diff options
Diffstat (limited to 'libcurl/src/lib/curl_sasl.c')
| -rw-r--r-- | libcurl/src/lib/curl_sasl.c | 1667 |
1 files changed, 1667 insertions, 0 deletions
diff --git a/libcurl/src/lib/curl_sasl.c b/libcurl/src/lib/curl_sasl.c new file mode 100644 index 0000000..86a4af0 --- /dev/null +++ b/libcurl/src/lib/curl_sasl.c @@ -0,0 +1,1667 @@ +/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2012 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * RFC2195 CRAM-MD5 authentication
+ * RFC2617 Basic and Digest Access Authentication
+ * RFC2831 DIGEST-MD5 authentication
+ * RFC4422 Simple Authentication and Security Layer (SASL)
+ * RFC4616 PLAIN authentication
+ * RFC6749 OAuth 2.0 Authorization Framework
+ * Draft LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#include <curl/curl.h>
+#include "urldata.h"
+
+#include "curl_base64.h"
+#include "curl_md5.h"
+#include "vtls/vtls.h"
+#include "curl_hmac.h"
+#include "curl_sasl.h"
+#include "warnless.h"
+#include "strtok.h"
+#include "strequal.h"
+#include "rawstr.h"
+#include "sendf.h"
+#include "non-ascii.h" /* included for Curl_convert_... prototypes */
+#include "curl_printf.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/* Supported mechanisms */
+const struct {
+ const char *name; /* Name */
+ size_t len; /* Name length */
+ unsigned int bit; /* Flag bit */
+} mechtable[] = {
+ { "LOGIN", 5, SASL_MECH_LOGIN },
+ { "PLAIN", 5, SASL_MECH_PLAIN },
+ { "CRAM-MD5", 8, SASL_MECH_CRAM_MD5 },
+ { "DIGEST-MD5", 10, SASL_MECH_DIGEST_MD5 },
+ { "GSSAPI", 6, SASL_MECH_GSSAPI },
+ { "EXTERNAL", 8, SASL_MECH_EXTERNAL },
+ { "NTLM", 4, SASL_MECH_NTLM },
+ { "XOAUTH2", 7, SASL_MECH_XOAUTH2 },
+ { ZERO_NULL, 0, 0 }
+};
+
+#if !defined(CURL_DISABLE_CRYPTO_AUTH) && !defined(USE_WINDOWS_SSPI)
+#define DIGEST_QOP_VALUE_AUTH (1 << 0)
+#define DIGEST_QOP_VALUE_AUTH_INT (1 << 1)
+#define DIGEST_QOP_VALUE_AUTH_CONF (1 << 2)
+
+#define DIGEST_QOP_VALUE_STRING_AUTH "auth"
+#define DIGEST_QOP_VALUE_STRING_AUTH_INT "auth-int"
+#define DIGEST_QOP_VALUE_STRING_AUTH_CONF "auth-conf"
+
+#define DIGEST_MAX_VALUE_LENGTH 256
+#define DIGEST_MAX_CONTENT_LENGTH 1024
+
+/* The CURL_OUTPUT_DIGEST_CONV macro below is for non-ASCII machines.
+ It converts digest text to ASCII so the MD5 will be correct for
+ what ultimately goes over the network.
+*/
+#define CURL_OUTPUT_DIGEST_CONV(a, b) \
+ result = Curl_convert_to_network(a, (char *)b, strlen((const char*)b)); \
+ if(result) { \
+ free(b); \
+ return result; \
+ }
+
+/*
+ * Returns 0 on success and then the buffers are filled in fine.
+ *
+ * Non-zero means failure to parse.
+ */
+static int sasl_digest_get_pair(const char *str, char *value, char *content,
+ const char **endptr)
+{
+ int c;
+ bool starts_with_quote = FALSE;
+ bool escape = FALSE;
+
+ for(c = DIGEST_MAX_VALUE_LENGTH - 1; (*str && (*str != '=') && c--); )
+ *value++ = *str++;
+ *value = 0;
+
+ if('=' != *str++)
+ /* eek, no match */
+ return 1;
+
+ if('\"' == *str) {
+ /* this starts with a quote so it must end with one as well! */
+ str++;
+ starts_with_quote = TRUE;
+ }
+
+ for(c = DIGEST_MAX_CONTENT_LENGTH - 1; *str && c--; str++) {
+ switch(*str) {
+ case '\\':
+ if(!escape) {
+ /* possibly the start of an escaped quote */
+ escape = TRUE;
+ *content++ = '\\'; /* even though this is an escape character, we still
+ store it as-is in the target buffer */
+ continue;
+ }
+ break;
+ case ',':
+ if(!starts_with_quote) {
+ /* this signals the end of the content if we didn't get a starting
+ quote and then we do "sloppy" parsing */
+ c = 0; /* the end */
+ continue;
+ }
+ break;
+ case '\r':
+ case '\n':
+ /* end of string */
+ c = 0;
+ continue;
+ case '\"':
+ if(!escape && starts_with_quote) {
+ /* end of string */
+ c = 0;
+ continue;
+ }
+ break;
+ }
+ escape = FALSE;
+ *content++ = *str;
+ }
+ *content = 0;
+
+ *endptr = str;
+
+ return 0; /* all is fine! */
+}
+
+/* Convert md5 chunk to RFC2617 (section 3.1.3) -suitable ascii string*/
+static void sasl_digest_md5_to_ascii(unsigned char *source, /* 16 bytes */
+ unsigned char *dest) /* 33 bytes */
+{
+ int i;
+ for(i = 0; i < 16; i++)
+ snprintf((char *)&dest[i*2], 3, "%02x", source[i]);
+}
+
+/* Perform quoted-string escaping as described in RFC2616 and its errata */
+static char *sasl_digest_string_quoted(const char *source)
+{
+ char *dest, *d;
+ const char *s = source;
+ size_t n = 1; /* null terminator */
+
+ /* Calculate size needed */
+ while(*s) {
+ ++n;
+ if(*s == '"' || *s == '\\') {
+ ++n;
+ }
+ ++s;
+ }
+
+ dest = malloc(n);
+ if(dest) {
+ s = source;
+ d = dest;
+ while(*s) {
+ if(*s == '"' || *s == '\\') {
+ *d++ = '\\';
+ }
+ *d++ = *s++;
+ }
+ *d = 0;
+ }
+
+ return dest;
+}
+
+/* Retrieves the value for a corresponding key from the challenge string
+ * returns TRUE if the key could be found, FALSE if it does not exists
+ */
+static bool sasl_digest_get_key_value(const char *chlg,
+ const char *key,
+ char *value,
+ size_t max_val_len,
+ char end_char)
+{
+ char *find_pos;
+ size_t i;
+
+ find_pos = strstr(chlg, key);
+ if(!find_pos)
+ return FALSE;
+
+ find_pos += strlen(key);
+
+ for(i = 0; *find_pos && *find_pos != end_char && i < max_val_len - 1; ++i)
+ value[i] = *find_pos++;
+ value[i] = '\0';
+
+ return TRUE;
+}
+
+static CURLcode sasl_digest_get_qop_values(const char *options, int *value)
+{
+ char *tmp;
+ char *token;
+ char *tok_buf;
+
+ /* Initialise the output */
+ *value = 0;
+
+ /* Tokenise the list of qop values. Use a temporary clone of the buffer since
+ strtok_r() ruins it. */
+ tmp = strdup(options);
+ if(!tmp)
+ return CURLE_OUT_OF_MEMORY;
+
+ token = strtok_r(tmp, ",", &tok_buf);
+ while(token != NULL) {
+ if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH))
+ *value |= DIGEST_QOP_VALUE_AUTH;
+ else if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH_INT))
+ *value |= DIGEST_QOP_VALUE_AUTH_INT;
+ else if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH_CONF))
+ *value |= DIGEST_QOP_VALUE_AUTH_CONF;
+
+ token = strtok_r(NULL, ",", &tok_buf);
+ }
+
+ free(tmp);
+
+ return CURLE_OK;
+}
+#endif /* !CURL_DISABLE_CRYPTO_AUTH && !USE_WINDOWS_SSPI */
+
+#if !defined(USE_WINDOWS_SSPI)
+/*
+ * Curl_sasl_build_spn()
+ *
+ * This is used to build a SPN string in the format service/host.
