[ihttpd] / SOURCES / index.bin.c

/**
 * 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 3 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/>.
 *
 * Written by Raphaël Gertz <rapsys@rapsys.eu>
 */

//Required for mkostemp, O_CLOEXEC, strdup, memmem
#define _GNU_SOURCE

//Required for SSIZE_MAX, LONG_MAX
#include <limits.h>

//Required for pid_t, kill, waitpid
#include <sys/wait.h>
#include <signal.h>

//Required for printf, sscanf, sprintf
#include <stdio.h>

//Required for struct stat, fstat
#include <sys/stat.h>

//Required for closedir, DIR, opendir, readdir, struct dirent
#include <dirent.h>

//Required for close, dup2, execve, fork, read, STDERR_FILENO, STDOUT_FILENO, STDIN_FILENO, write
#include <unistd.h>

//Required for open, O_CLOEXEC, O_NOATIME, O_NOFOLLOW
#include <fcntl.h>

//Required for atoi, calloc, exit, EXIT_FAILURE, EXIT_SUCCESS, free, getenv, malloc, realloc
#include <stdlib.h>

//Required for memchr, memcpy, memmem, strdup, strlen, strncmp
#include <string.h>

//Required for bool
#include <stdbool.h>

//Required for nanosleep
#include <time.h>

//Default passphrase max size
#define DEFAULT_PASSPHRASE_SIZE_MAX 512

//Default keyfile max size
//XXX: file should be maximum 8192*1024-1 character long
#define DEFAULT_KEYFILE_SIZE_MAX (8192 * 1024)

//Default crypttab
#define CRYPTTAB "/etc/crypttab"

//Default cryptsetup
#define CRYPTSETUP "/sbin/cryptsetup"

//Default pid file
#define IHTTPDPID "/run/ihttpd/ihttpd.pid"

//Default systemd ask-password dir
#define ASKPASSWORDDIR "/run/systemd/ask-password"

//Define child log
#define ASKPASSWORDLOG "/run/ihttpd/log/child.askpassword.log"
#define IHTTPDLOG "/run/ihttpd/log/child.ihttpd.log"

//Create struct for http error status
struct httpStatusStruct {
        int value;
        char *description;
};

//Declare http error status array
const struct httpStatusStruct httpStatuses[] = {
        {200, "OK"},
        {400, "Bad Request"},
        {405, "Method Not Allowed"},
        {411, "Length Required"},
        {500, "Internal Server Error"}
};

/**
 * Prototype
 */
void die(const int, const char*);
void header(const int, const char*);
void showForm(const char*, const int, const int);
int extractValue(char**, int*, char*, int);
int extractLuksDevice(char**, char**);
int extractIHttpdPid(pid_t *);
int extractAskPasswordPid(pid_t *);

/**
 * Die with error
 */
void die(const int code, const char *err) {
        //TODO: see if we add a nice text/html template ?
        //Send content as text
        header(code, "text/plain");
        //Print error line if available
        if (err != NULL)
                printf("%s", err);
        //Flush all
        if (fflush(NULL) == -1) {
                perror("fflush");
        }
        //Exit with failure code
        exit(EXIT_FAILURE);
}

/**
 * Send header
 */
void header(const int code, const char *ctype) {
        int k;
        switch(code) {
                case 400:
                        k = 1;
                        break;
                case 405:
                        k = 2;
                        break;
                case 411:
                        k = 3;
                        break;
                case 500:
                        k = 4;
                        break;
                default:
                        k = 0;
        }
        //Send http status
        printf("Status: %d %s\r\n", httpStatuses[k].value, httpStatuses[k].description);
        //Make sure no cache
        printf("Cache-Control: no-cache, no-store, must-revalidate\r\n");
        printf("Pragma: no-cache\r\n");
        printf("Expires: 0\r\n");
        printf("X-Robots-Tag: noindex, nofollow, noarchive, nosnippet, noodp\r\n");
        printf("Content-type: %s\r\n\r\n", ctype);
}

