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imap-send.c
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/*
* git-imap-send - drops patches into an imap Drafts folder
* derived from isync/mbsync - mailbox synchronizer
*
* Copyright (C) 2000-2002 Michael R. Elkins <[email protected]>
* Copyright (C) 2002-2004 Oswald Buddenhagen <[email protected]>
* Copyright (C) 2004 Theodore Y. Ts'o <[email protected]>
* Copyright (C) 2006 Mike McCormack
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "cache.h"
#include "config.h"
#include "credential.h"
#include "exec-cmd.h"
#include "run-command.h"
#include "parse-options.h"
#ifdef NO_OPENSSL
typedef void *SSL;
#endif
#ifdef USE_CURL_FOR_IMAP_SEND
#include "http.h"
#endif
#if defined(USE_CURL_FOR_IMAP_SEND)
/* Always default to curl if it's available. */
#define USE_CURL_DEFAULT 1
#else
/* We don't have curl, so continue to use the historical implementation */
#define USE_CURL_DEFAULT 0
#endif
static int verbosity;
static int use_curl = USE_CURL_DEFAULT;
static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] [--[no-]curl] < <mbox>", NULL };
static struct option imap_send_options[] = {
OPT__VERBOSITY(&verbosity),
OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
OPT_END()
};
#undef DRV_OK
#define DRV_OK 0
#define DRV_MSG_BAD -1
#define DRV_BOX_BAD -2
#define DRV_STORE_BAD -3
__attribute__((format (printf, 1, 2)))
static void imap_info(const char *, ...);
__attribute__((format (printf, 1, 2)))
static void imap_warn(const char *, ...);
static char *next_arg(char **);
__attribute__((format (printf, 3, 4)))
static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
static int nfvasprintf(char **strp, const char *fmt, va_list ap)
{
int len;
char tmp[8192];
len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
if (len < 0)
die("Fatal: Out of memory");
if (len >= sizeof(tmp))
die("imap command overflow!");
*strp = xmemdupz(tmp, len);
return len;
}
struct imap_server_conf {
char *name;
char *tunnel;
char *host;
int port;
char *folder;
char *user;
char *pass;
int use_ssl;
int ssl_verify;
int use_html;
char *auth_method;
};
static struct imap_server_conf server = {
NULL, /* name */
NULL, /* tunnel */
NULL, /* host */
0, /* port */
NULL, /* folder */
NULL, /* user */
NULL, /* pass */
0, /* use_ssl */
1, /* ssl_verify */
0, /* use_html */
NULL, /* auth_method */
};
struct imap_socket {
int fd[2];
SSL *ssl;
};
struct imap_buffer {
struct imap_socket sock;
int bytes;
int offset;
char buf[1024];
};
struct imap_cmd;
struct imap {
int uidnext; /* from SELECT responses */
unsigned caps, rcaps; /* CAPABILITY results */
/* command queue */
int nexttag, num_in_progress, literal_pending;
struct imap_cmd *in_progress, **in_progress_append;
struct imap_buffer buf; /* this is BIG, so put it last */
};
struct imap_store {
/* currently open mailbox */
const char *name; /* foreign! maybe preset? */
int uidvalidity;
struct imap *imap;
const char *prefix;
};
struct imap_cmd_cb {
int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
void *ctx;
char *data;
int dlen;
int uid;
};
struct imap_cmd {
struct imap_cmd *next;
struct imap_cmd_cb cb;
char *cmd;
int tag;
};
#define CAP(cap) (imap->caps & (1 << (cap)))
enum CAPABILITY {
NOLOGIN = 0,
UIDPLUS,
LITERALPLUS,
NAMESPACE,
STARTTLS,
AUTH_CRAM_MD5
};
static const char *cap_list[] = {
"LOGINDISABLED",
"UIDPLUS",
"LITERAL+",
"NAMESPACE",
"STARTTLS",
"AUTH=CRAM-MD5",
};
#define RESP_OK 0
#define RESP_NO 1
#define RESP_BAD 2
static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
#ifndef NO_OPENSSL
static void ssl_socket_perror(const char *func)
{
fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
}
#endif
static void socket_perror(const char *func, struct imap_socket *sock, int ret)
{
#ifndef NO_OPENSSL
if (sock->ssl) {
int sslerr = SSL_get_error(sock->ssl, ret);
switch (sslerr) {
case SSL_ERROR_NONE:
break;
case SSL_ERROR_SYSCALL:
perror("SSL_connect");
break;
default:
ssl_socket_perror("SSL_connect");
break;
}
} else
#endif
{
if (ret < 0)
perror(func);
else
fprintf(stderr, "%s: unexpected EOF\n", func);
}
}
#ifdef NO_OPENSSL
static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
{
fprintf(stderr, "SSL requested but SSL support not compiled in\n");
return -1;
}
#else
static int host_matches(const char *host, const char *pattern)
{
if (pattern[0] == '*' && pattern[1] == '.') {
pattern += 2;
if (!(host = strchr(host, '.')))