+ *
+ * Parameters:
+ *
+ * service [in] - The service type such as www, smtp, pop or imap.
+ * host [in] - The host name or realm.
+ *
+ * Returns a pointer to the newly allocated SPN.
+ */
+CURL_STATIC char *Curl_sasl_build_spn(const char *service, const char *host)
+{
+ /* Generate and return our SPN */
+ return aprintf("%s/%s", service, host);
+}
+#endif
+
+/*
+ * sasl_create_plain_message()
+ *
+ * This is used to generate an already encoded PLAIN message ready
+ * for sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * userp [in] - The user name.
+ * passdwp [in] - The user's password.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+static CURLcode sasl_create_plain_message(struct SessionHandle *data,
+ const char *userp,
+ const char *passwdp,
+ char **outptr, size_t *outlen)
+{
+ CURLcode result;
+ char *plainauth;
+ size_t ulen;
+ size_t plen;
+
+ ulen = strlen(userp);
+ plen = strlen(passwdp);
+
+ plainauth = malloc(2 * ulen + plen + 2);
+ if(!plainauth) {
+ *outlen = 0;
+ *outptr = NULL;
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ /* Calculate the reply */
+ memcpy(plainauth, userp, ulen);
+ plainauth[ulen] = '\0';
+ memcpy(plainauth + ulen + 1, userp, ulen);
+ plainauth[2 * ulen + 1] = '\0';
+ memcpy(plainauth + 2 * ulen + 2, passwdp, plen);
+
+ /* Base64 encode the reply */
+ result = Curl_base64_encode(data, plainauth, 2 * ulen + plen + 2, outptr,
+ outlen);
+ free(plainauth);
+ return result;
+}
+
+/*
+ * sasl_create_login_message()
+ *
+ * This is used to generate an already encoded LOGIN message containing the
+ * user name or password ready for sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * valuep [in] - The user name or user's password.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+static CURLcode sasl_create_login_message(struct SessionHandle *data,
+ const char *valuep, char **outptr,
+ size_t *outlen)
+{
+ size_t vlen = strlen(valuep);
+
+ if(!vlen) {
+ /* Calculate an empty reply */
+ *outptr = strdup("=");
+ if(*outptr) {
+ *outlen = (size_t) 1;
+ return CURLE_OK;
+ }
+
+ *outlen = 0;
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ /* Base64 encode the value */
+ return Curl_base64_encode(data, valuep, vlen, outptr, outlen);
+}
+
+/*
+ * sasl_create_external_message()
+ *
+ * This is used to generate an already encoded EXTERNAL message containing
+ * the user name ready for sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * user [in] - The user name.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+static CURLcode sasl_create_external_message(struct SessionHandle *data,
+ const char *user, char **outptr,
+ size_t *outlen)
+{
+ /* This is the same formatting as the login message. */
+ return sasl_create_login_message(data, user, outptr, outlen);
+}
+
+#ifndef CURL_DISABLE_CRYPTO_AUTH
+ /*
+ * sasl_decode_cram_md5_message()
+ *
+ * This is used to decode an already encoded CRAM-MD5 challenge message.
+ *
+ * Parameters:
+ *
+ * chlg64 [in] - The base64 encoded challenge message.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+static CURLcode sasl_decode_cram_md5_message(const char *chlg64, char **outptr,
+ size_t *outlen)
+{
+ CURLcode result = CURLE_OK;
+ size_t chlg64len = strlen(chlg64);
+
+ *outptr = NULL;
+ *outlen = 0;
+
+ /* Decode the challenge if necessary */
+ if(chlg64len && *chlg64 != '=')
+ result = Curl_base64_decode(chlg64, (unsigned char **) outptr, outlen);
+
+ return result;
+ }
+
+ /*
+ * sasl_create_cram_md5_message()
+ *
+ * This is used to generate an already encoded CRAM-MD5 response message ready
+ * for sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * chlg [in] - The challenge.
+ * userp [in] - The user name.
+ * passdwp [in] - The user's password.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+static CURLcode sasl_create_cram_md5_message(struct SessionHandle *data,
+ const char *chlg,
+ const char *userp,
+ const char *passwdp,
+ char **outptr, size_t *outlen)
+{
+ CURLcode result = CURLE_OK;
+ size_t chlglen = 0;
+ HMAC_context *ctxt;
+ unsigned char digest[MD5_DIGEST_LEN];
+ char *response;
+
+ if(chlg)
+ chlglen = strlen(chlg);
+
+ /* Compute the digest using the password as the key */
+ ctxt = Curl_HMAC_init(Curl_HMAC_MD5,
+ (const unsigned char *) passwdp,
+ curlx_uztoui(strlen(passwdp)));
+ if(!ctxt)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* Update the digest with the given challenge */
+ if(chlglen > 0)
+ Curl_HMAC_update(ctxt, (const unsigned char *) chlg,
+ curlx_uztoui(chlglen));
+
+ /* Finalise the digest */
+ Curl_HMAC_final(ctxt, digest);
+
+ /* Generate the response */
+ response = aprintf(
+ "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
+ userp, digest[0], digest[1], digest[2], digest[3], digest[4],
+ digest[5], digest[6], digest[7], digest[8], digest[9], digest[10],
+ digest[11], digest[12], digest[13], digest[14], digest[15]);
+ if(!response)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* Base64 encode the response */
+ result = Curl_base64_encode(data, response, 0, outptr, outlen);
+
+ free(response);
+
+ return result;
+}
+
+#ifndef USE_WINDOWS_SSPI
+/*
+ * sasl_decode_digest_md5_message()
+ *
+ * This is used internally to decode an already encoded DIGEST-MD5 challenge
+ * message into the seperate attributes.