/**
 * Show form
 */
void showForm(const char *requestUri, const int keyfileSizeMax, const int passphraseSizeMax) {
        header(200, "text/html");
        printf("<!DOCTYPE HTML>\r\n");
        printf("<html>\r\n");
        printf("<head><title>Key upload form</title></head>\r\n");
        printf("<body>\r\n");
        printf("<div id=\"wrapper\">\r\n");
        printf("<form enctype=\"multipart/form-data\" action=\"%s\" method=\"post\"><fieldset><legend>Upload key</legend><label for=\"file\"></label><input type=\"hidden\" name=\"MAX_FILE_SIZE\" value=\"%d\" /><input id=\"file\" type=\"file\" name=\"key\" /><input type=\"submit\" value=\"Send\" /></fieldset></form>\r\n", requestUri, keyfileSizeMax);
        printf("<form action=\"%s\" method=\"post\"><fieldset><legend>Type key</legend><label for=\"password\"></label><input id=\"password\" type=\"password\" name=\"key\" maxlength=\"%d\" /><input type=\"submit\" value=\"Send\" /></fieldset></form>\r\n", requestUri, passphraseSizeMax);
        printf("</div>\r\n");
        printf("</body>\r\n");
        printf("</html>\r\n");
}

/**
 * Extract value
 */
int extractValue(char **value, int *valueLength, char *contentType, int contentLength) {
        //Handle application/x-www-form-urlencoded request
        if (contentType != NULL && !strncmp(contentType, "application/x-www-form-urlencoded", 33)) {
                //Indexes and return
                int i, k, v, r;
                //Declare key and buf
                char *key, *buf;
                //Allocate key
                if ((key = malloc(4*sizeof(char))) == NULL) {
                        //Unable to allocate key
                        return -1;
                }
                //Allocate buf to maximum possible value size + 1 for trailing \0
                if ((buf = calloc(1, (DEFAULT_PASSPHRASE_SIZE_MAX+1)*sizeof(char))) == NULL) {
                        //Unable to allocate value
                        free(key);
                        return -2;
                }
                //Char buffer
                char d = '\0';
                //Char delimiter
                //XXX: initialised as & for new key, becomes = when fetching value
                char delim = '&';
                for (i = 0, k = 0, v = 0; i < contentLength; i++) {
                        //Safeguard against a value greater than DEFAULT_PASSPHRASE_SIZE_MAX
                        //XXX: this should never happen because we should be protected by contentLength already
                        if (v == DEFAULT_PASSPHRASE_SIZE_MAX+1) {
                                //Invalid value
                                free(key);
                                free(buf);
                                return -3;
                        }
                        //Read one character from stdin
                        r = read(STDIN_FILENO, &d, 1);
                        //Handle errors
                        if (r < 0) {
                                //Error while parsing post data
                                free(key);
                                free(buf);
                                return -4;
                        } else if (r == 0) {
                                //Partial receive
                                free(key);
                                free(buf);
                                return -5;
                        }
                        //Handle case where key has an other name
                        if (i == 3) {
                                //Check key is "key" and we get '=' as new char and assign delim to =
                                if (strncmp(key, "key", 3) || (delim = d) != '=') {
                                        //Invalid key
                                        free(key);
                                        free(buf);
                                        return -6;
                                }
                        //Handle key or value separator in query string
                        } else if (d == '&' || d == '=') {
                                //Invalid query string
                                free(key);
                                free(buf);
                                return -7;
                        //Handle a value
                        } else {
                                //Save key char
                                if (delim == '&') {
                                        key[k] = d;
                                        k++;
                                //Save buf char
                                } else {
                                        buf[v] = d;
                                        v++;
                                }
                        }
                }
                //Free key
                free(key);
                //Unescape and reduce value if not empty
                if (v > 0) {
                        //Declare iterators
                        int l,m, s = v;
                        //Loop on value and reduce length on the fly
                        for(l=0,m=0; m < v; l++,m++) {
                                //Replace + with space
                                if (buf[m] == '+') {
                                        buf[l] = ' ';
                                //Skip partial present %XX
                                } else if (
                                        //Assign char
                                        (buf[l] = buf[m]) == '%' &&
                                        //Check we didn't reach valueStrLength
                                        (m+2 < v) &&
                                        //Check next two digits are valid
                                        ((buf[m+1] >= 'A' && buf[m+1] <= 'F') || (buf[m+1] >= 'a' && buf[m+1] <= 'f') || (buf[m+1] >= '0' && buf[m+1] <= '9')) &&
                                        ((buf[m+2] >= 'A' && buf[m+2] <= 'F') || (buf[m+2] >= 'a' && buf[m+2] <= 'f') || (buf[m+2] >= '0' && buf[m+2] <= '9'))
                                ) {
                                        buf[l] = (buf[m+1] >= 'A' ? (buf[m+1] & 0xdf) - 'A' + 10 : buf[m+1] - '0') * 16 + (buf[m+2] >= 'A' ? (buf[m+2] & 0xdf) - 'A' + 10 : buf[m+2] - '0');
                                        m += 2;
                                        s -= 2;
                                }
                        }
                        //Set value length
                        *valueLength = s;
                        //Alloc value
                        if ((*value = malloc((*valueLength)*sizeof(char))) == NULL) {
                                //Unable to alloc value
                                free(key);
                                free(buf);
                                return -8;
                        }
                        //Copy value
                        memcpy(*value, buf, *valueLength);
                }
                //Free buf
                free(buf);
        //Handle multipart/form-data request
        } else if (contentType != NULL && !strncmp(contentType, "multipart/form-data", 19)) {
                //Indexes and return
                int b, s, r;
                //Boundary length
                int boundaryLength = strlen(contentType) - 30 + 1;
                //Client send LF ending without CR
                int lfstyle = 0;
                //Declare boundary
                char *boundary;
                //Allocate boundary
                if ((boundary = calloc(1, boundaryLength*sizeof(char))) == NULL) {
                        //Unable to allocate boundary
                        return -9;
                }
                //Extract boundary
                memcpy(boundary, contentType + 30, boundaryLength - 1);