return 0;
host++;
}
return *host && *pattern && !strcasecmp(host, pattern);
}
static int verify_hostname(X509 *cert, const char *hostname)
{
int len;
X509_NAME *subj;
char cname[1000];
int i, found;
STACK_OF(GENERAL_NAME) *subj_alt_names;
/* try the DNS subjectAltNames */
found = 0;
if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
for (i = 0; !found && i < num_subj_alt_names; i++) {
GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
if (subj_alt_name->type == GEN_DNS &&
strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
found = 1;
}
sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
}
if (found)
return 0;
/* try the common name */
if (!(subj = X509_get_subject_name(cert)))
return error("cannot get certificate subject");
if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
return error("cannot get certificate common name");
if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
return 0;
return error("certificate owner '%s' does not match hostname '%s'",
cname, hostname);
}
static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
{
#if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
const SSL_METHOD *meth;
#else
SSL_METHOD *meth;
#endif
SSL_CTX *ctx;
int ret;
X509 *cert;
SSL_library_init();
SSL_load_error_strings();
meth = SSLv23_method();
if (!meth) {
ssl_socket_perror("SSLv23_method");
return -1;
}
ctx = SSL_CTX_new(meth);
if (!ctx) {
ssl_socket_perror("SSL_CTX_new");
return -1;
}
if (use_tls_only)
SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
if (verify)
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
if (!SSL_CTX_set_default_verify_paths(ctx)) {
ssl_socket_perror("SSL_CTX_set_default_verify_paths");
return -1;
}
sock->ssl = SSL_new(ctx);
if (!sock->ssl) {
ssl_socket_perror("SSL_new");
return -1;
}
if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
ssl_socket_perror("SSL_set_rfd");
return -1;
}
if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
ssl_socket_perror("SSL_set_wfd");
return -1;
}
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
/*
* SNI (RFC4366)
* OpenSSL does not document this function, but the implementation
* returns 1 on success, 0 on failure after calling SSLerr().
*/
ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
if (ret != 1)
warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
#endif
ret = SSL_connect(sock->ssl);
if (ret <= 0) {
socket_perror("SSL_connect", sock, ret);
return -1;
}
if (verify) {
/* make sure the hostname matches that of the certificate */
cert = SSL_get_peer_certificate(sock->ssl);
if (!cert)
return error("unable to get peer certificate.");
if (verify_hostname(cert, server.host) < 0)
return -1;
}
return 0;
}
#endif
static int socket_read(struct imap_socket *sock, char *buf, int len)
{
ssize_t n;
#ifndef NO_OPENSSL
if (sock->ssl)
n = SSL_read(sock->ssl, buf, len);
else
#endif
n = xread(sock->fd[0], buf, len);
if (n <= 0) {
socket_perror("read", sock, n);
close(sock->fd[0]);
close(sock->fd[1]);
sock->fd[0] = sock->fd[1] = -1;
}
return n;
}
static int socket_write(struct imap_socket *sock, const char *buf, int len)
{
int n;
#ifndef NO_OPENSSL
if (sock->ssl)
n = SSL_write(sock->ssl, buf, len);
else
#endif
n = write_in_full(sock->fd[1], buf, len);
if (n != len) {
socket_perror("write", sock, n);
close(sock->fd[0]);
close(sock->fd[1]);
sock->fd[0] = sock->fd[1] = -1;
}
return n;
}
static void socket_shutdown(struct imap_socket *sock)
{
#ifndef NO_OPENSSL
if (sock->ssl) {
SSL_shutdown(sock->ssl);
SSL_free(sock->ssl);
}
#endif
close(sock->fd[0]);
close(sock->fd[1]);
}
/* simple line buffering */
static int buffer_gets(struct imap_buffer *b, char **s)
{
int n;
int start = b->offset;
*s = b->buf + start;
for (;;) {
/* make sure we have enough data to read the \r\n sequence */
if (b->offset + 1 >= b->bytes) {
if (start) {
/* shift down used bytes */
*s = b->buf;
assert(start <= b->bytes);
n = b->bytes - start;
if (n)
memmove(b->buf, b->buf + start, n);
b->offset -= start;
b->bytes = n;
start = 0;
}
n = socket_read(&b->sock, b->buf + b->bytes,
sizeof(b->buf) - b->bytes);
if (n <= 0)
return -1;
b->bytes += n;
}
if (b->buf[b->offset] == '\r') {
assert(b->offset + 1 < b->bytes);
if (b->buf[b->offset + 1] == '\n') {
b->buf[b->offset] = 0; /* terminate the string */
b->offset += 2; /* next line */
if (0 < verbosity)
puts(*s);
return 0;
}
}
b->offset++;
}
/* not reached */
}
static void imap_info(const char *msg, ...)