+ *
+ * Parameters:
+ *
+ * chlg64 [in] - The base64 encoded challenge message.
+ * nonce [in/out] - The buffer where the nonce will be stored.
+ * nlen [in] - The length of the nonce buffer.
+ * realm [in/out] - The buffer where the realm will be stored.
+ * rlen [in] - The length of the realm buffer.
+ * alg [in/out] - The buffer where the algorithm will be stored.
+ * alen [in] - The length of the algorithm buffer.
+ * qop [in/out] - The buffer where the qop-options will be stored.
+ * qlen [in] - The length of the qop buffer.
+ *
+ * Returns CURLE_OK on success.
+ */
+static CURLcode sasl_decode_digest_md5_message(const char *chlg64,
+ char *nonce, size_t nlen,
+ char *realm, size_t rlen,
+ char *alg, size_t alen,
+ char *qop, size_t qlen)
+{
+ CURLcode result = CURLE_OK;
+ unsigned char *chlg = NULL;
+ size_t chlglen = 0;
+ size_t chlg64len = strlen(chlg64);
+
+ /* Decode the base-64 encoded challenge message */
+ if(chlg64len && *chlg64 != '=') {
+ result = Curl_base64_decode(chlg64, &chlg, &chlglen);
+ if(result)
+ return result;
+ }
+
+ /* Ensure we have a valid challenge message */
+ if(!chlg)
+ return CURLE_BAD_CONTENT_ENCODING;
+
+ /* Retrieve nonce string from the challenge */
+ if(!sasl_digest_get_key_value((char *)chlg, "nonce=\"", nonce, nlen, '\"')) {
+ free(chlg);
+ return CURLE_BAD_CONTENT_ENCODING;
+ }
+
+ /* Retrieve realm string from the challenge */
+ if(!sasl_digest_get_key_value((char *)chlg, "realm=\"", realm, rlen, '\"')) {
+ /* Challenge does not have a realm, set empty string [RFC2831] page 6 */
+ strcpy(realm, "");
+ }
+
+ /* Retrieve algorithm string from the challenge */
+ if(!sasl_digest_get_key_value((char *)chlg, "algorithm=", alg, alen, ',')) {
+ free(chlg);
+ return CURLE_BAD_CONTENT_ENCODING;
+ }
+
+ /* Retrieve qop-options string from the challenge */
+ if(!sasl_digest_get_key_value((char *)chlg, "qop=\"", qop, qlen, '\"')) {
+ free(chlg);
+ return CURLE_BAD_CONTENT_ENCODING;
+ }
+
+ free(chlg);
+
+ return CURLE_OK;
+}
+
+/*
+ * Curl_sasl_create_digest_md5_message()
+ *
+ * This is used to generate an already encoded DIGEST-MD5 response message
+ * ready for sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * chlg64 [in] - The base64 encoded challenge message.
+ * userp [in] - The user name.
+ * passdwp [in] - The user's password.
+ * service [in] - The service type such as www, smtp, pop or imap.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURL_STATIC CURLcode Curl_sasl_create_digest_md5_message(struct SessionHandle *data,
+ const char *chlg64,
+ const char *userp,
+ const char *passwdp,
+ const char *service,
+ char **outptr, size_t *outlen)
+{
+ CURLcode result = CURLE_OK;
+ size_t i;
+ MD5_context *ctxt;
+ char *response = NULL;
+ unsigned char digest[MD5_DIGEST_LEN];
+ char HA1_hex[2 * MD5_DIGEST_LEN + 1];
+ char HA2_hex[2 * MD5_DIGEST_LEN + 1];
+ char resp_hash_hex[2 * MD5_DIGEST_LEN + 1];
+ char nonce[64];
+ char realm[128];
+ char algorithm[64];
+ char qop_options[64];
+ int qop_values;
+ char cnonce[33];
+ unsigned int entropy[4];
+ char nonceCount[] = "00000001";
+ char method[] = "AUTHENTICATE";
+ char qop[] = DIGEST_QOP_VALUE_STRING_AUTH;
+ char *spn = NULL;
+
+ /* Decode the challange message */
+ result = sasl_decode_digest_md5_message(chlg64, nonce, sizeof(nonce),
+ realm, sizeof(realm),
+ algorithm, sizeof(algorithm),
+ qop_options, sizeof(qop_options));
+ if(result)
+ return result;
+
+ /* We only support md5 sessions */
+ if(strcmp(algorithm, "md5-sess") != 0)
+ return CURLE_BAD_CONTENT_ENCODING;
+
+ /* Get the qop-values from the qop-options */
+ result = sasl_digest_get_qop_values(qop_options, &qop_values);
+ if(result)
+ return result;
+
+ /* We only support auth quality-of-protection */
+ if(!(qop_values & DIGEST_QOP_VALUE_AUTH))
+ return CURLE_BAD_CONTENT_ENCODING;
+
+ /* Generate 16 bytes of random data */
+ entropy[0] = Curl_rand(data);
+ entropy[1] = Curl_rand(data);
+ entropy[2] = Curl_rand(data);
+ entropy[3] = Curl_rand(data);
+
+ /* Convert the random data into a 32 byte hex string */
+ snprintf(cnonce, sizeof(cnonce), "%08x%08x%08x%08x",
+ entropy[0], entropy[1], entropy[2], entropy[3]);
+
+ /* So far so good, now calculate A1 and H(A1) according to RFC 2831 */
+ ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
+ if(!ctxt)
+ return CURLE_OUT_OF_MEMORY;
+
+ Curl_MD5_update(ctxt, (const unsigned char *) userp,
+ curlx_uztoui(strlen(userp)));
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+ Curl_MD5_update(ctxt, (const unsigned char *) realm,
+ curlx_uztoui(strlen(realm)));
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+ Curl_MD5_update(ctxt, (const unsigned char *) passwdp,
+ curlx_uztoui(strlen(passwdp)));
+ Curl_MD5_final(ctxt, digest);
+
+ ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
+ if(!ctxt)
+ return CURLE_OUT_OF_MEMORY;
+
+ Curl_MD5_update(ctxt, (const unsigned char *) digest, MD5_DIGEST_LEN);
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+ Curl_MD5_update(ctxt, (const unsigned char *) nonce,
+ curlx_uztoui(strlen(nonce)));
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+ Curl_MD5_update(ctxt, (const unsigned char *) cnonce,
+ curlx_uztoui(strlen(cnonce)));
+ Curl_MD5_final(ctxt, digest);
+
+ /* Convert calculated 16 octet hex into 32 bytes string */
+ for(i = 0; i < MD5_DIGEST_LEN; i++)
+ snprintf(&HA1_hex[2 * i], 3, "%02x", digest[i]);
+
+ /* Generate our SPN */
+ spn = Curl_sasl_build_spn(service, realm);
+ if(!spn)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* Calculate H(A2) */
+ ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
+ if(!ctxt) {
+ free(spn);
+