                //Declare buffers
                char *start, *buf;
                //Allocate buffer
                if ((buf = malloc(contentLength*sizeof(char))) == NULL) {
                        //Unable to allocate buffer
                        free(boundary);
                        return -10;
                }
                //Char buffer
                char d = '\0';

                //Loop
                for (b = 0, s = 0; b < contentLength; b++) {
                        //Detect possible boundary
                        //XXX: b is boundaryLength-1 + 2 after s
                        //XXX: d will be a CR(CRLF line ending) or LF(LF line ending) or -(of final --)
                        if (b == s + 2 + boundaryLength - 1 && !strncmp(boundary, buf + b - boundaryLength + 1, boundaryLength - 1)) {
                                //Only after first boundary match
                                if (s > 0) {
                                        //Trim line jump
                                        if (start[0] == '\r' && start[1] == '\n') {
                                                start += 2;
                                                lfstyle = 1;
                                        } else if (start[0] == '\n') {
                                                start++;
                                        }
                                        //Found flag
                                        bool found = false;
                                        //Allocate pointers
                                        char *new = start, *prev = start, *name = NULL;
                                        //Search for a new line
                                        while ((new = memchr(new, '\n', b - (new - buf)))) {
                                                //Jump to first character after new line
                                                new++;
                                                //Init line length
                                                int lineLength = new - prev - 1;
                                                //Remove chariage return if necessary
                                                if (prev[lineLength] == '\r') {
                                                        lineLength--;
                                                        lfstyle = 1;
                                                }
                                                //Break loop after headers end
                                                if (lineLength == 1) {
                                                        break;
                                                }
                                                //Allocate a name buf of maximum line length
                                                //XXX: need to be filled with zero as we don't know what will comes with sscanf call and we rely on strlen
                                                if ((name = calloc(1, lineLength*sizeof(char))) == NULL) {
                                                        //Unable to allocate name
                                                        free(boundary);
                                                        free(buf);
                                                        return -11;
                                                }
                                                //Search for name
                                                if (sscanf(prev, "Content-Disposition: form-data; name=\"%[^\"]\"", name)) {
                                                        //Realloc name
                                                        if ((name = realloc(name, (strlen(name)+1)*sizeof(char))) == NULL) {
                                                                //Unable to reduce name
                                                                free(boundary);
                                                                free(buf);
                                                                free(name);
                                                                return -12;
                                                        }
                                                        if (!strncmp(name, "key", 3)) {
                                                                found = true;
                                                        }
                                                }
                                                //Free name
                                                free(name);
                                                //Jump to next one
                                                prev = new;
                                        }
                                        //Init value if found
                                        if (found) {
                                                //Declare end
                                                char *end = buf + b - boundaryLength - 3;
                                                //Remove CR at end if provided
                                                //XXX: only remove CR at end if we encountered one before
                                                if (lfstyle) {
                                                        end++;
                                                }
                                                //On too big keyfile
                                                if (end - new - 1 >= DEFAULT_KEYFILE_SIZE_MAX) {
                                                        //Keyfile too large
                                                        free(boundary);
                                                        free(buf);
                                                        return -13;
                                                }
                                                //On non empty value
                                                if (end - new > 1) {
                                                        //Set value length
                                                        *valueLength = end - new - 1;
                                                        //Allocate value
                                                        if ((*value = malloc((*valueLength)*sizeof(char))) == NULL) {
                                                                //Unable to allocate value
                                                                free(boundary);
                                                                free(buf);
                                                                return -14;
                                                        }
                                                        //Copy value
                                                        memcpy(*value, new, *valueLength);
                                                }
                                        }
                                }
                                //Set start to matched boundary
                                start = buf + b;
                        }
                        //Read one character from stdin
                        r = read(STDIN_FILENO, &d, 1);
                        //Handle errors
                        if (r < 0) {
                                //Error while parsing post data
                                free(boundary);
                                free(buf);
                                return -15;
                        } else if (r == 0) {
                                //Partial receive
                                free(boundary);
                                free(buf);
                                return -16;
                        }
                        //New line case
                        if (d == '\n') {
                                //Store new possible boundary start
                                s = b + 1;
                        }
                        buf[b] = d;
                }

