188 lines
3.6 KiB
C
188 lines
3.6 KiB
C
/*
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* ssl_init.c Common OpenSSL initialization code for the various
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* programs which use it.
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*
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* Moved from ntpd/ntp_crypto.c crypto_setup()
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <ctype.h>
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#include <ntp.h>
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#include <ntp_debug.h>
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#include <lib_strbuf.h>
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#ifdef OPENSSL
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#include "openssl/err.h"
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#include "openssl/evp.h"
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void atexit_ssl_cleanup(void);
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int ssl_init_done;
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void
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ssl_init(void)
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{
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init_lib();
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if (ssl_init_done)
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return;
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ERR_load_crypto_strings();
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OpenSSL_add_all_algorithms();
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atexit(&atexit_ssl_cleanup);
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ssl_init_done = TRUE;
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}
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void
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atexit_ssl_cleanup(void)
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{
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if (!ssl_init_done)
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return;
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ssl_init_done = FALSE;
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EVP_cleanup();
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ERR_free_strings();
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}
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void
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ssl_check_version(void)
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{
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if ((SSLeay() ^ OPENSSL_VERSION_NUMBER) & ~0xff0L) {
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msyslog(LOG_WARNING,
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"OpenSSL version mismatch. Built against %lx, you have %lx",
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(u_long)OPENSSL_VERSION_NUMBER, SSLeay());
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fprintf(stderr,
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"OpenSSL version mismatch. Built against %lx, you have %lx\n",
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(u_long)OPENSSL_VERSION_NUMBER, SSLeay());
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}
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INIT_SSL();
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}
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#endif /* OPENSSL */
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/*
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* keytype_from_text returns OpenSSL NID for digest by name, and
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* optionally the associated digest length.
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*
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* Used by ntpd authreadkeys(), ntpq and ntpdc keytype()
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*/
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int
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keytype_from_text(
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const char *text,
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size_t *pdigest_len
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)
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{
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int key_type;
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u_int digest_len;
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#ifdef OPENSSL
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const u_long max_digest_len = MAX_MAC_LEN - sizeof(keyid_t);
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u_char digest[EVP_MAX_MD_SIZE];
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char * upcased;
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char * pch;
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EVP_MD_CTX ctx;
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/*
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* OpenSSL digest short names are capitalized, so uppercase the
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* digest name before passing to OBJ_sn2nid(). If it is not
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* recognized but begins with 'M' use NID_md5 to be consistent
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* with past behavior.
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*/
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INIT_SSL();
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LIB_GETBUF(upcased);
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strlcpy(upcased, text, LIB_BUFLENGTH);
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for (pch = upcased; '\0' != *pch; pch++)
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*pch = (char)toupper((unsigned char)*pch);
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key_type = OBJ_sn2nid(upcased);
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#else
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key_type = 0;
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#endif
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if (!key_type && 'm' == tolower((unsigned char)text[0]))
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key_type = NID_md5;
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if (!key_type)
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return 0;
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if (NULL != pdigest_len) {
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#ifdef OPENSSL
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EVP_DigestInit(&ctx, EVP_get_digestbynid(key_type));
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EVP_DigestFinal(&ctx, digest, &digest_len);
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if (digest_len > max_digest_len) {
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fprintf(stderr,
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"key type %s %u octet digests are too big, max %lu\n",
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keytype_name(key_type), digest_len,
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max_digest_len);
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msyslog(LOG_ERR,
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"key type %s %u octet digests are too big, max %lu",
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keytype_name(key_type), digest_len,
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max_digest_len);
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return 0;
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}
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#else
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digest_len = 16;
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#endif
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*pdigest_len = digest_len;
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}
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return key_type;
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}
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/*
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* keytype_name returns OpenSSL short name for digest by NID.
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*
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* Used by ntpq and ntpdc keytype()
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*/
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const char *
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keytype_name(
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int nid
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)
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{
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static const char unknown_type[] = "(unknown key type)";
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const char *name;
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#ifdef OPENSSL
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INIT_SSL();
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name = OBJ_nid2sn(nid);
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if (NULL == name)
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name = unknown_type;
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#else /* !OPENSSL follows */
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if (NID_md5 == nid)
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name = "MD5";
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else
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name = unknown_type;
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#endif
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return name;
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}
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/*
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* Use getpassphrase() if configure.ac detected it, as Suns that
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* have it truncate the password in getpass() to 8 characters.
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*/
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#ifdef HAVE_GETPASSPHRASE
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# define getpass(str) getpassphrase(str)
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#endif
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/*
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* getpass_keytype() -- shared between ntpq and ntpdc, only vaguely
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* related to the rest of ssl_init.c.
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*/
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char *
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getpass_keytype(
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int keytype
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)
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{
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char pass_prompt[64 + 11 + 1]; /* 11 for " Password: " */
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snprintf(pass_prompt, sizeof(pass_prompt),
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"%.64s Password: ", keytype_name(keytype));
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return getpass(pass_prompt);
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}
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