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ Curl_MD5_update(ctxt, (const unsigned char *) method,
+ curlx_uztoui(strlen(method)));
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+ Curl_MD5_update(ctxt, (const unsigned char *) spn,
+ curlx_uztoui(strlen(spn)));
+ Curl_MD5_final(ctxt, digest);
+
+ for(i = 0; i < MD5_DIGEST_LEN; i++)
+ snprintf(&HA2_hex[2 * i], 3, "%02x", digest[i]);
+
+ /* Now calculate the response hash */
+ ctxt = Curl_MD5_init(Curl_DIGEST_MD5);
+ if(!ctxt) {
+ free(spn);
+
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ Curl_MD5_update(ctxt, (const unsigned char *) HA1_hex, 2 * MD5_DIGEST_LEN);
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+ Curl_MD5_update(ctxt, (const unsigned char *) nonce,
+ curlx_uztoui(strlen(nonce)));
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+
+ Curl_MD5_update(ctxt, (const unsigned char *) nonceCount,
+ curlx_uztoui(strlen(nonceCount)));
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+ Curl_MD5_update(ctxt, (const unsigned char *) cnonce,
+ curlx_uztoui(strlen(cnonce)));
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+ Curl_MD5_update(ctxt, (const unsigned char *) qop,
+ curlx_uztoui(strlen(qop)));
+ Curl_MD5_update(ctxt, (const unsigned char *) ":", 1);
+
+ Curl_MD5_update(ctxt, (const unsigned char *) HA2_hex, 2 * MD5_DIGEST_LEN);
+ Curl_MD5_final(ctxt, digest);
+
+ for(i = 0; i < MD5_DIGEST_LEN; i++)
+ snprintf(&resp_hash_hex[2 * i], 3, "%02x", digest[i]);
+
+ /* Generate the response */
+ response = aprintf("username=\"%s\",realm=\"%s\",nonce=\"%s\","
+ "cnonce=\"%s\",nc=\"%s\",digest-uri=\"%s\",response=%s,"
+ "qop=%s",
+ userp, realm, nonce,
+ cnonce, nonceCount, spn, resp_hash_hex, qop);
+ free(spn);
+ if(!response)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* Base64 encode the response */
+ result = Curl_base64_encode(data, response, 0, outptr, outlen);
+
+ free(response);
+
+ return result;
+}
+
+/*
+ * Curl_sasl_decode_digest_http_message()
+ *
+ * This is used to decode a HTTP DIGEST challenge message into the seperate
+ * attributes.
+ *
+ * Parameters:
+ *
+ * chlg [in] - The challenge message.
+ * digest [in/out] - The digest data struct being used and modified.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURL_STATIC CURLcode Curl_sasl_decode_digest_http_message(const char *chlg,
+ struct digestdata *digest)
+{
+ bool before = FALSE; /* got a nonce before */
+ bool foundAuth = FALSE;
+ bool foundAuthInt = FALSE;
+ char *token = NULL;
+ char *tmp = NULL;
+
+ /* If we already have received a nonce, keep that in mind */
+ if(digest->nonce)
+ before = TRUE;
+
+ /* Clean up any former leftovers and initialise to defaults */
+ Curl_sasl_digest_cleanup(digest);
+
+ for(;;) {
+ char value[DIGEST_MAX_VALUE_LENGTH];
+ char content[DIGEST_MAX_CONTENT_LENGTH];
+
+ /* Pass all additional spaces here */
+ while(*chlg && ISSPACE(*chlg))
+ chlg++;
+
+ /* Extract a value=content pair */
+ if(!sasl_digest_get_pair(chlg, value, content, &chlg)) {
+ if(Curl_raw_equal(value, "nonce")) {
+ digest->nonce = strdup(content);
+ if(!digest->nonce)
+ return CURLE_OUT_OF_MEMORY;
+ }
+ else if(Curl_raw_equal(value, "stale")) {
+ if(Curl_raw_equal(content, "true")) {
+ digest->stale = TRUE;
+ digest->nc = 1; /* we make a new nonce now */
+ }
+ }
+ else if(Curl_raw_equal(value, "realm")) {
+ digest->realm = strdup(content);
+ if(!digest->realm)
+ return CURLE_OUT_OF_MEMORY;
+ }
+ else if(Curl_raw_equal(value, "opaque")) {
+ digest->opaque = strdup(content);
+ if(!digest->opaque)
+ return CURLE_OUT_OF_MEMORY;
+ }
+ else if(Curl_raw_equal(value, "qop")) {
+ char *tok_buf;
+ /* Tokenize the list and choose auth if possible, use a temporary
+ clone of the buffer since strtok_r() ruins it */
+ tmp = strdup(content);
+ if(!tmp)
+ return CURLE_OUT_OF_MEMORY;
+
+ token = strtok_r(tmp, ",", &tok_buf);
+ while(token != NULL) {
+ if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH)) {
+ foundAuth = TRUE;
+ }
+ else if(Curl_raw_equal(token, DIGEST_QOP_VALUE_STRING_AUTH_INT)) {
+ foundAuthInt = TRUE;
+ }
+ token = strtok_r(NULL, ",", &tok_buf);
+ }
+
+ free(tmp);
+
+ /* Select only auth or auth-int. Otherwise, ignore */
+ if(foundAuth) {
+ digest->qop = strdup(DIGEST_QOP_VALUE_STRING_AUTH);
+ if(!digest->qop)
+ return CURLE_OUT_OF_MEMORY;
+ }
+ else if(foundAuthInt) {
+ digest->qop = strdup(DIGEST_QOP_VALUE_STRING_AUTH_INT);
+ if(!digest->qop)
+ return CURLE_OUT_OF_MEMORY;
+ }
+ }
+ else if(Curl_raw_equal(value, "algorithm")) {
+ digest->algorithm = strdup(content);
+ if(!digest->algorithm)
+ return CURLE_OUT_OF_MEMORY;
+
+ if(Curl_raw_equal(content, "MD5-sess"))
+ digest->algo = CURLDIGESTALGO_MD5SESS;
+ else if(Curl_raw_equal(content, "MD5"))
+ digest->algo = CURLDIGESTALGO_MD5;
+ else
+ return CURLE_BAD_CONTENT_ENCODING;
+ }
+ else {
+ /* unknown specifier, ignore it! */
+ }
+ }
+ else
+ break; /* we're done here */
+
+ /* Pass all additional spaces here */
+ while(*chlg && ISSPACE(*chlg))
+ chlg++;
+
+ /* Allow the list to be comma-separated */
+ if(',' == *chlg)
+ chlg++;
+ }
+
+ /* We had a nonce since before, and we got another one now without
+ 'stale=true'. This means we provided bad credentials in the previous
+ request */
+ if(before && !digest->stale)
+ return CURLE_BAD_CONTENT_ENCODING;
+
+ /* We got this header without a nonce, that's a bad Digest line! */
+ if(!digest->nonce)
+ return CURLE_BAD_CONTENT_ENCODING;
+
+ return CURLE_OK;
+}
+
+/*
+ * Curl_sasl_create_digest_http_message()
+ *
+ * This is used to generate a HTTP DIGEST response message ready for sending
+ * to the recipient.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * userp [in] - The user name.