                //Free buffers
                free(boundary);
                free(buf);
        //Unhandled request
        } else {
                return -17;
        }

        //Send value
        return 0;
}

/**
 * Extract luks and device
 */
int extractLuksDevice(char **luks, char **device) {
        //Declare file descriptor
        int fd, bufLength;
        //Declare buf, device and luks pointer
        char *buf, *d, *l;
        //Declare stat struct
        struct stat *stats;
        //Open file
        if ((fd = open(CRYPTTAB, O_RDONLY|O_NOATIME|O_NOFOLLOW|O_CLOEXEC)) == -1) {
                //Can't open crypttab file
                return -1;
        }
        //Allocate stats
        if ((stats = calloc(1, sizeof(struct stat))) == NULL) {
                //Unable to allocate stats
                return -2;
        }
        //Stat file
        if (fstat(fd, stats) == -1) {
                //Can't stat crypttab
                return -3;
        }
        //Check file size
        if ((bufLength = stats->st_size) > SSIZE_MAX) {
                //Crypttab too big
                return -4;
        }
        //Allocate buf
        if ((buf = malloc(bufLength*sizeof(char))) == NULL) {
                //Unable to allocate buf
                return -5;
        }
        //Read file
        if ((read(fd, buf, bufLength)) < bufLength) {
                //Fail to read crypttab file
                return -6;
        }
        //Close file
        close(fd);
        //Free stats buffer
        free(stats);

        //Search first separator (\s|\t) after luks
        if ((l = memchr(buf, ' ', bufLength)) == NULL && (l = memchr(buf, '     ', bufLength)) == NULL) {
                return -7;
        }
        //Jump to next char
        l++;
        //Search first separator (\s|\t) after device
        if ((d = memchr(l, ' ', bufLength - (l - buf))) == NULL && (d = memchr(l, '     ', bufLength - (l - buf))) == NULL && (d = memchr(l, '\n', bufLength - (l - buf))) == NULL) {
                return -8;
        }
        //Jump to next char
        d++;

        //Alloc luks
        if ((*luks = malloc((l - buf - 1)*sizeof(char))) == NULL) {
                return -9;
        }
        //Allocate device
        if ((*device = malloc((d  - l - 1)*sizeof(char))) == NULL) {
                //Free and reset luks
                free(luks);
                luks=NULL;
                return -10;
        }

        //Copy luks
        memcpy(*luks, buf, l  - buf - 1);
        //Terminate luks
        (*luks)[l - buf - 1] = '\0';

        //Copy device
        memcpy(*device, l, d  - l - 1);
        //Terminate device
        (*device)[d - l - 1] = '\0';

        //Free buffer
        free(buf);

        //Success
        return 0;
}

/**
 * Extract ask-password pid
 */
int extractAskPasswordPid(pid_t *pid) {
        //Declare stuct dirent
        struct dirent *entry;
        //Declare askdir
        DIR *askdir;
        //Declare found
        int found = 0;

        //Allocate dirent struct
        if ((entry = calloc(1, sizeof(struct dirent))) == NULL) {
                //Unable to allocate entry
                return -1;
        }

        //Open systemd ask-password dir
        if ((askdir = opendir(ASKPASSWORDDIR)) == NULL) {
                //Can't open ask dir
                return -2;
        }

        //Change dir
        if (chdir(ASKPASSWORDDIR) == -1) {
                //Can't change to ask dir
                return -3;
        }

