo[] = "DEK-Info:"; + const EVP_CIPHER *enc = NULL; + int ivlen; + char *dekinfostart, c; + + cipher->cipher = NULL; + memset(cipher->iv, 0, sizeof(cipher->iv)); + if ((header == NULL) || (*header == '\0') || (*header == '\n')) + return 1; + + if (strncmp(header, ProcType, sizeof(ProcType)-1) != 0) { + PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE); + return 0; + } + header += sizeof(ProcType)-1; + header += strspn(header, " \t"); + + if (*header++ != '4' || *header++ != ',') + return 0; + header += strspn(header, " \t"); + + /* We expect "ENCRYPTED" followed by optional white-space + line break */ + if (strncmp(header, ENCRYPTED, sizeof(ENCRYPTED)-1) != 0 || + strspn(header+sizeof(ENCRYPTED)-1, " \t\r\n") == 0) { + PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED); + return 0; + } + header += sizeof(ENCRYPTED)-1; + header += strspn(header, " \t\r"); + if (*header++ != '\n') { + PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER); + return 0; + } + + /*- + * https://tools.ietf.org/html/rfc1421#section-4.6.1.3 + * We expect "DEK-Info: algo[,hex-parameters]" + */ + if (strncmp(header, DEKInfo, sizeof(DEKInfo)-1) != 0) { + PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO); + return 0; + } + header += sizeof(DEKInfo)-1; + header += strspn(header, " \t"); + + /* + * DEK-INFO is a comma-separated combination of algorithm name and optional + * parameters. + */ + dekinfostart = header; + header += strcspn(header, " \t,"); + c = *header; + *header = '\0'; + cipher->cipher = enc = EVP_get_cipherbyname(dekinfostart); + *header = c; + header += strspn(header, " \t"); + + if (enc == NULL) { + PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION); + return 0; + } + ivlen = EVP_CIPHER_iv_length(enc); + if (ivlen > 0 && *header++ != ',') { + PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_MISSING_DEK_IV); + return 0; + } else if (ivlen == 0 && *header == ',') { + PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNEXPECTED_DEK_IV); + return 0; + } + + if (!load_iv(&header, cipher->iv, EVP_CIPHER_iv_length(enc))) + return 0; + + return 1; +} + +static int load_iv(char **fromp, unsigned char *to, int num) +{ + int v, i; + char *from; + + from = *fromp; + for (i = 0; i < num; i++) + to[i] = 0; + num *= 2; + for (i = 0; i < num; i++) { + v = OPENSSL_hexchar2int(*from); + if (v < 0) { + PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS); + return 0; + } + from++; + to[i / 2] |= v << (long)((!(i & 1)) * 4); + } + + *fromp = from; + return 1; +} + +#ifndef OPENSSL_NO_STDIO +int PEM_write(FILE *fp, const char *name, const char *header, + const unsigned char *data, long len) +{ + BIO *b; + int ret; + + if ((b = BIO_new(BIO_s_file())) == NULL) { + PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB); + return 0; + } + BIO_set_fp(b, fp, BIO_NOCLOSE); + ret = PEM_write_bio(b, name, header, data, len); + BIO_free(b); + return ret; +} +#endif + +int PEM_write_bio(BIO *bp, const char *name, const char *header, + const unsigned char *data, long len) +{ + int nlen, n, i, j, outl; + unsigned char *buf = NULL; + EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new(); + int reason = ERR_R_BUF_LIB; + int retval = 0; + + if (ctx == NULL) { + reason = ERR_R_MALLOC_FAILURE; + goto err; + } + + EVP_EncodeInit(ctx); + nlen = strlen(name); + + if ((BIO_write(bp, "-----BEGIN ", 11) != 11) || + (BIO_write(bp, name, nlen) != nlen) || + (BIO_write(bp, "-----\n", 6) != 6)) + goto err; + + i = strlen(header); + if (i > 0) { + if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1)) + goto err; + } + + buf = OPENSSL_malloc(PEM_BUFSIZE * 8); + if (buf == NULL) { + reason = ERR_R_MALLOC_FAILURE; + goto err; + } + + i = j = 0; + while (len > 0) { + n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len); + if (!EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n)) + goto err; + if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl)) + goto err; + i += outl; + len -= n; + j += n; + } + EVP_EncodeFinal(ctx, buf, &outl); + if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl)) + goto err; + if ((BIO_write(bp, "-----END ", 9) != 9) || + (BIO_write(bp, name, nlen) != nlen) || + (BIO_write(bp, "-----\n", 6) != 6)) + goto err; + retval = i + outl; + + err: + if (retval == 0) + PEMerr(PEM_F_PEM_WRITE_BIO, reason); + EVP_ENCODE_CTX_free(ctx); + OPENSSL_clear_free(buf, PEM_BUFSIZE * 8); + return retval; +} + +#ifndef