+ * passdwp [in] - The user's password.
+ * request [in] - The HTTP request.
+ * uripath [in] - The path of the HTTP uri.
+ * digest [in/out] - The digest data struct being used and modified.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURL_STATIC CURLcode Curl_sasl_create_digest_http_message(struct SessionHandle *data,
+ const char *userp,
+ const char *passwdp,
+ const unsigned char *request,
+ const unsigned char *uripath,
+ struct digestdata *digest,
+ char **outptr, size_t *outlen)
+{
+ CURLcode result;
+ unsigned char md5buf[16]; /* 16 bytes/128 bits */
+ unsigned char request_digest[33];
+ unsigned char *md5this;
+ unsigned char ha1[33];/* 32 digits and 1 zero byte */
+ unsigned char ha2[33];/* 32 digits and 1 zero byte */
+ char cnoncebuf[33];
+ char *cnonce = NULL;
+ size_t cnonce_sz = 0;
+ char *userp_quoted;
+ char *response = NULL;
+ char *tmp = NULL;
+
+ if(!digest->nc)
+ digest->nc = 1;
+
+ if(!digest->cnonce) {
+ snprintf(cnoncebuf, sizeof(cnoncebuf), "%08x%08x%08x%08x",
+ Curl_rand(data), Curl_rand(data),
+ Curl_rand(data), Curl_rand(data));
+
+ result = Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf),
+ &cnonce, &cnonce_sz);
+ if(result)
+ return result;
+
+ digest->cnonce = cnonce;
+ }
+
+ /*
+ if the algorithm is "MD5" or unspecified (which then defaults to MD5):
+
+ A1 = unq(username-value) ":" unq(realm-value) ":" passwd
+
+ if the algorithm is "MD5-sess" then:
+
+ A1 = H( unq(username-value) ":" unq(realm-value) ":" passwd )
+ ":" unq(nonce-value) ":" unq(cnonce-value)
+ */
+
+ md5this = (unsigned char *)
+ aprintf("%s:%s:%s", userp, digest->realm, passwdp);
+ if(!md5this)
+ return CURLE_OUT_OF_MEMORY;
+
+ CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
+ Curl_md5it(md5buf, md5this);
+ free(md5this);
+ sasl_digest_md5_to_ascii(md5buf, ha1);
+
+ if(digest->algo == CURLDIGESTALGO_MD5SESS) {
+ /* nonce and cnonce are OUTSIDE the hash */
+ tmp = aprintf("%s:%s:%s", ha1, digest->nonce, digest->cnonce);
+ if(!tmp)
+ return CURLE_OUT_OF_MEMORY;
+
+ CURL_OUTPUT_DIGEST_CONV(data, tmp); /* convert on non-ASCII machines */
+ Curl_md5it(md5buf, (unsigned char *)tmp);
+ free(tmp);
+ sasl_digest_md5_to_ascii(md5buf, ha1);
+ }
+
+ /*
+ If the "qop" directive's value is "auth" or is unspecified, then A2 is:
+
+ A2 = Method ":" digest-uri-value
+
+ If the "qop" value is "auth-int", then A2 is:
+
+ A2 = Method ":" digest-uri-value ":" H(entity-body)
+
+ (The "Method" value is the HTTP request method as specified in section
+ 5.1.1 of RFC 2616)
+ */
+
+ md5this = (unsigned char *)aprintf("%s:%s", request, uripath);
+
+ if(digest->qop && Curl_raw_equal(digest->qop, "auth-int")) {
+ /* We don't support auth-int for PUT or POST at the moment.
+ TODO: replace md5 of empty string with entity-body for PUT/POST */
+ unsigned char *md5this2 = (unsigned char *)
+ aprintf("%s:%s", md5this, "d41d8cd98f00b204e9800998ecf8427e");
+ free(md5this);
+ md5this = md5this2;
+ }
+
+ if(!md5this)
+ return CURLE_OUT_OF_MEMORY;
+
+ CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
+ Curl_md5it(md5buf, md5this);
+ free(md5this);
+ sasl_digest_md5_to_ascii(md5buf, ha2);
+
+ if(digest->qop) {
+ md5this = (unsigned char *)aprintf("%s:%s:%08x:%s:%s:%s",
+ ha1,
+ digest->nonce,
+ digest->nc,
+ digest->cnonce,
+ digest->qop,
+ ha2);
+ }
+ else {
+ md5this = (unsigned char *)aprintf("%s:%s:%s",
+ ha1,
+ digest->nonce,
+ ha2);
+ }
+
+ if(!md5this)
+ return CURLE_OUT_OF_MEMORY;
+
+ CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
+ Curl_md5it(md5buf, md5this);
+ free(md5this);
+ sasl_digest_md5_to_ascii(md5buf, request_digest);
+
+ /* for test case 64 (snooped from a Mozilla 1.3a request)
+
+ Authorization: Digest username="testuser", realm="testrealm", \
+ nonce="1053604145", uri="/64", response="c55f7f30d83d774a3d2dcacf725abaca"
+
+ Digest parameters are all quoted strings. Username which is provided by
+ the user will need double quotes and backslashes within it escaped. For
+ the other fields, this shouldn't be an issue. realm, nonce, and opaque
+ are copied as is from the server, escapes and all. cnonce is generated
+ with web-safe characters. uri is already percent encoded. nc is 8 hex
+ characters. algorithm and qop with standard values only contain web-safe
+ chracters.