        //Loop on dir content
        while((entry = readdir(askdir))) {
                //Handle each ask.XXXXXX file
                if (!strncmp(entry->d_name, "ask.", 4) && strlen(entry->d_name) == 10) {
                        //Declare file descriptor
                        int fd, bufLength;
                        //Declare buf
                        char *buf;
                        //Declare stat struct
                        struct stat *stats;
                        //Open file
                        if ((fd = open(entry->d_name, O_RDONLY|O_NOATIME|O_NOFOLLOW|O_CLOEXEC)) == -1) {
                                //Can't open ask file
                                return -4;
                        }
                        //Allocate stats
                        if ((stats = calloc(1, sizeof(struct stat))) == NULL) {
                                //Unable to allocate stats
                                return -5;
                        }
                        //Stat file
                        if (fstat(fd, stats) == -1) {
                                //Can't stat ask file
                                return -6;
                        }
                        //Check file size
                        if ((bufLength = stats->st_size) > SSIZE_MAX) {
                                //Ask file too big
                                return -7;
                        }
                        //Allocate buf
                        if ((buf = malloc(bufLength*sizeof(char))) == NULL) {
                                //Unable to allocate buf
                                return -8;
                        }
                        //Read file
                        if ((read(fd, buf, bufLength)) < bufLength) {
                                //Fail to read ask file
                                return -9;
                        }
                        //Close file
                        close(fd);
                        //Free stats buffer
                        free(stats);

                        //Allocate pointers
                        char *nl = buf, *pl = buf, *e;
                        //Allocate pid
                        *pid = 0;

                        //Search for a new line
                        while ((nl = memmem(nl, bufLength - (nl - buf), "\n", strlen("\n")))) {
                                //Jump to next char
                                nl++;

                                //Check if we have a = in line but not empty value ("=\n")
                                if ((e = memmem(pl, bufLength - (pl - buf), "=", strlen("="))) && e < nl - 2) {
                                        //Jump to next char
                                        e++;
                                        //Look for PID
                                        if (!strncmp(pl, "PID", 3)) {
                                                //Declade pid string
                                                char *pidStr;
                                                //Allocate pid string
                                                if ((pidStr = malloc((nl - e)*sizeof(char))) == NULL) {
                                                        //Unable to allocate pid string
                                                        return -10;
                                                }
                                                //Copy pid
                                                memcpy(pidStr, e, nl - e - 1);
                                                //Terminate pid string
                                                pidStr[nl - e] = '\0';
                                                //Check pid value
                                                if ((*pid = atoi(pidStr)) <= 1) {
                                                        //Invalid pid
                                                        return -11;
                                                }
                                                //Free pid string
                                                free(pidStr);
                                                //Found a valid process
                                                found++;
                                        }
                                }

                                //Jump prev line to new line
                                pl = nl;
                        }

                        //Free buffers
                        free(buf);
                }
        }

        //Close systemd ask-password dir
        if (closedir(askdir) == -1) {
                //Can't close ask dir
                return -13;
        }

        //Free entry
        free(entry);

        //Found no valid pid
        if (found == 0) {
                //No pid found
                return -14;
        //Found more than one pid
        } else if (found > 1) {
                //No pid found
                return -15;
        }

        //Success
        return 0;
}

/**
 * Extract ihttpd pid
 */
int extractIHttpdPid(pid_t *pid) {
        //Declare file descriptor
        int fd, bufLength;
        //Declare buf, device and luks pointer
        char *buf, *l, *pidStr;
        //Declare stat struct
        struct stat *stats;
        //Open file
        if ((fd = open(IHTTPDPID, O_RDONLY|O_NOATIME|O_NOFOLLOW|O_CLOEXEC)) == -1) {
                //Can't open crypttab file
                return -1;
        }
        //Allocate stats
        if ((stats = calloc(1, sizeof(struct stat))) == NULL) {
                //Unable to allocate stats
                return -2;
        }
        //Stat file
        if (fstat(fd, stats) == -1) {
                //Can't stat crypttab
                return -3;
        }
        //Check file size
        if ((bufLength = stats->st_size) > SSIZE_MAX) {
                //Crypttab too big
                return -4;
        }
        //Allocate buf
        if ((buf = malloc(bufLength*sizeof(char))) == NULL) {
                //Unable to allocate buf
                return -5;
        }
        //Read file
        if ((read(fd, buf, bufLength)) < bufLength) {
                //Fail to read crypttab file
                return -6;
        }
        //Close file
        close(fd);
        //Free stats buffer
        free(stats);