{
va_list va;
if (0 <= verbosity) {
va_start(va, msg);
vprintf(msg, va);
va_end(va);
fflush(stdout);
}
}
static void imap_warn(const char *msg, ...)
{
va_list va;
if (-2 < verbosity) {
va_start(va, msg);
vfprintf(stderr, msg, va);
va_end(va);
}
}
static char *next_arg(char **s)
{
char *ret;
if (!s || !*s)
return NULL;
while (isspace((unsigned char) **s))
(*s)++;
if (!**s) {
*s = NULL;
return NULL;
}
if (**s == '"') {
++*s;
ret = *s;
*s = strchr(*s, '"');
} else {
ret = *s;
while (**s && !isspace((unsigned char) **s))
(*s)++;
}
if (*s) {
if (**s)
*(*s)++ = 0;
if (!**s)
*s = NULL;
}
return ret;
}
static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
{
int ret;
va_list va;
va_start(va, fmt);
if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
BUG("buffer too small. Please report a bug.");
va_end(va);
return ret;
}
static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
struct imap_cmd_cb *cb,
const char *fmt, va_list ap)
{
struct imap *imap = ctx->imap;
struct imap_cmd *cmd;
int n, bufl;
char buf[1024];
cmd = xmalloc(sizeof(struct imap_cmd));
nfvasprintf(&cmd->cmd, fmt, ap);
cmd->tag = ++imap->nexttag;
if (cb)
cmd->cb = *cb;
else
memset(&cmd->cb, 0, sizeof(cmd->cb));
while (imap->literal_pending)
get_cmd_result(ctx, NULL);
if (!cmd->cb.data)
bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
else
bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
cmd->tag, cmd->cmd, cmd->cb.dlen,
CAP(LITERALPLUS) ? "+" : "");
if (0 < verbosity) {
if (imap->num_in_progress)
printf("(%d in progress) ", imap->num_in_progress);
if (!starts_with(cmd->cmd, "LOGIN"))
printf(">>> %s", buf);
else
printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
}
if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
free(cmd->cmd);
free(cmd);
if (cb)
free(cb->data);
return NULL;
}
if (cmd->cb.data) {
if (CAP(LITERALPLUS)) {
n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
free(cmd->cb.data);
if (n != cmd->cb.dlen ||
socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
free(cmd->cmd);
free(cmd);
return NULL;
}
cmd->cb.data = NULL;
} else
imap->literal_pending = 1;
} else if (cmd->cb.cont)
imap->literal_pending = 1;
cmd->next = NULL;
*imap->in_progress_append = cmd;
imap->in_progress_append = &cmd->next;
imap->num_in_progress++;
return cmd;
}
__attribute__((format (printf, 3, 4)))
static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
const char *fmt, ...)
{
va_list ap;
struct imap_cmd *cmdp;
va_start(ap, fmt);
cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
va_end(ap);
if (!cmdp)
return RESP_BAD;
return get_cmd_result(ctx, cmdp);
}
__attribute__((format (printf, 3, 4)))
static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
const char *fmt, ...)