+ */
+ userp_quoted = sasl_digest_string_quoted(userp);
+ if(!userp_quoted)
+ return CURLE_OUT_OF_MEMORY;
+
+ if(digest->qop) {
+ response = aprintf("username=\"%s\", "
+ "realm=\"%s\", "
+ "nonce=\"%s\", "
+ "uri=\"%s\", "
+ "cnonce=\"%s\", "
+ "nc=%08x, "
+ "qop=%s, "
+ "response=\"%s\"",
+ userp_quoted,
+ digest->realm,
+ digest->nonce,
+ uripath,
+ digest->cnonce,
+ digest->nc,
+ digest->qop,
+ request_digest);
+
+ if(Curl_raw_equal(digest->qop, "auth"))
+ digest->nc++; /* The nc (from RFC) has to be a 8 hex digit number 0
+ padded which tells to the server how many times you are
+ using the same nonce in the qop=auth mode */
+ }
+ else {
+ response = aprintf("username=\"%s\", "
+ "realm=\"%s\", "
+ "nonce=\"%s\", "
+ "uri=\"%s\", "
+ "response=\"%s\"",
+ userp_quoted,
+ digest->realm,
+ digest->nonce,
+ uripath,
+ request_digest);
+ }
+ free(userp_quoted);
+ if(!response)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* Add the optional fields */
+ if(digest->opaque) {
+ /* Append the opaque */
+ tmp = aprintf("%s, opaque=\"%s\"", response, digest->opaque);
+ free(response);
+ if(!tmp)
+ return CURLE_OUT_OF_MEMORY;
+
+ response = tmp;
+ }
+
+ if(digest->algorithm) {
+ /* Append the algorithm */
+ tmp = aprintf("%s, algorithm=\"%s\"", response, digest->algorithm);
+ free(response);
+ if(!tmp)
+ return CURLE_OUT_OF_MEMORY;
+
+ response = tmp;
+ }
+
+ /* Return the output */
+ *outptr = response;
+ *outlen = strlen(response);
+
+ return CURLE_OK;
+}
+
+/*
+ * Curl_sasl_digest_cleanup()
+ *
+ * This is used to clean up the digest specific data.
+ *
+ * Parameters:
+ *
+ * digest [in/out] - The digest data struct being cleaned up.
+ *
+ */
+CURL_STATIC void Curl_sasl_digest_cleanup(struct digestdata *digest)
+{
+ Curl_safefree(digest->nonce);
+ Curl_safefree(digest->cnonce);
+ Curl_safefree(digest->realm);
+ Curl_safefree(digest->opaque);
+ Curl_safefree(digest->qop);
+ Curl_safefree(digest->algorithm);
+
+ digest->nc = 0;
+ digest->algo = CURLDIGESTALGO_MD5; /* default algorithm */
+ digest->stale = FALSE; /* default means normal, not stale */
+}
+#endif /* !USE_WINDOWS_SSPI */
+
+#endif /* CURL_DISABLE_CRYPTO_AUTH */
+
+#if defined(USE_NTLM) && !defined(USE_WINDOWS_SSPI)
+/*
+ * Curl_sasl_ntlm_cleanup()
+ *
+ * This is used to clean up the ntlm specific data.
+ *
+ * Parameters:
+ *
+ * ntlm [in/out] - The ntlm data struct being cleaned up.
+ *
+ */
+CURL_STATIC void Curl_sasl_ntlm_cleanup(struct ntlmdata *ntlm)
+{
+ /* Free the target info */
+ Curl_safefree(ntlm->target_info);
+
+ /* Reset any variables */
+ ntlm->target_info_len = 0;
+ }
+#endif /* USE_NTLM && !USE_WINDOWS_SSPI*/
+
+/*
+ * sasl_create_xoauth2_message()
+ *
+ * This is used to generate an already encoded OAuth 2.0 message ready for
+ * sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * user [in] - The user name.
+ * bearer [in] - The bearer token.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+static CURLcode sasl_create_xoauth2_message(struct SessionHandle *data,
+ const char *user,
+ const char *bearer,
+ char **outptr, size_t *outlen)
+{
+ CURLcode result = CURLE_OK;
+ char *xoauth = NULL;
+
+ /* Generate the message */
+ xoauth = aprintf("user=%s\1auth=Bearer %s\1\1", user, bearer);
+ if(!xoauth)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* Base64 encode the reply */
+ result = Curl_base64_encode(data, xoauth, strlen(xoauth), outptr, outlen);
+
+ free(xoauth);
+
+ return result;
+}
+
+/*
+ * Curl_sasl_cleanup()
+ *
+ * This is used to cleanup any libraries or curl modules used by the sasl
+ * functions.
+ *
+ * Parameters:
+ *
+ * conn [in] - The connection data.
+ * authused [in] - The authentication mechanism used.
+ */
+CURL_STATIC void Curl_sasl_cleanup(struct connectdata *conn, unsigned int authused)
+{
+#if defined(USE_KERBEROS5)
+ /* Cleanup the gssapi structure */
+ if(authused == SASL_MECH_GSSAPI) {
+ Curl_sasl_gssapi_cleanup(&conn->krb5);
+ }
+#endif
+
+#if defined(USE_NTLM)
+ /* Cleanup the ntlm structure */
+ if(authused == SASL_MECH_NTLM) {
+ Curl_ntlm_sspi_cleanup(&conn->ntlm);
+ }
+#endif
+
+#if !defined(USE_KERBEROS5) && !defined(USE_NTLM)
+ /* Reserved for future use */
+ (void)conn;
+ (void)authused;
+#endif
+}
+
+/*
+ * Curl_sasl_decode_mech()
+ *
+ * Convert a SASL mechanism name into a token.
+ *
+ * Parameters:
+ *
+ * ptr [in] - The mechanism string.
+ * maxlen [in] - Maximum mechanism string length.
+ * len [out] - If not NULL, effective name length.
+ *
+ * Returns the SASL mechanism token or 0 if no match.
+ */
+CURL_STATIC unsigned int Curl_sasl_decode_mech(const char *ptr, size_t maxlen, size_t *len)
+{
+ unsigned int i;
+ char c;
+
+ for(i = 0; mechtable[i].name; i++) {
+ if(maxlen >= mechtable[i].len &&
+ !memcmp(ptr, mechtable[i].name, mechtable[i].len)) {
+ if(len)
+ *len = mechtable[i].len;
+
+ if(maxlen == mechtable[i].len)
+ return mechtable[i].bit;
+
+ c = ptr[mechtable[i].len];
+ if(!ISUPPER(c) && !ISDIGIT(c) && c != '-' && c != '_')
+ return mechtable[i].bit;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Curl_sasl_parse_url_auth_option()
+ *
+ * Parse the URL login options.
+ */
+CURL_STATIC CURLcode Curl_sasl_parse_url_auth_option(struct SASL *sasl,
+ const char *value, size_t len)
+{
+ CURLcode result = CURLE_OK;
+ unsigned int mechbit;
+ size_t mechlen;
+
+ if(!len)
+ return CURLE_URL_MALFORMAT;
+
+ if(sasl->resetprefs) {
+ sasl->resetprefs = FALSE;
+ sasl->prefmech = SASL_AUTH_NONE;
+ }
+
+ if(strnequal(value, "*", len))
+ sasl->prefmech = SASL_AUTH_DEFAULT;
+ else if((mechbit = Curl_sasl_decode_mech(value, len, &mechlen)) &&
+ mechlen == len)
+ sasl->prefmech |= mechbit;
+ else
+ result = CURLE_URL_MALFORMAT;
+
+ return result;
+}
+
+/*
+ * Curl_sasl_init()
+ *
+ * Initializes the SASL structure.