        //Search first separator (\s|\t|\n) after pid
        if ((l = memchr(buf, ' ', bufLength)) == NULL && (l = memchr(buf, '     ', bufLength)) == NULL && (l = memchr(buf, '\n', bufLength)) == NULL) {
                return -7;
        }
        //Jump to next char
        l++;

        //Alloc pid string
        if ((pidStr = malloc((l - buf - 1)*sizeof(char))) == NULL) {
                return -9;
        }

        //Copy luks
        memcpy(pidStr, buf, l  - buf - 1);
        //Terminate luks
        pidStr[l - buf - 1] = '\0';

        //Free buffer
        free(buf);

        //Store pid
        if ((*pid = atoi(pidStr)) <= 1) {
                //Invalid pid
                return -10;
        }

        //Free pid string
        free(pidStr);

        //Success
        return 0;
}

/**
 * Main function
 */
int main(int argc, char **argv) {

        //Get request method
        char *requestMethod = getenv("REQUEST_METHOD");

        //Handle unknown requests
        if (requestMethod == NULL || (strncmp(requestMethod, "GET", 3) && strncmp(requestMethod, "HEAD", 4) && strncmp(requestMethod, "POST", 4))) {
                //Send method not allowed
                die(405, "Unsupported request method");
        //Handle get and head
        } else if (!strncmp(requestMethod, "GET", 3) || !strncmp(requestMethod, "HEAD", 4)) {
                //Send form
                showForm(getenv("REQUEST_URI")?getenv("REQUEST_URI"):"/", DEFAULT_KEYFILE_SIZE_MAX, DEFAULT_PASSPHRASE_SIZE_MAX);
        //Handle post
        } else /*if (!strncmp(requestMethod, "POST", 4))*/ {
                //Return value
                int ret;

                //Child pid
                pid_t pid;

                //Value length
                //XXX: will contain number of char in value without trailing \0
                int valueLength;
                //Value string
                //XXX: will contain value without a tailing \0
                char *value = NULL;

                //Content length
                int contentLength;
                //Content length string from env
                char *contentLengthStr = getenv("CONTENT_LENGTH");
                //Content type
                char *contentType = getenv("CONTENT_TYPE");

                //Declare luks and device
                char *luks = NULL, *device = NULL;

                //Pairs of pipe for stdin, stdout and stderr
                int inPipe[2], errPipe[2];

                //Handle unknown content type
                if (contentType == NULL || (strncmp(contentType, "application/x-www-form-urlencoded", 33) && strncmp(contentType, "multipart/form-data", 19))) {
                        die(400, "Unknown content type");
                }

                //Handle invalid multipart/form-data content type
                //XXX: max boundary length is 70 as per rfc1521 & rfc2046
                if (!strncmp(contentType, "multipart/form-data", 19) && (strncmp(contentType, "multipart/form-data; boundary=", 30) || strlen(contentType) <= 30 || strlen(contentType) > 100)) {
                        die(400, "Malformed boundary in multipart/form-data request");
                }

                //Handle invalid content length
                //XXX: deny empty contentLength as chrome send a contentLength even for a device
                if (contentLengthStr == NULL || (contentLength = atoi(contentLengthStr)) <= 0) {
                        die(411, "Invalid content length");
                }

                //Handle application/x-www-form-urlencoded request length
                //XXX: limit to key=xyz where xyz can be all encoded in %XX
                if (!strncmp(contentType, "application/x-www-form-urlencoded", 33) && contentLength > (DEFAULT_PASSPHRASE_SIZE_MAX * 3 + 4)) {
                        die(400, "Invalid application/x-www-form-urlencoded request length");
                }

                //Handle multipart/form-data request length
                //XXX: limit to arbitrary 3 times the keyfile max size
                if (!strncmp(contentType, "multipart/form-data", 19) && contentLength > (DEFAULT_KEYFILE_SIZE_MAX * 3)) {
                        die(400, "Invalid multipart/form-data request length");
                }

                //Extract value
                if ((ret = extractValue(&value, &valueLength, contentType, contentLength)) < 0) {
                        die(500, "Failed to extract value");
                }


                //Extract luks and device
                if ((ret = extractLuksDevice(&luks, &device)) < 0) {
                        die(500, "Failed to extract luks and device");
                }

                //Create stdin pipe
                if (pipe(inPipe) == -1) {
                        die(500, "Failed to create in pipe");
                }

                //Create stderr pipe
                if (pipe(errPipe) == -1) {
                        die(500, "Failed to create err pipe");
                }