{
va_list ap;
struct imap_cmd *cmdp;
va_start(ap, fmt);
cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
va_end(ap);
if (!cmdp)
return DRV_STORE_BAD;
switch (get_cmd_result(ctx, cmdp)) {
case RESP_BAD: return DRV_STORE_BAD;
case RESP_NO: return DRV_MSG_BAD;
default: return DRV_OK;
}
}
static int skip_imap_list_l(char **sp, int level)
{
char *s = *sp;
for (;;) {
while (isspace((unsigned char)*s))
s++;
if (level && *s == ')') {
s++;
break;
}
if (*s == '(') {
/* sublist */
s++;
if (skip_imap_list_l(&s, level + 1))
goto bail;
} else if (*s == '"') {
/* quoted string */
s++;
for (; *s != '"'; s++)
if (!*s)
goto bail;
s++;
} else {
/* atom */
for (; *s && !isspace((unsigned char)*s); s++)
if (level && *s == ')')
break;
}
if (!level)
break;
if (!*s)
goto bail;
}
*sp = s;
return 0;
bail:
return -1;
}
static void skip_list(char **sp)
{
skip_imap_list_l(sp, 0);
}
static void parse_capability(struct imap *imap, char *cmd)
{
char *arg;
unsigned i;
imap->caps = 0x80000000;
while ((arg = next_arg(&cmd)))
for (i = 0; i < ARRAY_SIZE(cap_list); i++)
if (!strcmp(cap_list[i], arg))
imap->caps |= 1 << i;
imap->rcaps = imap->caps;
}
static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
char *s)
{
struct imap *imap = ctx->imap;
char *arg, *p;
if (!s || *s != '[')
return RESP_OK; /* no response code */
s++;
if (!(p = strchr(s, ']'))) {
fprintf(stderr, "IMAP error: malformed response code\n");
return RESP_BAD;
}
*p++ = 0;
arg = next_arg(&s);
if (!arg) {
fprintf(stderr, "IMAP error: empty response code\n");
return RESP_BAD;
}
if (!strcmp("UIDVALIDITY", arg)) {
if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
return RESP_BAD;
}
} else if (!strcmp("UIDNEXT", arg)) {
if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
return RESP_BAD;
}
} else if (!strcmp("CAPABILITY", arg)) {
parse_capability(imap, s);
} else if (!strcmp("ALERT", arg)) {
/* RFC2060 says that these messages MUST be displayed
* to the user
*/
for (; isspace((unsigned char)*p); p++);
fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
} else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
!(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
return RESP_BAD;
}
}
return RESP_OK;
}
static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
{
struct imap *imap = ctx->imap;
struct imap_cmd *cmdp, **pcmdp;
char *cmd;
const char *arg, *arg1;
int n, resp, resp2, tag;
for (;;) {
if (buffer_gets(&imap->buf, &cmd))
return RESP_BAD;
arg = next_arg(&cmd);
if (!arg) {
fprintf(stderr, "IMAP error: empty response\n");
return RESP_BAD;
}
if (*arg == '*') {
arg = next_arg(&cmd);
if (!arg) {
fprintf(stderr, "IMAP error: unable to parse untagged response\n");
return RESP_BAD;
}
if (!strcmp("NAMESPACE", arg)) {
/* rfc2342 NAMESPACE response. */
skip_list(&cmd); /* Personal mailboxes */
skip_list(&cmd); /* Others' mailboxes */
skip_list(&cmd); /* Shared mailboxes */
} else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
!strcmp("NO", arg) || !strcmp("BYE", arg)) {
if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
return resp;
} else if (!strcmp("CAPABILITY", arg)) {
parse_capability(imap, cmd);
} else if ((arg1 = next_arg(&cmd))) {
; /*
* Unhandled response-data with at least two words.
* Ignore it.
*
* NEEDSWORK: Previously this case handled '<num> EXISTS'
* and '<num> RECENT' but as a probably-unintended side
* effect it ignores other unrecognized two-word
* responses. imap-send doesn't ever try to read
* messages or mailboxes these days, so consider
* eliminating this case.
*/
} else {
fprintf(stderr, "IMAP error: unable to parse untagged response\n");
return RESP_BAD;
}
} else if (!imap->in_progress) {
fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
return RESP_BAD;
} else if (*arg == '+') {
/* This can happen only with the last command underway, as
it enforces a round-trip. */
cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
offsetof(struct imap_cmd, next));
if (cmdp->cb.data) {
n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
FREE_AND_NULL(cmdp->cb.data);
if (n != (int)cmdp->cb.dlen)
return RESP_BAD;
} else if (cmdp->cb.cont) {
if (cmdp->cb.cont(ctx, cmdp, cmd))
return RESP_BAD;
} else {
fprintf(stderr, "IMAP error: unexpected command continuation request\n");
return RESP_BAD;
}
if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
return RESP_BAD;
if (!cmdp->cb.cont)
imap->literal_pending = 0;
if (!tcmd)
return DRV_OK;
} else {
tag = atoi(arg);
for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
if (cmdp->tag == tag)
goto gottag;
fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
return RESP_BAD;
gottag:
if (!(*pcmdp = cmdp->next))
imap->in_progress_append = pcmdp;
imap->num_in_progress--;
if (cmdp->cb.cont || cmdp->cb.data)
imap->literal_pending = 0;
arg = next_arg(&cmd);
if (!arg)
arg = "";
if (!strcmp("OK", arg))
resp = DRV_OK;
else {
if (!strcmp("NO", arg))
resp = RESP_NO;
else /*if (!strcmp("BAD", arg))*/
resp = RESP_BAD;
fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
!starts_with(cmdp->cmd, "LOGIN") ?