+ */
+CURL_STATIC void Curl_sasl_init(struct SASL *sasl, const struct SASLproto *params)
+{
+ sasl->params = params; /* Set protocol dependent parameters */
+ sasl->state = SASL_STOP; /* Not yet running */
+ sasl->authmechs = SASL_AUTH_NONE; /* No known authentication mechanism yet */
+ sasl->prefmech = SASL_AUTH_DEFAULT; /* Prefer all mechanisms */
+ sasl->authused = SASL_AUTH_NONE; /* No the authentication mechanism used */
+ sasl->resetprefs = TRUE; /* Reset prefmech upon AUTH parsing. */
+ sasl->mutual_auth = FALSE; /* No mutual authentication (GSSAPI only) */
+ sasl->force_ir = FALSE; /* Respect external option */
+}
+
+/*
+ * state()
+ *
+ * This is the ONLY way to change SASL state!
+ */
+static void state(struct SASL *sasl, struct connectdata *conn,
+ saslstate newstate)
+{
+#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
+ /* for debug purposes */
+ static const char * const names[]={
+ "STOP",
+ "PLAIN",
+ "LOGIN",
+ "LOGIN_PASSWD",
+ "EXTERNAL",
+ "CRAMMD5",
+ "DIGESTMD5",
+ "DIGESTMD5_RESP",
+ "NTLM",
+ "NTLM_TYPE2MSG",
+ "GSSAPI",
+ "GSSAPI_TOKEN",
+ "GSSAPI_NO_DATA",
+ "XOAUTH2",
+ "CANCEL",
+ "FINAL",
+ /* LAST */
+ };
+
+ if(sasl->state != newstate)
+ infof(conn->data, "SASL %p state change from %s to %s\n",
+ (void *)sasl, names[sasl->state], names[newstate]);
+#else
+ (void) conn;
+#endif
+
+ sasl->state = newstate;
+}
+
+/*
+ * Curl_sasl_can_authenticate()
+ *
+ * Check if we have enough auth data and capabilities to authenticate.
+ */
+CURL_STATIC bool Curl_sasl_can_authenticate(struct SASL *sasl, struct connectdata *conn)
+{
+ /* Have credentials been provided? */
+ if(conn->bits.user_passwd)
+ return TRUE;
+
+ /* EXTERNAL can authenticate without a user name and/or password */
+ if(sasl->authmechs & sasl->prefmech & SASL_MECH_EXTERNAL)
+ return TRUE;
+
+ return FALSE;
+}
+
+/*
+ * Curl_sasl_start()
+ *
+ * Calculate the required login details for SASL authentication.
+ */
+CURL_STATIC CURLcode Curl_sasl_start(struct SASL *sasl, struct connectdata *conn,
+ bool force_ir, saslprogress *progress)
+{
+ CURLcode result = CURLE_OK;
+ struct SessionHandle *data = conn->data;
+ unsigned int enabledmechs;
+ const char *mech = NULL;
+ char *resp = NULL;
+ size_t len = 0;
+ saslstate state1 = SASL_STOP;
+ saslstate state2 = SASL_FINAL;
+
+ sasl->force_ir = force_ir; /* Latch for future use */
+ sasl->authused = 0; /* No mechanism used yet */
+ enabledmechs = sasl->authmechs & sasl->prefmech;
+ *progress = SASL_IDLE;
+
+ /* Calculate the supported authentication mechanism, by decreasing order of
+ security, as well as the initial response where appropriate */
+ if((enabledmechs & SASL_MECH_EXTERNAL) && !conn->passwd[0]) {
+ mech = SASL_MECH_STRING_EXTERNAL;
+ state1 = SASL_EXTERNAL;
+ sasl->authused = SASL_MECH_EXTERNAL;
+
+ if(force_ir || data->set.sasl_ir)
+ result = sasl_create_external_message(data, conn->user, &resp, &len);
+ }
+ else if(conn->bits.user_passwd) {
+#if defined(USE_KERBEROS5)
+ if(enabledmechs & SASL_MECH_GSSAPI) {
+ sasl->mutual_auth = FALSE; /* TODO: Calculate mutual authentication */
+ mech = SASL_MECH_STRING_GSSAPI;
+ state1 = SASL_GSSAPI;
+ state2 = SASL_GSSAPI_TOKEN;
+ sasl->authused = SASL_MECH_GSSAPI;
+
+ if(force_ir || data->set.sasl_ir)
+ result = Curl_sasl_create_gssapi_user_message(data, conn->user,
+ conn->passwd,
+ sasl->params->service,
+ sasl->mutual_auth,
+ NULL, &conn->krb5,
+ &resp, &len);
+ }
+ else
+#endif
+#ifndef CURL_DISABLE_CRYPTO_AUTH
+ if(enabledmechs & SASL_MECH_DIGEST_MD5) {
+ mech = SASL_MECH_STRING_DIGEST_MD5;
+ state1 = SASL_DIGESTMD5;
+ sasl->authused = SASL_MECH_DIGEST_MD5;
+ }
+ else if(enabledmechs & SASL_MECH_CRAM_MD5) {
+ mech = SASL_MECH_STRING_CRAM_MD5;
+ state1 = SASL_CRAMMD5;
+ sasl->authused = SASL_MECH_CRAM_MD5;
+ }
+ else
+#endif
+#ifdef USE_NTLM
+ if(enabledmechs & SASL_MECH_NTLM) {
+ mech = SASL_MECH_STRING_NTLM;
+ state1 = SASL_NTLM;
+ state2 = SASL_NTLM_TYPE2MSG;
+ sasl->authused = SASL_MECH_NTLM;
+
+ if(force_ir || data->set.sasl_ir)
+ result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd,
+ &conn->ntlm, &resp, &len);
+ }
+ else
+#endif
+ if((enabledmechs & SASL_MECH_XOAUTH2) || conn->xoauth2_bearer) {
+ mech = SASL_MECH_STRING_XOAUTH2;
+ state1 = SASL_XOAUTH2;
+ sasl->authused = SASL_MECH_XOAUTH2;
+
+ if(force_ir || data->set.sasl_ir)
+ result = sasl_create_xoauth2_message(data, conn->user,
+ conn->xoauth2_bearer,
+ &resp, &len);
+ }
+ else if(enabledmechs & SASL_MECH_LOGIN) {
+ mech = SASL_MECH_STRING_LOGIN;
+ state1 = SASL_LOGIN;
+ state2 = SASL_LOGIN_PASSWD;
+ sasl->authused = SASL_MECH_LOGIN;
+
+ if(force_ir || data->set.sasl_ir)
+ result = sasl_create_login_message(data, conn->user, &resp, &len);
+ }
+ else if(enabledmechs & SASL_MECH_PLAIN) {
+ mech = SASL_MECH_STRING_PLAIN;
+ state1 = SASL_PLAIN;
+ sasl->authused = SASL_MECH_PLAIN;
+
+ if(force_ir || data->set.sasl_ir)
+ result = sasl_create_plain_message(data, conn->user, conn->passwd,
+ &resp, &len);
+ }
+ }
+
+ if(!result) {
+ if(resp && sasl->params->maxirlen &&
+ strlen(mech) + len > sasl->params->maxirlen) {
+ free(resp);
+ resp = NULL;
+ }
+
+ if(mech) {
+ result = sasl->params->sendauth(conn, mech, resp);
+ if(!result) {
+ *progress = SASL_INPROGRESS;
+ state(sasl, conn, resp? state2: state1);
+ }
+ }
+ }
+
+ free(resp);
+
+ return result;
+}
+
+/*
+ * Curl_sasl_continue()
+ *
+ * Continue the authentication.