                //Fork process
                if ((pid = fork()) == -1) {
                        die(500, "Failed to fork");
                }

                //Child process
                if (pid == 0) {
                        //Child argv
                        char *cargv[] = { CRYPTSETUP, "-d", "-", "luksOpen", device, luks, NULL };
                        char *carge[] = { NULL };
                        //Free value
                        free(value);
                        //Redirect stdin to pipe
                        if (dup2(inPipe[0], STDIN_FILENO) == -1) {
                                die(500, "Failed to redirect in pipe");
                        }
                        //Close inPipe
                        close(inPipe[0]);
                        close(inPipe[1]);
                        //Redirect stderr to pipe
                        if (dup2(errPipe[1], STDERR_FILENO) == -1) {
                                die(500, "Failed to redirect err pipe");
                        }
                        //Close errPipe
                        close(errPipe[0]);
                        close(errPipe[1]);
                        //Call cryptsetup
                        if (execve(CRYPTSETUP, cargv, carge) == -1) {
                                die(500, "Failed to call cryptsetup");
                        }
                //Parent process
                } else {
                        //Free luks
                        free(luks);
                        //Free device
                        free(device);

                        //Close unused inPipe end
                        close(inPipe[0]);
                        //Close unused errPipe end
                        close(errPipe[1]);

                        //Send password on stdin anyway
                        //XXX: this fail if device is already unlocked for example
                        write(inPipe[1], value, valueLength);

                        //Free value
                        free(value);

                        //Close stdin with EOF
                        close(inPipe[1]);

                        //Wait child
                        if (waitpid(pid, &ret, 0) == -1) {
                                die(500, "Failed to wait child");
                        }

                        //Handle already unlocked device
                        if (ret == 1280) {
                                die(200, "Device already unlocked");
                        //Handle already in use device
                        } else if (ret == 5) {
                                die(500, "Device already in use");
                        //Handle invalid luks device
                        } else if (ret == 256) {
                                die(500, "Device is now a valid device");
                        //Handle no key available with this passphrase
                        } else if (ret == 512) {
                                die(500, "No slot for this value");
                        //Handle unexisting device or permission denied
                        } else if (ret == 1014) {
                                die(500, "Device doesn't exist or access denied");
                        //Unknown error
                        } else if (ret != 0) {
                                //Err length and counter
                                int errLength = 2048, e = 0;
                                //Declare err buffer
                                char *err;
                                //Buffer char
                                char c;
                                //Alloc err buffer
                                if ((err = malloc(errLength*sizeof(char))) == NULL) {
                                        die(500, "Couldn't alloc err buffer");
                                }
                                //Advance after ret code
                                e = sprintf(err, "%d:", ret);
                                //Fetch stderr and store in err buffer
                                while(read(errPipe[0], &c, 1) > 0) {
                                        //Grow buffer if we reach end
                                        if (e == errLength) {
                                                if ((err = realloc(err, (errLength+2048)*sizeof(char))) == NULL) {
                                                        die(500, "Couldn't grow err buffer");
                                                }
                                                errLength += 2048;
                                        }
                                        //Store character
                                        err[e] = c;
                                        //Pass to next
                                        e++;
                                }
                                //Terminate err buffer
                                err[e] = '\0';
                                //Realloc err buffer
                                if ((err = realloc(err, (e+1)*sizeof(char))) == NULL) {
                                        die(500, "Couldn't ungrow err buffer");
                                }
                                //Die with luks error
                                die(500, err);
                        }
                        //Close errPipe
                        close(errPipe[0]);
                }

                //Fork process
                if ((pid = fork()) == -1) {
                        die(500, "Failed to fork");
                }

                //IHttpd killing child process
                if (pid == 0) {
                        //File descriptor
                        int fd;

                        //Declare ihttpd pid
                        pid_t ihttpdPid;

                        //Close stdin
                        close(STDIN_FILENO);

                        //Disable line buffering on stdout and stderr
                        setvbuf(stdout, NULL, _IONBF, 0);
                        setvbuf(stderr, NULL, _IONBF, 0);

                        //Redirect output to log
                        if ((fd = open(IHTTPDLOG, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR)) == -1) {
                                fprintf(stderr, "Open ihttpd child log failed\n");
                        } else {
                                //Close stdout
                                close(STDOUT_FILENO);
                                //Redirect stdout on childlog
                                if (dup2(fd, STDOUT_FILENO) == -1) {
                                        fprintf(stderr, "Redirect stdout to ihttpd child log failed\n");
                                }
                                //Close stderr
                                close(STDERR_FILENO);
                                //Redirect stderr on childlog
                                if (dup2(fd, STDERR_FILENO) == -1) {
                                        fprintf(stderr, "Redirect stderr to ihttpd child log failed\n");
                                }
                                //Close childlog fd
                                close(fd);
                        }