OPENSSL_NO_STDIO +int PEM_read(FILE *fp, char **name, char **header, unsigned char **data, + long *len) +{ + BIO *b; + int ret; + + if ((b = BIO_new(BIO_s_file())) == NULL) { + PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB); + return 0; + } + BIO_set_fp(b, fp, BIO_NOCLOSE); + ret = PEM_read_bio(b, name, header, data, len); + BIO_free(b); + return ret; +} +#endif + +/* Some helpers for PEM_read_bio_ex(). */ +static int sanitize_line(char *linebuf, int len, unsigned int flags) +{ + int i; + + if (flags & PEM_FLAG_EAY_COMPATIBLE) { + /* Strip trailing whitespace */ + while ((len >= 0) && (linebuf[len] <= ' ')) + len--; + /* Go back to whitespace before applying uniform line ending. */ + len++; + } else if (flags & PEM_FLAG_ONLY_B64) { + for (i = 0; i < len; ++i) { + if (!ossl_isbase64(linebuf[i]) || linebuf[i] == '\n' + || linebuf[i] == '\r') + break; + } + len = i; + } else { + /* EVP_DecodeBlock strips leading and trailing whitespace, so just strip + * control characters in-place and let everything through. */ + for (i = 0; i < len; ++i) { + if (linebuf[i] == '\n' || linebuf[i] == '\r') + break; + if (ossl_iscntrl(linebuf[i])) + linebuf[i] = ' '; + } + len = i; + } + /* The caller allocated LINESIZE+1, so this is safe. */ + linebuf[len++] = '\n'; + linebuf[len] = '\0'; + return len; +} + +#define LINESIZE 255 +/* Note trailing spaces for begin and end. */ +static const char beginstr[] = "-----BEGIN "; +static const char endstr[] = "-----END "; +static const char tailstr[] = "-----\n"; +#define BEGINLEN ((int)(sizeof(beginstr) - 1)) +#define ENDLEN ((int)(sizeof(endstr) - 1)) +#define TAILLEN ((int)(sizeof(tailstr) - 1)) +static int get_name(BIO *bp, char **name, unsigned int flags) +{ + char *linebuf; + int ret = 0; + int len; + + /* + * Need to hold trailing NUL (accounted for by BIO_gets() and the newline + * that will be added by sanitize_line() (the extra '1'). + */ + linebuf = pem_malloc(LINESIZE + 1, flags); + if (linebuf == NULL) { + PEMerr(PEM_F_GET_NAME, ERR_R_MALLOC_FAILURE); + return 0; + } + + do { + len = BIO_gets(bp, linebuf, LINESIZE); + + if (len <= 0) { + PEMerr(PEM_F_GET_NAME, PEM_R_NO_START_LINE); + goto err; + } + + /* Strip trailing garbage and standardize ending. */ + len = sanitize_line(linebuf, len, flags & ~PEM_FLAG_ONLY_B64); + + /* Allow leading empty or non-matching lines. */ + } while (strncmp(linebuf, beginstr, BEGINLEN) != 0 + || len < TAILLEN + || strncmp(linebuf + len - TAILLEN, tailstr, TAILLEN) != 0); + linebuf[len - TAILLEN] = '\0'; + len = len - BEGINLEN - TAILLEN + 1; + *name = pem_malloc(len, flags); + if (*name == NULL) { + PEMerr(PEM_F_GET_NAME, ERR_R_MALLOC_FAILURE); + goto err; + } + memcpy(*name, linebuf + BEGINLEN, len); + ret = 1; + +err: + pem_free(linebuf, flags, LINESIZE + 1); + return ret; +} + +/* Keep track of how much of a header we've seen. */ +enum header_status { + MAYBE_HEADER, + IN_HEADER, + POST_HEADER +}; + +/** + * Extract the optional PEM header, with details on the type of content and + * any encryption used on the contents, and the bulk of the data from the bio. + * The end of the header is marked by a blank line; if the end-of-input marker + * is reached prior to a blank line, there is no header. + * + * The header and data arguments are BIO** since we may have to swap them + * if there is no header, for efficiency. + * + * We need the name of the PEM-encoded type to verify the end string. + */ +static int get_header_and_data(BIO *bp, BIO **header, BIO **data, char *name, + unsigned int flags) +{ + BIO *tmp = *header; + char *linebuf, *p; + int len, line, ret = 0, end = 0; + /* 0 if not seen (yet), 1 if reading header, 2 if finished header */ + enum header_status got_header = MAYBE_HEADER; + unsigned int flags_mask; + size_t namelen; + + /* Need to hold trailing NUL (accounted for by BIO_gets() and the newline + * that will be added by sanitize_line() (the extra '1'). */ + linebuf = pem_malloc(LINESIZE + 1, flags); + if (linebuf == NULL) { + PEMerr(PEM_F_GET_HEADER_AND_DATA, ERR_R_MALLOC_FAILURE); + return 0; + } + + for (line = 0; ; line++) { + flags_mask = ~0u; + len = BIO_gets(bp, linebuf, LINESIZE); + if (len <= 0) { + PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_SHORT_HEADER); + goto err; + } + + if (got_header == MAYBE_HEADER) { + if (memchr(linebuf, ':', len) != NULL) + got_header = IN_HEADER; + } + if (!strncmp(linebuf, endstr, ENDLEN) || got_header == IN_HEADER) + flags_mask &= ~PEM_FLAG_ONLY_B64; + len = sanitize_line(linebuf, len, flags & flags_mask); + + /* Check for end of header. */ + if (linebuf[0] == '\n') { + if (got_header == POST_HEADER) { + /* Another blank line is an error. */ + PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE); + goto err; + } + got_header = POST_HEADER; + tmp = *data; + continue; + } + + /* Check for end of stream (which means there is no header). */ + if (strncmp(linebuf, endstr, ENDLEN) == 0) { + p = linebuf + ENDLEN; + namelen = strlen(name); + if (strncmp(p, name, namelen) != 0 || + strncmp(p + namelen, tailstr, TAILLEN) != 0) { + PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE); + goto err; + } + if (got_header == MAYBE_HEADER) { + *header = *data; + *data = tmp; + } + break; + } else if (end) { + /* Malformed input; short line not at end of data. */ + PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE); + goto err; + } + /* + * Else, a line of text -- could be header or data; we don't + * know yet. Just pass it through. + */ + if (BIO_puts(tmp, linebuf) < 0) + goto err; + /* + * Only encrypted files need the line length check applied. + */ + if (got_header == POST_HEADER) { + /* 65 includes the trailing newline */ + if (len > 65) + goto err; + if (len < 65) + end = 1; + } + } + + ret = 1; +err: + pem_free(linebuf, flags, LINESIZE + 1); + return ret; +} + +/** + * Read in PEM-formatted data from the given BIO. + * + * By nature of the PEM format, all content must be printable ASCII (except + * for line endings). Other characters are malformed input and will be rejected. + */ +int PEM_read_bio_ex(BIO *bp, char **name_out, char **header, + unsigned char **data, long *len_out, unsigned int flags) +{ + EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new(); + const BIO_METHOD *bmeth; + BIO *headerB = NULL, *dataB = NULL; + char *name = NULL; + int len, taillen, headerlen, ret = 0; + BUF_MEM * buf_mem; + + if (ctx == NULL) { + PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_MALLOC_FAILURE); + return 0; + } + + *len_out = 0; + *name_out = *header = NULL; + *data = NULL; + if ((flags & PEM_FLAG_EAY_COMPATIBLE) && (flags & PEM_FLAG_ONLY_B64)) { + /* These two are mutually incompatible; bail out. */ + PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_PASSED_INVALID_ARGUMENT); + goto end; + } + bmeth = (flags & PEM_FLAG_SECURE) ? BIO_s_secmem() : BIO_s_mem(); + + headerB = BIO_new(bmeth); + dataB = BIO_new(bmeth); + if (headerB == NULL || dataB == NULL) { + PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_MALLOC_FAILURE); + goto end; + } + + if (!get_name(bp, &name, flags)) + goto end; + if (!get_header_and_data(bp, &headerB, &dataB, name, flags)) + goto end; + + EVP_DecodeInit(ctx); + BIO_get_mem_ptr(dataB, &buf_mem); + len = buf_mem->length; + if (EVP_DecodeUpdate(ctx, (unsigned char*)buf_mem->data, &len, + (unsigned char*)buf_mem->data, len) < 0 + || EVP_DecodeFinal(ctx, (unsigned char*)&(buf_mem->data[len]), + &taillen) < 0) { + PEMerr(PEM_F_PEM_READ_BIO_EX, PEM_R_BAD_BASE64_DECODE); + goto end; + } + len += taillen; + buf_mem->length = len; + + /* There was no data in the PEM file; avoid malloc(0). */ + if (len == 0) + goto end; + headerlen = BIO_get_mem_data(headerB, NULL); + *header = pem_malloc(headerlen + 1, flags); + *data = pem_malloc(len, flags); + if (*header == NULL || *data == NULL) { + pem_free(*header, flags, 0); + pem_free(*data, flags, 0); + goto end; + } + BIO_read(headerB, *header, headerlen); + (*header)[headerlen] = '\0'; + BIO_read(dataB, *data, len); + *len_out = len; + *name_out = name; + name = NULL; + ret = 1; + +end: + EVP_ENCODE_CTX_free(ctx); + pem_free(name, flags, 0); + BIO_free(headerB); + BIO_free(dataB); + return ret; +} + +int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data, + long *len) +{ + return PEM_read_bio_ex(bp, name, header, data, len, PEM_FLAG_EAY_COMPATIBLE); +} + +/* + * Check pem string and return prefix length. If for example the pem_str == + * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the + * string "RSA". + */ + +int pem_check_suffix(const char *pem_str, const char *suffix) +{ + int pem_len = strlen(pem_str); + int suffix_len = strlen(suffix); + const char *p; + if (suffix_len + 1 >= pem_len) + return 0; + p = pem_str + pem_len - suffix_len; + if (strcmp(p, suffix)) + return 0; + p--; + if (*p != ' ') + return 0; + return p - pem_str; +} |