+ */
+CURL_STATIC CURLcode Curl_sasl_continue(struct SASL *sasl, struct connectdata *conn,
+ int code, saslprogress *progress)
+{
+ CURLcode result = CURLE_OK;
+ struct SessionHandle *data = conn->data;
+ saslstate newstate = SASL_FINAL;
+ char *resp = NULL;
+#if !defined(CURL_DISABLE_CRYPTO_AUTH)
+ char *serverdata;
+ char *chlg = NULL;
+ size_t chlglen = 0;
+#endif
+ size_t len = 0;
+
+ *progress = SASL_INPROGRESS;
+
+ if(sasl->state == SASL_FINAL) {
+ if(code != sasl->params->finalcode)
+ result = CURLE_LOGIN_DENIED;
+ *progress = SASL_DONE;
+ state(sasl, conn, SASL_STOP);
+ return result;
+ }
+
+ if(sasl->state != SASL_CANCEL && code != sasl->params->contcode) {
+ *progress = SASL_DONE;
+ state(sasl, conn, SASL_STOP);
+ return CURLE_LOGIN_DENIED;
+ }
+
+ switch(sasl->state) {
+ case SASL_STOP:
+ *progress = SASL_DONE;
+ return result;
+ case SASL_PLAIN:
+ result = sasl_create_plain_message(data, conn->user, conn->passwd, &resp,
+ &len);
+ break;
+ case SASL_LOGIN:
+ result = sasl_create_login_message(data, conn->user, &resp, &len);
+ newstate = SASL_LOGIN_PASSWD;
+ break;
+ case SASL_LOGIN_PASSWD:
+ result = sasl_create_login_message(data, conn->passwd, &resp, &len);
+ break;
+ case SASL_EXTERNAL:
+ result = sasl_create_external_message(data, conn->user, &resp, &len);
+ break;
+
+#ifndef CURL_DISABLE_CRYPTO_AUTH
+ case SASL_CRAMMD5:
+ sasl->params->getmessage(data->state.buffer, &serverdata);
+ result = sasl_decode_cram_md5_message(serverdata, &chlg, &chlglen);
+ if(!result)
+ result = sasl_create_cram_md5_message(data, chlg, conn->user,
+ conn->passwd, &resp, &len);
+ free(chlg);
+ break;
+ case SASL_DIGESTMD5:
+ sasl->params->getmessage(data->state.buffer, &serverdata);
+ result = Curl_sasl_create_digest_md5_message(data, serverdata,
+ conn->user, conn->passwd,
+ sasl->params->service,
+ &resp, &len);
+ newstate = SASL_DIGESTMD5_RESP;
+ break;
+ case SASL_DIGESTMD5_RESP:
+ if(!(resp = strdup("")))
+ result = CURLE_OUT_OF_MEMORY;
+ break;
+#endif
+
+#ifdef USE_NTLM
+ case SASL_NTLM:
+ /* Create the type-1 message */
+ result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd,
+ &conn->ntlm, &resp, &len);
+ newstate = SASL_NTLM_TYPE2MSG;
+ break;
+ case SASL_NTLM_TYPE2MSG:
+ /* Decode the type-2 message */
+ sasl->params->getmessage(data->state.buffer, &serverdata);
+ result = Curl_sasl_decode_ntlm_type2_message(data, serverdata,
+ &conn->ntlm);
+ if(!result)
+ result = Curl_sasl_create_ntlm_type3_message(data, conn->user,
+ conn->passwd, &conn->ntlm,
+ &resp, &len);
+ break;
+#endif
+
+#if defined(USE_KERBEROS5)
+ case SASL_GSSAPI:
+ result = Curl_sasl_create_gssapi_user_message(data, conn->user,
+ conn->passwd,
+ sasl->params->service,
+ sasl->mutual_auth, NULL,
+ &conn->krb5,
+ &resp, &len);
+ newstate = SASL_GSSAPI_TOKEN;
+ break;
+ case SASL_GSSAPI_TOKEN:
+ sasl->params->getmessage(data->state.buffer, &serverdata);
+ if(sasl->mutual_auth) {
+ /* Decode the user token challenge and create the optional response
+ message */
+ result = Curl_sasl_create_gssapi_user_message(data, NULL, NULL, NULL,
+ sasl->mutual_auth,
+ serverdata, &conn->krb5,
+ &resp, &len);
+ newstate = SASL_GSSAPI_NO_DATA;
+ }
+ else
+ /* Decode the security challenge and create the response message */
+ result = Curl_sasl_create_gssapi_security_message(data, serverdata,
+ &conn->krb5,
+ &resp, &len);
+ break;
+ case SASL_GSSAPI_NO_DATA:
+ sasl->params->getmessage(data->state.buffer, &serverdata);
+ /* Decode the security challenge and create the response message */
+ result = Curl_sasl_create_gssapi_security_message(data, serverdata,
+ &conn->krb5,
+ &resp, &len);
+ break;
+#endif
+
+ case SASL_XOAUTH2:
+ /* Create the authorisation message */
+ result = sasl_create_xoauth2_message(data, conn->user,
+ conn->xoauth2_bearer, &resp, &len);
+ break;
+ case SASL_CANCEL:
+ /* Remove the offending mechanism from the supported list */
+ sasl->authmechs ^= sasl->authused;
+
+ /* Start an alternative SASL authentication */
+ result = Curl_sasl_start(sasl, conn, sasl->force_ir, progress);
+ newstate = sasl->state; /* Use state from Curl_sasl_start() */
+ break;
+ default:
+ failf(data, "Unsupported SASL authentication mechanism");
+ result = CURLE_UNSUPPORTED_PROTOCOL; /* Should not happen */
+ break;
+ }
+
+ switch(result) {
+ case CURLE_BAD_CONTENT_ENCODING:
+ /* Cancel dialog */
+ result = sasl->params->sendcont(conn, "*");
+ newstate = SASL_CANCEL;
+ break;
+ case CURLE_OK:
+ if(resp)
+ result = sasl->params->sendcont(conn, resp);
+ break;
+ default:
+ newstate = SASL_STOP; /* Stop on error */
+ *progress = SASL_DONE;
+ break;
+ }
+
+ free(resp);
+
+ state(sasl, conn, newstate);
+
+ return result;
+}
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