                        //Extract ihttpd pid
                        if (extractIHttpdPid(&ihttpdPid) < 0) {
                                fprintf(stderr, "Failed to extract ihttpd pid");
                                exit(EXIT_FAILURE);
                        }

                        //Close stdout and stderr without childlog
                        if (fd == -1) {
                                close(STDOUT_FILENO);
                                close(STDERR_FILENO);
                        }

                        //Wait until get rattached to init(getppid()==1)
                        //XXX: we are really blind here
                        while(getppid() != 1) {
                                //Sleep half a second
                                if (usleep(500000) == -1 && fd != -1) {
                                        printf("Usleep failed\n");
                                }
                        }

                        //Termiate ihttpd
                        if (kill(ihttpdPid, 0) == 0 && kill(ihttpdPid, SIGTERM) == -1 && fd != -1) {
                                printf("Termiate ihttpd failed\n");
                        }

                        //Sleep half a second
                        if (usleep(500000) == -1 && fd != -1) {
                                printf("Usleep failed\n");
                        }

                        //Kill ihttpd
                        if (kill(ihttpdPid, 0) == 0 && kill(ihttpdPid, SIGKILL) == -1) {
                                printf("Kill ihttpd failed\n");
                        }

                //Parent process
                } else {

                        //Fork process
                        if ((pid = fork()) == -1) {
                                die(500, "Failed to fork");
                        }

                        //Ask password killing child process
                        //XXX: we are blind here
                        if (pid == 0) {
                                //File descriptor
                                int fd;

                                //Declare ask password pid
                                pid_t askPasswordPid;

                                //Close stdin
                                close(STDIN_FILENO);

                                //Disable line buffering on stdout and stderr
                                setvbuf(stdout, NULL, _IONBF, 0);
                                setvbuf(stderr, NULL, _IONBF, 0);

                                //Redirect output to log
                                if ((fd = open(ASKPASSWORDLOG, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR)) == -1) {
                                        fprintf(stderr, "Open ask password child log failed\n");
                                } else {
                                        //Close stdout
                                        close(STDOUT_FILENO);
                                        //Redirect stdout on childlog
                                        if (dup2(fd, STDOUT_FILENO) == -1) {
                                                fprintf(stderr, "Redirect stdout to ask password child log failed\n");
                                        }
                                        //Close stderr
                                        close(STDERR_FILENO);
                                        //Redirect stderr on childlog
                                        if (dup2(fd, STDERR_FILENO) == -1) {
                                                fprintf(stderr, "Redirect stderr to ask password child log failed\n");
                                        }
                                        //Close childlog fd
                                        close(fd);
                                }

                                //Extract ask password pid
                                if (extractAskPasswordPid(&askPasswordPid) < 0) {
                                        fprintf(stderr, "Failed to extract ask password pid");
                                        exit(EXIT_FAILURE);
                                }

                                //Close stdout and stderr without childlog
                                if (fd == -1) {
                                        close(STDOUT_FILENO);
                                        close(STDERR_FILENO);
                                }

                                //Wait until get rattached to init(getppid()==1)
                                //XXX: we are really blind here
                                while(getppid() != 1) {
                                        //Sleep half a second
                                        if (usleep(500000) == -1 && fd != -1) {
                                                printf("Usleep failed\n");
                                        }
                                }

                                //Termitate ask password
                                if (kill(askPasswordPid, 0) == 0 && kill(askPasswordPid, SIGTERM) == -1 && fd != -1) {
                                        printf("Termiate ask password failed\n");
                                }


                                //Sleep half a second
                                if (usleep(500000) == -1 && fd != -1) {
                                        printf("Usleep failed\n");
                                }

                                //Kill ask password
                                if (kill(askPasswordPid, 0) == 0 && kill(askPasswordPid, SIGKILL) == -1) {
                                        printf("Kill ask password failed\n");
                                }

                        //Parent process
                        } else {

                                //Process success
                                header(200, "text/plain");
                                printf("Sent value, boot should resume now");
                                fflush(NULL);

                        }

                }

        }

        exit(EXIT_SUCCESS);
}