cmdp->cmd : "LOGIN <user> <pass>",
arg, cmd ? cmd : "");
}
if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
resp = resp2;
if (cmdp->cb.done)
cmdp->cb.done(ctx, cmdp, resp);
free(cmdp->cb.data);
free(cmdp->cmd);
free(cmdp);
if (!tcmd || tcmd == cmdp)
return resp;
}
}
/* not reached */
}
static void imap_close_server(struct imap_store *ictx)
{
struct imap *imap = ictx->imap;
if (imap->buf.sock.fd[0] != -1) {
imap_exec(ictx, NULL, "LOGOUT");
socket_shutdown(&imap->buf.sock);
}
free(imap);
}
static void imap_close_store(struct imap_store *ctx)
{
imap_close_server(ctx);
free(ctx);
}
#ifndef NO_OPENSSL
/*
* hexchar() and cram() functions are based on the code from the isync
* project (http://isync.sf.net/).
*/
static char hexchar(unsigned int b)
{
return b < 10 ? '0' + b : 'a' + (b - 10);
}
#define ENCODED_SIZE(n) (4 * DIV_ROUND_UP((n), 3))
static char *cram(const char *challenge_64, const char *user, const char *pass)
{
int i, resp_len, encoded_len, decoded_len;
unsigned char hash[16];
char hex[33];
char *response, *response_64, *challenge;
/*
* length of challenge_64 (i.e. base-64 encoded string) is a good
* enough upper bound for challenge (decoded result).
*/
encoded_len = strlen(challenge_64);
challenge = xmalloc(encoded_len);
decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
(unsigned char *)challenge_64, encoded_len);
if (decoded_len < 0)
die("invalid challenge %s", challenge_64);
if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
die("HMAC error");
hex[32] = 0;
for (i = 0; i < 16; i++) {
hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
hex[2 * i + 1] = hexchar(hash[i] & 0xf);
}
/* response: "<user> <digest in hex>" */
response = xstrfmt("%s %s", user, hex);
resp_len = strlen(response);
response_64 = xmallocz(ENCODED_SIZE(resp_len));
encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
(unsigned char *)response, resp_len);
if (encoded_len < 0)
die("EVP_EncodeBlock error");
return (char *)response_64;
}
#else
static char *cram(const char *challenge_64, const char *user, const char *pass)
{
die("If you want to use CRAM-MD5 authenticate method, "
"you have to build git-imap-send with OpenSSL library.");
}
#endif
static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
{
int ret;
char *response;
response = cram(prompt, server.user, server.pass);
ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
if (ret != strlen(response))
return error("IMAP error: sending response failed");
free(response);
return 0;
}
static void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
{
if (srvc->user && srvc->pass)
return;
cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
cred->host = xstrdup(srvc->host);
cred->username = xstrdup_or_null(srvc->user);
cred->password = xstrdup_or_null(srvc->pass);
credential_fill(cred);
if (!srvc->user)
srvc->user = xstrdup(cred->username);
if (!srvc->pass)
srvc->pass = xstrdup(cred->password);
}
static struct imap_store *imap_open_store(struct imap_server_conf *srvc, char *folder)
{
struct credential cred = CREDENTIAL_INIT;
struct imap_store *ctx;
struct imap *imap;
char *arg, *rsp;
int s = -1, preauth;
ctx = xcalloc(1, sizeof(*ctx));
ctx->imap = imap = xcalloc(1, sizeof(*imap));
imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
imap->in_progress_append = &imap->in_progress;
/* open connection to IMAP server */
if (srvc->tunnel) {
struct child_process tunnel = CHILD_PROCESS_INIT;
imap_info("Starting tunnel '%s'... ", srvc->tunnel);
argv_array_push(&tunnel.args, srvc->tunnel);
tunnel.use_shell = 1;
tunnel.in = -1;
tunnel.out = -1;
if (start_command(&tunnel))
die("cannot start proxy %s", srvc->tunnel);
imap->buf.sock.fd[0] = tunnel.out;
imap->buf.sock.fd[1] = tunnel.in;
imap_info("ok\n");
} else {
#ifndef NO_IPV6
struct addrinfo hints, *ai0, *ai;
int gai;
char portstr[6];
xsnprintf(portstr, sizeof(portstr), "%d", srvc->port);
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;